Question

我正在制作一个使用BLE的Android应用程序。我试图在点击按钮时将数据写入特征，但无法执行此操作。

我有一个具有两个特征的服务，在这两个特征之外我在按钮点击上写一个数据。

Ble class我已经定义了writeDatatoCharacteristic

/* set new value for particular characteristic */
public void writeDataToCharacteristic(final BluetoothGattCharacteristic ch, final byte[] value) {

    if (mBluetoothAdapter == null || mBluetoothGatt == null || ch == null) {
        return;
    }

    // first set it locally....
    ch.setValue(value);


    // ... and then "commit" changes to the peripheral
    mBluetoothGatt.writeCharacteristic(ch);
}

按钮的

<ImageButton android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/imageButtonPlay" android:src="@drawable/play" android:background="@android:color/transparent" android:layout_alignTop="@+id/ivRestart" android:layout_centerHorizontal="true" android:onClick="onClickWrite"/>

我将调用数据写入特征函数的主要活动

public class Tens_modes extends AppCompatActivity { private final String LOGTAG = "BLETEST"; private final String TARGET = "CC2650 SensorTag"; private BleWrapper mBleWrapper = null; private mSensorState mState; private String gattList = ""; private TextView mTv; private enum mSensorState {IDLE, ACC_ENABLE, ACC_READ}; public final static UUID UUID_ACC_SERV = fromString("FFE0"), UUID_ACC_DATA = fromString("f000aa11-0451-4000-b000-000000000000"), UUID_ACC_CONF = fromString("FFE9"), // 0: disable, 1: enable UUID_ACC_PERI = fromString("f000aa13-0451-4000-b000-000000000000"); // Period in tens of milliseconds private ImageButton play; private ImageButton pause; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.tens_modes); play = (ImageButton)findViewById(R.id.imageButtonPlay); pause = (ImageButton)findViewById(R.id.imageButtonPause); play.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { play.setVisibility(View.INVISIBLE); pause.setVisibility(View.VISIBLE); pause.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { pause.setVisibility(View.INVISIBLE); play.setVisibility(View.VISIBLE); //Ble stuff mBleWrapper = new BleWrapper(this, new BleWrapperUiCallbacks.Null() { @Override public void uiDeviceFound(final BluetoothDevice device, final int rssi, final byte[] record) { Log.d(LOGTAG, "uiDeviceFound: " + device.getName() + ", " + rssi + ", " + record.toString()); if (device.getName().equals(TARGET)) { if (!mBleWrapper.connect(device.getAddress())) { Log.d(LOGTAG, "uiDeviceFound: Problem connecting to remote device."); } } //stopScan(); } @Override public void uiDeviceConnected(BluetoothGatt gatt, BluetoothDevice device) { Log.d(LOGTAG, "uiDeviceConnected: State = " + mBleWrapper.getAdapter().getState()); } @Override public void uiDeviceDisconnected(BluetoothGatt gatt, BluetoothDevice device) { Log.d(LOGTAG, "uiDeviceDisconnected: State = " + mBleWrapper.getAdapter().getState()); } @Override public void uiAvailableServices(BluetoothGatt gatt, BluetoothDevice device, List<BluetoothGattService> services) { BluetoothGattCharacteristic c; BluetoothGattDescriptor d; for (BluetoothGattService service : services) { String serviceName = BleNamesResolver.resolveUuid(service.getUuid().toString()); Log.e(LOGTAG, serviceName); gattList += serviceName + "\n"; mBleWrapper.getCharacteristicsForService(service); } // enable services Log.e(LOGTAG, "uiAvailableServices: Enabling services"); c = gatt.getService(UUID_ACC_SERV).getCharacteristic(UUID_ACC_CONF); mBleWrapper.writeDataToCharacteristic(c, new byte[] {0300000000AA}); //mState = mSensorState.ACC_ENABLE; // set notification on characteristic //Log.d(LOGTAG, "uiAvailableServices: Setting notification"); //c = gatt.getService(UUID_IRT_SERV).getCharacteristic(UUID_IRT_DATA); //mBleWrapper.setNotificationForCharacteristic(c, true); // enable notification on descriptor //d = c.getDescriptor(UUID_CCC_DESC); //d.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE); //gatt.writeDescriptor(d); } @Override public void uiCharacteristicForService( BluetoothGatt gatt, BluetoothDevice device, BluetoothGattService service, List<BluetoothGattCharacteristic> chars) { super.uiCharacteristicForService(gatt, device, service, chars); for (BluetoothGattCharacteristic c : chars) { String charName = BleNamesResolver.resolveCharacteristicName(c.getUuid().toString()); Log.d(LOGTAG, charName); gattList += "Characteristic: " + charName + "\n"; } } @Override public void uiSuccessfulWrite( BluetoothGatt gatt, BluetoothDevice device, BluetoothGattService service, BluetoothGattCharacteristic ch, String description) { BluetoothGattCharacteristic c; super.uiSuccessfulWrite(gatt, device, service, ch, description); Log.d(LOGTAG, "uiSuccessfulWrite"); switch (mState) { case ACC_ENABLE: Log.d(LOGTAG, "uiSuccessfulWrite: Reading acc"); c = gatt.getService(UUID_ACC_SERV).getCharacteristic(UUID_ACC_DATA); mBleWrapper.requestCharacteristicValue(c); mState = mSensorState.ACC_READ; break; case ACC_READ: Log.d(LOGTAG, "uiSuccessfulWrite: state = ACC_READ"); break; default: break; } } @Override public void uiFailedWrite( BluetoothGatt gatt, BluetoothDevice device, BluetoothGattService service, BluetoothGattCharacteristic ch, String description) { super.uiFailedWrite(gatt, device, service, ch, description); Log.d(LOGTAG, "uiFailedWrite"); } @Override public void uiNewValueForCharacteristic(BluetoothGatt gatt, BluetoothDevice device, BluetoothGattService service, BluetoothGattCharacteristic ch, String strValue, int intValue, byte[] rawValue, String timestamp) { super.uiNewValueForCharacteristic(gatt, device, service, ch, strValue, intValue, rawValue, timestamp); Log.d(LOGTAG, "uiNewValueForCharacteristic"); for (byte b:rawValue) { Log.d(LOGTAG, "Val: " + b); } } @Override public void uiGotNotification( BluetoothGatt gatt, BluetoothDevice device, BluetoothGattService service, BluetoothGattCharacteristic characteristic) { super.uiGotNotification(gatt, device, service, characteristic); String ch = BleNamesResolver.resolveCharacteristicName(characteristic.getUuid().toString()); Log.d(LOGTAG, "uiGotNotification: " + ch); } }); } public void onClickWrite(View v){ if(mBleWrapper != null) { // enable services Log.e(LOGTAG, "uiAvailableServices: Enabling services"); byte[] value = new byte[1]; value[0] = (byte)21; mBleWrapper.writeDataToCharacteristic(UUID_ACC_CONF, new byte[] {0300000000AA}); } }

我想写0300000000AA作为特征值，但不知道如何做到这一点。在过去的4,5个小时内搜索它但没有得到任何有用的东西

如果有人能帮助我，请告诉我我做错了什么感谢

Answer 1

这应该为你做。（好一个开始，我不确定编码）

byte[] temp;
//This will at least compile, however I don't know if that is what you want, strings in java are unicode, not ascii. you might have to convert to your desired encoding
temp = "0300000000AA".getBytes();
mBleWrapper.writeDataToCharacteristic(UUID_ACC_CONF, temp );

如何在按钮点击时将数据写入特征？

1 个答案: