我正在尝试连续显示蓝牙设备并在屏幕上显示它们，但它从来没有向我显示所有设备，而是一次只显示 1 个。我找不到我做错了什么。这是我的代码，也许您可​​以在其中找到任何问题。谢谢

class monitorBluetooth extends monitor {
private ListView mLvDevices;
private ArrayList<String> mDeviceList = new ArrayList<String>();

public monitorBluetooth(service service) {

super(service);
    bluetooth = BluetoothAdapter.getDefaultAdapter();

this.bReceiver = new  BluetoothReceiver();
}

public void finalize() throws Throwable {

super.finalize();
}

public void run() {        

    IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
    service.registerReceiver(this.bReceiver, filter);

if(service != null) {
        bluetooth = BluetoothAdapter.getDefaultAdapter();
        bluetooth.startDiscovery();
 }       
}
class BluetoothReceiver extends BroadcastReceiver {
public void onReceive(Context context, Intent intent) {
    Set<BluetoothDevice> pairedDevices = bluetooth.getBondedDevices();

    String action = intent.getAction();

    if(BluetoothDevice.ACTION_FOUND.equals(action)) {
    BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
    String uuid = intent.getStringExtra(BluetoothDevice.EXTRA_UUID);
    int rssi = intent.getShortExtra(BluetoothDevice.EXTRA_RSSI,Short.MIN_VALUE);
     mDeviceList.add(device.getAddress() + ", " + device.getName()); // get mac address

            ArrayAdapter<String> adapter = new ArrayAdapter<String>(getApplicationContext(), android.R.layout.simple_list_item_1, mDeviceList);
            mLvDevices.setAdapter(adapter);
    }

    }

}
}

BluetoothAdapter bluetooth;
private BluetoothReceiver bReceiver;

最佳答案

尝试以下顺序:

public void displayDetectedDevices(){
    mBluetoothAdapter.startDiscovery();

    // Create a BroadcastReceiver for ACTION_FOUND
    mReceiver = new BroadcastReceiver() {
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();
            // When discovery finds a device
            if(BluetoothDevice.ACTION_FOUND.equals(action)){
                BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                String deviceName = device.getName();
                String deviceAddress = device.getAddress();
                String s = " ";
                unpairedDevices.add(deviceName + s + deviceAddress +" \n");
                unpairedDevicesList = new ArrayList<String>(unpairedDevices);
                Toast.makeText(getActivity(), unpairedDevicesList.toString(), Toast.LENGTH_LONG).show();
            }
        }
    };
}

请记住在 onCreate() 中声明以下内容:

public void onCreate(Bundle savedInstance){
    super.onCreate(savedInstance);
    unpairedDevicesList = new ArrayList<String>();
    unpairedDevices = new HashSet<String>();
}

记住 #2 在 onCreate() 之前声明以下内容:

ArrayList<String> unpairedDevicesList;
Set<String> unpairedDevices;

最后的想法:

我同时使用了 Set和一个 arrayList将检测到的设备放入。一个集合将不包含重复项。根据您要执行的操作，同时定义两者会有所帮助，因为它们提供不同的功能。还有 here是我的 github 页面，它包含更多信息和一个完整的蓝牙应用程序。

随着集合的填充，设备将开始填充屏幕，具体取决于您希望 UI 的工作方式。我使用了一个简单的列表。

关于android - 找不到所有蓝牙设备android，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/26158213/