安卓开发 如何获取可连接的蓝牙设备列表

芋圆圆又圆
  • 0
新手上路,请多包涵

在stackoverflow上看到这段代码,似乎是可用的
但用我自己手机试验无法显示周围的设备
是有什么权限没有给到吗
mainActivity.java

public class MainActivity extends AppCompatActivity {
    ListView listView;
    private BluetoothAdapter BA;
    private ArrayList<String> mDeviceList = new ArrayList<String>();
    private Set<BluetoothDevice> pairedDevices;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        listView=(ListView)findViewById(R.id.devicesList);

        BA = BluetoothAdapter.getDefaultAdapter();
        BA.startDiscovery();
        IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
        registerReceiver(mReceiver, filter);

    }

    private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();
            if (BluetoothDevice.ACTION_FOUND.equals(action)) {
                BluetoothDevice device = intent
                        .getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                mDeviceList.add(device.getName() + "\n" + device.getAddress());
                Log.i("BT1", device.getName() + "\n" + device.getAddress());
                listView.setAdapter(new ArrayAdapter<String>(context,
                        android.R.layout.simple_list_item_1, mDeviceList));
            }
        }
    };


    @Override
    protected void onDestroy() {
        unregisterReceiver(mReceiver);
        super.onDestroy();
    }


}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">


    <ListView
        android:id="@+id/devicesList"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:visibility="visible" />

</LinearLayout>

AndroidManifest.xml

    <uses-permission android:name="android.permission.BLUETOOTH" />
    <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <uses-permission android:name="android.permission.BLUETOOTH_CONNECT" />
    <permission android:name="android.permission.BLUETOOTH" android:label="BLUETOOTH" />
    <permission android:name="android.permission.BLUETOOTH_ADMIN" />
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