Develop Reference

Add a dynamic button to the view and save it permanently

I have a fragment with this view:
XML:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:tag="general"
android:id="#+id/root"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#343535"
android:orientation="vertical"
tools:context=".fragments.GeneralFragment">
<Button
android:id="#+id/hello"
android:layout_width="match_parent"
android:layout_height="60dp"
android:gravity="center_vertical"
android:onClick="onClick"
android:text="#string/hello" />
<Button
android:id="#+id/observed"
android:layout_width="match_parent"
android:layout_height="60dp"
android:gravity="center_vertical"
android:onClick="onClick"
android:text="#string/observed" />
<Button
android:id="#+id/thanks"
android:layout_width="match_parent"
android:layout_height="60dp"
android:gravity="center_vertical"
android:onClick="onClick"
android:text="#string/thanks" />
</LinearLayout>
There are 3 buttons. Whenever you click on one of them, its text will be displayed.
Now I would like to add another button but dynamically. It should be added before #+id/hello.
I have tried it with
LinearLayout root = (LinearLayout) view.findViewById(R.id.root);
root.addView();
but it looks completely wrong since some parameters are missing.
For instance, the new button should be like:
XML:
<Button
android:layout_width="match_parent"
android:layout_height="60dp"
android:gravity="center_vertical"
android:onClick="onClick"
android:text="I am a dynamic text" />
This button should be saved permanently in the app. How can I do this?
Update
I am using a dialog, so this is the class:
#SuppressLint("ValidFragment")
public class Dialog extends DialogFragment {
private final int _layout;
private TextInputEditText _customTextField;
#SuppressLint("ValidFragment")
public Dialog(int layout) {
_layout = layout;
}
public interface ICustomTts {
void customTts(String input, Activity activity);
}
public ICustomTts iCustomTts;
public interface ITarget {
void getTarget(String input);
}
public ITarget iTarget;
#RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, Bundle savedInstanceState) {
final View view = inflater.inflate(_layout, container, false);
// Display fragment_custom
if (_layout == R.layout.fragment_custom) {
_customTextField = view.findViewById(R.id.customTextField);
Button _customBtn = view.findViewById(R.id.customCta);
_customBtn.setOnClickListener(new View.OnClickListener() {
#RequiresApi(api = Build.VERSION_CODES.M)
#Override
public void onClick(View view) {
Log.d(TAG, "onClick: Clicked on CTA of custom");
String input = _customTextField.getText().toString();
if (!input.equals("")) {
iCustomTts.customTts(input, getActivity());
_dismiss();
}
}
});
MaterialCheckBox customeSave = view.findViewById(R.id.customSave);
customeSave.setOnClickListener(new View.OnClickListener() {
#RequiresApi(api = Build.VERSION_CODES.M)
#Override
public void onClick(View v) {
Log.d(TAG, "customeSave was clicked!");
LinearLayout root = view.findViewById(R.id.root);
Button button = new Button(getContext());
float heightInPixel = 60 * getResources().getDisplayMetrics().density;
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, (int) heightInPixel);
params.gravity = Gravity.CENTER;
button.setText("I am a dynamic text");
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// Do the stuff on the click
}
});
root.addView(button, 0);
}
});
}
// Display fragment_target
if (_layout == R.layout.fragment_target) {
_customTextField = view.findViewById(R.id.targetTextField);
Button _customBtn = view.findViewById(R.id.targetCta);
_customBtn.setOnClickListener(new View.OnClickListener() {
#RequiresApi(api = Build.VERSION_CODES.M)
#Override
public void onClick(View view) {
Log.d(TAG, "onClick: Clicked on CTA of target");
String input = _customTextField.getText().toString();
if (!input.equals("")) {
iTarget.getTarget(input);
_dismiss();
}
}
});
}
return view;
}
/**
* Dismissing the dialog
*/
private void _dismiss() {
this.dismiss();
}
#Override
public void onAttach(Context context) {
super.onAttach(context);
try {
if (_layout == R.layout.fragment_custom) {
iCustomTts = (ICustomTts) getActivity();
}
else if (_layout == R.layout.fragment_target) {
iTarget = (ITarget) getActivity();
}
}
catch (ClassCastException e) {
Log.e(TAG, "onAttach: ClassCastException: " + e.getMessage());
}
}
}

You need to use the two-argument version of addView() to determine the order (index) of the button inside the LinearLayout:
LinearLayout root = view.findViewById(R.id.root);
Button button = new Button(requireContext());
float heightInPixel = 60 * getResources().getDisplayMetrics().density;
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, (int) heightInPixel);
params.gravity = Gravity.CENTER;
button.setText("I am a dynamic text");
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// Do the stuff on the click
}
});
root.addView(button, 0);

How Do I Remove Selected Item From ArrayList and ArrayAdapter On Button Click?

