How to Create a Popup Window (Popupwindow) in Android

How to create a popup window (PopupWindow) in Android

Here, I am giving you a demo example. See this and customize it according to your need.

public class ShowPopUp extends Activity {
    PopupWindow popUp;
    boolean click = true;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        popUp = new PopupWindow(this);
        LinearLayout layout = new LinearLayout(this);
        LinearLayout mainLayout = new LinearLayout(this);
        TextView tv = new TextView(this);
        Button but = new Button(this);
        but.setText("Click Me");
        but.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                if (click) {
                     popUp.showAtLocation(layout, Gravity.BOTTOM, 10, 10);
                     popUp.update(50, 50, 300, 80);
                     click = false;
                } else {
                     popUp.dismiss();
                     click = true;
                }
            }
        });

        LayoutParams params = new LayoutParams(LayoutParams.WRAP_CONTENT,
            LayoutParams.WRAP_CONTENT);
        layout.setOrientation(LinearLayout.VERTICAL);
        tv.setText("Hi this is a sample text for popup window");
        layout.addView(tv, params);
        popUp.setContentView(layout);
        // popUp.showAtLocation(layout, Gravity.BOTTOM, 10, 10);
        mainLayout.addView(but, params);
        setContentView(mainLayout);
   }
}

Hope this will solve your issue.

Create a popup window with a next button when a user gives the right answer to my question in the quiz

The issue is in the following line

Button btn = findViewById(R.id.button3);

As you are inflating a popupwindow and inside that R.id.button3 is there. So parent of R.id.button3is popupwindow. The view initialization should look like below

View popupView = inflater.inflate(R.layout.popup_window, null);
Button btn = popupView.findViewById(R.id.button3);

How to create auto popup window in android studio

public void openDialog(View view){
  AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(this);
  alertDialogBuilder.setMessage("Are you sure,You wanted to make decision");

  alertDialogBuilder.setPositiveButton("yes", new DialogInterface.OnClickListener() {
     @Override
     public void onClick(DialogInterface arg0, int arg1) {
        Toast.makeText(MainActivity.this,"You clicked yes button",Toast.LENGTH_LONG).show();
     }
  });

  alertDialogBuilder.setNegativeButton("No",new DialogInterface.OnClickListener() {
     @Override
     public void onClick(DialogInterface dialog, int which) {
        finish();
     }
  });

  AlertDialog alertDialog = alertDialogBuilder.create();
  alertDialog.show();

}

Just call this method openDialog(); after your setContentView(R.layout.activity_main);
Example

setContentView(R.layout.activity_main);
openDialog();

How to create PopupWindow on startup in android?

this is how you may show a popup window.

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_height="fill_parent" 
    android:layout_width="fill_parent"
    android:orientation="vertical"
    android:id="@+id/layoutTemp">

</LinearLayout>

popup_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:padding="10dip"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:background="#FFFFFF">

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dip"
        android:text="Test Pop-Up" />

</LinearLayout>

main.java

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    new Handler().postDelayed(new Runnable() {
        public void run() {
            showPopup();
        }
    }, 100);
}

public void showPopup(){
    LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);

    PopupWindow pw = new PopupWindow(inflater.inflate(R.layout.popup_layout, null, false), 100, 100, true);
    pw.showAtLocation(findViewById(R.id.layoutTemp), Gravity.CENTER, 0, 0);
}

The idea is that your popup will be displayed once your activity is loaded, otherwise it will produce exception Unable to add window -- token null is not valid; is your activity running?. Unless you show popup on a button click, that is the reason I'm showing it after a delay of 100 milliseconds (which is almost unnoticeable).

Problems creating a Popup Window in Android Activity

To avoid BadTokenException, you need to defer showing the popup until after all the lifecycle methods are called (-> activity window is displayed):

 findViewById(R.id.main_page_layout).post(new Runnable() {
   public void run() {
     pw.showAtLocation(findViewById(R.id.main_page_layout), Gravity.CENTER, 0, 0);
   }
});

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