Android廣播接收器藍牙事件捕獲

我的清單：

<uses-permission android:name="android.permission.BLUETOOTH" /> 
<application> 
    <activity 
     android:name=".MainActivity" 
     android:label="@string/app_name" > 
     <intent-filter> 
      <action android:name="android.intent.action.MAIN" /> 
      <category android:name="android.intent.category.LAUNCHER" /> 
     </intent-filter> 
    </activity> 

    <receiver android:name=".BluetoothBroadcastReceiver" 
       android:label="@string/app_name"> 
     <intent-filter> 
      <action android:name="android.bluetooth.adapter.action.STATE_CHANGED" /> 
      <action android:name="android.bluetooth.adapter.action.CONNECTION_STATE_CHANGED" /> 
      <action android:name="android.bluetooth.device.action.ACL_CONNECTED" /> 
      <action android:name="android.bluetooth.device.action.ACL_DISCONNECTED" /> 
     </intent-filter> 
    </receiver> 
</application>

接收onReceive方法：

public void onReceive(Context context, Intent intent) { 

    String action = intent.getAction(); 
    Log.d("BroadcastActions", "Action "+action+"received"); 
    int state; 
    BluetoothDevice bluetoothDevice; 

    switch(action) 
    { 
     case BluetoothAdapter.ACTION_STATE_CHANGED: 
      state = intent.getIntExtra(BluetoothAdapter.EXTRA_STATE, -1); 
      if (state == BluetoothAdapter.STATE_OFF) 
      { 
       Toast.makeText(context, "Bluetooth is off", Toast.LENGTH_SHORT).show(); 
       Log.d("BroadcastActions", "Bluetooth is off"); 
      } 
      else if (state == BluetoothAdapter.STATE_TURNING_OFF) 
      { 
       Toast.makeText(context, "Bluetooth is turning off", Toast.LENGTH_SHORT).show(); 
       Log.d("BroadcastActions", "Bluetooth is turning off"); 
      } 
      else if(state == BluetoothAdapter.STATE_ON) 
      { 
       Log.d("BroadcastActions", "Bluetooth is on"); 
      } 
      break; 

     case BluetoothDevice.ACTION_ACL_CONNECTED: 
      bluetoothDevice = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE); 
      Toast.makeText(context, "Connected to "+bluetoothDevice.getName(), 
        Toast.LENGTH_SHORT).show(); 
      Log.d("BroadcastActions", "Connected to "+bluetoothDevice.getName()); 
      break; 

     case BluetoothDevice.ACTION_ACL_DISCONNECTED: 
      bluetoothDevice = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE); 
      Toast.makeText(context, "Disconnected from "+bluetoothDevice.getName(), 
        Toast.LENGTH_SHORT).show(); 
      break; 
    } 
}

我啓動應用程序，然後按Home鍵最小化。轉到設置並打開藍牙，但沒有任何反應。雖然我期望吐司和logcat消息。這裏有什麼問題？

來源

2015-05-13 Long Smith

不確定，這可能是因爲廣播註冊的方式。我會嘗試在服務器上註冊，而不是在運行時註冊，看看是否有改變。 –

@VladimirLichonos是的，我試圖添加服務，我註冊接收器。它看起來像這樣'IntentFilter fltr = new IntentFilter（BluetoothDevice.ACTION_ACL_CONNECTED）; fltr.addAction（BluetoothDevice.ACTION_ACL_DISCONNECTED）; fltr.addAction（BluetoothAdapter.ACTION_CONNECTION_STATE_CHANGED）; fltr.addAction（BluetoothAdapter.ACTION_STATE_CHANGED）; registerReceiver（brecv，fltr）;'其中'brecv'是CustomBluetoothReceiver的一個對象。沒有任何變化。 –

你是否在某個地方開始服務？ – osayilgan

爲了趕藍牙狀態變化（STATE_OFF，STATE_TURNING_ON，STATE_ON，STATE_TURNING_OFF），這樣做在你的活動：

首先，添加藍牙允許您AndroidManifest文件：

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

創建BroadcastReceiver在您的活動或服務中：

private final BroadcastReceiver mBroadcastReceiver1 = new BroadcastReceiver() { 

    @Override 
    public void onReceive(Context context, Intent intent) { 
     final String action = intent.getAction(); 

     if (action.equals(BluetoothAdapter.ACTION_STATE_CHANGED)) { 
      final int state = intent.getIntExtra(BluetoothAdapter.EXTRA_STATE, BluetoothAdapter.ERROR); 
      switch(state) { 
       case BluetoothAdapter.STATE_OFF: 
        .. 
        break; 
       case BluetoothAdapter.STATE_TURNING_OFF: 
        .. 
        break; 
       case BluetoothAdapter.STATE_ON: 
        .. 
        break; 
       case BluetoothAdapter.STATE_TURNING_ON: 
        .. 
        break; 
      } 

     } 
    } 
};

創建一個IntentFilter d用的BroadcastReceiver註冊它到活動/服務在onCreate()方法：

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 

    IntentFilter filter1 = new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED); 
    registerReceiver(mBroadcastReceiver1, filter1); 

