This file is used to solve the miui wake up delay problem.

AlarmReceiver

package com.dove.alarm;

import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.os.Build;
import android.util.Log;

public class AlarmReceiver extends BroadcastReceiver {
    public final static String TAG = AlarmReceiver.class.getSimpleName();

    public final static String MANUFACTURER_XIAOMI = "xiaomi";

    private final static long WAKEUP_DELAYED_TIME_MILLIS = 5 * 60 * 1000L;
    private final static String ORIGIONAL_OPERATION = "origional_operation";
    private final static String ORIGIONAL_SET_TIME = "origional_set_time";

    public final static String ACTION_ALARM_RETRY = "com.dove.alarm.retry";
    public final static String ACTION_ALARM_SEND = "com.dove.alarm.send";
    public final static String ACTION_ALARM_CANCEL = "com.dove.alarm.cancel";

    public static void set(Context context, int type, long triggerAtMillis, PendingIntent operation) {
        PendingIntent sender = operation;
        if (MANUFACTURER_XIAOMI.equalsIgnoreCase(Build.MANUFACTURER)) {
            if (type == AlarmManager.RTC_WAKEUP || type == AlarmManager.ELAPSED_REALTIME_WAKEUP) {
                Intent intent = new Intent(context, AlarmReceiver.class);
                intent.setAction(ACTION_ALARM_RETRY);
                intent.putExtra(ORIGIONAL_OPERATION, operation);
                intent.putExtra(ORIGIONAL_SET_TIME, triggerAtMillis);

                triggerAtMillis -= WAKEUP_DELAYED_TIME_MILLIS;
                sender = PendingIntent
                        .getBroadcast(context, 0, intent, PendingIntent.FLAG_ONE_SHOT);
            }
        }

        AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
        alarmManager.set(type, triggerAtMillis, sender);
    }

    @Override
    public void onReceive(Context context, Intent intent) {
        final String action = intent.getAction();
        if (ACTION_ALARM_RETRY.equals(action)) {
            long triggerAtMillis = intent.getLongExtra(ORIGIONAL_SET_TIME,
                    System.currentTimeMillis());
            AlarmManager alarmManager = (AlarmManager) context
                    .getSystemService(Context.ALARM_SERVICE);
            PendingIntent operation = intent.getParcelableExtra(ORIGIONAL_OPERATION);
            alarmManager.set(AlarmManager.RTC, triggerAtMillis, operation);
        } else if (ACTION_ALARM_SEND.equals(action)) {
            Log.d(TAG, "Receive a send action");
        } else if (ACTION_ALARM_CANCEL.equals(action)) {
            Log.d(TAG, " Receive a cancel action");
        }
    }
}