How to Set Ringer Mode, Vibrate Mode & Silent Mode Through AudioManager in Android

Procedure

1. Start the Eclipse IDE.
2. Make an activity MainActivity.java.
3. Make a XML file activity_main.xml.
4. In XML file,3 Buttons should be there.
5. The code is given below.

MainActivity.java

package com.example.setringer;
import android.media.AudioManager;
import android.os.Bundle;
import android.provider.MediaStore.Audio;
import android.app.Activity;
import android.content.Context;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class MainActivity extends Activity {
 Button b1, b2, b3;
 AudioManager am;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  b1 = (Button) findViewById(R.id.button1);
  b2 = (Button) findViewById(R.id.button2);
  b3 = (Button) findViewById(R.id.button3);
  am = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
  b1.setOnClickListener(new OnClickListener() {
   @Override
   public void onClick(View v) {
    am.setRingerMode(0);
   }
  });
  b2.setOnClickListener(new OnClickListener() {
   @Override
   public void onClick(View v) {
    am.setRingerMode(1);
   }
  });
  b3.setOnClickListener(new OnClickListener() {
   @Override
   public void onClick(View v) {
    am.setRingerMode(3);
   }
  });
 }
}

Activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/textView1"
        android:layout_marginTop="78dp"
        android:layout_toRightOf="@+id/textView1"
        android:text="silent" />

    <Button
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/button1"
        android:layout_centerVertical="true"
        android:text="vibrate" />

    <Button
        android:id="@+id/button3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/button2"
        android:layout_below="@+id/button2"
        android:layout_marginTop="30dp"
        android:text="ringer" />

</RelativeLayout>

Output