How to unlock the Android Phone programmatically? | Code for start another activity when phone screen is lock | Alarm Manager in Android | Play Alarm in Android on scheduled time

Hello Friends,

I am Going to share very important and useful code for start your application when phone is lock. This demo will unlock your phone lock and start another activity class form first screen.

For this I am using Alarm manager which will start your application after every 10 second.

Intent intent = new Intent(this, NextActivity.class);
  PendingIntent pendingIntent = PendingIntent.getActivity(this, 12345,
    intent, PendingIntent.FLAG_CANCEL_CURRENT);
  AlarmManager am = (AlarmManager) getSystemService(Activity.ALARM_SERVICE);
  /**
   * if you want start your application only one time un-comment below
   * line code and comment next line code
   */
  // am.set(AlarmManager.RTC_WAKEUP, cal.getTimeInMillis(), pendingIntent);
  am.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis(),
    1000 * 15, pendingIntent); 

And this is the code which will unlock your phone lock-
 

KeyguardManager km = (KeyguardManager) context
     .getSystemService(Context.KEYGUARD_SERVICE);
   final KeyguardManager.KeyguardLock kl = km
     .newKeyguardLock("MyKeyguardLock");
   kl.disableKeyguard();

   PowerManager pm = (PowerManager) context
     .getSystemService(Context.POWER_SERVICE);
   WakeLock wakeLock = pm.newWakeLock(PowerManager.FULL_WAKE_LOCK
     | PowerManager.ACQUIRE_CAUSES_WAKEUP
     | PowerManager.ON_AFTER_RELEASE, "MyWakeLock");
   wakeLock.acquire(); 

Full code

 

(A)MainActivity.java

package com.manish.nevigationapp;

import android.app.Activity;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.Intent;
import android.os.Bundle;
import android.widget.TextView;

public class MainActivity extends Activity {
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  TextView text = (TextView) findViewById(R.id.textView1);
  text.setText("First Page");

  // Create a new PendingIntent and add it to the AlarmManager
  Intent intent = new Intent(this, NextActivity.class);
  PendingIntent pendingIntent = PendingIntent.getActivity(this, 12345,
    intent, PendingIntent.FLAG_CANCEL_CURRENT);
  AlarmManager am = (AlarmManager) getSystemService(Activity.ALARM_SERVICE);
  /**
   * if you want start your application only one time un-comment below
   * line code and comment next line code
   */
  // am.set(AlarmManager.RTC_WAKEUP, cal.getTimeInMillis(), pendingIntent);
  am.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis(),
    1000 * 15, pendingIntent);
 }

} 

(B)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:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:text="Large Text"
        android:textAppearance="?android:attr/textAppearanceLarge" />

</RelativeLayout> 

(C)NextActivity.java

package com.manish.nevigationapp;

import java.io.IOException;

import android.app.Activity;
import android.app.KeyguardManager;
import android.content.Context;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.media.RingtoneManager;
import android.net.Uri;
import android.os.Bundle;
import android.os.PowerManager;
import android.os.PowerManager.WakeLock;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.widget.Button;

public class NextActivity extends Activity {
 private MediaPlayer mPlayer;

 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);

  setContentView(R.layout.activity_next);

  Button stopAlarm = (Button) findViewById(R.id.stopAlarm);
  stopAlarm.setOnTouchListener(new OnTouchListener() {
   public boolean onTouch(View arg0, MotionEvent arg1) {
    mPlayer.stop();
    finish();
    return false;
   }
  });

  playSound(this, getAlarmUri());
 }

 private void playSound(Context context, Uri alert) {
  mPlayer = new MediaPlayer();
  try {
   // unlock screen
   KeyguardManager km = (KeyguardManager) context
     .getSystemService(Context.KEYGUARD_SERVICE);
   final KeyguardManager.KeyguardLock kl = km
     .newKeyguardLock("MyKeyguardLock");
   kl.disableKeyguard();

   PowerManager pm = (PowerManager) context
     .getSystemService(Context.POWER_SERVICE);
   WakeLock wakeLock = pm.newWakeLock(PowerManager.FULL_WAKE_LOCK
     | PowerManager.ACQUIRE_CAUSES_WAKEUP
     | PowerManager.ON_AFTER_RELEASE, "MyWakeLock");
   wakeLock.acquire();
   // start alarm
   mPlayer.setDataSource(context, alert);
   final AudioManager audioManager = (AudioManager) context
     .getSystemService(Context.AUDIO_SERVICE);
   if (audioManager.getStreamVolume(AudioManager.STREAM_ALARM) != 0) {
    mPlayer.setAudioStreamType(AudioManager.STREAM_ALARM);
    mPlayer.prepare();
    mPlayer.start();
   }
  } catch (IOException e) {
   System.out.println("Unable to play!");
  }
 }

 // Get an alarm sound.

 private Uri getAlarmUri() {
  Uri alert = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_ALARM);
  if (alert == null) {
   alert = RingtoneManager
     .getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
   if (alert == null) {
    alert = RingtoneManager
      .getDefaultUri(RingtoneManager.TYPE_RINGTONE);
   }
  }
  return alert;
 }
} 

(D)activity_next.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical"
    android:gravity="center" >
 
    <Button
        android:id="@+id/stopAlarm"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="stop alarm" />
 
</RelativeLayout> 

(E)AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.manish.nevigationapp"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />

    <uses-permission android:name="android.permission.DISABLE_KEYGUARD" />
    <uses-permission android:name="android.permission.WAKE_LOCK" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.manish.nevigationapp.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name="com.manish.nevigationapp.NextActivity" />
    </application>

</manifest> 

Thanks!
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