Develop Reference

Android Widget with collection (ListView) not displaying items

I am trying to do a simple widget for my app, which displays data from an API on the widget using ListView, but the list is empty even tho Logs says that the data was downloaded successfully.
Blank listView is displayed with no data in it. No errors are shown. What's the cause of it?
Resources I used when tried to solve this problem:
official documentation - https://developer.android.com/guide/topics/appwidgets#collections
similar question - How to use listview in a widget?
my AppWidgetProvider
public class Widget extends AppWidgetProvider {
RemoteViews views;
void updateAppWidget(Context context, AppWidgetManager appWidgetManager,
int appWidgetId) {
CharSequence widgetText = context.getString(R.string.appwidget_text);
// Construct the RemoteViews object
views = new RemoteViews(context.getPackageName(), R.layout.my_widget);
views.setTextViewText(R.id.appwidget_text, widgetText);
// Instruct the widget manager to update the widget
appWidgetManager.updateAppWidget(appWidgetId, views);
}
#Override
public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
// There may be multiple widgets active, so update all of them
for (int appWidgetId : appWidgetIds) {
RemoteViews remoteViews = new RemoteViews(context.getPackageName(), R.layout.my_widget);
Intent intent = new Intent(context, WidgetService.class);
remoteViews.setRemoteAdapter(R.id.appwidget_list_view, intent);
appWidgetManager.updateAppWidget(appWidgetId, remoteViews);
}
}
WidgetFactory and WidgetService
public class WidgetFactory implements RemoteViewsService.RemoteViewsFactory{
final Context context;
List<SimpleCoin> list;
List<Coin> coinList;
public WidgetFactory(Context context, Intent intent) {
this.context = context;
}
#Override
public void onCreate() {
//get data from database
CoinDatabase coinDatabase = CoinDatabase.buildDatabase(context);
list = coinDatabase.coinDao().getAllSimpleCoinsNonLive();
coinList = new ArrayList<>();
}
#Override
public void onDataSetChanged() {
//based on data from database download content (JSON)
if(list != null) {
Log.d("Widget", "Coin size -> " + list.size());
StringBuilder id = new StringBuilder("id=" + list.get(0).getId());
for (int j = 0; j < list.size(); j++) {
id.append(",");
id.append(list.get(j).getId());
}
String finalUrl = URL + id.toString() + API_KEY;
Observable.fromCallable(() -> {
HttpURLConnection connection = null;
BufferedReader reader = null;
java.net.URL url1 = new URL(finalUrl);
connection = (HttpURLConnection) url1.openConnection();
connection.connect();
InputStream stream = connection.getInputStream();
reader = new BufferedReader(new InputStreamReader(stream));
StringBuilder buffer = new StringBuilder();
String line = "";
while ((line = reader.readLine()) != null) {
buffer.append(line).append("\n");
}
connection.disconnect();
reader.close();
return buffer.toString();
}).subscribeOn(Schedulers.io()).observeOn(AndroidSchedulers.mainThread()).subscribe(new Observer<String>() {
#Override
public void onSubscribe(#NonNull Disposable d) {
}
#Override
public void onNext(#NonNull String s) {
if (s != null) {
try {
//Create new coin and update list of coins
JSONObject object = new JSONObject(s);
for (int i = 0; i < list.size(); i++) {
JSONObject jsonObject = object.getJSONObject("data").getJSONObject(String.valueOf(list.get(i).getId()));
Log.d("Widget", "Coin -> " + jsonObject.getString("name") + jsonObject.getJSONObject("quote").getJSONObject("USD").getDouble("price") + jsonObject.getJSONObject("quote").getJSONObject("USD").getDouble("percent_change_7d"));
Coin coin = new Coin(jsonObject.getString("name"), jsonObject.getJSONObject("quote").getJSONObject("USD").getDouble("price"), jsonObject.getJSONObject("quote").getJSONObject("USD").getDouble("percent_change_7d"), false);
coinList.add(coin);
getViewAt(i);
}
} catch (JSONException e) {
Log.d("Widget", "Coin -> " + e.toString());
e.printStackTrace();
}
}
}
#Override
public void onError(#NonNull Throwable e) {
}
#Override
public void onComplete() {
}
});
}
}
#Override
public void onDestroy() {}
#Override
public int getCount() {
return list.size();
}
#Override
public RemoteViews getViewAt(int i) {
//Set ListData based on coinList
Log.d("Widget", "Coin size getViewAt -> " + list.size() + "item num ->" + i);
RemoteViews remoteViews = new RemoteViews(context.getPackageName(), R.layout.my_widget_list_item);
if(coinList != null)
if(coinList.size() > i) {
Log.d("Widget", "Coin position added" + coinList.get(i).getName());
remoteViews.setTextViewText(R.id.widgetItemTaskNameLabel, coinList.get(i).getName());
}
return remoteViews;
}
#Override
public RemoteViews getLoadingView() {
return null;
}
#Override
public int getViewTypeCount() {
return 1;
}
#Override
public long getItemId(int i) {
return i;
}
#Override
public boolean hasStableIds() {
return true;
}
}
public class WidgetService extends RemoteViewsService {
#Override
public RemoteViewsFactory onGetViewFactory(Intent intent) {
return new WidgetFactory(this.getApplicationContext(), intent);
}
}
Here are my logs:
D/Widget: Coin size getViewAt -> 1 item num ->0
D/Widget: Coin size getViewAt -> 1 item num ->0
D/Widget: Coin -> testCoin0.00.0
D/Widget: Coin size getViewAt -> 1 item num ->0
D/Widget: Coin position added testCoin
my_widget.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:tools="http://schemas.android.com/tools"
android:background="#color/colorPrimary"
android:padding="#dimen/widget_margin">
<TextView
android:id="#+id/appwidget_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_margin="8dp"
android:background="#color/colorPrimary"
android:contentDescription="#string/appwidget_text"
android:text="#string/appwidget_text"
android:textColor="#ffffff"
android:textSize="24sp"
android:textStyle="bold|italic" />
<ListView
android:id="#+id/appwidget_list_view"
android:layout_width="match_parent"
android:layout_margin="8dp"
tools:listitem="#layout/my_widget_list_item"
android:layout_height="wrap_content"
android:background="#color/colorAccent"
android:layout_below="#id/appwidget_text">
</ListView>
</RelativeLayout>
my_widget_list_item.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="match_parent"
android:paddingLeft="#dimen/widget_listview_padding_x"
android:paddingRight="#dimen/widget_listview_padding_x"
android:paddingStart="#dimen/widget_listview_padding_x"
android:paddingEnd="#dimen/widget_listview_padding_x"
android:minHeight="#dimen/widget_listview_item_height"
android:weightSum="2"
android:layout_height="wrap_content">
<TextView
android:id="#+id/widgetItemTaskNameLabel"
android:layout_width="0dp"
android:gravity="start"
android:layout_weight="1"
android:textColor="#color/colorPrimary"
android:layout_gravity="center_vertical"
android:layout_height="wrap_content" />
</LinearLayout>

