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how do i add a pop up buble on a fragment? [closed]

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hello i have a issue i can't put a pop up on a fragment in android studio
here's the code i try to use , the thing i try is to add a pop up to my fragment that when i click on a button a pop up show and show some text in it tho i tried to add a working code in the fargemnt it just dont work
public class fragment2 extends Fragment {
#Nullable
#Override
public View onCreateView(#NonNull LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment2_layout,container,false);
}
private Activity ControllerCompat;
android.widget.Button Bouton1;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment2_layout);
Bouton1 = (android.widget.Button) findViewById(R.id.button1);
Bouton1.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
AlertDialog.Builder alert = new AlertDialog.Builder(fragment2.this);
alert.setTitle("voici les boutons");
alert.setPositiveButton("yes ", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
}
});
alert.setNegativeButton("no", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
}
});
alert.show();
}
});
}
}

like this? if yes then i have an error on the buuton1 saying that he cant resolve symbol "bouton 1"
`public class fragment2 extends Fragment {
#Nullable
#Override
public View onCreateView(#NonNull LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment2_layout, container, false);
buton1.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(getContext());
alertDialogBuilder.setTitle("Title");
alertDialogBuilder.setMessage("Message");
alertDialogBuilder.setCancelable(true);
alertDialogBuilder.setPositiveButton("yes", (dialog, id) ->
{
}
);
alertDialogBuilder.setNegativeButton("no", (dialog, id) -> dialog.cancel());
AlertDialog myAlertDialog = alertDialogBuilder.create();
myAlertDialog.show();
}
});
}
}
`

Initialize your buton first
Bouton1 = (android.widget.Button) findViewById(R.id.button1);
Bouton1.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(getContext());
alertDialogBuilder.setTitle("Title");
alertDialogBuilder.setMessage("Message");
alertDialogBuilder.setCancelable(true);
alertDialogBuilder.setPositiveButton("yes", (dialog, id) ->
{
}
);
alertDialogBuilder.setNegativeButton("no", (dialog, id) -> dialog.cancel());
AlertDialog myAlertDialog = alertDialogBuilder.create();
myAlertDialog.show();
}
});

Communication Between DialogFragment and Fragment

I am trying to pass information from my alert dialog to my second fragment (I am using tabbed activity layout).
I want to pass information from alert dialog to fragment when I click on my ImageView, but my app keep crashing until I implement my interface inside MainActivity.java. My main mission here is to open alert dialog which contains several buttons. When I click first button I want to print "Test br 3" but it does not work inside my Fragment, it only works inside my MainActivity.java where method prints "Test br 2".
My Main Activity
public class MainActivity extends AppCompatActivity implements ExercisesAlertDialog.DataTransfer {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
SectionsPagerAdapter sectionsPagerAdapter = new SectionsPagerAdapter(this, getSupportFragmentManager());
ViewPager viewPager = findViewById(R.id.view_pager);
viewPager.setAdapter(sectionsPagerAdapter);
TabLayout tabs = findViewById(R.id.tabs);
tabs.setupWithViewPager(viewPager);
}
#Override
public void ApplyData() {
System.out.println("Test br 2");
}
My Fragment
public class Frag2 extends Fragment implements ExercisesAlertDialog.DataTransfer {
ImageView plusbtn;
#Nullable
#Override
public View onCreateView(#NonNull LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.frag2, container, false);
plusbtn = (ImageView) v.findViewById(R.id.plusbtn);
plusbtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
ExercisesDialog();
}
});
return v;
}
public void ExercisesDialog()
{
ExercisesAlertDialog exercisesAlertDialog = new ExercisesAlertDialog();
exercisesAlertDialog.show(getFragmentManager(), "Exercises Dialog");
}
#Override
public void ApplyData() {
System.out.println("Test br 3");
}
My Alert Dialog
public class ExercisesAlertDialog extends AppCompatDialogFragment {
ImageButton one, two;
private DataTransfer listener;
public int first;
#Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
final AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
LayoutInflater inflater = getActivity().getLayoutInflater();
View v = inflater.inflate(R.layout.workout_custom_menu, null);
builder.setView(v);
builder.setTitle("Choose your Workout");
builder.setPositiveButton("Cancel", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
dismiss();
}
});
one = (ImageButton) v.findViewById(R.id.first);
two = (ImageButton) v.findViewById(R.id.second);
one.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
first = 1;
if(first ==1)
{
listener.ApplyData();
}
}
});
return builder.create();
}
public interface DataTransfer
{
void ApplyData();
}
#Override
public void onAttach(Context context) {
super.onAttach(context);
try {
listener = (DataTransfer) context;
}
catch (ClassCastException e)
{
throw new ClassCastException(toString() + "Must implement DataTransfer");
}
}
}