I have ListView with a custom list layout. I am using an ArrayList and ArrayAdapter for this. I am having a difficult time removing selected items from the arraylist. I am not sure want I am doing wrong. Here's an example of a arraylist that I have:
Item A
Item B
Item C
Item D
Let's say that I selected Item C next on button clicked labeled "Remove" I want Item C removed from the list. How do I accomplish this? Currently my code only removes the item on index 0. I want selected item index to be removed.
Here's my codes...
Java Class:
public class MainActivity extends AppCompatActivity {
ListView lstVw;
Button addBtn, removeBtn, clearListBtn;
ArrayList<String> arrayList;
ArrayAdapter<String> adapter;
int getPosition = 0;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
lstVw = findViewById(R.id.lstView);
addBtn = findViewById(R.id.add_item_btn);
removeBtn = findViewById(R.id.remove_item_btn);
clearListBtn = findViewById(R.id.clear_list_btn);
arrayList = new ArrayList<>();
adapter = new ArrayAdapter<>(getApplicationContext(), R.layout.item_list, R.id.item_tv, arrayList);
lstVw.setAdapter(adapter);
lstVw.setOnItemClickListener(new android.widget.AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
String getItem = adapter.getItem(position);
getPosition = Integer.parseInt(getItem);
}
});
addBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
final AlertDialog.Builder adb = new AlertDialog.Builder(MainActivity.this);
adb.setTitle("Enter Item Name");
final EditText itemTxt = new EditText(MainActivity.this);
itemTxt.setText(getString(R.string.default_item_name_value));
itemTxt.setInputType(InputType.TYPE_CLASS_TEXT);
adb.setView(itemTxt);
adb.setPositiveButton("Add", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
String getItem = itemTxt.getText().toString();
Set<String> s = new LinkedHashSet<>(arrayList);
if (s.contains(getItem)) {
arrayList.clear();
arrayList.addAll(s);
Toast.makeText(getApplicationContext(), getItem + " already exists in the list!", Toast.LENGTH_LONG).show();
} else {
arrayList.add(getItem);
adapter.notifyDataSetChanged();
}
}
});
adb.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
}
});
adb.create();
adb.show();
}
});
clearListBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (!arrayList.isEmpty()) {
arrayList.clear();
adapter.notifyDataSetChanged();
}
}
});
removeBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
String getItem = arrayList.get(getPosition);
arrayList.remove(getItem);
adapter.notifyDataSetChanged();
Toast.makeText(getApplicationContext(), getItem + " is removed!", Toast.LENGTH_LONG).show();
}
});
}
}
Main XML:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/rl"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center">
<ScrollView
android:layout_width="match_parent"
android:layout_height="650dp">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="650dp">
<ListView
android:id="#+id/lstView"
android:layout_width="match_parent"
android:layout_height="650dp"
tools:ignore="NestedScrolling" />
</RelativeLayout>
</ScrollView>
<include layout="#layout/action_buttons"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"/>
Action Buttons XML:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="50dp"
android:layout_gravity="center|top">
<Button
android:id="#+id/add_item_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:textAllCaps="false"
android:text="#string/add_item_text"
android:textSize="14sp"
android:textStyle="bold"
android:textColor="#android:color/black"/>
<Button
android:id="#+id/remove_item_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_toEndOf="#id/add_item_btn"
android:textAllCaps="false"
android:text="Remove Item"
android:textColor="#android:color/black"
android:textSize="14sp"
android:textStyle="bold"/>
<Button
android:id="#+id/clear_list_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_toEndOf="#id/remove_item_btn"
android:textAllCaps="false"
android:text="#string/clear_list_text"
android:textSize="14sp"
android:textStyle="bold"
android:textColor="#android:color/black"/>
My Custom List Layout XML:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/container"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<ScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="#+id/item_tv"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textStyle="bold"
android:textSize="20sp"
android:textColor="#android:color/black"/>
</ScrollView>
I appreciate the help! Thanks!

removeBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
String getItem = arrayList.get(getPosition);
arrayList.remove(getItem);
adapter.notifyDataSetChanged();
Toast.makeText(getApplicationContext(), getItem + " is removed!", Toast.LENGTH_LONG).show();
}
});
From where are you getting this getPosition?