I found my mistake, turns out my API call shouldn't be asynchronous because as the documentation says:
public void onDataSetChanged() ->
You can do heaving lifting in here, synchronously. For example, if you need to process an image, fetch something from the network, etc., it is ok to do it here, synchronously. The widget will remain in its current state while work is being done here, so you don't need to worry about locking up the widget.
So getting my data from Asynchronous call was the reason why data wasn't displayed

EditText cursor visible even if the EditText is not editable

I need to introduce data in an EditText but i want to use an virtual keyboard, not the android keyboard. If I use setKeyListener(null) the cursor is invisible even after using setCursorVisible(true).
Is it possible to make an EditText where even if it isn't editable the cursor is visible ?
EDIT 2 :
I found an partial method to do that, but it's not working when i'm double taping the EditText.
I made an setOnClickListner() and an setOnLongClickListner() method for the EditText. In this methods I hide the Soft Input from the Window, also i use setTextIsSelectable(false). My only problem is that when I double tap the EditText the soft input keyboard shows and I dont know how to hide it, I tried to use android:windowSoftInputMode="stateAlwaysHidden" in manifest, but it doesn't work either.
EDIT :
Here is the code that I'm using at this moment for my base converter calculator.
public class MainActivity extends AppCompatActivity {
EditText number;
EditText base;
boolean baseB = false;
String numberS = "0";
String baseS = "10";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(activity_main);
//make the EditText for number and base not editable
number = (EditText) findViewById(R.id.number);
number.setKeyListener(null);
base = (EditText) findViewById(R.id.base);
base.setKeyListener(null);
//... more code here (changing fonts for each EditText and changing status bar color
}
// I have a function for each button all are the same
public void onClickBaseChange(View v) {
if (baseB) {
baseB = false;
// i use toasts at this moment to know when i'm on number or base field
Toast.makeText(this, "Number", Toast.LENGTH_SHORT).show();
} else {
baseB = true;
Toast.makeText(this, "Base", Toast.LENGTH_SHORT).show();
}
}
public void onClickB0(View v) {
if (numberS.length() > 0 && !numberS.equals("0") && !baseB) {
numberS += "0";
number = (EditText) findViewById(R.id.number);
number.setText(numberS, TextView.BufferType.EDITABLE);
number.setSelection(numberS.length());
} else {
if (Integer.valueOf(baseS) >= 1) {
baseS += "0";
base = (EditText) findViewById(R.id.base);
base.setText(baseS, TextView.BufferType.EDITABLE);
}
}
}
public void onClickB1(View v) {
if (numberS.equals("0")) {
numberS = "1";
} else {
numberS += "1";
}
number = (EditText) findViewById(R.id.number);
number.setText(numberS, TextView.BufferType.EDITABLE);
number.requestFocus();
number.setSelection(numberS.length());
}
And the xml looks like this :
<android.widget.RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#color/colorBackground"
tools:context="manastur.calculator.MainActivity">
<EditText
android:id="#+id/base"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_marginRight="20dp"
android:layout_marginTop="120dp"
android:background="#android:color/transparent"
android:cursorVisible="true"
android:text=""
android:textColor="#color/text"
android:textSize="30dp" />
<EditText
android:id="#+id/number"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_marginLeft="30dp"
android:layout_marginTop="50dp"
android:background="#android:color/transparent"
android:cursorVisible="true"
android:text=""
android:textColor="#color/text"
android:textSize="50dp" />
<LinearLayout
android:id="#+id/secondRow"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="#+id/firstRow"
android:layout_centerHorizontal="true">
<Button
android:id="#+id/b1"
android:layout_width="85dp"
android:layout_height="85dp"
android:background="#drawable/b1"
android:onClick="onClickB1" />
<Button
android:id="#+id/b2"
android:layout_width="85dp"
android:layout_height="85dp"
android:background="#drawable/b2"
android:onClick="onClickB2" />
<!-- from this point on is the same, there are 5 LinearLayouts which
represents the 5 rows of button of the num pad -->