I changed getChildFragmentManager() instead of getFragmentManager() in the show() call. Second thing is onAttach() to listener = (DataTransfer) getParentFragment(); instead of context.

void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object referenc [duplicate]

This question already has answers here:
What is a NullPointerException, and how do I fix it?
(12 answers)
Closed 3 years ago.
I have added one button "btn". I have set onclicklistener, inside the button "btn" I have added another button "btnYes" to show display custom dialog when I add these "btnYes" apps get crash.
When I remove the "btnyes" button app is working.
Can we add onclicklistener for two button inside one button for different work?
Java Code
public class MainActivity extends AppCompatActivity {
private Button btn, btnYes, btnNo;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn = findViewById(R.id.click);
btnYes = findViewById(R.id.yes);
btnNo = findViewById(R.id.no);
btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
AlertDialog.Builder dialogBox = new AlertDialog.Builder(MainActivity.this);
LayoutInflater inflater = LayoutInflater.from(MainActivity.this);
View myView = inflater.inflate(R.layout.custom_dialogbox, null);
dialogBox.setView(myView);
final AlertDialog mybuilder = dialogBox.create();
mybuilder.setCancelable(false);
btnYes.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
mybuilder.dismiss();
}
});
}
});
}
}
Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
at com.example.customdialog.MainActivity$1.onClick(MainActivity.java:33)

If btnYes and btnNo are on the dialog, then you should initialize these buttons using the AlertDialog's View object.
You have to modify your code like following.
public class MainActivity extends AppCompatActivity {
private Button btn, btnYes, btnNo;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn = findViewById(R.id.click);
btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
AlertDialog.Builder dialogBox = new AlertDialog.Builder(MainActivity.this);
LayoutInflater inflater = LayoutInflater.from(MainActivity.this);
View myView = inflater.inflate(R.layout.custom_dialogbox, null);
// these button should be initialize here.
btnYes = myView.findViewById(R.id.yes);
btnNo = myView.findViewById(R.id.no);
dialogBox.setView(myView);
final AlertDialog mybuilder = dialogBox.create();
mybuilder.setCancelable(false);
btnYes.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
mybuilder.dismiss();
}
});
}
});
}
}
Hope it helps you.

if you want to display Dialog with choices yes or no, use this
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setMessage(message)
.setCancelable(false)
.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
// action for yes
}
})
.setNegativeButton("No", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
// action for no
}
});
AlertDialog alert = builder.create();
alert.show();
But, if you want to use a custom dialog layout, you should do it like this.
final Dialog dialog = new Dialog(this);
dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
dialog.setContentView(R.layout.YOUR_LAYOUT_HERE);
Button btnyes= dialog.findViewById(R.id.btnyes);
btnyes.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
dialog.cancel();
}
});