It looks to me like your int getPosition = 0; variable is not getting updated with your new position. On your click listener you are trying to parse the value of your selected item to an Integer, maybe you could try simply updating with the current position instead?
lstVw.setOnItemClickListener(new android.widget.AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
getPosition = position;
}
});
Edit:
You could go with something like this:
Create an interface that your activity will implement and will be used by your adapter to notify a position change:
public interface PositionChangeListener {
void onPositionChanged(int newPosition);
}
Create a custom adapter:
public class CustomAdapterView extends BaseAdapter {
private Context context;
private PositionChangeListener listener;
private ArrayList<String> items;
public CustomAdapterView(Context context, ArrayList<String> items, PositionChangeListener listener) {
this.context = context;
this.items = items;
this.listener = listener;
}
#Override
public int getCount() {
return items.size();
}
#Override
public Object getItem(int position) {
return items.get(position);
}
#Override
public long getItemId(int position) {
return 0;
}
#Override
public View getView(final int position, View convertView, ViewGroup parent) {
ViewHolder viewHolder = null;
if (convertView == null) {
convertView = LayoutInflater.from(context).inflate( R.layout.item_list, null);
viewHolder = new ViewHolder();
viewHolder.txt = convertView.findViewById(R.id.item_tv);
viewHolder.txt.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
listener.onPositionChanged(position);
}
});
convertView.setTag(viewHolder);
} else {
viewHolder = (ViewHolder) convertView.getTag();
}
viewHolder.txt.setText(items.get(position));
return convertView;
}
private class ViewHolder {
TextView txt;
}
}
And now in your activity:
public class MainActivity extends AppCompatActivity implements PositionChangeListener{
ListView lstVw;
Button addBtn, removeBtn, clearListBtn;
ArrayList<String> arrayList;
BaseAdapter adapter;
int getPosition = 0;
#Override
public void onPositionChanged(int newPosition) {
getPosition = newPosition;
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
lstVw = findViewById(R.id.lstView);
addBtn = findViewById(R.id.add_item_btn);
removeBtn = findViewById(R.id.remove_item_btn);
clearListBtn = findViewById(R.id.clear_list_btn);
arrayList = new ArrayList<>();
adapter = new CustomAdapterView(this, arrayList, this);
lstVw.setAdapter(adapter);
addBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
final AlertDialog.Builder adb = new AlertDialog.Builder(MainActivity.this);
adb.setTitle("Enter Item Name");
final EditText itemTxt = new EditText(MainActivity.this);
itemTxt.setText("default item name");
itemTxt.setInputType(InputType.TYPE_CLASS_TEXT);
adb.setView(itemTxt);
adb.setPositiveButton("Add", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
String getItem = itemTxt.getText().toString();
Set<String> s = new LinkedHashSet<>(arrayList);
if (s.contains(getItem)) {
arrayList.clear();
arrayList.addAll(s);
Toast.makeText(getApplicationContext(), getItem + " already exists in the list!", Toast.LENGTH_LONG).show();
} else {
arrayList.add(getItem);
adapter.notifyDataSetChanged();
}
}
});
adb.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
}
});
adb.create();
adb.show();
}
});
clearListBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (!arrayList.isEmpty()) {
arrayList.clear();
adapter.notifyDataSetChanged();
}
}
});
removeBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
String getItem = arrayList.get(getPosition);
arrayList.remove(getItem);
adapter.notifyDataSetChanged();
Toast.makeText(getApplicationContext(), getItem + " is removed!", Toast.LENGTH_LONG).show();
}
});
}
}

