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Android BluetoothDevice.Action_found 广播从未收到

转载 作者：行者123 更新时间：2023-12-02 03:15:18 42 4
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我正在尝试在 ListView 中列出附近所有可用的设备。

我的 list 包含 BLUETOOTH、BLUETOOTH_ADMIN 和 ACCESS_COARSE_LOCATION 的权限。

我的问题是收到了 ACTION_DISCOVERY_STARTED 和 ACTION_DISCOVERY_FINISHED 但没有收到 ACTION_FOUND。我有我的电脑蓝牙可发现，我手机上的蓝牙设备可以发现它，但我的应用程序不能。这同样适用于附近的所有设备。

private BluetoothAdapter mBluetoothAdapter;
private ArrayList<String> mDeviceList;
private ListView mListView;
private ProgressDialog progressDialog;

private static final int REQUEST_ENABLE_BT = 1;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_bluetooth_list);

    //list to hold all devices found
    mDeviceList = new ArrayList<>();

    //list to display all devices found
    mListView = (ListView) findViewById(R.id.availItems);
    mListView.setAdapter(new ArrayAdapter<>(this,
            android.R.layout.simple_list_item_1, mDeviceList));

    //local bluetooth device
    mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();

    // If the adapter is null, then Bluetooth is not supported
    if (mBluetoothAdapter == null) {
        Toast.makeText(this, "Bluetooth is not available", Toast.LENGTH_LONG).show();
    }else if(!mBluetoothAdapter.isEnabled()){
        Intent enableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
        startActivityForResult(enableIntent, REQUEST_ENABLE_BT);
    }

    Set<BluetoothDevice> pairedDevices = mBluetoothAdapter.getBondedDevices();

    if (pairedDevices.size() > 0) {
        for (BluetoothDevice device : pairedDevices) {
            mDeviceList.add(device.getName() + "\n" + device.getAddress());
        }
    }

    progressDialog = new ProgressDialog(this);
    progressDialog.setMessage("Scanning...");
    progressDialog.setTitle("Looking for devices...");
    progressDialog.setCancelable(false);
    progressDialog.setButton(DialogInterface.BUTTON_NEGATIVE, "Cancel", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {
            dialog.dismiss();
        }
    });

    Button findButton = (Button) findViewById(R.id.findButton);
    findButton.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {
            IntentFilter filter = new IntentFilter();

            filter.addAction(BluetoothDevice.ACTION_FOUND);
            filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_STARTED);
            filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);

            registerReceiver(mReceiver, filter);
            mBluetoothAdapter.startDiscovery();
        }
    });
}

private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
    public void onReceive(Context context, Intent intent) {
        String action = intent.getAction();

        if (BluetoothAdapter.ACTION_DISCOVERY_STARTED.equals(action)) {
            progressDialog.show();
        }else if (BluetoothDevice.ACTION_FOUND.equals(action) && mBluetoothAdapter.isDiscovering()) {
            BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
            mDeviceList.add(device.getName() + "\n" + device.getAddress());
        }else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)) {
            progressDialog.dismiss();
        }
    }
};

@Override
protected void onResume() {
    super.onResume();
    registerReceiver(mReceiver, new IntentFilter(BluetoothDevice.ACTION_FOUND));
}

@Override
public void onPause() {
    if (mBluetoothAdapter != null) {
        if (mBluetoothAdapter.isDiscovering()) {
            mBluetoothAdapter.cancelDiscovery();
        }
    }

    super.onPause();
}

@Override
public void onDestroy() {
    unregisterReceiver(mReceiver);
    mListView = null;
    mBluetoothAdapter = null;
    mDeviceList = null;

    super.onDestroy();
}

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