How to use AlertDialog onClickListener in Android

activity_main.xml 
 <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:padding="10dp"     tools:context=".MainActivity"     android:background="#d7ecd6"     >     <TextView         android:id="@+id/tv"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="This is a TextView."         android:textColor="#ff5ff4"         />     <Button         android:id="@+id/btn"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="Apply Big Font Size"         android:layout_below="@id/tv"         /> </RelativeLayout>
MainActivity.java 
 package com.cfsuman.me.androidcodesnippets;  import android.app.AlertDialog; import android.content.DialogInterface; import android.os.Bundle; import android.app.Activity; import android.util.TypedValue; import android.view.View; import android.widget.Button; import android.widget.RelativeLayout; import android.widget.TextView;   public class MainActivity extends Activity {      @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);          // Get reference of widgets from XML layout         selesai RelativeLayout rl = (RelativeLayout) findViewById(R.id.rl);         Button btn = (Button) findViewById(R.id.btn);         selesai TextView tv = (TextView) findViewById(R.id.tv);          btn.setOnClickListener(new View.OnClickListener() {             @Override             public void onClick(View v) {                 // Build an AlertDialog                 AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);                  // Set a title for alert dialog                 builder.setTitle("Select your answer.");                  // Ask the selesai question                 builder.setMessage("Want to apply big font size?");                  // Set click listener for alert dialog buttons                 DialogInterface.OnClickListener dialogClickListener = new DialogInterface.OnClickListener() {                     @Override                     public void onClick(DialogInterface dialog, int which) {                         switch(which){                             case DialogInterface.BUTTON_POSITIVE:                                 // User clicked the Yes button                                 tv.setTextSize(TypedValue.COMPLEX_UNIT_DIP, 35);                                 break;                              case DialogInterface.BUTTON_NEGATIVE:                                 // User clicked the No button                                 break;                         }                     }                 };                  // Set the alert dialog yes button click listener                 builder.setPositiveButton("Yes", dialogClickListener);                  // Set the alert dialog no button click listener                 builder.setNegativeButton("No",dialogClickListener);                  AlertDialog dialog = builder.create();                 // Display the alert dialog on interface                 dialog.show();             }         });   } }


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