Use this code to achieve that,
While develop I took reference from native Dialpad code
KeypadlessKeypad.java
import android.content.Context;
import android.graphics.Rect;
import android.support.v4.view.MotionEventCompat;
import android.text.InputType;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.accessibility.AccessibilityEvent;
import android.view.inputmethod.InputMethodManager;
import android.widget.EditText;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
public class KeypadlessKeypad extends EditText {
private static final Method mShowSoftInputOnFocus = getSetShowSoftInputOnFocusMethod(
EditText.class, "setShowSoftInputOnFocus", boolean.class);
public static Method getSetShowSoftInputOnFocusMethod(Class<?> cls, String methodName, Class<?>... parametersType) {
Class<?> sCls = cls.getSuperclass();
while (sCls != Object.class) {
try {
return sCls.getDeclaredMethod(methodName, parametersType);
} catch (NoSuchMethodException e) {
// Just super it again
}
sCls = sCls.getSuperclass();
}
return null;
}
private Context mContext;
/**
* Listener for Copy, Cut and Paste event
* Currently callback only for Paste event is implemented
*/
private OnEditTextActionListener mOnEditTextActionListener;
public KeypadlessKeypad(Context context) {
super(context);
mContext = context;
init();
}
public KeypadlessKeypad(Context context, AttributeSet attrs) {
super(context, attrs);
mContext = context;
init();
}
public KeypadlessKeypad(Context context, AttributeSet attrs,
int defStyle) {
super(context, attrs, defStyle);
mContext = context;
init();
}
#Override
protected void onSelectionChanged(int selStart, int selEnd) {
super.onSelectionChanged(selStart, selEnd);
}
public final void appendText(CharSequence text) {
append(text, 0, text.length());
}
/***
* Initialize all the necessary components of TextView.
*/
private void init() {
setSingleLine(true);
synchronized (this) {
setInputType(getInputType() | InputType.TYPE_TEXT_FLAG_NO_SUGGESTIONS);
setFocusableInTouchMode(true);
}
reflexSetShowSoftInputOnFocus(false); // Workaround.
// Ensure that cursor is at the end of the input box when initialized. Without this, the
// cursor may be at index 0 when there is text added via layout XML.
setSelection(getText().length());
}
#Override
protected void onFocusChanged(boolean focused, int direction, Rect previouslyFocusedRect) {
super.onFocusChanged(focused, direction, previouslyFocusedRect);
hideKeyboard();
}
#Override
public boolean onTouchEvent(MotionEvent event) {
final boolean ret = super.onTouchEvent(event);
// Must be done after super.onTouchEvent()
hideKeyboard();
return ret;
}
private void hideKeyboard() {
final InputMethodManager imm = ((InputMethodManager) getContext()
.getSystemService(Context.INPUT_METHOD_SERVICE));
if (imm != null && imm.isActive(this)) {
imm.hideSoftInputFromWindow(getApplicationWindowToken(), 0);
}
}
private void reflexSetShowSoftInputOnFocus(boolean show) {
if (mShowSoftInputOnFocus != null) {
invokeMethod(mShowSoftInputOnFocus, this, show);
} else {
// Use fallback method. Not tested.
hideKeyboard();
}
}
public static Object invokeMethod(Method method, Object receiver, Object... args) {
try {
return method.invoke(receiver, args);
} catch (IllegalArgumentException e) {
} catch (IllegalAccessException e) {
} catch (InvocationTargetException e) {
}
return null;
}
#Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int textViewWidth = View.MeasureSpec.getSize(widthMeasureSpec);
int height = getMeasuredHeight();
this.setMeasuredDimension(textViewWidth, height);
}
#Override
protected void onTextChanged(CharSequence text, int start, int before,
int after) {
super.onTextChanged(text, start, before, after);
}
#Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
}
#Override
public boolean onTextContextMenuItem(int id) {
boolean consumed = super.onTextContextMenuItem(id);
switch (id) {
case android.R.id.paste:
if (mOnEditTextActionListener != null) {
mOnEditTextActionListener.onPaste();
}
break;
}
return consumed;
}
/**
* Setter method for {#link #mOnEditTextActionListener}
*
* #param onEditTextActionListener
* Instance of the {#link OnEditTextActionListener}
*/
public void setOnEditTextActionListener(OnEditTextActionListener onEditTextActionListener) {
this.mOnEditTextActionListener = onEditTextActionListener;
}
private Rect mRect = new Rect();
#Override
public boolean dispatchTouchEvent(MotionEvent event) {
final int action = MotionEventCompat.getActionMasked(event);
int[] location = new int[2];
getLocationOnScreen(location);
mRect.left = location[0];
mRect.top = location[1];
mRect.right = location[0] + getWidth();
mRect.bottom = location[1] + getHeight();
int x = (int) event.getX();
int y = (int) event.getY();
if (action == MotionEvent.ACTION_DOWN && !mRect.contains(x, y)) {
InputMethodManager input = (InputMethodManager) mContext.getSystemService(Context.INPUT_METHOD_SERVICE);
input.hideSoftInputFromWindow(getWindowToken(), 0);
}
return super.dispatchTouchEvent(event);
}
#Override
public void sendAccessibilityEventUnchecked(AccessibilityEvent event) {
if (event.getEventType() == AccessibilityEvent.TYPE_VIEW_TEXT_CHANGED) {
// Since we're replacing the text every time we add or remove a
// character, only read the difference. (issue 5337550)
final int added = event.getAddedCount();
final int removed = event.getRemovedCount();
final int length = event.getBeforeText().length();
if (added > removed) {
event.setRemovedCount(0);
event.setAddedCount(1);
event.setFromIndex(length);
} else if (removed > added) {
event.setRemovedCount(1);
event.setAddedCount(0);
event.setFromIndex(length - 1);
} else {
return;
}
} else if (event.getEventType() == AccessibilityEvent.TYPE_VIEW_FOCUSED) {
// The parent EditText class lets tts read "edit box" when this View has a focus, which
// confuses users on app launch (issue 5275935).
return;
}
super.sendAccessibilityEventUnchecked(event);
}
/**
* Interface to get callback from the Edittext copy, cut and paste event
* For time being only the Paste Event callback is generated
*/
public interface OnEditTextActionListener {
/**
* If Edittext get paste event then this method will be called
*/
void onPaste();
}
}
In your xml you can give like this,
<[package name].KeypadlessKeypad
android:id="#+id/dialnumbertv"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#00000000"
android:cursorVisible="false"
android:ellipsize="start"
android:gravity="center"
android:inputType="phone"
android:singleLine="true"
android:textIsSelectable="true"
android:textSize="30sp"
android:textStyle="italic"
android:visibility="visible"/>
And in your fragment you can implement like this,
public void onViewCreated(final View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
mDialNumbertv = view.findViewById(R.id.dialnumbertv);
mDialNumbertv.setCursorVisible(false);
mDialNumbertv.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (!isDigitsEmpty()) {
mDialNumbertv.setCursorVisible(true);
}
}
});
mDialNumbertv.addTextChangedListener(new TextWatcher() {
#Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
#Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
#Override
public void afterTextChanged(Editable s) {
if (isDigitsEmpty()) {
mDialNumbertv.setCursorVisible(false);
}
// updateDeleteButton();
}
});
mDialNumbertv.setOnLongClickListener(new View.OnLongClickListener() {
#Override
public boolean onLongClick(View v) {
// Ref https://android.googlesource.com/platform/packages/apps/Contacts/+/39948dc7e34dc2041b801058dada28fedb80c388/src/com/android/contacts/dialpad/DialpadFragment.java
// Right now EditText does not show the "paste" option when cursor is not visible.
// To show that, make the cursor visible, and return false, letting the EditText
// show the option by itself.
mDialNumbertv.setCursorVisible(true);
return false;
}
});
mDialNumbertv.setOnEditTextActionListener(
new KeypadlessKeypad.OnEditTextActionListener() {
#Override
public void onPaste() {
// If some content pasted on mDialNumbertv
// we need to run some search on Contact and Price
String mobileNumber = mDialNumbertv.getText().toString();
if (TextUtils.isEmpty(mobileNumber)) {
return;
}
// updateContactName(mobileNumber);
}
});
}
private KeypadlessKeypad mDialNumbertv;
private boolean isDigitsEmpty() {
return mDialNumbertv.length() == 0;
}
private void setClickedDigit(final String digitToSet) {
if (!TextUtils.isEmpty(digitToSet)) {
char digit = digitToSet.charAt(0);
String mobileNumber = mDialNumbertv.getText() + digitToSet;
mDialNumbertv.getText().insert(mDialNumbertv.getSelectionStart(), digitToSet);
// If the cursor is at the end of the text we hide it.
final int length = mDialNumbertv.length();
if (length == mDialNumbertv.getSelectionStart() && length == mDialNumbertv.getSelectionEnd()) {
mDialNumbertv.setCursorVisible(false);
}
}
}

I wanted the same behavior which I achieved as follows -
Make a custom class that will override 2 methods of AppCompatEditText.
class CustomEditText(context: Context?, attrs: AttributeSet) : AppCompatEditText(context, attrs) {
override fun onCheckIsTextEditor(): Boolean {
return true
}
override fun isTextSelectable(): Boolean {
return true
}
}
In the XML file, create EditText using this custom view.
<com.ui.custom.CustomEditText
android:id="#+id/et_email"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="none"
android:focusable="true"
android:gravity="center"
android:focusableInTouchMode="true"/>
Now, just add onFocusChangeListener and set editText.setKeyListener = null.
binding.etEmail.onFocusChangeListener = OnFocusChangeListener { v, hasFocus ->
if (hasFocus) {
binding.etEmail.keyListener = null
}
}
You can add the same on onTouch if that is the requirement.
The main issue here is that onCheckIsTextEditor() of View class always returns false, which leads to cursor never blinking or being visible even if setCursorVisible(true) was called in code.
I hope it helps.

