Develop Reference

How do I set variables to true/false from a Listview of Checkboxes?

I created a listview with a custom adapter that allows me to have a list of items with checkboxes next to each item.
So I would like to look at the checkbox for the corresponding item in the list and see if it is checked and if it is, then set the value of boolean whiskey = false to true and so on for the other booleans.
It is very possible I have code in the wrong class or xml file, I've been trying to piece together things I've found on the internet. I'm new to android studio so its proving very difficult. I do have about a years worth of java experience though. I have all my code written in a working program on Eclipse, I am just having a hell of a time figuring out how to implement it into a working app.
Thanks in advance.
customAdapter.java
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.TextView;
import java.util.ArrayList;
public class customAdapter extends BaseAdapter {
private ArrayList<String> list = new ArrayList<String>();
private Context context;
public customAdapter(ArrayList<String> list, Context context) {
this.list = list;
this.context = context;
}
#Override
public int getCount() {
return list.size();
}
#Override
public Object getItem(int pos) {
return list.get(pos);
}
public void setChecked(boolean isChecked){
}
#Override
public View getView(final int position, View convertView, ViewGroup parent) {
View view = convertView;
if (view == null) {
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = inflater.inflate(R.layout.activity2_listview, null);
}
//Handle TextView and display string from your list
TextView label = (TextView)view.findViewById(R.id.label);
label.setText(list.get(position));
//Handle buttons and add onClickListeners
CheckBox callchkbox = (CheckBox) view.findViewById(R.id.cb);
callchkbox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
#Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
//update isChecked value to model class of list at current position
list.get(position).setChecked(isChecked);
}
});
return view;
}
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
Main2Activity.java
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ListView;
import java.util.ArrayList;
import java.util.Arrays;
import android.widget.CheckBox;
public class Main2Activity extends AppCompatActivity {
boolean Whiskey, Bourbon, Rum, Gin, Vodka, Tequila = false;
String [] userIngredients = {"Whiskey", "Bourbon", "Rum", "Gin", "Vodka", "Tequila", "Club Soda", "Lemon-Lime Soda",
"Ginger ale", "Cola", "Still mineral water", "Tonic Water", "Orange Juice", "Cranberry Juice", "Grapefruit Juice",
"Tomato Juice", "Cream or Half and Half", "Milk", "Ginger Beer", "PineApple Juice", "Lemons", "Limes", "Oranges"};
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main2);
ListView listView = (ListView) findViewById(R.id.userIngredients);
ArrayList<String> list = new ArrayList<String>(Arrays.asList(userIngredients));
listView.setAdapter(new customAdapter(list, Main2Activity.this));
}
}
activity_main2.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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="match_parent"
android:layout_height="match_parent"
tools:context=".Main2Activity"
android:id="#+id/linearLayout">
<ListView
android:layout_width="419dp"
android:layout_height="558dp"
android:id="#+id/userIngredients"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/textView2"
tools:layout_conversion_absoluteHeight="731dp"
tools:layout_conversion_absoluteWidth="411dp" />
<TextView
android:id="#+id/textView2"
android:layout_width="374dp"
android:layout_height="60dp"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:layout_marginTop="16dp"
android:layout_marginEnd="8dp"
android:layout_marginRight="8dp"
android:text="Check Your Ingredients"
android:textSize="24sp"
app:fontFamily="#font/cinzel"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>
activity2_listview.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:layout_height="match_parent">
<TextView
android:id="#+id/label"
android:layout_width="323dp"
android:layout_height="wrap_content"
android:layout_marginLeft="20dp"
android:text="ingredient"
android:textSize="20sp" />
<CheckBox
android:id="#+id/cb"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>

