安排未来的通知闹钟android

Question

我是Android开发的新手，并开发了我的第一个应用程序。

我想从数据库的日期显示通知给用户安排在后台。我在Google上关注了很多教程，这就是我所做的。

我已创建setAarm()函数在主要活动和boradcast接收机类。

MainActivity.java

package com.example.myapp; 

import ... 


public class MainActivity extends AppCompatActivity 
     implements NavigationView.OnNavigationItemSelectedListener { 

    TextView navigationHeaderUserName; 
    DatabaseHelper myDB; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
     setSupportActionBar(toolbar); 

     myDB = new DatabaseHelper(this); 

     View header = navigationView.getHeaderView(0); 
     navigationHeaderUserName = (TextView) header.findViewById(R.id.drawer_layout_user_name); 

     // display dashboard when the activity is loaded 
     FragmentTransaction ft = getSupportFragmentManager().beginTransaction(); 
     ft.replace(R.id.content_frame, new ActivityDashboard()); 
     ft.commit(); 

     // set alarm 
     setAlarm(); 
    } 

    public void setAlarm() { 

     // notification service 
     boolean alarm = (PendingIntent.getBroadcast(this, 0, new Intent("ALARM"), PendingIntent.FLAG_NO_CREATE) == null); 
     if (alarm) { 
      Intent intentAlarm = new Intent("ALARM"); 
      PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0, intentAlarm, 0); 
      Calendar calendarAlarm = Calendar.getInstance(); 
      calendarAlarm.setTimeInMillis(System.currentTimeMillis()); 
      calendarAlarm.add(Calendar.SECOND, 3); 
      AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE); 
      alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, calendarAlarm.getTimeInMillis(), 6000, pendingIntent); 
     } 
    } 

    @SuppressWarnings("StatementWithEmptyBody") 
    @Override 
    public boolean onNavigationItemSelected(@NonNull MenuItem item) { 

     // calling the method displaySelectedScreen() 
     displaySelectedScreen(item.getItemId()); 

     return true; 
    } 

    private void displaySelectedScreen(int itemId) { 

     .... // some code 
     .... // some code 
    } 
} 

ActivityAlarmReceiver.java

package com.example.myapp; 

    import ... 

public class ActivityAlarmReceiver extends BroadcastReceiver { 

    @Override 
    public void onReceive(Context context, Intent intent) { 
     try { 

      DatabaseHelper db = new DatabaseHelper(context); 
      String nextDate = db.getNextDate(); 

      if (nextDate == null) { 
       return; 
      } 

      SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy"); 
      SimpleDateFormat stf = new SimpleDateFormat("HH:MM:SS"); 

      String nextTime = "08:00:00"; 

      Date dateFormat = sdf.parse(nextDate); 
      Date timeFormat = stf.parse(nextTime); 

      Date today = new Date(); 

      if (dateFormat.equals(today)) { 
       Intent intent1 = new Intent(context, MainActivity.class); 
       createNotification(context, intent1, "New Message", "body!", "This is alarm"); 
      } 
     } catch (Exception e) { 
      Log.i("date", "error == " + e.getMessage()); 
     } 
    } 

    private void createNotification(Context context, Intent intent1, String ticker, String title, String description) { 

     NotificationManager notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE); 
     PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, intent1, 0); 

     NotificationCompat.Builder builder = new NotificationCompat.Builder(context); 

     builder.setTicker(ticker); 
     builder.setContentTitle(title); 
     builder.setContentText(description); 
     builder.setSmallIcon(R.drawable.my_time_logo_transparent); 
     builder.setContentIntent(pendingIntent); 

     Notification n = builder.build(); 

     // create the notification 
     n.vibrate = new long[]{150, 300, 150, 400}; 
     n.flags = Notification.FLAG_AUTO_CANCEL; 
     notificationManager.notify(R.drawable.my_time_logo_transparent, n); 

     // create a vibration 
     try { 
      Uri som = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION); 
      Ringtone toque = RingtoneManager.getRingtone(context, som); 
      toque.play(); 
     } catch (Exception e) { 

     } 
    } 
} 

但是，这是不工作...我敢肯定，我失去了一些东西，但couldn”吨找到了什么？

Answer 1

This link（Scheduling Repeating Alarms）帮助你。您必须在您的Manifest中添加以下代码：

<uses-permission android:name="android.permission.WAKE_LOCK"></uses-permission> 
<receiver android:process=":remote" android:name=".ActivityAlarmReceiver"></receiver>