You can use edittext.setselection(0)
or
maybe you can request focus using requestfocus()

ListView onScroll add more items

private class getArticles extends AsyncTask<Void, Void, Void> {
String url;
getArticles(String paramUrl) {
this.url = paramUrl;
}
#Override
protected void onPreExecute() {
super.onPreExecute();
mProgressDialog = new ProgressDialog(App.this);
mProgressDialog.setMessage("Učitavanje artikala...");
mProgressDialog.setIndeterminate(false);
mProgressDialog.setCancelable(false);
mProgressDialog.show();
}
#Override
protected Void doInBackground(Void... params) {
arraylist = new ArrayList<>();
try {
Document document = Jsoup.connect(url).get();
Elements els = document.select("ul.category3 > li");
for (Element el : els) {
HashMap<String, String> map = new HashMap<>();
Elements slika = el.select("div.category3-image > a > img");
Elements naslov = el.select("div.category3-text > a.main-headline");
Element datum_noformat = el.select("div.category3-text > div.headlines-info > ul.headlines-info > li").first();
Element datum = datum_noformat.html(datum_noformat.html().replaceAll("Posted ", ""));
Elements desc = el.select("div.category3-text > p");
Elements link = el.select("div.category3-text > a.main-headline");
Element br_kom = el.select("div.category3-text > div.headlines-info > ul.headlines-info > li.comments-icon").first();
map.put("naslov", naslov.text());
map.put("datum", datum.text());
map.put("desc", desc.text());
map.put("ikona", slika.attr("src"));
map.put("link", link.attr("abs:href"));
map.put("brkom", br_kom.text());
arraylist.add(map);
}
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(Void result) {
listview = (ListView) findViewById(R.id.listview);
adapter = new ArtikliAdapter(App.this, arraylist);
listview.setAdapter(adapter);
mProgressDialog.dismiss();
}
I searched for a lot of codes for onlistview scrolling, but didn't know how to implement it. The problem is, when I call my asynctask, I have an url param,
like new getArticles("http://example.com").execute();
I want to implement an onscrolllistener, but it goes like this, my param is usually set to: http://www.example.com/category/categoryname/, so the second page goes like http://www.example.com/category/categoryname/page/2/, the third one goes http://www.example.com/category/categoryname/page/3/ and so on. Each page has got 7 items that need to be parsed.
How could I implement onscrolllistener, because of the url param?
Thanks in advance.

Base on this link, I have written following solution to add elements ( 30 elements at a time, i.e page size = 30) to listview asynchronously.
Create a class named EndlessListView as follows:
public class EndlessListView extends ListView implements OnScrollListener {
private View footer;
private boolean isLoading;
private EndlessListener listener;// listner
private EndlessAdapter endlessAdapter;// adapter.
private int maxNoOfElement;
public EndlessListView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
this.setOnScrollListener(this);
}
public EndlessListView(Context context, AttributeSet attrs) {
super(context, attrs);
this.setOnScrollListener(this);
}
public EndlessListView(Context context) {
super(context);
this.setOnScrollListener(this);
}
public void setListener(EndlessListener listener) {
this.listener = listener;
}
#Override
public void onScroll(AbsListView view, int firstVisibleItem,
int visibleItemCount, int totalItemCount) {
if (getAdapter() == null)
return;
if (getAdapter().getCount() == 0 || getAdapter().getCount() <= 5)
return;
int l = visibleItemCount + firstVisibleItem;
if (l >= totalItemCount && !isLoading) {
// It is time to add new data. We call the listener
Log.e("LOAD", "DATA");
isLoading = true;
listener.loadData();
}
}
public void setMaxElemnt(int maxNoOfElement) {
this.maxNoOfElement = maxNoOfElement;
}
#Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
}
public void setLoadingView(int resId) {
LayoutInflater inflater = (LayoutInflater) super.getContext()
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
footer = (View) inflater.inflate(resId, null);
this.addFooterView(footer);
}
public void setAdapter(EndlessAdapter adapter) {
super.setAdapter(adapter);
this.endlessAdapter = adapter;
}
public void addNewData(List<Integer> data) {
endlessAdapter.setData(data);
endlessAdapter.notifyDataSetChanged();
isLoading = false;
}
public static interface EndlessListener {
public void loadData();
}
}
After this we have to create the adapter for it,called
EndlessAdapter
public class EndlessAdapter extends BaseAdapter {
private List<Integer> mIntegers;
private Context context;
public EndlessAdapter(Context context) {
this.context = context;
}
public void setData(List<Integer> mIntegers) {
this.mIntegers = mIntegers;
}
#Override
public int getCount() {
if (mIntegers == null)
return 0;
return mIntegers.size();
}
#Override
public Integer getItem(int index) {
if (mIntegers == null) {
return null;
} else {
return mIntegers.get(index);
}
}
#Override
public long getItemId(int arg0) {
// TODO Auto-generated method stub
return 0;
}
class ViewHolder {
TextView textView;
}
#Override
public View getView(int index, View view, ViewGroup viewGroup) {
ViewHolder holder;
if (view == null) {
holder = new ViewHolder();
view = ((LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE))
.inflate(R.layout.rows, viewGroup, false);
holder.textView = (TextView) view.findViewById(R.id.mtext);
view.setTag(holder);
} else {
holder = (ViewHolder) view.getTag();
}
holder.textView.setText(getItem(index) + "");
return view;
}
}
Now in xml of the activity we could use EndlessListView(in com.example.stackoverflow package) as follows :
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<com.example.stackoverflow.EndlessListView
android:id="#+id/endlessListView"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</RelativeLayout>
After this step we need to make following change in the MainActivity
public class MainActivity extends Activity implements EndlessListener {
private EndlessAdapter adapter;
private EndlessListView endlessListView;
private List<Integer> data;
private int gStartIndex = 30;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
endlessListView = (EndlessListView) findViewById(R.id.endlessListView);
adapter = new EndlessAdapter(this);
data = new ArrayList<Integer>();
endlessListView.setLoadingView(R.layout.footer);
// endlessListView.showFooter();
endlessListView.setListener(this);
endlessListView.setAdapter(adapter);
gStartIndex = 0;
fillData(gStartIndex);
}
private void fillData(int startIndex) {
new AsyncLoadData().execute(startIndex);
}
#Override
public void loadData() {
fillData(gStartIndex);
}
private class AsyncLoadData extends AsyncTask<Integer, Integer, Void> {
#Override
protected Void doInBackground(Integer... params) {
int gendIndex = params[0] + 30;
gStartIndex = gendIndex;
/***
* Here you could add your n/w code. To simulate the n/w comm. i am
* adding elements to list and making it sleep for few sec.
* */
for (int i = params[0]; i < gendIndex; i++) {
publishProgress(i);
}
try {
Thread.sleep(3000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
#Override
protected void onProgressUpdate(Integer... values) {
super.onProgressUpdate(values);
data.add(values[0]);
}
#Override
protected void onPostExecute(Void result) {
endlessListView.addNewData(data);
}
}
}

