sendBroadcast不能使用自定義意圖過濾器

Question

我想修改BluetoothLeGatt項目作爲Android Studio的示例，以便每次讀取特性時將RSSI值發送回主要活動以進行顯示。我創建了一個新的意圖過濾器，但接收方從未收到意圖。我已經嘗試將它添加到清單文件，但也沒有工作。

這裏的服務代碼：

public class BluetoothLeService extends Service { 
... 
public final static String ACTION_GATT_CONNECTED = 
     "com.example.bluetooth.le.ACTION_GATT_CONNECTED"; 
public final static String ACTION_GATT_DISCONNECTED = 
     "com.example.bluetooth.le.ACTION_GATT_DISCONNECTED"; 
public final static String ACTION_GATT_SERVICES_DISCOVERED = 
     "com.example.bluetooth.le.ACTION_GATT_SERVICES_DISCOVERED"; 
public final static String ACTION_DATA_AVAILABLE = 
     "com.example.bluetooth.le.ACTION_DATA_AVAILABLE"; 
public final static String RSSI_DATA_AVAILABLE = 
     "com.example.bluetooth.le.RSSI_DATA_AVAILABLE"; 
public final static String EXTRA_DATA = 
     "com.example.bluetooth.le.EXTRA_DATA"; 
public final static String EXTRA_RSSI = 
     "com.example.bluetooth.le.EXTRA_RSSI"; 

@Override 
public void onCharacteristicRead(BluetoothGatt gatt, 
            BluetoothGattCharacteristic characteristic, 
            int status) { 
    if (status == BluetoothGatt.GATT_SUCCESS) { 
     broadcastUpdate(ACTION_DATA_AVAILABLE, characteristic); 
     mBluetoothGatt.readRemoteRssi(); 
    } 
} 

@Override 
public void onReadRemoteRssi(BluetoothGatt gatt, int rssi, int status) { 
    final Intent intent = new Intent(); 
    if (status == BluetoothGatt.GATT_SUCCESS) { 
     intent.putExtra(EXTRA_RSSI, String.valueOf(rssi)); 
     intent.setAction(RSSI_DATA_AVAILABLE); 
     sendBroadcast(intent); 
    } 
} 

，並且活動：

public class DeviceControlActivity extends Activity { 
    ... 
    private final BroadcastReceiver mGattUpdateReceiver = new BroadcastReceiver() { 
     @Override 
     public void onReceive(Context context, Intent intent) { 
      final String action = intent.getAction(); 
      if (BluetoothLeService.ACTION_GATT_CONNECTED.equals(action)) { 
       mConnected = true; 
       updateConnectionState(R.string.connected); 
       invalidateOptionsMenu(); 
      } else if (BluetoothLeService.ACTION_GATT_DISCONNECTED.equals(action)) { 
       mConnected = false; 
       updateConnectionState(R.string.disconnected); 
       invalidateOptionsMenu(); 
       clearUI(); 
      } else if (BluetoothLeService.ACTION_GATT_SERVICES_DISCOVERED.equals(action)) { 
       // Show all the supported services and characteristics on the user interface. 
       displayGattServices(mBluetoothLeService.getSupportedGattServices()); 
      } else if (BluetoothLeService.ACTION_DATA_AVAILABLE.equals(action)) { 
       displayData(intent.getStringExtra(BluetoothLeService.EXTRA_DATA)); 
      } else if (BluetoothLeService.RSSI_DATA_AVAILABLE.equals(action)) { 
       updateRssi(intent.getStringExtra(BluetoothLeService.EXTRA_RSSI)); 
      } 
     } 
     }; 
... 

}

答：

我不得不行動加入到這個方法在活動：

private static IntentFilter makeGattUpdateIntentFilter() { 
    final IntentFilter intentFilter = new IntentFilter(); 
    intentFilter.addAction(BluetoothLeService.ACTION_GATT_CONNECTED); 
    intentFilter.addAction(BluetoothLeService.ACTION_GATT_DISCONNECTED); 
    intentFilter.addAction(BluetoothLeService.ACTION_GATT_SERVICES_DISCOVERED); 
    intentFilter.addAction(BluetoothLeService.ACTION_DATA_AVAILABLE); 
    intentFilter.addAction(BluetoothLeService.RSSI_DATA_AVAILABLE); 
    return intentFilter; 
} 

Answer 1

覆蓋onResume在您的Activity，創建一個IntentFilter，添加您的自定義操作，並註冊廣播接收器。

IntentFilter filter = new IntentFilter(); 
// call addAction for every action you want to receive in your BroadcastReceiver 
filter.addAction(BluetoothLeService.ACTION_GATT_CONNECTED); 

，然後用

registerReceiver(mGattUpdateReceiver, filter); 

覆蓋的onPause註冊，然後致電unregeisterReceiver

unregisterReceiver(mGattUpdateReceiver);