Activity Alarm Do Not Turn On Screen In Sony Xperia P When Alarm Played

My alarm program on Android does not work on many Samsung and HTC devices; it does not turn on the screen and does not play alarm until the screen is manually turned on. This probl

Solution 1:

Try adding this permission to your AndroidManifest.xml:

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