Menu item click in a navigation drawer intent to activity hosting a fragment

Disclaimer: This is the first app I am building so I am learning the hard way to use fragments first, so my code is all over the place.
I have menu items inside a navigation view that loads fine however the menu item clicks don't work. It doesn't crash it just stares at me. I would like to use an intent to display a fragment and I am lost from changing and trying so many different options.
XML FOR NAV DRAWER & MENU ITEMS:
<android.support.v4.widget.DrawerLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/activity_pageone"
android:background="#drawable/rygg"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbarThumbVertical="#color/primary_dark_color"
tools:openDrawer="start"
tools:context="com.android.nohiccupsbeta.pageone">
<FrameLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/fragmentContainer"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<android.support.design.widget.NavigationView
android:id="#+id/navigation_header_container"
app:headerLayout="#layout/header"
android:layout_width="wrap_content"
android:layout_height="match_parent"
app:itemIconTint="#color/category_vodka"
app:itemTextColor="#color/primary_dark_color"
app:menu="#menu/drawermenu"
android:layout_gravity="start" >
</android.support.design.widget.NavigationView>
</FrameLayout>
</android.support.v4.widget.DrawerLayout>
JAVA:
public class pageone extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener {
DrawerLayout mDrawerLayout;
ActionBarDrawerToggle mToggle;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_pageone);
setupDrawer();
}
#Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
mToggle.onConfigurationChanged(newConfig);
}
#Override
public boolean onCreateOptionsMenu(Menu menu){
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.drawermenu, menu);
return true;
}
/**
*
* #param item For the hamburger button
* #return
*/
#Override
public boolean onOptionsItemSelected(MenuItem item) {
if (mToggle.onOptionsItemSelected(item)){
return true;
}
switch (item.getItemId()) {
case R.id.itemWhiskey:
Intent whiskeyIntent = new Intent(pageone.this, whiskeyActivity.class);
startActivity(whiskeyIntent);
return true;
default:
return super.onOptionsItemSelected(item);
}
}
/**
* Make sure the drawer open and closes in sync with UI visual
* #param savedInstanceState
*/
#Override
protected void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
mToggle.syncState();
}
/**
* Function to make sure all the drawer open & closes properly
*/
public void setupDrawer() {
getSupportActionBar().setHomeButtonEnabled(true);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
mDrawerLayout = (DrawerLayout) findViewById(R.id.activity_pageone);
mToggle = new ActionBarDrawerToggle(this, mDrawerLayout, R.string.drawer_open, R.string.drawer_closed) {
#Override
public void onDrawerClosed(View closeView) {
Toast.makeText(pageone.this, "Happy You Learned", Toast.LENGTH_SHORT).show();
super.onDrawerClosed(closeView);
invalidateOptionsMenu();
}
#Override
public void onDrawerOpened(View openView) {
Toast.makeText(pageone.this, "Effects Of Alcohol", Toast.LENGTH_SHORT).show();
super.onDrawerOpened(openView);
invalidateOptionsMenu();
}
};
mDrawerLayout.addDrawerListener(mToggle);
}
#Override
public boolean onNavigationItemSelected(#NonNull MenuItem item) {
MenuItem itemWhiskey = (MenuItem) findViewById(R.id.itemWhiskey);
itemWhiskey.setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
#Override
public boolean onMenuItemClick(MenuItem itemWhiskey) {
FragmentManager fm = getSupportFragmentManager();
Fragment effectsFragment = fm.findFragmentById(R.id.frame_container2);
if (effectsFragment == null) {
effectsFragment = new WhiskeyFragment();
fm.beginTransaction().add(R.id.frame_container2, effectsFragment).commit();
getSupportActionBar().setTitle("Whiskey");
itemWhiskey.setChecked(true);
mDrawerLayout.closeDrawers();
}
return true;
}
});
mDrawerLayout.closeDrawer(GravityCompat.START);
return true;
}
}
XML FOR FRAGMENT:
<FrameLayout 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"
android:orientation="vertical"
android:id="#+id/frame_container2"
tools:context="com.android.nohiccupsbeta.WhiskeyFragment">
<!-- TODO: Update blank fragment layout -->
<TextView
android:id="#+id/frag_whiskey_skin"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:layout_marginTop="8dp"
android:textColor="#000000"
android:textSize="16sp" />
<ImageButton
android:id="#+id/expand_collapse"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="end|bottom"
android:background="#android:color/transparent"
android:src="#drawable/ic_expand_more"
android:padding="16dp"/>
</FrameLayout>
JAVA:
public class WhiskeyFragment extends Fragment {
private TextView mWhiskeySkin;
#Override
public void onViewCreated(View view, #Nullable Bundle SavedInstanceState) {
super.onViewCreated(view, SavedInstanceState);
getActivity().setTitle("WHISKEY EFFECTS");
mWhiskeySkin = (TextView) view.findViewById(R.id.frag_whiskey_skin);
mWhiskeySkin.setText(R.string.whiskey_skin);
hasOptionsMenu();
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View v = inflater.inflate(R.layout.fragment_whiskey, container, false);
hasOptionsMenu();
return v;
}
}
XML FOR SECOND ACTIVITY:
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/frame_container"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
JAVA:
public class whiskeyActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_whiskey);
}
public class Whiskeyed {
private String whiskeySkin;
private String whiskeyBrain;
public String getWhiskeySkin(){
return whiskeySkin;
}
public String getWhikeyBrain(){
return whiskeyBrain;
}
public void setWhiskeySkin(String whiskey_skin){
this.whiskeySkin = whiskey_skin;
}
public void setWhiskeyBrain(String whiskeyBrain) {
this.whiskeyBrain = whiskeyBrain;
}
}
}

