Android：Bluetooth App用の単一APKで複数のAPIレベルをサポート

Question

Jelly Bean（Android 4.3）でBluetooth機能を使用するアプリケーションを開発しました。私はLollipopのbluetoothクラスにさまざまな方法のセットがあることに気付きました。私がLollipopで自分のアプリケーションを実行すると、失敗しました。私はのように、実行時に異なるAPIレベルをサポートするためのコードを追加できることを学びました

：

private void startScanBluetooth(){ 
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) { 
     // Method supported in Lollipop 
     mLeScanner.stopScan(mScanCallback); 
    } 
    else { 
     // Method for older API level 
     mBluetoothAdapter.stopLeScan(mLeScanCallback); 
    } 
} 

私のコードは私のActivityクラスではなく、任意の方法の外にあるBluetoothAdapter.LeScanCallbackています。

protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE, R.layout.title_bar); 
    setContentView(R.layout.device_list); 

    final BluetoothManager bluetoothManager = 
      (BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE); 
    mBluetoothAdapter = bluetoothManager.getAdapter(); 
    //.... 
} 

private BluetoothAdapter.LeScanCallback mLeScanCallback = 
     new BluetoothAdapter.LeScanCallback() { 

      @Override 
      public void onLeScan(final BluetoothDevice device, final int rssi, byte[] scanRecord) { 
       runOnUiThread(new Runnable() { 
        @Override 
        public void run() { 

         runOnUiThread(new Runnable() { 
          @Override 
          public void run() { 
           //String targetDevice = MainActivity.targetDevice.getText().toString(); 
           //if(targetDevice==null || targetDevice.length()==0 || targetDevice.equals(device.getName())) 
           addDevice(device,rssi); 
          } 
         }); 

        } 
       }); 
      } 
     }; 

このコールバックが廃止されましたように、私は新しいコールバックメソッド必要があります：ロリポップをサポートするScanCallBackをので、私はこのような別のコールバックを追加しました：

mScanCallback = new ScanCallback() { 
     @Override 
     public void onScanResult(int callbackType, ScanResult result) { 
      if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) { 
       Log.i("callbackType", String.valueOf(callbackType)); 
       if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) { 
        Log.i("result", result.toString()); 
        BluetoothDevice btDevice = result.getDevice(); 
        connectToDevice(btDevice); 
       } 
      } 
     } 
    }; 

それは今しかし、ロリポップで実行することができます4.4.2でそれを実行すると、クラスDeviceListActivityを実行するとアプリケーションが予期せず存在します（上記はすべてこのクラスの中にあります）。失敗したときのログ：

