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" /> See more Block incoming calls Answer incoming calls Screen off and on in android Disable home button
If you are a beginner , then this blog will help you to dive into the basics.