This custom ScrollListView that I just found has OnBottomReachedListener which you can implement from your Activity or Fragment and receive events when user hits the bottom of the page. You would also need to track the current page and when bottom is hit to download the next page. The latest data should be added to your existing ArrayList and you should call notifyDataSetChanged() on your adapter so ListView can render the new data. You don't have to create new adapter, you just need to update the data source which is your ArrayList.
If you support orientation change you would must to save in onSaveInstanceState() your current page number so when Activity or Fragment is recreated it can continue from correct page. And you would have to keep the ArrayList data source safe of configuration changes because you don't want to downloaded it again. I would suggest using the Fragment with setRetainInstance() set to true to persist ArrayList.
Here is my custom code for keeping data around using RetainFragment:
/**
* A simple non-UI Fragment that stores a single Object
* and is retained over configuration changes.
*/
public class RetainFragment<E extends Object> extends Fragment {
/** Object for retaining. */
private E mObject;
/**
* Empty constructor as per the Fragment documentation
*/
public RetainFragment() {}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Make sure this Fragment is retained over a configuration change
setRetainInstance(true);
}
/**
* Store a single object in this Fragment.
*
* #param object The object to store
*/
public void setObject(E object) {
mObject = object;
}
/**
* Get the stored object.
*
* #return The stored object
*/
public E getObject() {
return mObject;
}
}
Example of RetainFragment usage in your Activity:
FragmentManager fm = getFragmentManager();
mRetainFragment = (RetainFragment<ArrayList>) fm.findFragmentByTag(RETAIN_FRAG);
if (mRetainFragment == null) {
mRetainFragment = new RetainFragment<>();
mRetainFragment.setObject(new ArrayList());
fm.beginTransaction().add(mRetainFragment, RETAIN_FRAG).commit();
}
ArrayList yourArrayList = mRetainFragment.getObject();
// Now your ArrayList is saved accrossed configuration changes

here what you want fist add onscrolllistner to listview
boolean loading_flage = false;
yourlistview.setOnScrollListener(new OnScrollListener() {
#Override
public void onScrollStateChanged(
AbsListView view,
int scrollState) {
// TODO Auto-generated method stub
}
#Override
public void onScroll(AbsListView view,
int firstVisibleItem,
int visibleItemCount,
int totalItemCount) {
final int lastItem = firstVisibleItem
+ visibleItemCount;
if ((lastItem == totalItemCount)
& loading_flage == false) {
//this to prevent the list to make more than one request in time
loading_flage = true;
//you can put the index for your next page here
loadMore(int page);
}
}
});
and then in loading more after loading the page set the loading with false and parse the data add it to the data that you aleardy have
//notify the adapter
adapter.notifyDataSetChanged();
loading_flage = false;

