Alert Dailog in Android

In this tutorial, we show you how to display an alert dailog in Android.
Layout for file for show alert dailog button.

Xml code is below

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" 
    android:orientation="vertical">

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Show Alert Dailog" />

</LinearLayout>


For display alert dailog on button click JAVA code is diaplay below
In this tutorial on positive button click I start new activity.

public class MainActivity extends Activity {
  
 final Context context = this;
 private Button button;
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  button = (Button) findViewById(R.id.button1);
  // add button listener
  button.setOnClickListener(new OnClickListener() {
  @Override
  public void onClick(View arg0) {
   AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(
    context);
   // set title
   alertDialogBuilder.setTitle("Your Title");
   // set dialog message
   alertDialogBuilder
    .setMessage("Alert Dailog!")
    .setCancelable(false)
    .setPositiveButton("Yes",new DialogInterface.OnClickListener() {
     public void onClick(DialogInterface dialog,int id) {
      // if this button is clicked, 
      // DO YOUR CODE HERE

      //Here I start new activity
      Intent i = new Intent(MainActivity.this, abcd.class);
      startActivity(i);
     }
      })
    .setNegativeButton("No",new DialogInterface.OnClickListener() {
     public void onClick(DialogInterface dialog,int id) {
      // if this button is clicked, just close
      // the dialog box and do nothing
      dialog.cancel();
     }
    });
    // create alert dialog
    AlertDialog alertDialog = alertDialogBuilder.create();
    // show it
    alertDialog.show();
   }
  });
 }
}

Happy coding.....