Android简单闹钟设置

利用AlarmManager实现闹钟设置

//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);

    }

2.取消闹钟

//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);
    }

3.在service中处理闹钟

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);

    }

}

 4.在acitivity中进行相关提示操作

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;
        }
    }
}

相关权限

<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/>
<uses-permission android:name="android.permission.WAKE_LOCK"/>