i think you can do it with a BaseAdapter as well, but i suggest to use a RecyclerView instead.
I used support-v4 and recyclerview-v7 libs as following:
(Make sure that you are not developing AndroidX - check your gradle.properties of the entire project. It is very similar but uses other libraries though.)
build.gradle
android {
compileSdkVersion 28
buildToolsVersion '28.0.3'
...
dependencies {
implementation 'com.android.support:appcompat-v7:28.0.0'
implementation 'com.android.support:support-v4:28.0.0'
implementation 'com.android.support:design:28.0.0'
implementation 'com.android.support.constraint:constraint-layout:1.1.3'
implementation 'com.android.support:recyclerview-v7:28.0.0'
...
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<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="match_parent"
android:layout_height="match_parent">
<TextView
android:id="#+id/textView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Check Your Ingredients"
android:textAlignment="center" />
<android.support.v7.widget.RecyclerView
android:id="#+id/recycler_chooser"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:scrollbars="vertical"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" >
</android.support.v7.widget.RecyclerView>
</android.widget.RelativeLayout>
In the activity2_listview you might want to do more design to the xml. It looks very basic now.
activity2_listview.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:layout_height="wrap_content">
<TextView
android:id="#+id/listviewtextlabel"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="20dp"
android:text="ingredient"
android:textSize="20sp" />
<CheckBox
android:id="#+id/listviewcheckbox"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
In the main class we implement a callback-listener for our custom onItemAction function. We pass the listener with adapter.setActionListener(this); and add the adapter to the RecyclerViewer.
MainActivity.java
public class MainActivity extends AppCompatActivity implements CustomAdapter.ItemActionListener {
boolean Whiskey, Bourbon, Rum, Gin, Vodka, Tequila = false;
String [] userIngredients = {"Whiskey", "Bourbon", "Rum", "Gin", "Vodka", "Tequila", "Club Soda", "Lemon-Lime Soda",
"Ginger ale", "Cola", "Still mineral water", "Tonic Water", "Orange Juice", "Cranberry Juice", "Grapefruit Juice",
"Tomato Juice", "Cream or Half and Half", "Milk", "Ginger Beer", "PineApple Juice", "Lemons", "Limes", "Oranges"};
CustomAdapter adapter;
RecyclerView.LayoutManager layoutManager;
RecyclerView recyclerListView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
try {
recyclerListView = (RecyclerView) findViewById(R.id.recycler_chooser);
ArrayList<String> list = new ArrayList<>();
list.addAll(Arrays.asList(userIngredients));
// use this setting to improve performance if you know that changes
// in content do not change the layout size of the RecyclerView
recyclerListView.setHasFixedSize(false);
layoutManager = new LinearLayoutManager(this);
recyclerListView.setLayoutManager(layoutManager);
System.out.println("list.size() " + list.size());
adapter = new CustomAdapter(list,MainActivity.this);
adapter.setActionListener(this);
recyclerListView.setAdapter(adapter);
} catch (Exception e){
e.printStackTrace();
}
}
// callback listener for your items
#Override
public void onItemAction(View view, CustomAdapter.CustomActions customAction, int position) {
final String itemName = adapter.getItem(position);
System.out.println(customAction + ": You clicked " + itemName + " on row number " + position);
switch(itemName){
case "Whiskey":
if(customAction== CustomAdapter.CustomActions.CHECK){
Whiskey=true;
}
else{
Whiskey=false;
}
System.out.println("Whiskey set to: " + Whiskey);
break;
case "Bourbon":
if(customAction== CustomAdapter.CustomActions.CHECK){
Bourbon=true;
}
else{
Bourbon=false;
}
System.out.println("Bourbon set to: " + Bourbon);
break;
//case xyz
// and so on
default:
System.out.println("Not programmed yet: " + itemName);
}
}
}
As said above i removed the BaseAdapter and replaced it with the RecyclerView. We had to implement a custom ViewHolder-class that contains each row in our RecyclerViewList. Within the ViewHolder we can call the method on our listener whenever a checkbox-change event occurs.
CustomAdapter.java
import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.TextView;
import java.util.ArrayList;
public class CustomAdapter extends RecyclerView.Adapter<CustomAdapter.CustomViewHolder> {
//------ helper class for the viewholder
enum CustomActions{
CHECK,UNCHECK
}
// Provide a reference to the views for each row
public class CustomViewHolder extends RecyclerView.ViewHolder {
// each data item is just a string in this case
public TextView mTextView;
public CheckBox mCheckBox;
public CustomViewHolder(View v) {
super(v);
// the view element v is the whole linear layout element
CheckBox.OnCheckedChangeListener checkboxListenerForOneEntry = new CheckBox.OnCheckedChangeListener(){
#Override
public void onCheckedChanged(CompoundButton view, boolean isChecked) {
if (mItemActionListener != null) {
if(isChecked){
// this compoundbutton view element will be the checkbox
mItemActionListener.onItemAction(view, CustomActions.CHECK, getAdapterPosition());
}else{
mItemActionListener.onItemAction(view, CustomActions.UNCHECK, getAdapterPosition());
}
}
}
};
mTextView = v.findViewById(R.id.listviewtextlabel);
mCheckBox = v.findViewById(R.id.listviewcheckbox);
mCheckBox.setOnCheckedChangeListener(checkboxListenerForOneEntry);
}
}
//------
private ArrayList<String> list;
private Context context;
private LayoutInflater mInflater;
private ItemActionListener mItemActionListener;
public CustomAdapter(ArrayList<String> list, Context context) {
this.list = list;
this.context = context;
this.mInflater = LayoutInflater.from(this.context);
}
// allows clicks events to be caught
void setActionListener(ItemActionListener itemActionListener) {
this.mItemActionListener = itemActionListener;
}
// parent activity will implement this method to respond to click events
public interface ItemActionListener {
void onItemAction(View view, CustomActions customAction, int position);
}
// Create new views (invoked by the layout manager)
#Override
public CustomViewHolder onCreateViewHolder(ViewGroup parent,
int viewType) {
// create a new view
View v = mInflater.inflate(R.layout.activity2_listview, parent, false);
return new CustomViewHolder(v);
}
// Replace the contents of a view (invoked by the layout manager)
#Override
public void onBindViewHolder(CustomViewHolder holder, int position) {
// - get element from your dataset at this position
// - replace the contents of the view with that element
holder.mTextView.setText(list.get(position));
}
#Override // Return the size of your dataset (invoked by the layout manager)
public int getItemCount() {
return getCount();
}
public int getCount() {
return list.size();
}
public String getItem(int pos) {
return list.get(pos);
}
}
Feel free to use the code as you like.
For more info about the RecyclerView see the google docs: https://developer.android.com/guide/topics/ui/layout/recyclerview

