android - 我如何将字符串从主要活动传递到带有警报管理器的广播接收器？

Question

我创建了一个带有警报管理器和广播接收器的应用程序，我想将字符串从主要活动传递到公共类 MyScheduleReceiver 扩展 BroadcastReceiver（我在里面有警报管理器），然后到公共类 MyStartServiceReceiver 扩展 BroadcastReceiver 以将数据传递给静态函数......在主要活动使用共享首选项从编辑框中保存此变量。但我不能在接收器内使用共享首选项。我该怎么做？

 public class MyScheduleReceiver extends BroadcastReceiver {
 public void onReceive(Context context, Intent intent) {

  int theHour = intent.getIntExtra("AlarmHour", 0);  
  int theMinute= intent.getIntExtra("AlarmMin", 0); 

AlarmManager service = (AlarmManager) context
    .getSystemService(Context.ALARM_SERVICE);
Intent i = new Intent(context, MyStartServiceReceiver.class);
PendingIntent pending = PendingIntent.getBroadcast(context, 0, i,
    PendingIntent.FLAG_CANCEL_CURRENT);

i.putExtra("data","1");

Calendar cal = Calendar.getInstance();
cal.setTimeInMillis(System.currentTimeMillis());

cal.set(Calendar.HOUR_OF_DAY, theHour);  // set user selection
cal.set(Calendar.MINUTE, theMinute); 
cal.set(Calendar.SECOND, 0);

service.set(AlarmManager.RTC_WAKEUP,
    cal.getTimeInMillis(), pending);

}


public class MyStartServiceReceiver extends BroadcastReceiver {

public void onReceive(Context context, Intent intent) {

  Intent service = new Intent(context, AlarmService.class);

 context.startService(service);

 String result = intent.getStringExtra("data");

 String msg=result;
 try {

    ArduBtTimer.sendData(msg);
} catch (IOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
}

Answer 1

尝试这个：

 where u want to set value:
 i.putExtra("data",yourstring); 
 and for recieve: 
 String value = intent.getStringExtra("data");

Answer 2

我认为您应该使用 BroadCastReceiver 发送要保存的信息，然后用 SP 将其保存在那里。

这是从接收者向活动发送信息的示例：

1. 创建一个内部类，该类BroadcastReceiver在您想要获取数据的活动中进行扩展：

   private BroadcastReceiver ReceivefromService = new BroadcastReceiver(){
       @Override
       public void onReceive(Context context, Intent intent)
       {
           //get the data using the keys you entered at the service
           String IncomingSms=intent.getStringExtra("incomingSms");//
           String phoneNumber=intent.getStringExtra("incomingPhoneNumber");
   
       }
   };
   

2. 将此添加到onPause()：

   @Override
   protected void onPause() {
       super.onPause();
       try {
           unregisterReceiver(ReceivefromService);
       } catch (IllegalArgumentException e) {
           if (e.getMessage().contains("Receiver not registered")) {
               Log.i("TAG","Tried to unregister the reciver when it's not registered");
           }
           else
           {
               throw e;
           }
       }
   }
   

3. 将此添加到onResume()：

   protected void onResume() {
       super.onResume();
       filter.addAction("android.intent.action.SmsReceiver");
       registerReceiver(ReceivefromService, filter);
       //the first parameter is the name of the inner class we created.
   }
   

4. 在接收器/服务中创建一个意图，像这样开始广播：

   Intent i = new Intent("android.intent.action.SmsReceiver").putExtra("incomingSms", message);
   i.putExtra("incomingPhoneNumber", phoneNumber);
   context.sendBroadcast(i);
   

希望它会帮助你...