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Android Google GCM - Is it possible to display alert when device is in sleep mode with security enabled?
<uses-permission android:name="android.permission.WAKE_LOCK" />
<uses-permission android:name="android.permission.DISABLE_KEYGUARD"/>

import android.app.KeyguardManager;
import android.os.PowerManager;
import android.view.WindowManager;

// ...

private KeyguardManager.KeyguardLock mKeyguardLock;

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

    // ...

    KeyguardManager km = (KeyguardManager) getSystemService(KEYGUARD_SERVICE);
    mKeyguardLock = km.newKeyguardLock(ClassName);
    mKeyguardLock.disableKeyguard();

    PowerManager pm = (PowerManager) getSystemService(POWER_SERVICE);
    PowerManager.WakeLock wl = pm.newWakeLock(
            PowerManager.ACQUIRE_CAUSES_WAKEUP
                    | PowerManager.FULL_WAKE_LOCK, ClassName);
    wl.acquire();

    getWindow().addFlags(
            WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON
                    | WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD
                    | WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED
                    | WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON);
}// onCreate()

@Override
protected void onDestroy() {
    super.onDestroy();
    mKeyguardLock.reenableKeyguard();
}// onDestroy()