Listview OnItemClick Event

I have following code that should:
listView = (ListView) findViewById(R.id.listview_github_entries);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
}
});
This is what I load into the ListView:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/list_item"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_margin="10dp"
android:orientation="horizontal"
android:clickable="true">
<ImageView
android:layout_width="100dp"
android:layout_height="100dp"
android:src="#mipmap/github_icon"/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:id="#+id/github_name"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<TextView
android:id="#+id/github_url"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>
</LinearLayout>
Here is the Adapter :
public class GithubEntryAdapter extends ArrayAdapter<GithubEntry>{
public GithubEntryAdapter(Activity context, ArrayList<GithubEntry> githubEntries){
super(context, 0, githubEntries);
}
public View getView(int position, View convertView, ViewGroup parent){
View listItemView = convertView;
if (listItemView == null){
listItemView = LayoutInflater.from(getContext()).inflate(
R.layout.list_item, parent, false);
}
GithubEntry currentGithubEntry = getItem(position);
TextView github_url = (TextView) listItemView.findViewById(R.id.github_url);
github_url.setText(currentGithubEntry.getGithub_url());
TextView github_name = (TextView) listItemView.findViewById(R.id.github_name);
github_name.setText(currentGithubEntry.getGithub_name());
return listItemView;
}
}
This is not working for me. Im no quit sure where I should place this code. Can I place this in the onCreate? If not where should I move it? I completly new in Android and I have also not much experience in Java.

Here is what i did for you..
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.Toast;
import java.util.ArrayList;
public class MainActivity extends AppCompatActivity {
private ListView listView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listView = (ListView) findViewById(R.id.listview_github_entries);
listView.setAdapter(new GithubEntryAdapter(MainActivity.this, getList()));
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
TextView github_url_tv = view.findViewById(R.id.github_url);
String url_text= github_url_tv.getText().toString();
Toast.makeText(MainActivity.this, url_text", Toast.LENGTH_LONG).show();
}
});
}
private ArrayList<GithubEntry> getList() {
ArrayList<GithubEntry> githubEntries = new ArrayList<>();
GithubEntry githubEntry = new GithubEntry();
githubEntry.setGithub_name("Name");
githubEntry.setGithub_url("url");
GithubEntry githubEntry1 = new GithubEntry();
githubEntry1.setGithub_name("Name");
githubEntry1.setGithub_url("url");
GithubEntry githubEntry2 = new GithubEntry();
githubEntry2.setGithub_name("Name");
githubEntry2.setGithub_url("url");
githubEntries.add(githubEntry);
githubEntries.add(githubEntry1);
githubEntries.add(githubEntry2);
return githubEntries;
}
}
Here is adapter
import android.app.Activity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;
import java.util.ArrayList;
public class GithubEntryAdapter extends ArrayAdapter<GithubEntry> {
public GithubEntryAdapter(Activity context, ArrayList<GithubEntry>
githubEntries){
super(context, 0, githubEntries);
}
public View getView(int position, View convertView, ViewGroup parent){
View listItemView = convertView;
if (listItemView == null){
listItemView = LayoutInflater.from(getContext()).inflate(
R.layout.list_item, parent, false);
}
GithubEntry currentGithubEntry = getItem(position);
TextView github_url = (TextView) listItemView.findViewById(R.id.github_url);
github_url.setText(currentGithubEntry.getGithub_url());
TextView github_name = (TextView) listItemView.findViewById(R.id.github_name);
github_name.setText(currentGithubEntry.getGithub_name());
return listItemView;
}
}
here is POJO(plan java object) class
class GithubEntry {
private String Github_url;
private String Github_name;
public String getGithub_url() {
return Github_url;
}
public void setGithub_url(String github_url) {
Github_url = github_url;
}
public String getGithub_name() {
return Github_name;
}
public void setGithub_name(String github_name) {
Github_name = github_name;
}
}
and here is list_item
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/list_item"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_margin="10dp"
android:orientation="horizontal"
android:clickable="false">
<ImageView
android:layout_width="100dp"
android:layout_height="100dp"
android:src="#mipmap/ic_launcher_round"/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:id="#+id/github_name"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<TextView
android:id="#+id/github_url"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>
</LinearLayout>
and here is activity layout
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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="match_parent"
android:layout_height="match_parent"
tools:context="com.kaimeramedia.githubentry.MainActivity">
<ListView
android:id="#+id/listview_github_entries"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>