@Jesseための

09-02 17:42:46.469 15329-15329/com.conerstoneee2.blecaller D/OLED: Start DeviceListActivity now 
09-02 17:42:46.499 15329-15329/com.conerstoneee2.blecaller D/OLED: onPause 
09-02 17:42:46.519 15329-15329/com.conerstoneee2.blecaller W/dalvikvm: Unable to resolve superclass of Lcom/conerstoneee2/blecaller/DeviceListActivity$3; (63) 
09-02 17:42:46.519 15329-15329/com.conerstoneee2.blecaller W/dalvikvm: Link of class 'Lcom/conerstoneee2/blecaller/DeviceListActivity$3;' failed 
09-02 17:42:46.519 15329-15329/com.conerstoneee2.blecaller E/dalvikvm: Could not find class 'com.conerstoneee2.blecaller.DeviceListActivity$3', referenced from method com.conerstoneee2.blecaller.DeviceListActivity.<init> 
09-02 17:42:46.519 15329-15329/com.conerstoneee2.blecaller W/dalvikvm: VFY: unable to resolve new-instance 1960 (Lcom/conerstoneee2/blecaller/DeviceListActivity$3;) in Lcom/conerstoneee2/blecaller/DeviceListActivity; 
09-02 17:42:46.519 15329-15329/com.conerstoneee2.blecaller D/dalvikvm: VFY: replacing opcode 0x22 at 0x0006 
09-02 17:42:46.519 15329-15329/com.conerstoneee2.blecaller W/dalvikvm: VFY: unable to find class referenced in signature (Landroid/bluetooth/le/ScanCallback;) 
09-02 17:42:46.519 15329-15329/com.conerstoneee2.blecaller I/dalvikvm: Could not find method android.bluetooth.le.BluetoothLeScanner.startScan, referenced from method com.conerstoneee2.blecaller.DeviceListActivity.scanLeDevice 
09-02 17:42:46.519 15329-15329/com.conerstoneee2.blecaller W/dalvikvm: VFY: unable to resolve virtual method 311: Landroid/bluetooth/le/BluetoothLeScanner;.startScan (Landroid/bluetooth/le/ScanCallback;)V 
09-02 17:42:46.519 15329-15329/com.conerstoneee2.blecaller D/dalvikvm: VFY: replacing opcode 0x6e at 0x0024 
09-02 17:42:46.519 15329-15329/com.conerstoneee2.blecaller I/dalvikvm: Could not find method android.bluetooth.le.BluetoothLeScanner.stopScan, referenced from method com.conerstoneee2.blecaller.DeviceListActivity.scanLeDevice 
09-02 17:42:46.519 15329-15329/com.conerstoneee2.blecaller W/dalvikvm: VFY: unable to resolve virtual method 312: Landroid/bluetooth/le/BluetoothLeScanner;.stopScan (Landroid/bluetooth/le/ScanCallback;)V 
09-02 17:42:46.519 15329-15329/com.conerstoneee2.blecaller D/dalvikvm: VFY: replacing opcode 0x6e at 0x0041 
09-02 17:42:46.519 15329-15329/com.conerstoneee2.blecaller I/dalvikvm: Could not find method android.bluetooth.BluetoothAdapter.getBluetoothLeScanner, referenced from method com.conerstoneee2.blecaller.DeviceListActivity.onCreate 
09-02 17:42:46.519 15329-15329/com.conerstoneee2.blecaller W/dalvikvm: VFY: unable to resolve virtual method 283: Landroid/bluetooth/BluetoothAdapter;.getBluetoothLeScanner()Landroid/bluetooth/le/BluetoothLeScanner; 
09-02 17:42:46.519 15329-15329/com.conerstoneee2.blecaller D/dalvikvm: VFY: replacing opcode 0x6e at 0x0071 
09-02 17:42:46.519 15329-15329/com.conerstoneee2.blecaller I/dalvikvm: Could not find method android.bluetooth.le.BluetoothLeScanner.stopScan, referenced from method com.conerstoneee2.blecaller.DeviceListActivity.onDestroy 
09-02 17:42:46.519 15329-15329/com.conerstoneee2.blecaller W/dalvikvm: VFY: unable to resolve virtual method 312: Landroid/bluetooth/le/BluetoothLeScanner;.stopScan (Landroid/bluetooth/le/ScanCallback;)V 
09-02 17:42:46.519 15329-15329/com.conerstoneee2.blecaller D/dalvikvm: VFY: replacing opcode 0x6e at 0x0014 
09-02 17:42:46.519 15329-15329/com.conerstoneee2.blecaller I/dalvikvm: Could not find method android.bluetooth.le.BluetoothLeScanner.stopScan, referenced from method com.conerstoneee2.blecaller.DeviceListActivity.onStop 
09-02 17:42:46.519 15329-15329/com.conerstoneee2.blecaller W/dalvikvm: VFY: unable to resolve virtual method 312: Landroid/bluetooth/le/BluetoothLeScanner;.stopScan (Landroid/bluetooth/le/ScanCallback;)V 
09-02 17:42:46.519 15329-15329/com.conerstoneee2.blecaller D/dalvikvm: VFY: replacing opcode 0x6e at 0x0014 
09-02 17:42:46.519 15329-15329/com.conerstoneee2.blecaller W/dalvikvm: Unable to resolve superclass of Lcom/conerstoneee2/blecaller/DeviceListActivity$3; (63) 
09-02 17:42:46.519 15329-15329/com.conerstoneee2.blecaller W/dalvikvm: Link of class 'Lcom/conerstoneee2/blecaller/DeviceListActivity$3;' failed 
09-02 17:42:46.519 15329-15329/com.conerstoneee2.blecaller D/dalvikvm: DexOpt: unable to opt direct call 0x3ea0 at 0x08 in Lcom/conerstoneee2/blecaller/DeviceListActivity;.<init> 
09-02 17:42:46.519 15329-15329/com.conerstoneee2.blecaller D/AndroidRuntime: Shutting down VM 
09-02 17:42:46.519 15329-15329/com.conerstoneee2.blecaller W/dalvikvm: threadid=1: thread exiting with uncaught exception (group=0x41f8bda0) 
09-02 17:42:46.519 15329-15329/com.conerstoneee2.blecaller E/AndroidRuntime: FATAL EXCEPTION: main 
                      Process: com.conerstoneee2.blecaller, PID: 15329 
                      java.lang.NoClassDefFoundError: com.conerstoneee2.blecaller.DeviceListActivity$3 
                       at com.conerstoneee2.blecaller.DeviceListActivity.<init>(DeviceListActivity.java:181) 
                       at java.lang.Class.newInstanceImpl(Native Method) 
                       at java.lang.Class.newInstance(Class.java:1208) 
                       at android.app.Instrumentation.newActivity(Instrumentation.java:1067) 
                       at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2289) 
                       at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2453) 
                       at android.app.ActivityThread.access$900(ActivityThread.java:173) 
                       at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303) 
                       at android.os.Handler.dispatchMessage(Handler.java:102) 
                       at android.os.Looper.loop(Looper.java:136) 
                       at android.app.ActivityThread.main(ActivityThread.java:5579) 
                       at java.lang.reflect.Method.invokeNative(Native Method) 
                       at java.lang.reflect.Method.invoke(Method.java:515) 
                       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1268) 
                       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1084) 
                       at dalvik.system.NativeStart.main(Native Method) 
09-02 17:42:49.959 15329-15329/com.conerstoneee2.blecaller I/Process: Sending signal. PID: 15329 SIG: 9 