    ... 
}

註銷的BroadcastReceiver在onDestroy()方法：

@Override 
protected void onDestroy() { 
    super.onDestroy(); 

    unregisterReceiver(mBroadcastReceiver1); 
}

爲了捕捉設備（SCAN_MODE_NONE，SCAN_MODE_CONNECTABLE，SCAN_MODE_CONNECTABLE_DISCOVERABLE的可發現的變化），創建另一個BroadcastReceiver並向您的Activity註冊/取消註冊，如上所述。那些BroadcastReceiver的唯一區別是第一個使用BluetoothAdapter.EXTRA_STATE而另一個使用BluetoothAdapter.EXTRA_SCAN_MODE。下面是示例代碼的BroadcastReceiver捕捉可發現性的變化：

創建過濾器和在onCreate()方法註冊它：

IntentFilter filter2 = new IntentFilter(); 
filter2.addAction(BluetoothAdapter.ACTION_DISCOVERY_STARTED); 
filter2.addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED); 
filter2.addAction(BluetoothAdapter.ACTION_SCAN_MODE_CHANGED); 
registerReceiver(mBroadcastReceiver2, filter2);

在活動/服務創建BroadcastReciver捉可發現性的變化：

private final BroadcastReceiver mBroadcastReceiver2 = new BroadcastReceiver() { 

    @Override 
    public void onReceive(Context context, Intent intent) { 
     final String action = intent.getAction(); 

     if(action.equals(BluetoothAdapter.ACTION_SCAN_MODE_CHANGED)) { 

      int mode = intent.getIntExtra(BluetoothAdapter.EXTRA_SCAN_MODE, BluetoothAdapter.ERROR); 

      switch(mode){ 
       case BluetoothAdapter.SCAN_MODE_CONNECTABLE_DISCOVERABLE: 
        .. 
        break; 
       case BluetoothAdapter.SCAN_MODE_CONNECTABLE: 
        .. 
        break; 
       case BluetoothAdapter.SCAN_MODE_NONE: 
        .. 
        break; 
      } 
     } 
    } 
};

最後在onDestroy()取消註冊：

unregisterReceiver(mBroadcastReceiver2);

請注意，您不需要將任何<intent-filter>或<receiver>添加到您的AndroidManifest文件，除非您需要添加藍牙許可。

如果你想趕上（ACTION_ACL_CONNECTED，ACTION_ACL_DISCONNECTED，ACTION_ACL_DISCONNECT_REQUESTED），現在你需要一個<intent-filter>添加到您的AndroidManifest文件：

<intent-filter> 
    <action android:name="android.bluetooth.device.action.ACL_CONNECTED" /> 
    <action android:name="android.bluetooth.device.action.ACL_DISCONNECTED" /> 
</intent-filter>

創建過濾器和onCreate()方法進行註冊：

IntentFilter filter3 = new IntentFilter(); 
filter3.addAction(BluetoothDevice.ACTION_ACL_CONNECTED); 
filter3.addAction(BluetoothDevice.ACTION_ACL_DISCONNECTED); 
registerReceiver(mBroadcastReceiver3, filter3);

然後在您的活動/服務中創建BroadcastReceiver：

private final BroadcastReceiver mBroadcastReceiver3 = new BroadcastReceiver() { 

    @Override 
    public void onReceive(Context context, Intent intent) { 
     String action = intent.getAction(); 

     switch (action){ 
      case BluetoothDevice.ACTION_ACL_CONNECTED: 
       .. 
       break; 
      case BluetoothDevice.ACTION_ACL_DISCONNECTED: 
       .. 
       break; 
     } 
    } 
};

最後，註銷：

unregisterReceiver(mBroadcastReceiver3);

如果您想了解更多關於狀態常量，這是從文檔：

public static final String EXTRA_STATE：

用作在一個整型附加域ACTION_STATE_CHANGED意圖請求當前的電源狀態。可能的值有：STATE_OFF， STATE_TURNING_ON，STATE_ON，STATE_TURNING_OFF

public static final String EXTRA_SCAN_MODE：

用作在ACTION_SCAN_MODE_CHANGED意圖一個整型附加域，以請求當前的掃描模式。可能的值有：SCAN_MODE_NONE， SCAN_MODE_CONNECTABLE，SCAN_MODE_CONNECTABLE_DISCOVERABLE

來源

2015-05-17 22:07:35

我想在我的應用程序中使用Connect Disconnect廣播我有相同的代碼，但我在Manifest本身中註冊了廣播。問題是我隨機接收廣播隨機設備..我使用Android M（6.0）我剛剛配對設備也收到廣播，有時也沒有配對，也有設備也不在配對模式，那麼也可以請幫幫我？ – AdiAtAnd

奧利奧做了些什麼改變？這似乎不再起作用 – behelit

https://developer.android.com/guide/components/broadcasts.html#receiving_broadcasts：「從Android 8.0（API級別26）開始，系統對清單聲明的接收器施加了額外的限制。如果您的應用程序的目標是API級別26或更高，則無法使用清單爲大多數隱式廣播聲明接收方（廣播不專門針對您的應用程序）。「 – xvlcw

你的主要問題;）您不能使用「開關」字符串比較。

至少直到VERSION_INT 18（含）。版本19以Java 7開始。

來源

2017-11-15 20:56:27 chksr

Android廣播接收器藍牙事件捕獲

回答

相關問題