If mean that the OnItemClickListeneter not working, then you need to implement a custom adapter by extending ArrayAdater to serve you custom row, And in the custom adapter you can use a callback interface or implement a listener on the view it self See the example.

I think you want to display the list of values here. You should write it inside onCreate because onCreate is a method where you method starts and run. So, Put it inside onCreate. For more correct answer please explain everything.

Unable to click on custom listview, blocksDescendants not working

I'm fairly new to Android programming and tried everything I could I found on SO, but it still doesn't work.
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/ScrollView01"
android:layout_width="fill_parent"
android:fillViewport="true"
android:layout_height="fill_parent">
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/activity_main"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
tools:context="com.northcityproductions.androidiosapptransfertest1.MainActivity">
<ListView
android:id="#+id/listView1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginTop="18dp"
android:headerDividersEnabled="false"
android:footerDividersEnabled="false" />
<ImageView
android:layout_width="48dp"
android:layout_height="48dp"
android:id="#+id/imageView1"
android:layout_gravity="center_vertical"
android:clickable="false"
android:padding="5dp" />
<TextView
android:id="#+id/textView1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:padding="10dip"
android:paddingStart="50dip"
android:textSize="20dip"
android:layout_gravity="center_vertical"
android:textStyle="bold"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:clickable="false"
android:layout_alignParentStart="true">
</TextView>
</RelativeLayout>
AndroidListAdapter.java
package com.northcityproductions.androidiosapptransfertest1;
import android.app.Activity;
import android.content.Context;
import android.graphics.drawable.Drawable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.List;
public class AndroidListAdapter extends ArrayAdapter {
List<String> androidListViewStrings = new ArrayList<String>();
List<Drawable> imagesId = new ArrayList<Drawable>();
Context context;
public AndroidListAdapter(Activity context, List<Drawable> imagesId, List<String> textListView) {
super(context, R.layout.activity_main, textListView);
this.androidListViewStrings = textListView;
this.imagesId = imagesId;
this.context = context;
}
#Override
public View getView(int i, View view, ViewGroup viewGroup) {
LayoutInflater layoutInflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View viewRow = layoutInflater.inflate(R.layout.activity_main, null,
true);
TextView mtextView = (TextView) viewRow.findViewById(R.id.textView1);
ImageView mimageView = (ImageView) viewRow.findViewById(R.id.imageView1);
mtextView.setText(androidListViewStrings.get(i));
mimageView.setImageDrawable(imagesId.get(i));
return viewRow;
}
}
Finally, MainActivity.java
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//get list of apps
int flags = PackageManager.GET_META_DATA |
PackageManager.GET_SHARED_LIBRARY_FILES |
PackageManager.GET_UNINSTALLED_PACKAGES;
PackageManager pm = getPackageManager();
List<ApplicationInfo> applications = pm.getInstalledApplications(flags);
List<String> applicationsInstalled = new ArrayList<String>();
List<Drawable> applicationIcons = new ArrayList<Drawable>();
//Create map and sort alphabetically
Map applicationsList = new HashMap();
for (ApplicationInfo appInfo : applications) {
if ((appInfo.flags & ApplicationInfo.FLAG_SYSTEM) == 1) {
// System application
} else {
// Installed by user
String appName = (String) pm.getApplicationLabel((appInfo));
appName = appName.substring(0, 1).toUpperCase() + appName.substring(1);
applicationsList.put(appName, pm.getApplicationIcon(appInfo));
}
}
Map<String, Drawable> treeApps = new TreeMap<String, Drawable>(applicationsList);
for (Map.Entry<String, Drawable> appMap : treeApps.entrySet()) {
applicationsInstalled.add(appMap.getKey());
applicationIcons.add(appMap.getValue());
}
//Arrange them in listview
final AndroidListAdapter androidListAdapter = new AndroidListAdapter(this, applicationIcons, applicationsInstalled);
ListView lv1 = (ListView) findViewById(R.id.listView1);
lv1.setAdapter(androidListAdapter);
lv1.setOnItemClickListener(new OnItemClickListener(){
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long rowId) {
AlertDialog.Builder adb = new AlertDialog.Builder(MainActivity.this);
adb.setTitle("List");
adb.setMessage(" selected Item is="+parent.getItemAtPosition(position));
adb.setPositiveButton("Ok", null);
adb.show();
}
});
}
}
I have tried adding the blocksDescendants code in my activity_main.xml under Listview, and Relativelayout, but that doesn't seem to fix it. I also tried setting the focusable property to false for the imageview and textview but that didn't fix it either.