try to change to content of your onNavigationItemSelected of your pageone.java
from here:
#Override
public boolean onNavigationItemSelected(#NonNull MenuItem item) {
MenuItem itemWhiskey = (MenuItem) findViewById(R.id.itemWhiskey);
itemWhiskey.setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
#Override
public boolean onMenuItemClick(MenuItem itemWhiskey) {
FragmentManager fm = getSupportFragmentManager();
Fragment effectsFragment = fm.findFragmentById(R.id.frame_container2);
if (effectsFragment == null) {
effectsFragment = new WhiskeyFragment();
fm.beginTransaction().add(R.id.frame_container2, effectsFragment).commit();
getSupportActionBar().setTitle("Whiskey");
itemWhiskey.setChecked(true);
mDrawerLayout.closeDrawers();
}
return true;
}
});
mDrawerLayout.closeDrawer(GravityCompat.START);
return true;
}
to here:
#Override
public boolean onNavigationItemSelected(#NonNull MenuItem item) {
DrawerLayout mDrawerLayout = (DrawerLayout) findViewById(R.id.activity_pageone); // ID of your drawerLayout
int id = item.getItemId();
switch (id) {
case R.id.menu1: // Change this as your menuitem in menu.xml.
// Your fragment code goes here..
FragmentManager fm = getSupportFragmentManager();
Fragment effectsFragment = fm.findFragmentById(R.id.frame_container2);
if (effectsFragment == null) {
effectsFragment = new WhiskeyFragment();
fm.beginTransaction().add(R.id.frame_container2, effectsFragment).commit();
getSupportActionBar().setTitle("Whiskey");
itemWhiskey.setChecked(true);
mDrawerLayout.closeDrawers();
}
break;
case R.id.menu2: // Change this as your menuitem in menu.xml.
// or Your fragment code goes here...
break;
}
mDrawerLayout.closeDrawer(GravityCompat.START, true);
return true;
}