You can achieve by adding the scrolllistener on listview and check condition if list last visible item is last in ArrayList then call the asynctask with incremented page number and update the listview,mean while add the view on listview and after getting the result from server remove the loading more view from the listview like this -
AndroidListViewLoadMoreActivity.java
public class AndroidListViewLoadMoreActivity extends Activity {
ArrayList<Country> countryList;
MyCustomAdapter dataAdapter = null;
int page = 0;
boolean loadingMore = false;
View loadMoreView;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
ListView listView = (ListView) findViewById(R.id.listView1);
loadMoreView = ((LayoutInflater)this
.getSystemService(Context.LAYOUT_INFLATER_SERVICE))
.inflate(R.layout.loadmore, null, false);
listView.addFooterView(loadMoreView);
//create an ArrayAdaptar from the String Array
countryList = new ArrayList<Country>();
dataAdapter = new MyCustomAdapter(this,
R.layout.country_info, countryList);
listView.setAdapter(dataAdapter);
//enables filtering for the contents of the given ListView
listView.setTextFilterEnabled(true);
listView.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// When clicked, show a toast with the TextView text
Country country = (Country) parent.getItemAtPosition(position);
Toast.makeText(getApplicationContext(),
country.getCode(), Toast.LENGTH_SHORT).show();
}
});
listView.setOnScrollListener(new OnScrollListener(){
#Override
public void onScrollStateChanged(AbsListView view, int scrollState) {}
#Override
public void onScroll(AbsListView view, int firstVisibleItem,
int visibleItemCount, int totalItemCount) {
int lastInScreen = firstVisibleItem + visibleItemCount;
if((lastInScreen == totalItemCount) && !(loadingMore)){
String url = "http://10.0.2.2:8080/CountryWebService" +
"/CountryServlet";
grabURL(url);
}
}
});
String url = "http://example.com";
grabURL(url);
}
public void grabURL(String url) {
Log.v("Android Spinner JSON Data Activity", url);
new GrabURL().execute(url);
}
private class GrabURL extends AsyncTask<String, Void, String> {
private static final int REGISTRATION_TIMEOUT = 3 * 1000;
private static final int WAIT_TIMEOUT = 30 * 1000;
private final HttpClient httpclient = new DefaultHttpClient();
final HttpParams params = httpclient.getParams();
HttpResponse response;
private String content = null;
private boolean error = false;
private ProgressDialog dialog =
new ProgressDialog(AndroidListViewLoadMoreActivity.this);
protected void onPreExecute() {
dialog.setMessage("Getting your data... Please wait...");
dialog.show();
}
protected String doInBackground(String... urls) {
String URL = null;
loadingMore = true;
try {
URL = urls[0];
HttpConnectionParams.setConnectionTimeout(params, REGISTRATION_TIMEOUT);
HttpConnectionParams.setSoTimeout(params, WAIT_TIMEOUT);
ConnManagerParams.setTimeout(params, WAIT_TIMEOUT);
HttpPost httpPost = new HttpPost(URL);
//add name value pair for the country code
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
nameValuePairs.add(new BasicNameValuePair("page",String.valueOf(page)));
httpPost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
response = httpclient.execute(httpPost);
StatusLine statusLine = response.getStatusLine();
if(statusLine.getStatusCode() == HttpStatus.SC_OK){
ByteArrayOutputStream out = new ByteArrayOutputStream();
response.getEntity().writeTo(out);
out.close();
content = out.toString();
} else{
//Closes the connection.
Log.w("HTTP1:",statusLine.getReasonPhrase());
response.getEntity().getContent().close();
throw new IOException(statusLine.getReasonPhrase());
}
} catch (ClientProtocolException e) {
Log.w("HTTP2:",e );
content = e.getMessage();
error = true;
cancel(true);
} catch (IOException e) {
Log.w("HTTP3:",e );
content = e.getMessage();
error = true;
cancel(true);
}catch (Exception e) {
Log.w("HTTP4:",e );
content = e.getMessage();
error = true;
cancel(true);
}
return content;
}
protected void onCancelled() {
dialog.dismiss();
Toast toast = Toast.makeText(AndroidListViewLoadMoreActivity.this,
"Error connecting to Server", Toast.LENGTH_LONG);
toast.setGravity(Gravity.TOP, 25, 400);
toast.show();
}
protected void onPostExecute(String content) {
dialog.dismiss();
Toast toast;
if (error) {
toast = Toast.makeText(AndroidListViewLoadMoreActivity.this,
content, Toast.LENGTH_LONG);
toast.setGravity(Gravity.TOP, 25, 400);
toast.show();
} else {
displayCountryList(content);
}
}
}
private void displayCountryList(String response){
JSONObject responseObj = null;
try {
Gson gson = new Gson();
responseObj = new JSONObject(response);
JSONArray countryListObj = responseObj.getJSONArray("countryList");
//countryList = new ArrayList<Country>();
if(countryListObj.length() == 0){
ListView listView = (ListView) findViewById(R.id.listView1);
listView.removeFooterView(loadMoreView);
}
else {
for (int i=0; i<countryListObj.length(); i++){
//get the country information JSON object
String countryInfo = countryListObj.getJSONObject(i).toString();
//create java object from the JSON object
Country country = gson.fromJson(countryInfo, Country.class);
//add to country array list
countryList.add(country);
dataAdapter.add(country);
}
page++;
dataAdapter.notifyDataSetChanged();
loadingMore = false;
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}
Make MyCustomAdapter.java as adapter
private class MyCustomAdapter extends ArrayAdapter<Country> {
private ArrayList<Country> countryList;
public MyCustomAdapter(Context context, int textViewResourceId,
ArrayList<Country> countryList) {
super(context, textViewResourceId, countryList);
this.countryList = new ArrayList<Country>();
this.countryList.addAll(countryList);
}
private class ViewHolder {
TextView code;
TextView name;
TextView continent;
TextView region;
}
public void add(Country country){
Log.v("AddView", country.getCode());
this.countryList.add(country);
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
Log.v("ConvertView", String.valueOf(position));
if (convertView == null) {
LayoutInflater vi = (LayoutInflater)getSystemService(
Context.LAYOUT_INFLATER_SERVICE);
convertView = vi.inflate(R.layout.country_info, null);
holder = new ViewHolder();
holder.code = (TextView) convertView.findViewById(R.id.code);
holder.name = (TextView) convertView.findViewById(R.id.name);
holder.continent = (TextView) convertView.findViewById(R.id.continent);
holder.region = (TextView) convertView.findViewById(R.id.region);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
Country country = this.countryList.get(position);
holder.code.setText(country.getCode());
holder.name.setText(country.getName());
holder.continent.setText(country.getContinent());
holder.region.setText(country.getRegion());
return convertView;
}
}
}
Create Country.Java as pojo -
public class Country {
String code = null;
String name = null;
String continent = null;
String region = null;
Double lifeExpectancy = null;
Double gnp = null;
Double surfaceArea = null;
int population = 0;
public String getCode() {
return code;
}
public void setCode(String code) {
this.code = code;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getContinent() {
return continent;
}
public void setContinent(String continent) {
this.continent = continent;
}
public String getRegion() {
return region;
}
public void setRegion(String region) {
this.region = region;
}
public Double getLifeExpectancy() {
return lifeExpectancy;
}
public void setLifeExpectancy(Double lifeExpectancy) {
this.lifeExpectancy = lifeExpectancy;
}
public Double getGnp() {
return gnp;
}
public void setGnp(Double gnp) {
this.gnp = gnp;
}
public Double getSurfaceArea() {
return surfaceArea;
}
public void setSurfaceArea(Double surfaceArea) {
this.surfaceArea = surfaceArea;
}
public int getPopulation() {
return population;
}
public void setPopulation(int population) {
this.population = population;
}
}
Create main.xml for main layout
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent" android:layout_height="fill_parent"
android:orientation="vertical">
<TextView android:layout_width="fill_parent"
android:layout_height="wrap_content" android:padding="10dp"
android:text="#string/some_text" android:textSize="20sp" />
<ListView android:id="#+id/listView1" android:layout_width="fill_parent"
android:layout_height="fill_parent" />
</LinearLayout>
Create country_info.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:padding="6dip" >
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:text="Code: "
android:textAppearance="?android:attr/textAppearanceMedium" />
<TextView
android:id="#+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/textView1"
android:layout_below="#+id/textView1"
android:text="Name: "
android:textAppearance="?android:attr/textAppearanceMedium" />
<TextView
android:id="#+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/textView2"
android:layout_below="#+id/textView2"
android:text="Continent: "
android:textAppearance="?android:attr/textAppearanceMedium" />
<TextView
android:id="#+id/textView4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/textView3"
android:layout_below="#+id/textView3"
android:text="Region: "
android:textAppearance="?android:attr/textAppearanceMedium" />
<TextView
android:id="#+id/continent"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="#+id/textView3"
android:layout_alignBottom="#+id/textView3"
android:layout_toRightOf="#+id/textView3"
android:text="TextView" />
<TextView
android:id="#+id/region"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="#+id/textView4"
android:layout_alignBottom="#+id/textView4"
android:layout_alignLeft="#+id/continent"
android:text="TextView" />
<TextView
android:id="#+id/name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="#+id/textView3"
android:layout_toRightOf="#+id/textView3"
android:text="TextView" />
<TextView
android:id="#+id/code"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="#+id/textView2"
android:layout_alignLeft="#+id/name"
android:text="TextView" />
</RelativeLayout>
Footer View Text - loadmore.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="fill_parent"
android:gravity="center_horizontal"
android:padding="3dp"
android:layout_height="fill_parent">
<TextView
android:id="#id/android:empty"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:gravity="center"
android:padding="5dp"
android:text="Loading more data..."/>
</LinearLayout>
Don't forget to mention internet permission with -
<uses-permission android:name="android.permission.INTERNET" />

First, you need a OnScrollListener method like this:
private OnScrollListener onScrollListener() {
return new OnScrollListener() {
#Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
int threshold = 1;
int count = listView.getCount();
if (scrollState == SCROLL_STATE_IDLE) {
if (listView.getLastVisiblePosition() >= count - threshold && pageCount < 2) {
Log.i(TAG, "loading more data");
// Execute LoadMoreDataTask AsyncTask
//It reached ListView bottom
getDataFromUrl(url_page2);
}
}
}
#Override
public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount,
int totalItemCount) {
}
};
}
set List View scroll listener by listView.setOnScrollListener(onScrollListener());
I have a full tutorial post HERE! You can visit it!