Android : Determine which checkbox is checked in listview from the Main activity button

I have use the following code for ListView with custom adapter. The Code is Working fine for me,
In ListView there is one checkbox, TextView, ImageView and Button in every ListView Row. Data will fetched Through HttpPost method and assign in every row of listview there is no problem.
I want to get the all the checkbox which is checked in listview, Click on Button of Main Activity.
I have read many article and example but could not get the proper answer these.
Code for : MainActivity.java file which button is clicked and give the Toast as "button is clicked".
package com.example.listviewimageloadingexample;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.Toast;
public class MainActivity extends Activity implements OnClickListener {
// Declare Variables
JSONObject jsonobject;
JSONArray jsonarray;
ListView listview;
ListViewAdapter adapter;
ProgressDialog mProgressDialog;
ArrayList<HashMap<String, String>> arraylist;
static String RANK = "rank";
static String COUNTRY = "country";
static String POPULATION = "population";
static String FLAG = "flag";
Button processedAllBtn;
CheckBox processAll;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Get the view from listview_main.xml
setContentView(R.layout.listview_main);
processedAllBtn=(Button) findViewById(R.id.btnProcessedAllAbove);
processedAllBtn.setOnClickListener(this);
// Locate the listview in listview_main.xml
listview = (ListView) findViewById(R.id.listview);
Object obj=(ListViewAdapter)getLastNonConfigurationInstance();
if(obj==null)
{
// Execute DownloadJSON AsyncTask
new DownloadJSON().execute();
}
else
{
adapter=(ListViewAdapter)obj;
setListView();
}
}
#Override
public void onClick(View arg0) {
switch(arg0.getId())
{
case R.id.btnProcessedAllAbove:
//Toast.makeText(getApplicationContext(), "button is clicked "+arg0.getId(), Toast.LENGTH_SHORT).show();
break;
}
}
// DownloadJSON AsyncTask
private class DownloadJSON extends AsyncTask<Void, Void, Void> {
#Override
protected void onPreExecute() {
super.onPreExecute();
// Create a progressdialog
mProgressDialog = new ProgressDialog(MainActivity.this);
// Set progressdialog title
mProgressDialog.setTitle("Android JSON Parse Tutorial");
// Set progressdialog message
mProgressDialog.setMessage("Loading...");
mProgressDialog.setIndeterminate(false);
// Show progressdialog
mProgressDialog.show();
}
#Override
protected Void doInBackground(Void... params) {
// Create an array
arraylist = new ArrayList<HashMap<String, String>>();
// Retrieve JSON Objects from the given URL address
jsonobject = JSONfunctions.getJSONfromURL("WEBSERVICE_URL");
try {
// Locate the array name in JSON
//jsonarray = jsonobject.getJSONArray("worldpopulation");
jsonarray = jsonobject.getJSONArray("students");
String flag="";
for (int i = 0; i < jsonarray.length(); i++) {
HashMap<String, String> map = new HashMap<String, String>();
JSONObject jsonobject = jsonarray.getJSONObject(i);
JSONObject student_object = jsonobject.getJSONObject("students");
// Retrive JSON Objects
map.put("rank", student_object.getString("id"));
map.put("country", student_object.getString("name"));
map.put("population", student_object.getString("roll_number"));
flag = student_object.getString("student_photo");
flag = flag.replace(" ", "%20");
map.put("flag", "WEBSERVICE_URL"+flag);
// Set the JSON Objects into the array
arraylist.add(map);
}
} catch (JSONException e) {
Log.e("Error", e.getMessage());
e.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(Void args) {
setListView();
// Close the progressdialog
mProgressDialog.dismiss();
}
}
#Override
public Object onRetainNonConfigurationInstance() {
return adapter;
}
public void setListView()
{
if(adapter==null)
{
// Pass the results into ListViewAdapter.java
adapter = new ListViewAdapter(MainActivity.this, arraylist);
}
// Set the adapter to the ListView
listview.setAdapter(adapter);
}
}
Code for : ListAdapter.java File
package com.example.listviewimageloadingexample;
import java.util.ArrayList;
import java.util.HashMap;
import android.content.Context;
import android.content.Intent;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
public class ListViewAdapter extends BaseAdapter {
// Declare Variables
Context context;
LayoutInflater inflater;
ArrayList<HashMap<String, String>> data;
ImageLoader imageLoader;
HashMap<String, String> resultp = new HashMap<String, String>();
boolean[] itemChecked;
public ListViewAdapter(Context context, ArrayList<HashMap<String, String>> arraylist)
{
super();
this.context = context;
data = arraylist;
imageLoader = new ImageLoader(context);
itemChecked = new boolean[data.size()];
}
#Override
public int getCount() {
return data.size();
}
#Override
public Object getItem(int position) {
return data.get(position);
}
#Override
