Android Bluetooth广播接收器未发现设备
我梳理了论坛,试图找出我的蓝牙广播接收器不工作的原因,我所能找到的只是人们说要确保请求粗略/精细的位置权限。我已经在这里这样做了(方法在发现方法之前被调用): 请求权限Android Bluetooth广播接收器未发现设备,android,bluetooth,android-bluetooth,Android,Bluetooth,Android Bluetooth,我梳理了论坛,试图找出我的蓝牙广播接收器不工作的原因,我所能找到的只是人们说要确保请求粗略/精细的位置权限。我已经在这里这样做了(方法在发现方法之前被调用): 请求权限 private void requestPermissions() { final int CODE = 5; // app defined constant used for onRequestPermissionsResult boolean allPermissionsGranted = true;
private void requestPermissions()
{
final int CODE = 5; // app defined constant used for onRequestPermissionsResult
boolean allPermissionsGranted = true;
String[] permissionsToRequest =
{
Manifest.permission.BLUETOOTH_ADMIN,
Manifest.permission.BLUETOOTH,
Manifest.permission.ACCESS_FINE_LOCATION,
Manifest.permission.ACCESS_COARSE_LOCATION
};
for(String permission : permissionsToRequest)
{
allPermissionsGranted = allPermissionsGranted &&
(ContextCompat.checkSelfPermission(this, permission)
== PackageManager.PERMISSION_GRANTED);
}
if(!allPermissionsGranted)
{
ActivityCompat.requestPermissions(this, permissionsToRequest, CODE);
}
}
问题是,我的BroadcastReceiver从未找到其他可发现的设备,如果设备已配对,它会按预期将其放入ListView,但一旦设备未配对,它就无法再次识别它。请参见下面的屏幕截图
我现在不知所措,感觉好像我已经尝试了一切,如果有人有任何想法你可以救我的命,我会永远感激你
谢谢
广播接收机
private final BroadcastReceiver broadcastReceiver = new BroadcastReceiver()
{
@Override
public void onReceive(Context context, Intent intent)
{
String action = intent.getAction();
if(BluetoothDevice.ACTION_FOUND.equals(action))
{
BluetoothDevice btDevice = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
if(btDevice.getBondState() != BluetoothDevice.BOND_BONDED)
{
newDevicesArrayAdapter.add(btDevice.getName() + "\n" + btDevice.getAddress());
}
}
else if(BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action))
{
setTitle(R.string.select_device);
if(newDevicesArrayAdapter.getCount() == 0)
{
newDevicesArrayAdapter.clear();
String noDevices = getResources().getText(R.string.none_found).toString();
newDevicesArrayAdapter.add(noDevices);
}
}
}
};
onCreate-设置ListView元素和IntentFilter
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_choose_machine);
setResult(Activity.RESULT_CANCELED);
pairedDevicesArrayAdapter = new ArrayAdapter<String>(this, R.layout.device_name);
newDevicesArrayAdapter = new ArrayAdapter<String>(this, R.layout.device_name);
ListView pairedListView = (ListView) findViewById(R.id.paired_devices);
ListView newDevicesListView = (ListView) findViewById(R.id.new_devices);
pairedListView.setAdapter(pairedDevicesArrayAdapter);
pairedListView.setOnItemClickListener(deviceClickListener);
newDevicesListView.setAdapter(pairedDevicesArrayAdapter);
newDevicesListView.setOnItemClickListener(deviceClickListener);
IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
registerReceiver(broadcastReceiver, filter);
filter = new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
registerReceiver(broadcastReceiver, filter);
}
原来我只是太傻了,两个列表视图都更新了值,所以我从来没有看到过其他设备的列表
pairedListView.setAdapter(pairedDevicesArrayAdapter);
pairedListView.setOnItemClickListener(deviceClickListener);
newDevicesListView.setAdapter(pairedDevicesArrayAdapter);
newDevicesListView.setOnItemClickListener(deviceClickListener);
应该是:
pairedListView.setAdapter(pairedDevicesArrayAdapter);
pairedListView.setOnItemClickListener(deviceClickListener);
newDevicesListView.setAdapter(newDevicesArrayAdapter);
newDevicesListView.setOnItemClickListener(deviceClickListener);
pairedListView.setAdapter(pairedDevicesArrayAdapter);
pairedListView.setOnItemClickListener(deviceClickListener);
newDevicesListView.setAdapter(newDevicesArrayAdapter);
newDevicesListView.setOnItemClickListener(deviceClickListener);