将来自BroadcastReceiver类的字符串数据传递给Android活动

Question

我正在开发一个Android应用程序，它具有在应用程序在用户启用或禁用GPS的情况下运行时的功能。我收到广播并使用界面在活动上显示状态。

GpsLocationReceiver

public class GpsLocationReceiver extends BroadcastReceiver { 


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

    final LocationManager manager = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE); 
    if (!manager.isProviderEnabled(LocationManager.GPS_PROVIDER)) { 


     Toast.makeText(context, "GPS Disabled", Toast.LENGTH_SHORT).show(); 
    } 


} 

我注册这个广播接收器中的Manifest.xml

<receiver android:name=".GpsLocationReceiver"> 
     <intent-filter> 
      <action android:name="android.location.PROVIDERS_CHANGED" /> 
      <category android:name="android.intent.category.DEFAULT" /> 
     </intent-filter> 
    </receiver> 

Answer 1

步骤1

private void sendLocationBroadcast(Intent intent) { 
    SharedPreferences pref = getSharedPreferences(Data.SHARED_PREF_NAME, 0); 
    totaldisplacement = Double.parseDouble(pref.getString(Data.SP_TOTAL_DISTANCE_COVER_TILL, "")); 
    intent.putExtra(Data.SP_TOTAL_DISTANCE_COVER_TILL, totaldisplacement); 
    intent.putExtra("latitude", currentlat); 
    intent.putExtra("longitude", currentlong); 
    LocalBroadcastManager.getInstance(this).sendBroadcast(intent); 
    Log.e("Data", "" + rikshawspeed + " " + currentlat); 
} 

步骤2

private void dataSendToMainActivity() { 
    Intent intent = new Intent("speedExceeded"); 
    sendLocationBroadcast(intent); 
} 

步骤3

public BroadcastReceiver mMessageReceiver = new BroadcastReceiver() { 
    @Override 
    public void onReceive(Context context, Intent intent) { 
     String action = intent.getAction(); 
     distanceFromService = intent.getDoubleExtra(Data.SP_TOTAL_DISTANCE_COVER_TILL, 55); 
     Double currentLatitude = intent.getDoubleExtra("latitude", 0); 
     Double currentLongitude = intent.getDoubleExtra("longitude", 0); 
     // Toast.makeText(getApplicationContext(), "speed " + distanceFromService + "\n" + "Lat Long " + "\n" + currentLatitude + "\n" + currentLongitude, Toast.LENGTH_SHORT).show(); 
     // ... react to local broadcast message 
     Log.e("Main", "" + distanceFromService); 
    } 
}; 

步骤4

LocalBroadcastManager.getInstance(this).registerReceiver(mMessageReceiver, new IntentFilter("speedExceeded")); 

Answer 2

1. 在活动

   public void onResume() { 
   registerReceiver(mGattUpdateReceiver, new IntentFilter().addAction("ACTION_DATA_AVAILABLE"); 
       return intentFilter;); 
   } 
   
   public void onPause(){ 
   unregisterReceiver(mGattUpdateReceiver); 
   } 
   
   private final BroadcastReceiver mGattUpdateReceiver = new BroadcastReceiver() { 
       @Override 
       public void onReceive(Context context, Intent intent) { 
        final String action = intent.getAction(); 
        if(action.equals("ACTION_DATA_AVAILABLE")) { 
       } 
       } 
   }; 
   

   2. 在BroadcastReciver onReciever（）

   final Intent intent = new Intent("ACTION_DATA_AVAILABLE"); 
   intent.putExtra("KEY","YourString"); 
   sendBroadcast(intent);