public long getItemId(int position) {
return 0;
}
public class ViewHolder
{
TextView rank;
TextView country;
TextView population;
Button processedBtn;
ImageView flag;
CheckBox processedCheckBox;
}
#Override
public View getView(final int position, View convertView, ViewGroup parent)
{
View view=convertView;
final ViewHolder viewHolder;
LayoutInflater inflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
if(view == null)
{
view = inflater.inflate(R.layout.listview_item, null);
viewHolder= new ViewHolder();
// Locate the TextViews in listview_item.xml
viewHolder.rank = (TextView) view.findViewById(R.id.rank);
viewHolder.country = (TextView) view.findViewById(R.id.country);
viewHolder.population = (TextView) view.findViewById(R.id.population);
// Locate the ImageView in listview_item.xml
viewHolder.flag = (ImageView) view.findViewById(R.id.flag);
viewHolder.processedBtn = (Button) view.findViewById(R.id.btnProcessed);
viewHolder.processedCheckBox = (CheckBox)view.findViewById(R.id.processedCheckBox);
view.setTag(viewHolder);
}
else
{
viewHolder=(ViewHolder)view.getTag();
}
// Get the position
resultp = data.get(position);
// Capture position and set results to the TextViews
viewHolder.rank.setText(resultp.get(MainActivity.RANK));
viewHolder.country.setText(resultp.get(MainActivity.COUNTRY));
viewHolder.population.setText(resultp.get(MainActivity.POPULATION));
// Capture position and set results to the ImageView
// Passes flag images URL into ImageLoader.class
imageLoader.DisplayImage(resultp.get(MainActivity.FLAG), viewHolder.flag);
viewHolder.processedBtn.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View arg0) {
// Get the position
resultp = data.get(position);
Intent intent = new Intent(context, SingleItemView.class);
// Pass all data rank
intent.putExtra("rank", resultp.get(MainActivity.RANK));
// Pass all data country
intent.putExtra("country", resultp.get(MainActivity.COUNTRY));
// Pass all data population
intent.putExtra("population",resultp.get(MainActivity.POPULATION));
// Pass all data flag
intent.putExtra("flag", resultp.get(MainActivity.FLAG));
// Start SingleItemView Class
context.startActivity(intent);
}
});
viewHolder.processedCheckBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener()
{
#Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
// TODO Auto-generated method stub
itemChecked[position]=(!itemChecked[position]);
viewHolder.processedCheckBox.setChecked(itemChecked[position]);
}
});
return view;
}
}
Code for : listitem.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<CheckBox
android:id="#+id/processedCheckBox"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical|center_horizontal"
android:saveEnabled="false" />
<ImageView
android:id="#+id/flag"
android:layout_width="80dp"
android:layout_height="80dp"
android:layout_gravity="center_vertical|center_horizontal"
android:padding="5dp"/>
<TextView
android:id="#+id/rank"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical|center_horizontal"
android:text="id"
android:textStyle="bold"
android:visibility="gone" />
<TextView
android:id="#+id/country"
android:layout_width="100dp"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical|center_horizontal"
android:text="Name"
android:textStyle="bold" />
<TextView
android:id="#+id/population"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical|center_horizontal"
android:text="Roll_No"
android:textStyle="bold"
android:visibility="gone" />
<Button
android:id="#+id/btnProcessed"
android:layout_width="90dp"
android:layout_height="30dp"
android:textSize="15sp"
android:layout_gravity="center_vertical|center_horizontal"
android:background="#drawable/buttonshape"
android:text="Processed"
android:textColor="#FFFFFF"
android:layout_marginLeft="2dp" />
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:orientation="vertical" >
<View
android:layout_width="fill_parent"
android:layout_height="1dp"
android:background="#000000" />
</LinearLayout>
</LinearLayout>
Code for : listview_main.xml
<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/ScrollView1"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<CheckBox
android:id="#+id/checkAllAbove"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Select All" />
<Button
android:id="#+id/btnProcessedAllAbove"
android:layout_width="90dp"
android:layout_height="30dp"
android:layout_marginLeft="119dp"
android:background="#drawable/buttonshape"
android:text="Processed"
android:textColor="#FFFFFF"
android:textSize="15sp" />
</LinearLayout>
<View
android:layout_width="match_parent"
android:layout_height="1dp"
android:background="#000000" />
<ListView
android:id="#+id/listview"
android:layout_width="match_parent"
android:layout_height="320dp" />
<View
android:layout_width="match_parent"
android:layout_height="1dp"
android:background="#000000" />
</LinearLayout>
</ScrollView>

