Почему мое приложение ble sh, когда я перемещаю вызов функции на другую кнопку? - PullRequest
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Почему мое приложение ble sh, когда я перемещаю вызов функции на другую кнопку?

1 голос
/ 09 марта 2020

В настоящее время я пытаюсь сделать приложение, которое разрабатываю, более простым в использовании, но сталкиваюсь с проблемой, пытающейся объединить количество кнопок, необходимых для установления sh соединения с PSO C 4 BLE. В конце я хочу одну кнопку для поиска, подключения и обнаружения сервисов. Но когда я копирую и вставляю код (для поиска, подключения и обнаружения) в соответствии с методом, который обрабатывает активацию радиомодуля Bluetooth, приложение вызывает sh при обнаружении обратного вызова сканирования. Я все еще новичок в разработке приложений Android и пытаюсь использовать отладчик, но я застрял. Первый фрагмент кода - это то, что я пытаюсь сделать, второй фрагмент - это функция сканирования, которая вызывается. Следующий фрагмент кода является выходом отладчика. 

//what I am trying to do
    public void startBluetooth(View view) {

        /** Find BLE service and adapter */
        final BluetoothManager bluetoothManager =
                (BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE);
        BluetoothAdapter mBluetoothAdapter = bluetoothManager.getAdapter();

        /** Ensures Bluetooth is enabled on the device.  If Bluetooth is not currently enabled,
        // fire an intent to display a dialog asking the user to grant permission to enable it. */
        if (!mBluetoothAdapter.isEnabled()) {
            Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
            startActivityForResult(enableBtIntent, REQUEST_ENABLE_BLE);
        }

        /** Start the BLE Service */
        Log.d(TAG, "Starting BLE Service");
        Intent gattServiceIntent = new Intent(this, PSoCCapSenseLEDService.class);
        bindService(gattServiceIntent, mServiceConnection, BIND_AUTO_CREATE);


        /** Disable the start button and turn on the search  button */
        start_button.setEnabled(false);
        search_button.setEnabled(true);
        Log.d(TAG, "Bluetooth is Enabled");



        // search function does not crash app
        // cannot force step into if statement, is mServiceConnected true?
        // no mServiceConnected appears to false
        // okay let's force this if statement to be executed
        // but first setting code back to normal and seeing how mServiceConnected is set

       mPSoCCapSenseLedService.scan(); // causes crash
        mPSoCCapSenseLedService.connect(); // crash
        mPSoCCapSenseLedService.discoverServices();
    }

    public void scan() {
        /** Scan for devices and look for the one with the service that we want
         *   UUID ending in F0 i.e. the ledcapsense service*/
        UUID capsenseLedService = UUID.fromString(capsenseLedServiceUUID);
        UUID[] capsenseLedServiceArray = {capsenseLedService};

        /** Use old scan method for versions for different platform versions */
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
            /** noinspection deprecation */
            mBluetoothAdapter.startLeScan(capsenseLedServiceArray, mLeScanCallback);
        } else { /** New BLE scanning introduced in LOLLIPOP */
            ScanSettings settings;
            List<ScanFilter> filters;
            mLEScanner = mBluetoothAdapter.getBluetoothLeScanner();
            settings = new ScanSettings.Builder()
                    .setScanMode(ScanSettings.SCAN_MODE_LOW_LATENCY)
                    .build();
            filters = new ArrayList<>();
            /** We will scan just for the CAR's UUID */
            ParcelUuid PUuid = new ParcelUuid(capsenseLedService);
            ScanFilter filter = new ScanFilter.Builder().setServiceUuid(PUuid).build();
            filters.add(filter);
            mLEScanner.startScan(filters, settings, mScanCallback);
        }
    }

this.mResolvedMethod = No such instance field: 'mResolvedMethod'
this = {MainActivity@9661} 
view = {AppCompatButton@9664} "android.support.v7.widget.AppCompatButton{60e52c VF.D..C.. ...P..ID 64,64-1376,256 #7f07008a app:id/start_button}"
bluetoothManager = {BluetoothManager@9665} 
 mAdapter = {BluetoothAdapter@9666} 
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mPSoCCapSenseLedService = null

Ответы [ 3 ]

0 голосов
/ 15 марта 2020

После обсуждения этого вопроса с моим профессором мы обнаружили, что обратные вызовы сканирования, подключения и обнаружения выполняются практически одновременно, а не последовательно. Чтобы избежать одновременного выполнения, я отложил обратные вызовы, и после обширных проб и ошибок это были оптимальные задержки, которые я нашел. 