Apply the notifyDataSetChanged on stored list in sharedpreferences

I have a problem about my listview i am populating my listview with what the user enters in the dialog box when the add new button is clicked. When this button is clicked a dialog appears and asks the user to input something when the user presses done what he/she enters does not appear in the view from the list even when i put the notifyDataSetChanged. What the user inputs only appear when the fragment has been restarted. I think it may involved the saving in sharedpreferences which is the tinyDB in the code. How do i make sure the notifyDataSetChanged is noticed by the list that is stored. Thank you
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_year_two_my_courses_first_semester, container, false);
btnAddNew = (Button)rootView.findViewById(R.id.btnAddNewYearTwoFirstSemester);
btnSave = (Button)rootView.findViewById(R.id.btnSaveAddedSubjectsFirstSemesterYr2);
listView = (ListView)rootView.findViewById(R.id.listViewSubjectsMyCoursesFirstSemesterYr2);
tinyDB = new TinyDB(getContext());
storedList = new ArrayList<>(tinyDB.getListString("storedList1stYr2"));
storedArray = new ArrayList<>();
generalList = new ArrayList<>();
generalList.addAll(storedArray);
generalList.addAll(storedList);
getActivity().setTitle("Year Two");
setHasOptionsMenu(true);
btnAddNew.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
btnSave.setVisibility(View.VISIBLE);
AlertDialog.Builder alertDialog = new AlertDialog.Builder(getContext(),R.style.DialogeTheme);
// Setting Dialog Title
alertDialog.setTitle("Add new");
// Setting Dialog Message
String getUsername = tinyDB.getString("Username");
alertDialog.setMessage("Hello "+ getUsername + ", please write the new subject");
final EditText input = new EditText(getContext());
LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.MATCH_PARENT,
LinearLayout.LayoutParams.MATCH_PARENT);
input.setLayoutParams(lp);
input.setTextColor(Color.parseColor("#f06292"));
alertDialog.setView(input);
alertDialog.setPositiveButton("Add", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialogInterface, int i) {
String getSubjectInput = input.getText().toString();
storedList.add(getSubjectInput);
tinyDB.putListString("storedList1stYr2", storedList);
arrayAdapter.notifyDataSetChanged();
}
});
alertDialog.setNegativeButton("CANCEL",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
// Showing Alert Message
alertDialog.create();
alertDialog.show();
}
});
arrayAdapter = new CustomListAdapter(getContext(),generalList);
listView.setAdapter(arrayAdapter);
arrayAdapter.notifyDataSetChanged();
return rootView;
}

Your CustomListAdapter is observing generalList, which does not change when you add a new String in storedList.
You could do this :
public void onClick(DialogInterface dialogInterface, int i) {
String getSubjectInput = input.getText().toString();
storedList.add(getSubjectInput);
tinyDB.putListString("storedList1stYr2", storedList);
generalList.add(getSubjectInput);
arrayAdapter.notifyDataSetChanged();
}
or clear and reset your list.

You must call removeView() on the child's parent first with AlertView

I have a alert dialog and i will get text with TextView but When I call it a second time, the app crashes with error:
04-15 19:37:48.433: E/AndroidRuntime(907): java.lang.IllegalStateException:
The specified child already has a parent. You must call removeView() on
the child's parent first.
My Java source:
public class MainActivity extends ActionBarActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final RelativeLayout rLayout = (RelativeLayout) findViewById(R.id.relativeLayout);
Button btn1 = (Button) findViewById(R.id.button1);
final AlertDialog.Builder build = new AlertDialog.Builder(MainActivity.this);
build.setTitle("Ders Adı Giriniz");
final EditText dersAdiGir = new EditText(MainActivity.this);
build.setView(dersAdiGir);
final LinearLayout layoutDers = (LinearLayout) findViewById(R.id.layoutDers);
build.setPositiveButton("Tamam", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
Editable girilenDers = dersAdiGir.getText();
TextView tv1 = new TextView(MainActivity.this);
tv1.setText(girilenDers);
layoutDers.addView(tv1);
dialog.dismiss();
build.create();
}
});
btn1.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
AlertDialog alert = build.create();
alert.show();
}
});
}
}
Please help me, thanks all

You're creating a new instance of the AlertDialog every button click. Create a final AlertDialog outside of the OnClickListener inner class.
Here's the fix:
final AlertDialog alert = build.create();
btn1.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
alert.show();
}
});