UPDATE おかげで、私は、コールバック内のビルドバージョンをチェックするためのコードを追加できることを指摘します。 APKを正常に作成できますが、現在4.4.2で実行できません。

Answer 1

あなたは閉じるようです。 BluetoothAdapter.LeScanCallbackはインターフェイスです。これを行うとき：

private BluetoothAdapter.LeScanCallback mLeScanCallback = 
     new BluetoothAdapter.LeScanCallback() { 

      @Override 
      public void onLeScan(final BluetoothDevice device, final int rssi, byte[] scanRecord) { 
       runOnUiThread(new Runnable() { 
        @Override 
        public void run() { 

         runOnUiThread(new Runnable() { 
          @Override 
          public void run() { 
           //String targetDevice = MainActivity.targetDevice.getText().toString(); 
           //if(targetDevice==null || targetDevice.length()==0 || targetDevice.equals(device.getName())) 
           addDevice(device,rssi); 
          } 
         }); 

        } 
       }); 
      } 
     }; 

"[あなたの]アクティビティクラスにありますが、どのメソッドの外にもあります。"このコードでは何も起こっていません。これを呼び出すと：

mLeScanner.stopScan(mScanCallback); 

を渡してパラメータとして渡します。 mLeScannerは、必要に応じてそのコールバックを使用します。

したがって、追加のコールバックメソッドを作成してください（ビルドバージョンを確認しないでください）。

private **typeNameGoesHere** mScanCallback = new ScanCallback() { 
     @Override 
     public void onScanResult(int callbackType, ScanResult result) { 
      Log.i("callbackType", String.valueOf(callbackType)); 
      if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) { 
       Log.i("result", result.toString()); 
       BluetoothDevice btDevice = result.getDevice(); 
       connectToDevice(btDevice); 
      } 
     } 
    }; 

次に、startScanBluetoothメソッドをそのまま使用してください。正常に動作するはずです。

private void startScanBluetooth(){ 
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) { 
     // Method supported in Lollipop 
     mLeScanner.stopScan(mScanCallback); 
    } 
    else { 
     // Method for older API level 
     mBluetoothAdapter.stopLeScan(mLeScanCallback); 
    } 
}