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Lock/unlock android phone programatically


Lock and unlock phone in android programmatically/ Lock phone using power manager/wave lock in android/Turn screen off in android/Display screen off in android

To turn screen on in android, use the code below

powermanager=  ((PowerManager)context.getSystemService(Context.POWER_SERVICE));
                  wakeLock=powermanager.newWakeLock(PowerManager.SCREEN_BRIGHT_WAKE_LOCK | PowerManager.ACQUIRE_CAUSES_WAKEUP, "tag");
            wakeLock.acquire();



To lock or to turn off display screen off, use the code below

      if(wakeLock.isHeld())
            {
                  wakeLock.release();
            }
Also set permission in Android manifest file 
<uses-permission android:name="android.permission.WAKE_LOCK"/>
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