there is a checkbox getTag() method, use this with some logic and you should be fine
see: http://amitandroid.blogspot.in/2013/03/android-listview-with-checkbox-and.html

Take a look on this very good tutorial:
http://www.vogella.com/tutorials/AndroidListView/article.html#listviewselection
It used the setTag() / getTag() functions.

Thanks to everyone.
I Found answer from these Link. Following code get all the objects from listview.
...
#Override
public void onClick(View arg0)
{
CheckBox cb;
for (int x = 0; x <listview.getChildCount();x++)
{
TextView tvRank=(TextView)listview.getChildAt(x).findViewById(R.id.rank);
TextView tvCountry=(TextView)listview.getChildAt(x).findViewById(R.id.country);
TextView tvPopulation=(TextView)listview.getChildAt(x).findViewById(R.id.population);
String rank=tvId.getText().toString();
String country=tvName.getText().toString();
String population=tvRno.getText().toString();
cb = (CheckBox)listview.getChildAt(x).findViewById(R.id.processedCheckBox);
if(cb.isChecked())
{
Toast.makeText(getApplicationContext(),rank+"-"+country+"-"+population, Toast.LENGTH_SHORT).show();
}
}
}

Adding a remove button in my item list

I am fairly new to Java and Android development. I am currently creating a shopping app and was looking at adding a "Remove" button to my Shopping Cart list.
Here is my current code for my list activity for my shopping cart, I am not really sure where to begin and some guidance would be greatly appreciated.
Thanks
package .shopper;
import java.util.List;
import android.os.Bundle;
import android.app.Activity;
import android.app.ListActivity;
import android.content.Context;
import android.content.Intent;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import android.support.v4.app.NavUtils;
public class CartListActivity extends ListActivity {
public class ProductListAdapter extends BaseAdapter {
private final Context context;
private List<Product> itemList;
public List<Product> getItemList() {
return itemList;
}
public void setItemList(List<Product> itemList) {
this.itemList = itemList;
}
public Context getContext() {
return context;
}
public ProductListAdapter(Context c) {
context = c;
}
#Override
public int getCount() {
if(itemList == null) return 0;
else return itemList.size();
}
#Override
public Object getItem(int position) {
if (itemList == null) return null;
else return itemList.get(position);
}
#Override
public long getItemId(int position) {
if (itemList == null) return 0;
else return itemList.get(position).hashCode();
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
View cell = convertView;
if (cell == null) {
// get layout from mobile xml
LayoutInflater inflater = ((Activity)context).getLayoutInflater();
cell = inflater.inflate(R.layout.adapter_product_list, parent, false);
}
Product p = itemList.get(position);
//set value into textview according to position
TextView textView = (TextView) cell.findViewById(R.id.product_title);
textView.setText(p.getProductName());
// add £ symbol
textView = (TextView) cell.findViewById(R.id.product_info);
textView.setText("Price: " + "£"+ p.getPrice());
//set value into imageview according to position
ImageView imgView = (ImageView) cell.findViewById(R.id.product_image);
// clear the image
imgView.setImageDrawable(null);
//and load from the network
p.loadImage(imgView, 54, 54);
return cell;
}
}
public static final Integer[] productIcons = {
0, // index 0 is empty
R.drawable.books,
R.drawable.films,
R.drawable.music,
R.drawable.games,
};
private int categoryId;
private ProductListAdapter adapter;
private ListViewLoader loader;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// get the category from the intent
Intent intent = getIntent();
categoryId = intent.getIntExtra(MainActivity.SELECTED_CATEGORY, 0);
adapter = new ProductListAdapter(this);
setListAdapter(adapter);
// Show the Up button in the action bar.
setupActionBar();
loader = new ListViewLoader(adapter, categoryId);
loader.execute(String.format(MainActivity.WEBSERVER_GETLIST, categoryId));
}
/**
* Set up the {#link android.app.ActionBar}.
*/
private void setupActionBar() {
getActionBar().setDisplayHomeAsUpEnabled(true);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.product_list, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.show_cart:
//create the intent for the cart activity
Intent intent = new Intent(getApplicationContext(), CartActivity.class);
startActivity(intent);
return true;
}
return super.onOptionsItemSelected(item);
}
#Override
public void onListItemClick(ListView l, View v, int position, long id) {
//create an intent
Intent intent = new Intent(this, ProductActivity.class);
Product p = (Product)adapter.getItem(position);
//specify the extra parameters we want to pass
intent.putExtra(MainActivity.SELECTED_CATEGORY, p.getCategoryId());
intent.putExtra(MainActivity.SELECTED_PRODUCTID, p.getProductId());
intent.putExtra(MainActivity.SELECTED_PRODUCTNAME, p.getProductName());
intent.putExtra(MainActivity.SELECTED_PRODUCTPRICE, p.getPrice());
intent.putExtra(MainActivity.SELECTED_SUITABLEFORKIDS, p.getSuitableForKids());
startActivity(intent);
}
}
EDIT:
XML for adapter_product_list
<?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:padding="8dp">
<ImageView
android:id="#+id/product_image"
android:layout_width="54dp"
android:layout_height="54dp"
android:padding="5dp"
android:layout_alignParentLeft="true" />
<TextView
android:id="#+id/product_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="#+id/product_image"
android:layout_alignTop="#+id/product_image"
android:textColor="#446688"
android:textSize="20sp" />
<TextView
android:id="#+id/product_info"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="#+id/product_image"
android:layout_below="#+id/product_title"
android:textColor="#777777"
android:textSize="16sp"
android:textStyle="italic" />
</RelativeLayout>