json data from server is not displayed in listview

I am trying to retrieve data from server and display it in listview. But when I compile this it is not working and the list is even not showing in the activity.
Mylist.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:layout_marginTop="#dimen/fab_margin"
android:orientation="vertical" >
<AbsoluteLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<LinearLayout android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:id="#+id/edItem"
android:layout_width="180dp"
android:layout_marginTop="10dp"
android:layout_height="40dp"
android:layout_marginLeft="10dp"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="180dp"
android:orientation="horizontal">
<TextView
android:id="#+id/edUnit"
android:layout_width="100dp"
android:layout_marginTop="80dp"
android:layout_height="40dp"
android:layout_marginRight="10dp"
android:layout_marginLeft="10dp"/>
<TextView
android:id="#+id/edPrice"
android:layout_width="100dp"
android:layout_marginTop="80dp"
android:layout_height="40dp"
android:layout_marginLeft="10dp"/>
<TextView
android:id="#+id/edDisc"
android:layout_width="100dp"
android:layout_height="40dp"
android:layout_marginRight="10dp"
android:layout_marginTop="80dp"
android:layout_marginLeft="10dp"/>
</LinearLayout>
</AbsoluteLayout>
</LinearLayout>
Content_main.xml
<?xml version="1.0" encoding="utf-8"?>
<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="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
tools:context="com.example.user.merchant.MainActivity"
tools:showIn="#layout/app_bar_main">
<ListView
android:id="#+id/list"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:dividerHeight="10dp">
</ListView>
<SearchView
android:id="#+id/search_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
</SearchView>
</RelativeLayout>
AppController.java
public class AppController extends Application {
public static final String TAG = AppController.class.getSimpleName();
private RequestQueue mRequestQueue;
// private ImageLoader mImageLoader;
private static AppController mInstance;
#Override
public void onCreate() {
super.onCreate();
mInstance = this;
}
public static synchronized AppController getInstance() {
return mInstance;
}
public RequestQueue getRequestQueue() {
if (mRequestQueue == null) {
mRequestQueue = Volley.newRequestQueue(getApplicationContext());
}
return mRequestQueue;
}
public <T> void addToRequestQueue(Request<T> req, String tag) {
// set the default tag if tag is empty
req.setTag(TextUtils.isEmpty(tag) ? TAG : tag);
getRequestQueue().add(req);
}
public <T> void addToRequestQueue(Request<T> req) {
req.setTag(TAG);
getRequestQueue().add(req);
}
public void cancelPendingRequests(Object tag) {
if (mRequestQueue != null) {
mRequestQueue.cancelAll(tag);
}
}
}
CustomListAdapter.java
public class CustomListAdapter extends BaseAdapter implements Filterable {
private Activity activity;
CustomFilter filter;
private LayoutInflater inflater;
private List<InventoryModel> InventoryModelItems;
private List<InventoryModel> filterList;
public CustomListAdapter(Activity activity, List<InventoryModel> InventoryModelItems) {
this.activity = activity;
this.InventoryModelItems = InventoryModelItems;
this.filterList=InventoryModelItems;
}
#Override
public int getCount() {
return InventoryModelItems.size();
}
#Override
public Object getItem(int location) {
return InventoryModelItems.get(location);
}
#Override
public long getItemId(int position) {
return position;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
if (inflater == null)
inflater = (LayoutInflater) activity
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
if (convertView == null)
convertView = inflater.inflate(R.layout.mylist, null);
TextView ItemName = (TextView) convertView.findViewById(R.id.edItem);
TextView Unit = (TextView) convertView.findViewById(R.id.edUnit);
TextView Price = (TextView) convertView.findViewById(R.id.edPrice);
TextView Discount = (TextView) convertView.findViewById(R.id.edDisc);
// getting InventoryModel data for the row
InventoryModel m = InventoryModelItems.get(position);
// thumbnail image
// title
ItemName.setText(m.getItemName());
// rating
Unit.setText("Unit: " + (m.getUnit()));
// release year
Price.setText("Rs: " + String.valueOf(m.getPrice()));
Discount.setText("Discount: " + String.valueOf(m.getUnit()));
return convertView;
}
#Override
public Filter getFilter() {
if(filter==null)
{
filter=new CustomFilter();
}
return filter;
}
class CustomFilter extends Filter
{
#Override
protected FilterResults performFiltering(CharSequence constraint) {
FilterResults results=new FilterResults();
if(constraint != null&&constraint.length()>0)
{
constraint=constraint.toString().toUpperCase();
ArrayList<InventoryModel> filters=new ArrayList<InventoryModel>();
for(int i=0;i<filterList.size();i++)
{
if(filterList.get(i).getItemName().toUpperCase().contains(constraint))
{
InventoryModel p= new InventoryModel(filterList.get(i).getItemName(),filterList.get(i).getUnit(),filterList.get(i).getPrice(),filterList.get(i).getDiscount());
filters.add(p);
}
}
results.count=filters.size();
results.values=filters;
}
else
{
results.count=filterList.size();
results.values=filterList;
}
return results;
}
#Override
protected void publishResults(CharSequence constraint, FilterResults results) {
InventoryModelItems=(List<InventoryModel>) results.values;
notifyDataSetChanged();
}
}
}
mainactivity.java
public class MainActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
