//设置本地闹钟,actiongString:闹钟标识

setLocAlarm(int week, String actionString) {

        Calendar currentCalendar = Calendar.getInstance();

        currentCalendar.setTime(new Date());

        int nowWeek = currentCalendar.get(Calendar.DAY_OF_WEEK);

        int nowHour = currentCalendar.get(Calendar.HOUR_OF_DAY);

        int nowMinute = currentCalendar.get(Calendar.MINUTE);

        int setHour = mTimePicker.getCurrentHour();

        int setMinute = mTimePicker.getCurrentMinute();

        Calendar calendar = Calendar.getInstance();

        calendar.set(Calendar.DAY_OF_WEEK, week);//星期

        calendar.set(Calendar.HOUR_OF_DAY, setHour);//时

        calendar.set(Calendar.MINUTE, setMinute);//分

        calendar.set(Calendar.SECOND, 0);//秒

        //代表设置的的是过去的时间加上7*24*60*60秒

        if (week < nowWeek || (week == nowWeek && setHour < nowHour) || (week == nowWeek && setHour == nowHour && setMinute < nowMinute)) {

            calendar.add(Calendar.SECOND, 7 * 24 * 60 * 60);

        }

        Intent intent = new Intent(getActivity(), AlarmService.class);

        intent.setAction(actionString);

        PendingIntent pendingIntent = PendingIntent.getService(getActivity(), 0, intent, PendingIntent.FLAG_CANCEL_CURRENT);

//指定唤醒service

        AlarmManager manager = (AlarmManager) getActivity().getSystemService(Context.ALARM_SERVICE);

//设置准确时间也可以利用manager.setRepeating();设置重复闹钟（时间不准）

        manager.setExact(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), pendingIntent);

    }

//根据表示取消闹钟

void cancelAlarm(String actionString) {

        Intent intent = new Intent(getActivity(), AlarmService.class);

        intent.setAction(actionString);

        PendingIntent pendingIntent = PendingIntent.getService(getActivity(), 0, intent, PendingIntent.FLAG_CANCEL_CURRENT);

        AlarmManager manager = (AlarmManager) getActivity().getSystemService(Context.ALARM_SERVICE);

        manager.cancel(pendingIntent);

    }

public class AlarmService extends Service {

    public AlarmService() {

    }

    @Nullable

    @Override

    public IBinder onBind(Intent intent) {

        return null;

    }

    @Override

    public int onStartCommand(Intent intent, int flags, int startId) {

        LogUtil.d("sss","收到了。。action=="+intent.getAction());

        // 如果是重复的闹钟就根据当前时间重新设置下

        if  (needRepeat) {

            resetAlarm(intent.getAction());

        }

        Intent intent1 = new Intent();

        intent1.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

//打开闹钟提示activity

        intent1.setClass(this, AlarmTipActivity.class);

        //若果是在前台收到的闹钟消息

        if (LHTool.isForeceground(this)) {

            intent1.putExtra("fromhead",true);

        }else {

            intent1.putExtra("fromhead",false);

        }

        startActivity(intent1);

      return   super.onStartCommand(intent,flags,startId);

    }

    //重新设置下周当前时间的闹钟

    private void resetAlarm(String actionStr){

        Calendar calendar = Calendar.getInstance();

        calendar.setTime(new Date());

        calendar.add(Calendar.SECOND, 7 * 24 * 60 * 60);

        Intent intent = new Intent(this, AlarmService.class);

        intent.setAction(actionStr);

        PendingIntent pendingIntent = PendingIntent.getService(this, 0, intent, PendingIntent.FLAG_CANCEL_CURRENT);

        AlarmManager manager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);

//        manager.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), 7 * 24 * 60 * 60 * 1000, pendingIntent);

        manager.setExact(AlarmManager.RTC_WAKEUP,calendar.getTimeInMillis(),pendingIntent);

    }

}

public class AlarmTipActivity extends AppCompatActivity {

    private MediaPlayer mMediaPlayer;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_alarm_tip);

        AlertDialog.Builder builder = new AlertDialog.Builder(this);

        final AlertDialog dialog = builder.create();

        builder.setMessage("Alarm Clock!");

        builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {

            @Override

            public void onClick(DialogInterface dialogInterface, int i) {

                 dialog.cancel();

                Intent intent = getIntent();

                //如果不是从前台过来的闹钟就启动MainActivity

                if (!intent.getBooleanExtra("fromhead", false)) {

                    Intent intent1 = new Intent();

                    intent1.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);

                    intent1.setClass(AlarmTipActivity.this, MainActivity.class);

                    startActivity(intent1);

                }

                finish();

            }

        });

//点击空白处不可取消alert

        builder.setCancelable(false);

        builder.show();

        wakeUpScreen();

    }

    @Override

    protected void onStart() {

        super.onStart();

        //确保唤醒后也能播放音乐

        playMusic();

    }

    private void playMusic() {

        mMediaPlayer = MediaPlayer.create(this, LHSharePreferenceTool.getAlarmRing(this));

        mMediaPlayer.setWakeMode(getApplicationContext(), PowerManager.PARTIAL_WAKE_LOCK);

        mMediaPlayer.setScreenOnWhilePlaying(true);

        mMediaPlayer.start();

    }

    /*唤醒屏幕*/

    private void wakeUpScreen() {

        getWindow().addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED|

                WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON

                | WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON|WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD

                |WindowManager.LayoutParams.FLAG_ALLOW_LOCK_WHILE_SCREEN_ON);

    }

    @Override

    protected void onStop() {

        super.onStop();

        if (mMediaPlayer != null) {

            mMediaPlayer.release();

            mMediaPlayer = null;

        }

    }

}