How to use AlertDialog Builder 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="#d2d452"     >     <Button         android:id="@+id/btn"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="Change Background Color"         /> </RelativeLayout>
MainActivity.java 
 package com.cfsuman.me.androidcodesnippets;  import android.app.AlertDialog; import android.content.DialogInterface; import android.graphics.Color; import android.os.Bundle; import android.app.Activity; import android.view.View; import android.widget.Button; import android.widget.RelativeLayout; import android.widget.Toast;   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         simpulan RelativeLayout rl = (RelativeLayout) findViewById(R.id.rl);         Button btn = (Button) findViewById(R.id.btn);          btn.setOnClickListener(new View.OnClickListener() {             @Override             public void onClick(View v) {                 // Build an AlertDialog                 /*                     AlertDialog.Builder(Context context)                         Constructor using a context for this builder                         and the AlertDialog it creates.                  */                 AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);                  // Set a message/question for alert dialog                 /*                     AlertDialog.Builder setMessage(CharSequence message)                         Set the message to display.                  */                 builder.setMessage("Want to change the background color?");                  // Specify the dialog is not cancelable                 /*                     AlertDialog.Builder setCancelable(boolean cancelable)                         Sets whether the dialog is cancelable or not.                  */                 builder.setCancelable(false);                  // Set a title for alert dialog                 /*                     AlertDialog.Builder setTitle(CharSequence title)                         Set the title displayed in the Dialog.                  */                 builder.setTitle("Title of AlertDialog.");                  // Set the positive/yes button click click listener                 /*                     AlertDialog.Builder setPositiveButton(CharSequence text,                     DialogInterface.OnClickListener listener)                         Set a listener to be invoked when the positive button of the dialog is pressed.                  */                 builder.setPositiveButton("Yes", new DialogInterface.OnClickListener() {                     @Override                     public void onClick(DialogInterface dialog, int which) {                         // Do something when click positive button                         rl.setBackgroundColor(Color.parseColor("#FF60D4A4"));                         Toast.makeText(getApplicationContext(),                                 "Color Changed",Toast.LENGTH_SHORT).show();                     }                 });                  // Set the negative/no button click click listener                 /*                     AlertDialog.Builder setNegativeButton(CharSequence text,                     DialogInterface.OnClickListener listener)                         Set a listener to be invoked when the negative button of the dialog is pressed.                  */                 builder.setNegativeButton("No", new DialogInterface.OnClickListener() {                     @Override                     public void onClick(DialogInterface dialog, int which) {                         // Do something when click the negative button                         Toast.makeText(getApplicationContext(),                                 "No Button Clicked",Toast.LENGTH_SHORT).show();                     }                 });                  AlertDialog dialog = builder.create();                 // Display the alert dialog on interface                 dialog.show();             }         });     } }



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