android service不被kill的方法

	private ActivityManager activityManager;

activityManager = (ActivityManager) mcontext.getSystemService(Context.ACTIVITY_SERVICE);

IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_OFF);
filter.addAction(Intent.ACTION_SCREEN_ON);
registerReceiver(mBatInfoReceiver, filter);

private final BroadcastReceiver mBatInfoReceiver = new BroadcastReceiver() {
@Override
public void onReceive(final Context context, final Intent intent) {
final String action = intent.getAction();
if (Intent.ACTION_SCREEN_OFF.equals(action)) {
activityManager.moveTaskToFront(Activity（你的activity）).getTaskId(), 1);
} else if (Intent.ACTION_SCREEN_ON.equals(action)) {
//
(Activity（你的activity）).moveTaskToBack(true);
}
}
};