private static final String TAG = MainActivity.class.getSimpleName();
private static final String url = "url";
private ProgressDialog pDialog;
private List<InventoryModel> InventoryModelList = new ArrayList<InventoryModel>();
private ListView listView;
private CustomListAdapter adapter;
public TextView test;
SearchView inputSearch;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listView=(ListView)findViewById(R.id.list);
adapter = new CustomListAdapter(this, InventoryModelList);
listView.setAdapter(adapter);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
//toolbar.setLogo(R.drawable.ic_menu_slideshow);
//toolbar.setNavigationIcon(getResources().getDrawable(R.drawable.ic_menu_slideshow));
// test=(TextView)findViewById(R.id.listtest);
setSupportActionBar(toolbar);
pDialog = new ProgressDialog(this);
// Showing progress dialog before making http request
pDialog.setMessage("Loading...");
pDialog.show();
// changing action bar color
assert getSupportActionBar() != null;
getSupportActionBar().setBackgroundDrawable(
new ColorDrawable(Color.parseColor("#1b1b1b")));
JsonArrayRequest InventoryModelReq = new JsonArrayRequest(url,
new Response.Listener<JSONArray>() {
#Override
public void onResponse(JSONArray response) {
// test.setText(response);
Log.d(TAG, response.toString());
hidePDialog();
// Parsing json
for (int i = 0; i < response.length(); i++) {
try {
JSONObject obj = response.getJSONObject(i);
InventoryModel InventoryModel = new InventoryModel();
InventoryModel.setItemName(obj.getString("Item_Name"));
InventoryModel.setUnit(obj.getString("Unit"));
InventoryModel.setPrice(((Number) obj.get("Price"))
.floatValue());
InventoryModel.setDiscount(((Number) obj.get("Discount")).floatValue());
// adding InventoryModel to InventoryModels array
InventoryModelList.add(InventoryModel);
} catch (JSONException e) {
e.printStackTrace();
}
}
// notifying list adapter about data changes
// so that it renders the list view with updated data
adapter.notifyDataSetChanged();
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d(TAG, "Error: " + error.getMessage());
hidePDialog();
}
});
AppController.getInstance().addToRequestQueue(InventoryModelReq);
/* toolbar.setNavigationOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intenthome = new Intent(MainActivity.this, MainActivity.class);
startActivity(intenthome);
}
});*/
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent intentfloat = new Intent(MainActivity.this, ItemAdd.class);
startActivity(intentfloat);
}
});
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
//toggle.setHomeAsUpIndicator(R.drawable.ic_menu_slideshow);
drawer.setDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
}
#Override
public void onBackPressed() {
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
} else {
super.onBackPressed();
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
#Override
public void onDestroy() {
super.onDestroy();
hidePDialog();
}
private void hidePDialog() {
if (pDialog != null) {
pDialog.dismiss();
pDialog = null;
}
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if(id == R.id.account) {
Intent intentaccount = new Intent(MainActivity.this, account.class);
startActivity(intentaccount);
}
if (id == R.id.action_settings) {
return true;
}
if(id==R.id.action_notify) {
Intent intentNotify = new Intent(MainActivity.this, Notification.class);
startActivity(intentNotify);
}
return super.onOptionsItemSelected(item);
}
#SuppressWarnings("StatementWithEmptyBody")
#Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId();
if (id == R.id.nav_processing) {
// Handle the camera action
Intent intentProcessing = new Intent(MainActivity.this, ProcessingItem.class);
startActivity(intentProcessing);
} else if (id == R.id.nav_processed) {
Intent intentProcessed = new Intent(MainActivity.this, ProcessedItem.class);
startActivity(intentProcessed);
} else if (id == R.id.nav_Aborted) {
Intent intentAborted = new Intent(MainActivity.this, AbortedIem.class);
startActivity(intentAborted);
} else if (id == R.id.nav_delivery) {
Intent intentDelivered = new Intent(MainActivity.this, DeliveredItem.class);
startActivity(intentDelivered);
}
else if (id == R.id.logout)
{
// private void logout(){
//Creating an alert dialog to confirm logout
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(this);
alertDialogBuilder.setMessage("Are you sure you want to logout?");
alertDialogBuilder.setPositiveButton("Yes",
new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface arg0, int arg1) {
//Getting out sharedpreferences
SharedPreferences preferences = getSharedPreferences(config.SHARED_PREF_NAME, Context.MODE_PRIVATE);
//Getting editor
SharedPreferences.Editor editor = preferences.edit();
//Puting the value false for loggedin
editor.putBoolean(config.LOGGEDIN_SHARED_PREF, false);
//Putting blank value to email
editor.putString(config.EMAIL_SHARED_PREF, "");
//Saving the sharedpreferences
editor.commit();
//Starting login activity
Intent intent = new Intent(MainActivity.this, LoginActivityMerchant.class);
startActivity(intent);
}
});
alertDialogBuilder.setNegativeButton("No",
new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface arg0, int arg1) {
}
});
//Showing the alert dialog
AlertDialog alertDialog = alertDialogBuilder.create();
alertDialog.show();
}
else if (id == R.id.nav_share) {
} else if (id == R.id.nav_send) {
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
}

