Android screen lock when just click on app icon

Question

i want to create app in that when i click on my app icon , screen autmatically locked, please any one help me to how to do this ?

I much googling but not find like this, so please help me to do it.

In this i click on app_launcher icon and directly mobile screen locked.

Answer 1

Try this code (lock screen and screen off):

public DevicePolicyManager deviceAdminPolicyManager = (DevicePolicyManager)getSystemService( Context.DEVICE_POLICY_SERVICE);
public ComponentName deviceAdminComponentName = new ComponentName( this, DeviceAdmin.class);

deviceAdminPolicyManager.lockNow();
PowerManager powerManager = (PowerManager) getSystemService( Context.POWER_SERVICE);
if( powerManager.isScreenOn()) powerManager.goToSleep( System.currentTimeMillis() + 1000L);

Your app must be added as device administrator by Settings - Security - Device administartors.

Also add in Manifest:

<uses-permission android:name="android.permission.DISABLE_KEYGUARD" />
<uses-permission android:name="android.permission.DEVICE_POWER"/> <!-- for screen off and on -->
<uses-permission android:name="android.permission.WAKE_LOCK"/>

 <receiver android:label="@string/label" android:name="com.package$DeviceAdmin" android:permission="android.permission.BIND_DEVICE_ADMIN">
  <meta-data android:name="android.app.device_admin" android:resource="@xml/device_admin" />
  <intent-filter>
   <action android:name="android.app.action.DEVICE_ADMIN_ENABLED" />
  </intent-filter>
 </receiver>

And:

public  static class DeviceAdmin extends DeviceAdminReceiver
 {
   public CharSequence onDisableRequested( Context paramContext, Intent paramIntent) { return ""; }
   public void onDisabled( Context paramContext, Intent paramIntent) {}
   public void onEnabled( Context paramContext, Intent paramIntent) {}
   public void onPasswordChanged( Context paramContext, Intent paramIntent) {}
 }

DeviceAdmin.xml

<?xml version="1.0" encoding="utf-8"?>
<device-admin xmlns:android="http://schemas.android.com/apk/res/android">
 <uses-policies>
  <force-lock />
 </uses-policies>
</device-admin>