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私はUARTを使用するセンサーで動作するモバイルアプリケーションを開発しています。例：official github pageは完璧に動作しますが、コードはdoesnt作業から抽出されます。私が変更したのはデバイス検索だけですが、このコードはPolar H7デバイス（デバイス名とデバイスアドレスの検出と次のアクティビティへの送信のみ）で完璧に機能します。私は、UARTデバイスに接続しようとしています。この活動では、ここではコードです：AndroidでUARTサービスを初期化できません
パブリッククラスUartRecordingActivityがAppCompatActivity {
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);}
民間最終BroadcastReceiver UARTStatusChangeReceiver =新しいBroadcastReceiver（）{ @Override 公共空間を拡張しonReceive （コンテキストコンテキスト、意図インテント）{ 文字列アクション= 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;
}}
エラーがこの行によって引き起こされる（mServiceは、NullPointerExceptionが原因：あなたはbindServiceを呼び出すときので、あなたが結合することによってサービスを提供するために接続されていた
mService.connect(deviceAddress);