android AlarmManager not waking phone up

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I had a similar problem and the solution was to use WakeLocker. That should be done (preferably as the 1st thing in the receiver), or the device will wake up when the alarm is received, but will fall asleep again before context.startActivity(newIntent); is called.
(I have also observed behavior when that does not happen, so it seems to be a bit arbitrary)
So the easy and quick answer:
Make a new class called WakeLocker with this source code:

package mypackage.test;

import android.content.Context;
import android.os.PowerManager;

public abstract class WakeLocker {
    private static PowerManager.WakeLock wakeLock;

    public static void acquire(Context ctx) {
        if (wakeLock != null) wakeLock.release();

        PowerManager pm = (PowerManager) ctx.getSystemService(Context.POWER_SERVICE);
        wakeLock = pm.newWakeLock(PowerManager.FULL_WAKE_LOCK |
                PowerManager.ACQUIRE_CAUSES_WAKEUP |
                PowerManager.ON_AFTER_RELEASE, MainActivity.APP_TAG);
        wakeLock.acquire();
    }

    public static void release() {
        if (wakeLock != null) wakeLock.release(); wakeLock = null;
    }
}

and in your receiver call WakeLocker.acquire(context); as the 1st thing.
Extra: it would also be neat to call WakeLocker.release(); once your alarm has done its thing.

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