Android piechart in custom fragment

I want to display pie-chart in a fragment dialog box..
This is the code:--
MainActivity.java
public class MainActivity extends Activity implements
MyDialogFragment.Communicator {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
#SuppressLint("NewApi")
public void showDialog(View view) {
FragmentManager manager = getFragmentManager();
MyDialogFragment1 mydialog = new MyDialogFragment1();
mydialog.show(manager, "mydialog");
}
#Override
public void message(String data) {
Toast.makeText(getApplicationContext(), data + " button clicked",
Toast.LENGTH_SHORT).show();
}
}
and the MyDialogFragment1.java
#SuppressLint({ "NewApi", "InflateParams" })
public class MyDialogFragment1 extends DialogFragment implements OnClickListener {
Button no_button;
Context context;
private static int[] COLORS = new int[] { Color.MAGENTA, Color.CYAN };
private static String[] NAME_LIST = new String[] { "A", "B" };
private CategorySeries mSeries = new CategorySeries("");
private DefaultRenderer mRenderer = new DefaultRenderer();
private GraphicalView mChartView;
private int[] VALUES = { 40, 60 };
Communicator communicator;
#SuppressLint("NewApi")
#Override
public void onAttach(Activity activity) {
super.onAttach(activity);
if (activity instanceof Communicator) {
communicator = (Communicator) getActivity();
} else {
throw new ClassCastException(activity.toString()
+ " must implemenet MyListFragment.communicator");
}
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
setCancelable(false);
getDialog().setTitle("Title");
// View view = inflater.inflate(R.layout.main, null, false);
View view = (LinearLayout) inflater.inflate(R.layout.main,container, false);
mRenderer.setApplyBackgroundColor(true);
mRenderer.setBackgroundColor(Color.argb(100, 50, 50, 50));
mRenderer.setChartTitleTextSize(20);
mRenderer.setLabelsTextSize(15);
mRenderer.setLegendTextSize(15);
mRenderer.setMargins(new int[] { 20, 30, 15, 0 });
mRenderer.setZoomButtonsVisible(true);
mRenderer.setStartAngle(90);
for (int i = 0; i < VALUES.length; i++) {
//mSeries.add(NAME_LIST[i] + " " + VALUES[i], VALUES[i]);
mSeries.add(NAME_LIST[i] + "(" + VALUES[i]+"%)", VALUES[i]);
SimpleSeriesRenderer renderer = new SimpleSeriesRenderer();
renderer.setColor(COLORS[(mSeries.getItemCount() - 1) % COLORS.length]);
mRenderer.addSeriesRenderer(renderer);
}
if (mChartView != null) {
mChartView.repaint();
}
//yes_button = (Button) view.findViewById(R.id.yesbtn);
no_button = (Button) view.findViewById(R.id.nobtn);
// setting onclick listener for buttons
// yes_button.setOnClickListener(this);
no_button.setOnClickListener(this);
return view;
}
#SuppressLint("ShowToast")
#Override
public void onResume() {
super.onResume();
if (mChartView == null) {
LinearLayout layout = (LinearLayout) findViewById(R.id.chart);
mChartView = ChartFactory.getPieChartView(context, mSeries, mRenderer ) ;
mRenderer.setClickEnabled(true);
mRenderer.setSelectableBuffer(10);
mChartView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
SeriesSelection seriesSelection = mChartView.getCurrentSeriesAndPoint();
}
});
mChartView.setOnLongClickListener(new View.OnLongClickListener() {
#SuppressLint("ShowToast")
#Override
public boolean onLongClick(View v) {
SeriesSelection seriesSelection = mChartView.getCurrentSeriesAndPoint();
return false;
}
});
layout.addView(mChartView, new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
}
else {
mChartView.repaint();
}
}
private LinearLayout findViewById(int chart) {
// TODO Auto-generated method stub
return null;
}
#Override
public void onClick(View view) {
switch (view.getId()) {
case R.id.nobtn :
dismiss();
communicator.message("Dialog No btn clicked");
break;
}
}
public interface Communicator {
public void message(String data);
}
}
and the xml files are:--
activity_main.xml
<LinearLayout
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"
android:orientation="vertical"
android:padding="20dp" >
<Button
android:id="#+id/button1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:onClick="showDialog"
android:text="Show Dialog" />
</LinearLayout>
and main.xml is :--
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<LinearLayout
android:id="#+id/chart"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:orientation="horizontal" >
</LinearLayout>
<Button
android:id="#+id/nobtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="#+id/yesbtn"
android:layout_alignBottom="#+id/yesbtn"
android:layout_alignRight="#+id/textView1"
android:layout_marginRight="38dp"
android:text="No" />
</LinearLayout>
Now, When I run this program it shows the button,when I click the button it stops...
and showing the following error:--
FATAL EXCEPTION: main
Process: com.emple.dialog_android_example, PID: 21181
java.lang.ClassCastException: com.emple.dialog_android_example.MainActivity#41ef95b0 must implemenet MyListFragment.communicator
at com.emple.dialog_android_example.MyDialogFragment1.onAttach(MyDialogFragment1.java:64)
at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:849)
at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1062)
at android.app.BackStackRecord.run(BackStackRecord.java:698)
at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1447)
at android.app.FragmentManagerImpl$1.run(FragmentManager.java:443)
at android.os.Handler.handleCallback(Handler.java:808)
at android.os.Handler.dispatchMessage(Handler.java:103)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:5324)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:824)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:640)
at dalvik.system.NativeStart.main(Native Method)
where is the problem????

I think your activity is not a instance of Communicator
Check here :
#SuppressLint("NewApi")
#Override
public void onAttach(Activity activity) {
super.onAttach(activity);
if (activity instanceof Communicator) {
communicator = (Communicator) getActivity();
} else {
throw new ClassCastException(activity.toString()
+ " must implemenet MyListFragment.communicator");
}
}