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Java 如何连续显示可编程设备的RSSI?_Java_Android_Bluetooth Lowenergy_Rssi - Fatal编程技术网

Java 如何连续显示可编程设备的RSSI?

Java 如何连续显示可编程设备的RSSI?,java,android,bluetooth-lowenergy,rssi,Java,Android,Bluetooth Lowenergy,Rssi,我正在尝试实现一个android应用程序,它可以扫描可扩展设备。因为我需要一些信标的距离信息,所以我想连续读取RSSI。目前我可以显示RSSI,但该值不变。应用程序读取该值一次,不更新该值。我使用来自gitHub的示例BLE应用程序作为基础 这是我的蓝牙设备: class DeviceHolder{ BluetoothDevice device; int rssi; public DeviceHolder(BluetoothDevice device, int rss

我正在尝试实现一个android应用程序,它可以扫描可扩展设备。因为我需要一些信标的距离信息,所以我想连续读取RSSI。目前我可以显示RSSI,但该值不变。应用程序读取该值一次,不更新该值。我使用来自gitHub的示例BLE应用程序作为基础

这是我的蓝牙设备:

  class DeviceHolder{
    BluetoothDevice device;
    int rssi;
    public DeviceHolder(BluetoothDevice device, int rssi){
        this. device = device;
        this.rssi = rssi;
    }
}
列表适配器:

 private class LeDeviceListAdapter extends BaseAdapter {
    private ArrayList<BluetoothDevice> mLeDevices;
    private ArrayList<DeviceHolder> mLeHolders;
    private LayoutInflater mInflator;

    public LeDeviceListAdapter() {
        super();
        mLeDevices = new ArrayList<BluetoothDevice>();
        mLeHolders = new ArrayList<DeviceHolder>();
        mInflator = DeviceScanActivity.this.getLayoutInflater();
    }
    public void addDevice(DeviceHolder deviceHolder) {
        if(!mLeDevices.contains(deviceHolder.device)) {
            mLeDevices.add(deviceHolder.device);
            mLeHolders.add(deviceHolder);
        }
    }
BluetoothLeService活动中的Bluetooth GattCallback如下所示:

private final BluetoothGattCallback mGattCallback = new BluetoothGattCallback() {
    @Override
    public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) {
        String intentAction;
        if (newState == BluetoothProfile.STATE_CONNECTED) {
            intentAction = ACTION_GATT_CONNECTED;
            mConnectionState = STATE_CONNECTED;
            boolean rssiStatus = mBluetoothGatt.readRemoteRssi();
            broadcastUpdate(intentAction);
            Log.i(TAG, "Connected to GATT server.");
            // Attempts to discover services after successful connection.
            Log.i(TAG, "Attempting to start service discovery:" +
                    mBluetoothGatt.discoverServices());

        } else if (newState == BluetoothProfile.STATE_DISCONNECTED) {
            intentAction = ACTION_GATT_DISCONNECTED;
            mConnectionState = STATE_DISCONNECTED;
            Log.i(TAG, "Disconnected from GATT server.");
            broadcastUpdate(intentAction);
        }
    }

    @Override
    public void onServicesDiscovered(BluetoothGatt gatt, int status) {
        if (status == BluetoothGatt.GATT_SUCCESS) {
            broadcastUpdate(ACTION_GATT_SERVICES_DISCOVERED);
        } else {
            Log.w(TAG, "onServicesDiscovered received: " + status);
        }
    }

    @Override
    public void onCharacteristicRead(BluetoothGatt gatt,
                                     BluetoothGattCharacteristic characteristic,
                                     int status) {
        if (status == BluetoothGatt.GATT_SUCCESS) {
            broadcastUpdate(ACTION_DATA_AVAILABLE, characteristic);
        }
    }

    @Override
    public void onCharacteristicChanged(BluetoothGatt gatt,
                                        BluetoothGattCharacteristic characteristic) {
        broadcastUpdate(ACTION_DATA_AVAILABLE, characteristic);
    }

    public void onReadRemoteRssi(BluetoothGatt gatt,
                                 int rssi, int status){
        super.onReadRemoteRssi(gatt, rssi, status);
        if (status == BluetoothGatt.GATT_SUCCESS) {
            Log.d(TAG, String.format("BluetoothGatt ReadRssi[%d]", rssi));
        } else {
            Log.w(TAG, "onReadRemoteRssi received: " + status);
        }
        broadcastUpdate(ACTION_RSSI_VALUE_READ, rssi);

    }
};

private void broadcastUpdate(final String action) {
    final Intent intent = new Intent(action);
    sendBroadcast(intent);
}

private void broadcastUpdate(final String action, int rssi){
    Log.d(TAG, "broadcastUpdate - rssi");
    final Intent intent = new Intent(action);
    intent.putExtra(DeviceControlActivity.EXTRAS_DEVICE_RSSI, rssi);
    intent.setAction(ACTION_RSSI_VALUE_READ);
    sendBroadcast(intent);
}
我查阅了互联网和Stackoverflow以寻求指导,但提供的解决方案对我并不适用。我使用的是三星Galaxy S5和安卓6.01。 是否有人提示如何连续显示未连接设备的RSSI(扫描时)?任何关于错误实现的提示都是受欢迎的

非常感谢你的帮助

萨尤斯


PS:onReadRemoteRssi的实现是因为我想在连接设备时读取RSSI。此功能在此时并不重要,只是很好地拥有它。

您的应用程序只读取一次RSSI值,并且不会更新它,因为当您向适配器中添加新的
Bluetooth设备时,它会检查它是否已经包含RSSI值

    if(!mLeDevices.contains(deviceHolder.device)) {
        mLeDevices.add(deviceHolder.device);
        mLeHolders.add(deviceHolder);
    }

相反,我会创建一个
映射
来更新设备的rssi值:
mDeviceRssi.put(设备,rssi)

非常感谢您的回答!现在我明白了问题所在。我也明白我应该只更新列出的设备。由于我是android开发新手,如果您能提供更多关于Map的信息以及如何在我的代码中使用它,我将非常感激。一个有用的链接也就足够了。再次非常感谢!
    if(!mLeDevices.contains(deviceHolder.device)) {
        mLeDevices.add(deviceHolder.device);
        mLeHolders.add(deviceHolder);
    }