ArrayAdapter never used ArrayList null and all items appear in single row

I am new to android and I am trying to create a list view using an array adapter, a run method and multi threading. The list displays all the data from an array list as a single row.
My MainActivity looks like this:
public class MainActivity extends FragmentActivity implements OnClickListener{
..
ArrayList<StorylineData> storylineData;
ArrayList<SummaryData> summary;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mSpinnerAPI = (Spinner) findViewById(R.id.spinnerAPI);
mButtonSubmit = (Button) findViewById(R.id.buttonSubmit);
mEditTextResponse = (ListView) findViewById(R.id.editResponse);
mProgressRequest = (ProgressBar) findViewById(R.id.progressRequest);
mButtonSubmit.setOnClickListener(this);
...
#Override
public void onClick(View v) {
toggleProgress(true);
switch (mSpinnerAPI.getSelectedItemPosition()) {
case 0: // Authenticate
...
case 4: // Get Summary Day
MovesAPI.getSummary_SingleDay(summaryHandler, "20150418", null);//Date changed to "20150117"
break;
...
case 10: // Get Storyline Day
MovesAPI.getStoryline_SingleDay(storylineHandler, "20150418", "20140714T073812Z", false);//Date changed to "20150418" "null changed to"20140714T073812Z"
break;
...
toggleProgress(false);
break;
}
}
...
private MovesHandler<ArrayList<StorylineData>> storylineHandler = new MovesHandler<ArrayList<StorylineData>>() {
#Override
public void onSuccess(ArrayList<StorylineData> result) {
toggleProgress(false);
updateResponse(
"Date:\t" + result.get(0).getDate() + "\n"
+ "-----------Activity 1 Summary--------\t" + "\n"
+ "Activity:\t" + result.get(0).getActivity().toString() + "\n"//returns 1587 with .getCaloriesIdle()
...
+ "-----------Activity 2 Summary---------\t" + "\n"
+ "Activity:\t" + result.get(0).getSummary().get(0).getActivity() + "\n"//returns 1587 with .getCaloriesIdle()
...
+ "-----------Segments---------\t" + "\n"
+ "Type:\t" + result.get(0).getSegments().get(0).getType() + "\n"//returns 1587 with .getCaloriesIdle()
...
}
public void updateResponse(final String message) {
MainActivity.this.runOnUiThread(new Runnable() {
#Override
public void run() {
mButtonSubmit.setText(message);
StorylineAdapter adapter = new StorylineAdapter(MainActivity.this, R.layout.item_storyline, storylineData);
mEditTextResponse.setAdapter(adapter);
}
});
}
}
My ArrayAdapter class looks like this:
public class StorylineAdapter extends ArrayAdapter<SummaryData>{
private Context context;
private Runnable runnable;
private ArrayList<StorylineData> storylineData;
public StorylineAdapter(Context context, int resource, ArrayList<SummaryData> objects) {
super(context, resource, objects);
this.context = context;
this.runnable = runnable;
this.summary = objects;
}
#Override
public View getView(int position, View convertView, ViewGroup parent){
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
View view = inflater.inflate(R.layout.item_storyline, parent, false);
//Display in the TextView widget
SummaryData summary1 = summary.get(position);
TextView tv = (TextView) view.findViewById(R.id.textView1);
tv.setText(summary1.getActivity());
return view;
}
}
Here is my parser class:
public class StorylineData extends ArrayList<StorylineData> {
...Getters/Setters...
/**
* Parse a {#link org.json.JSONObject} from storyline {#link org.json.JSONArray}, then return the corresponding {#link StorylineData} object.
*
* #param jsonObject : the storyline JSON object received from server
* #return corresponding {#link StorylineData}
*/
public static StorylineData parse(JSONObject jsonObject) throws JSONException {
if (jsonObject != null) {
StorylineData storylineData = new StorylineData();
storylineData.date = jsonObject.optString("date");
storylineData.caloriesIdle = jsonObject.optInt("caloriesIdle");
storylineData.lastUpdate = jsonObject.optString("lastUpdate");
storylineData.summary = new ArrayList<SummaryData>();
storylineData.segments = new ArrayList<SegmentData>();
/**Get the data associated with the array named summary **To get a specific JSONArray: Summary*/
JSONArray summariesJsonArray = jsonObject.optJSONArray("summary");
if (summariesJsonArray != null)
for (int i = 0; i < summariesJsonArray.length(); i++) {
/**each time through array will need to get a reference of current object*/
JSONObject summaryJsonObject = summariesJsonArray.optJSONObject(i);
if (summaryJsonObject != null) {
/**===============Translate data from json to Java=================*/
/**Create a new OBJECT OF ARRAY STORYLINE/SUMMARY*/
ArrayList<SummaryData> summary = new ArrayList<SummaryData>(); // initialisation must be outside the loop
storylineData.setSummary(summary);
/**Get summary from json into java*/
summariesJsonArray.getJSONObject(i).getString("distance");
/**Get date from json into java*/
String date = summaryJsonObject.optString("date");
storylineData.setDate(date);
/**Get group from json into java*/
String group = summaryJsonObject.optString("group");//Get name using key e.g. date
storylineData.setGroup(group);
...
storylineData.summary.add(SummaryData.parse(summaryJsonObject));
Log.d("StorylineDataCls \t sJo", summaryJsonObject.toString() + "Log\n");
System.out.println("print distance" + summariesJsonArray.getJSONObject(i).getString("distance"));
System.out.println("print summary" + summaryJsonObject);
}
}
JSONArray segmentsJsonArray = jsonObject.optJSONArray("segments");
if (segmentsJsonArray != null) {
for (int i = 0; i < segmentsJsonArray.length(); i++) {
JSONObject segment = segmentsJsonArray.optJSONObject(i);
if (segment != null) {
ArrayList<SegmentData> segments = new ArrayList<SegmentData>(); // initialisation must be outside the loop
storylineData.setSegments(segments);
String type = segment.optString("type");
storylineData.setType(type);
...
storylineData.segments.add(SegmentData.parse(segment));
Log.d("StorylineDataCls \t sSo", segment.toString());
}
}
}
return storylineData;
}
return null;
}
}
I'm wondering if the reason the items are appearing in a single row may be because of a problem in the layout files?
Main Layout.
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/layout"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<Spinner
android:id="#+id/spinnerAPI"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:entries="#array/API_Names"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
<Button
android:id="#+id/buttonSubmit"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Get Data"
android:layout_below="#+id/spinnerAPI"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
<ProgressBar
android:id="#+id/progressRequest"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:visibility="gone"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
<ListView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/editResponse"
android:layout_below="#+id/spinnerAPI"
android:layout_alignLeft="#+id/progressRequest"
android:layout_alignStart="#+id/progressRequest" />
</RelativeLayout>
Item Layout:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:layout_centerVertical="true"
android:text="#string/flower_name_placeholder"
android:textAppearance="?android:attr/textAppearanceLarge" />
</RelativeLayout>

Changed MainActivity to implement View.OnClickListener:
public class MainActivity extends FragmentActivity implements View.OnClickListener {
Removed ArrayAdapter and replaced updateResponse method with:
public void updateResponse(final String message) {
runOnUiThread(new Runnable() {
//MainActivity.this.runOnUiThread(new Runnable() {
#Override
public void run() {
ListView mListView = (ListView) findViewById(R.id.list_view);
String[] stringArray = message.split("\n");
// This is the array adapter, it takes the context of the activity as a
// first parameter, the type of list view as a second parameter and your
// array as a third parameter.
ArrayAdapter<String> adapter = new ArrayAdapter<>(MainActivity.this, android.R.layout.simple_list_item_1, stringArray);
mListView.setAdapter(adapter);
}
});
}

Replacing JSON Populated TextView with JSON Populated ListView [duplicate]

