Kann den UART-Service auf Android

Question

nicht initialisieren Ich entwickle mobile App, die mit Sensor arbeiten, die UART verwenden. Beispiel von official github page funktioniert perfekt, aber Code extrahiert nicht funktioniert. Das einzige, was ich geändert habe, ist eine Gerätesuche, aber dieser Code funktioniert perfekt mit dem Polar H7-Gerät (es werden nur der Gerätename und die Geräteadresse erkannt und an die nächste Aktivität gesendet). Auf dieser Aktivität versuche ich zu UART-Gerät zu anschließen, hier ist der Code:

public class UartRecordingActivity AppCompatActivity erstreckt {

private final static String TAG = UartRecordingActivity.class.getSimpleName(); 

// BLE stuff 
public static final String EXTRAS_DEVICE_NAME = "DEVICE_NAME"; 
public static final String EXTRAS_DEVICE_ADDRESS = "DEVICE_ADDRESS"; 


//private BleService bleService; 

private String deviceName; 
private String deviceAddress; 

//private BleServicesAdapter gattServiceAdapter; 

private boolean isConnected = false; 



private static final int REQUEST_SELECT_DEVICE = 1; 
private static final int REQUEST_ENABLE_BT = 2; 
private static final int UART_PROFILE_READY = 10; 
private static final int UART_PROFILE_CONNECTED = 20; 
private static final int UART_PROFILE_DISCONNECTED = 21; 
private static final int STATE_OFF = 10; 
private int mState = UART_PROFILE_DISCONNECTED; 

private UartService mService = null; 
private BluetoothDevice mDevice = null; 
private BluetoothAdapter mBtAdapter = null; 


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

    Log.i(TAG, "onCreate"); 

    final Intent intent = getIntent(); 
    deviceName = intent.getStringExtra(EXTRAS_DEVICE_NAME); 
    deviceAddress = intent.getStringExtra(EXTRAS_DEVICE_ADDRESS); 

    final Intent gattServiceIntent = new Intent(this, UartService.class); 
    bindService(gattServiceIntent, mServiceConnection, BIND_AUTO_CREATE); 

} 

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

    mBtAdapter = BluetoothAdapter.getDefaultAdapter(); 
    service_init(); 

    mDevice = BluetoothAdapter.getDefaultAdapter().getRemoteDevice(deviceAddress); 
    mService.connect(deviceAddress); 
} 

private void service_init() { 
    Intent bindIntent = new Intent(this, UartService.class); 
    bindService(bindIntent, mServiceConnection, BIND_AUTO_CREATE); 

    LocalBroadcastManager.getInstance(this).registerReceiver(UARTStatusChangeReceiver, 
      makeGattUpdateIntentFilter()); 
} 

//UART service connected/disconnected 
private ServiceConnection mServiceConnection = new ServiceConnection() { 
    public void onServiceConnected(ComponentName className, IBinder rawBinder) { 
     mService = ((UartService.LocalBinder) rawBinder).getService(); 
     Log.d(TAG, "onServiceConnected mService= " + mService); 
     if (!mService.initialize()) { 
      Log.e(TAG, "Unable to initialize Bluetooth"); 
      finish(); 
     } 

    } 


    public void onServiceDisconnected(ComponentName classname) { 
     mService = null; 
    } 
}; 


@Override 
public boolean onOptionsItemSelected(MenuItem menuItem) { 
    if (menuItem.getItemId() == android.R.id.home) { 
     Intent intent = new Intent(this, HomeActivity.class); 
     startActivity(intent); 
    } 
    return super.onOptionsItemSelected(menuItem);} 

Privat letzte BroadcastReceiver UARTStatusChangeReceiver = new BroadcastReceiver() { @Override public void OnReceive (Kontextkontext, Absichtsabsicht) { String action = intent.getAction();

final Intent mIntent = intent; 
    //*********************// 
    if (action.equals(UartService.ACTION_GATT_CONNECTED)) { 
     runOnUiThread(new Runnable() { 
      public void run() { 
       String currentDateTimeString = DateFormat.getTimeInstance().format(new Date()); 
       Log.d(TAG, "UART_CONNECT_MSG"); 

       mState = UART_PROFILE_CONNECTED; 
      } 
     }); 
    } 

    //*********************// 
    if (action.equals(UartService.ACTION_GATT_DISCONNECTED)) { 

     runOnUiThread(new Runnable() { 
      public void run() { 
       String currentDateTimeString = DateFormat.getTimeInstance().format(new Date()); 
       Log.d(TAG, "UART_DISCONNECT_MSG"); 
       mState = UART_PROFILE_DISCONNECTED; 
       mService.close(); 
      } 
     }); 
    } 

    //*********************// 
    if (action.equals(UartService.ACTION_GATT_SERVICES_DISCOVERED)) { 
     mService.enableTXNotification(); 
    } 
    //*********************// 
    if (action.equals(UartService.ACTION_DATA_AVAILABLE)) { 
     Log.i("data","received"); 
     final byte[] txValue = intent.getByteArrayExtra(UartService.EXTRA_DATA); 
     //handle data 
    } 
    //*********************// 
    if (action.equals(UartService.DEVICE_DOES_NOT_SUPPORT_UART)) { 
    } 

} 

};

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

Fehler durch diese Linie (MSERVICE verursacht Nullpointer verursacht wird.

mService.connect(deviceAddress); 

Answer 1

Methode OnServiceConnected ist garantiert, dass Sie durch die Bindung In OnStart Rückruf-Service verbunden wurden, haben Sie Nullpointer, denn wenn man bindService nennen , es braucht ein wenig Zeit, um eine Verbindung herzustellen. Machen Sie einfach Ihren Code so:

public void onServiceConnected(ComponentName className, IBinder rawBinder) { 
    mService = ((UartService.LocalBinder) rawBinder).getService(); 
    Log.d(TAG, "onServiceConnected mService= " + mService); 
    if (!mService.initialize()) { 
     Log.e(TAG, "Unable to initialize Bluetooth"); 
     finish(); 
    } 
    mDevice = BluetoothAdapter.getDefaultAdapter().getRemoteDevice(deviceAddress); 
    mService.connect(deviceAddress); 
}