    public void startBluetooth(View view) {

        /** Find BLE service and adapter */
        final BluetoothManager bluetoothManager =
                (BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE);
        BluetoothAdapter mBluetoothAdapter = bluetoothManager.getAdapter();

        /** Ensures Bluetooth is enabled on the device.  If Bluetooth is not currently enabled,
        // fire an intent to display a dialog asking the user to grant permission to enable it. */
        if (!mBluetoothAdapter.isEnabled()) {
            Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
            startActivityForResult(enableBtIntent, REQUEST_ENABLE_BLE);
        }

        /** Start the BLE Service */
        Log.d(TAG, "Starting BLE Service");
        Intent gattServiceIntent = new Intent(this, PSoCCapSenseLEDService.class);
        bindService(gattServiceIntent, mServiceConnection, BIND_AUTO_CREATE);


        /** Disable the start button and turn on the search  button */
        start_button.setEnabled(false);
        search_button.setEnabled(true);
        Log.d(TAG, "Bluetooth is Enabled");

        new CountDownTimer(15, 1000) {
            public void onFinish() {
                // When timer is finished
                // Execute your code here
                mPSoCCapSenseLedService.scan();
            }

            public void onTick(long millisUntilFinished) {
                // millisUntilFinished    The amount of time until finished.
            }
        }.start();

// roughly 65ms after scanning
        new CountDownTimer(80, 1000) {
            public void onFinish() {
                // When timer is finished
                // Execute your code here
                mPSoCCapSenseLedService.connect();
            }

            public void onTick(long millisUntilFinished) {
                // millisUntilFinished    The amount of time until finished.
            }
        }.start();

// needs to be roughly 260ms after connection
        new CountDownTimer(340, 1000) {
            public void onFinish() {
                // When timer is finished
                // Execute your code here
                mPSoCCapSenseLedService.discoverServices();
            }

            public void onTick(long millisUntilFinished) {
                // millisUntilFinished    The amount of time until finished.
            }
        }.start();
0 голосов
/ 16 марта 2020

Извините, что говорю это, но то, что вы делаете в своем ответе на { ссылка }, в корне неверно. Не используйте произвольные таймеры, подобные этому. Во многих случаях он определенно потерпит неудачу, поскольку время радиосвязи может сильно различаться в зависимости от среды.

API BLE в Android основан на обратном вызове. Это означает, что результаты сканирования отображаются как ScanCallbacks . Когда вызывается обратный вызов, и устройство является тем, к которому вы хотите подключиться, ЭТО при подключении.

А при подключении вы предоставляете BluetoothGattCallback и реализует onConnectionStateChange метод. Если state означает, что устройство теперь подключено, то при вызове discoverServices. Обнаружение службы не завершается раньше, чем при поступлении обратного вызова onServicesDiscovered , поэтому сначала вы можете начать транзакции GATT.

И помните, что вы можете иметь только одну ожидающую операцию GATT в время (вам нужно дождаться соответствующего обратного вызова, прежде чем вы сможете выполнить другой).

0 голосов
/ 09 марта 2020

возможно, вам нужно отсканировать и остановить сканирование перед привязкой сервиса. Мой способ сканирования и привязки выглядит следующим образом: 

final BluetoothLeScanner scanner = bluetoothAdapter.getBluetoothLeScanner();
ScanSettings settings = new ScanSettings.Builder()
    .setScanMode(ScanSettings.SCAN_MODE_LOW_LATENCY)
    .build();
List<ScanFilter> filters = new ArrayList<>();
new Handler().postDelayed(new Runnable() {
    @Override
    public void run() {
        scanner.stopScan(scanCallback);
        bindService(new Intent(ControlActivity.this, BLEService.class), 
            mServiceConnection, BIND_AUTO_CREATE);

            }
        }
    }, 3500);

    scanner.startScan(filters, settings, scanCallback);

и для обратного вызова соединения: 

private final ServiceConnection mServiceConnection = new ServiceConnection() {
    @Override
    public void onServiceConnected(ComponentName name, IBinder service) {
        bleService = ((BLEService.LocalBinder) service).getService();
        try {
            bleService.connect(device mac);
        } catch (Exception e) {
            updateText("Connection Disconnected...");
        }
    }

    @Override
    public void onServiceDisconnected(ComponentName name) {
        bleService = null;
    }
};
...