This question already has an answer here:
JSON String is incorrectly mapped to textviews
(1 answer)
Closed 9 years ago.
I have a JSON request which returns a response from youtube containing the comments for a particular video. I currently have 3 textviews: one for the name/uploader, one for the content, and one for the date published - which are then populated with the data from my JSON response.
My problem is - only the first comment, date published and uploader appear.
I belive I'll need to replace my textviews with a list view and parse the 3 fields to it - I simply do not know how.
JAVA
public class Player extends YouTubeBaseActivity implements
YouTubePlayer.OnInitializedListener {
public static final String API_KEY = "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.player);
String title = getIntent().getStringExtra("title");
String uploader = getIntent().getStringExtra("uploader");
String viewCount = getIntent().getStringExtra("viewCount");
TextView titleTv = (TextView) findViewById(R.id.titleTv);
TextView uploaderTv = (TextView) findViewById(R.id.uploaderTv);
TextView viewCountTv = (TextView) findViewById(R.id.viewCountTv);
titleTv.setText(title);
uploaderTv.setText("by" + uploader + " |");
viewCountTv.setText(viewCount + " views");
YouTubePlayerView youTubePlayerView = (YouTubePlayerView) findViewById(R.id.youtubeplayerview);
youTubePlayerView.initialize(API_KEY, this);
Handler handler = new Handler(new Handler.Callback() {
#Override
public boolean handleMessage(Message msg) {
return false;
}
});
GetYouTubeUserCommentsTask task = new GetYouTubeUserCommentsTask(handler , viewCount);
task.execute();
}
#Override
public void onInitializationFailure(Provider provider,
YouTubeInitializationResult result) {
Toast.makeText(getApplicationContext(), "onInitializationFailure()",
Toast.LENGTH_LONG).show();
}
#Override
public void onInitializationSuccess(Provider provider,
YouTubePlayer player, boolean wasRestored) {
if (!wasRestored) {
String video_id = getIntent().getStringExtra("id");
player.loadVideo(video_id);
}
}
public final class GetYouTubeUserCommentsTask extends
AsyncTask<Void, Void, Void> {
public static final String LIBRARY = "CommentsLibrary";
private final Handler replyTo;
private final String username;
String video_id = getIntent().getStringExtra("id");
public GetYouTubeUserCommentsTask(Handler replyTo, String username) {
this.replyTo = replyTo;
this.username = username;
}
#Override
protected Void doInBackground(Void... arg0) {
try {
HttpClient client = new DefaultHttpClient();
HttpUriRequest request = new HttpGet(
"http://gdata.youtube.com/feeds/api/videos/"
+ video_id
+ "/comments?v=2&alt=json&start-index=1&max-results=50&prettyprint=true");
HttpResponse response = client.execute(request);
String jsonString = StreamUtils.convertToString(response
.getEntity().getContent());
JSONObject json = new JSONObject(jsonString);
JSONArray jsonArray = json.getJSONObject("feed").getJSONArray(
"entry");
List<Comments> comments = new ArrayList<Comments>();
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject entry = jsonArray.getJSONObject(i);
JSONArray authorArray = entry.getJSONArray("author");
JSONObject publishedObject = entry.getJSONObject("published");
String published = publishedObject.getString("$t");
JSONObject contentObject = entry.getJSONObject("content");
String content = contentObject.getString("$t");
JSONObject authorObject = authorArray.getJSONObject(0);
JSONObject nameObject = authorObject.getJSONObject("name");
String name = nameObject.getString("$t");
comments.add(new Comments(name, content, published));
CommentsLibrary lib = new CommentsLibrary(published, content, name);
Bundle data = new Bundle();
data.putSerializable(LIBRARY, lib);
Message msg = Message.obtain();
msg.setData(data);
replyTo.sendMessage(msg);
}
} catch (ClientProtocolException e) {
Log.e("Feck", e);
} catch (IOException e) {
Log.e("Feck", e);
} catch (JSONException e) {
Log.e("Feck", e);
}
return null;
}
#Override
protected void onPostExecute(Void result) {
ListView comments = (ListView) findViewById(R.id.comments);
comments.setFilterText(com.idg.omv.domain.CommentsLibrary.getName());
}
}
}
CommentsLibrary
public class CommentsLibrary implements Serializable{
// The username of the owner of the comment
private static String name;
// The comment
private static String content;
// The date the comment was published
private static String published;
public CommentsLibrary(String name, String content, String published) {
this.name = name;
this.content = content;
this.published = published;
}
/**
* #return the user name
*/
public static String getName() {
return name;
}
/**
* #return the videos
*/
public static String getContent() {
return content;
}
/**
* #return the videos
*/
public static String getPublished() {
return published;
}
}
XML
<TextView
android:id="#+id/name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="left"
android:text="" />
<TextView
android:id="#+id/content"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#id/name"
android:layout_weight="1"
android:gravity="left"
android:text="" />
<TextView
android:id="#+id/published"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#id/content"
android:layout_weight="1"
android:gravity="left"
android:text="" />

Continuing my answer from your previous question # JSON String is incorrectly mapped to textviews
First you need a listview in your layout xml
<ListView
android:id="#+id/list"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
Declare list as a instance variable
ArrayList<CommentsLibrary> list = new ArrayList<CommentsLibrary>();
Then
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject jsonObject = jsonArray.getJSONObject(i);
String name = jsonObject.optString("name","defaultValue");
String content = jsonObject.optString("content","defaultValue");
String published = jsonObject.optString("published","defaultValue");
list.add(new CommentsLibrary(name, content, published));
}
Then initialize listview
ListView lv =(ListView)findViewById(R.id.list);
CustomAdapter cus = new CustomAdapter(ActivityName.this,list);
lv.setAdapter(cus);
Define a custom layout with 3 textviews. (list_item.xml)
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginLeft="18dp"
android:layout_marginTop="31dp"
android:text="TextView" />
<TextView
android:id="#+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="#+id/textView1"
android:layout_alignBottom="#+id/textView1"
android:layout_centerHorizontal="true"
android:text="TextView" />
<TextView
android:id="#+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="#+id/textView2"
android:layout_alignBottom="#+id/textView2"
android:layout_alignParentRight="true"
android:layout_marginRight="24dp"
android:text="TextView" />
</RelativeLayout>
Then define a custom adapter by extending a base adapter. Override getView inflate the custom layout and set text views there.
public class CustomAdapter extends BaseAdapter
{
LayoutInfalter mInflater;
ArrayList<CommentsLibrary> list;
public CustomAdapter(Context context,ArrayList<CommentsLibrary> list)
{
mInflater = LayoutInfalter.from(context);
this.list = list;
}
#Override
public int getCount() {
// TODO Auto-generated method stub
return list.size();
}
#Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return position;
}
#Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
ViewHolder holder;
if(convertView==null)
{
convertView =minflater.inflate(R.layout.list_item, parent,false);
holder = new ViewHolder();
holder.tv1 = (TextView) convertView.findViewById(R.id.textView1);
holder.tv2 = (TextView) convertView.findViewById(R.id.textView2);
holder.tv3 = (TextView) convertView.findViewById(R.id.textView3);
convertView.setTag(holder);
}
else
{
holder= (ViewHolder) convertView.getTag();
}
holder.tv1.setText(list.get(position).getName());
holder.tv2.setText(list.get(position).getContent());
holder.tv3.setText(list.get(position).getPublished());
return convertView;
}
static class ViewHolder
{
TextView tv1,tv2,tv3
}
}

You need to add a list view in your layout and populate it using an ArrayAdapter. Here's a tutorial that shows you how - http://www.vogella.com/articles/AndroidListView/article.html#arrayAdapter