Change your xml like following
<?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:padding="8dp" >
<ImageView
android:id="#+id/product_image"
android:layout_width="54dp"
android:layout_height="54dp"
android:layout_alignParentLeft="true"
android:padding="5dp"
android:src="#drawable/ic_launcher" />
<TextView
android:id="#+id/product_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignTop="#+id/product_image"
android:layout_toRightOf="#+id/product_image"
android:text="adjkajdjk"
android:textColor="#446688"
android:textSize="20sp" />
<TextView
android:id="#+id/product_info"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/product_title"
android:layout_toRightOf="#+id/product_image"
android:text="adjkajdjk"
android:textColor="#777777"
android:textSize="16sp"
android:textStyle="italic" />
<Button
android:id="#+id/delete_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:text="Delete" />
</RelativeLayout>
And in your adapter inside getView() function add this
Button deleteBtn = (Button) findViewById(R.id.delete_btn);
deleteBtn.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v)
{
itemList.remove(position);
notifyDataSetChanged();
}
});

1) hope p.loadImage(imgView, 54, 54); is running in a asyncTask
2) if you want to click on a button in a row of a ListView than you shoudl add the button to your row layout and implent onClickListenr of that button in your getView method of adapter.in onClick method yous hould have:
if(position<itemList.size()){
//TO REMOVE TEM FROM ARRAY LIST
itemList.remove(position);
//TO Update the ListView
notifyDataSetChanged();
}
you can implement a multy line delete,by adding a checkbox in your listRow and adding the positon of the item to be deleted to an arrayList of Integers and after click-ing the delete button you should delete all the items from the imteList and after that call notifyDataSetChanged()
EDIT
<?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:padding="8dp">
<ImageView
android:id="#+id/product_image"
android:layout_width="54dp"
android:layout_height="54dp"
android:padding="5dp"
android:layout_alignParentLeft="true" />
<TextView
android:id="#+id/product_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="#+id/product_image"
android:layout_alignTop="#+id/product_image"
android:textColor="#446688"
android:textSize="20sp" />
<TextView
android:id="#+id/product_info"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="#+id/product_image"
android:layout_below="#+id/product_title"
android:textColor="#777777"
android:textSize="16sp"
android:textStyle="italic" />
<Button
android:id="#+id/deleteBtn"
android:layout_width="wrap_content
android:layout_height="wrap_content"
android:layout_toRightOf="#+id/product_info"
</RelativeLayout>
you should add this button to your layout, and in getView method of adapter add
Button delete=v.findViewById(R.id.deleteBtn);
delete.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v) {
//THE PART I WROTE ABOVE
}
})