bluetoothAdapter.startDiscovery();搜索不到设备

[雕·不懒惰]

项目需求手机之间蓝牙通信，一个client，一个server，另有自己手机华为

client代码如下
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.bluetooth_list);
Butterknife.bind(this);

.......

registReceiver();
getBlueList();

}
private void getBlueList() {
new Thread(new Runnable() {
@Override
public void run() {
if (bluetoothAdapter.isDiscovering())
bluetoothAdapter.cancelDiscovery();
bluetoothAdapter.startDiscovery();
}
}).start();
}

private void registReceiver() {
IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction(BluetoothDevice.ACTION_FOUND);
intentFilter.addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
intentFilter.addAction(BluetoothDevice.ACTION_ACL_CONNECTED);
intentFilter.addAction(BluetoothDevice.ACTION_ACL_DISCONNECTED);
registerReceiver(broadcastReceiver, intentFilter);
}

private BroadcastReceiver broadcastReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
if (intent == null)
return;

BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
if (device != null) {
LogUtils.e(" getAddress: " + device.getAddress() + " name: " + device.getName());
names.add(device.getAddress());
}
if (TextUtils.equals(intent.getAction(), BluetoothAdapter.ACTION_DISCOVERY_FINISHED)) {
if (names.size() == 0) {
Toast.makeText(BlueClientActivity.this, "未发现可连接的蓝牙设备", Toast.LENGTH_SHORT).show();
} else {
arrayAdapter.notifyDataSetChanged();
}
}
LogUtils.e没有输出，说明device=null，在系统设置蓝牙里面列表里有华为，但是代码里面就是搜索不到任何设备

[usecf]

有没有开定位gps

[雕·不懒惰]

引用 1 楼 usecf 的回复:

有没有开定位gps

手机也是root过了的

[ink_s]

4.0蓝牙的话用的下边的方法搜索
mBluetoothLeScanner.startScan(leCallback);
mBluetoothAdapter.startLeScan(mLeScanCallback);

Android6.0以上的话除了要定位权限，还要手动把GPS图标打开
Intent locationIntent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
this.startActivityForResult(locationIntent, REQUEST_CODE_LOCATION_SETTINGS);

[雕·不懒惰]

引用 3 楼 ink_s 的回复:

4.0蓝牙的话用的下边的方法搜索
mBluetoothLeScanner.startScan(leCallback);
mBluetoothAdapter.startLeScan(mLeScanCallback);

Android6.0以上的话除了要定位权限，还要手动把GPS图标打开
Intent locationIntent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
this.startActivityForResult(locationIntent, REQUEST_CODE_LOCATION_SETTINGS);

不是蓝牙4.0

[zhang106209]

打开定位的权限

[雕·不懒惰]

引用 5 楼 zhang106209 的回复:

打开定位的权限

上面说了已经开了权限并且手机是root过了的

[usecf]

估计要动态申请权限才行 @Override public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) { switch (requestCode) { case 110: if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) { isScanning = true; if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) { bleScanner.startScan(scanCallback); } } else Toast.makeText(this, "没有获取到定位权限", Toast.LENGTH_LONG).show(); break; } }

[雕·不懒惰]

引用 7 楼 usecf 的回复:

估计要动态申请权限才行
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {

switch (requestCode) {
case 110:
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {

isScanning = true;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
bleScanner.startScan(scanCallback);
}
} else
Toast.makeText(this, "没有获取到定位权限", Toast.LENGTH_LONG).show();
break;

}
}

动态申请了的

[SimPong]

引用 3 楼 ink_s 的回复:

4.0蓝牙的话用的下边的方法搜索 mBluetoothLeScanner.startScan(leCallback); mBluetoothAdapter.startLeScan(mLeScanCallback); Android6.0以上的话除了要定位权限，还要手动把GPS图标打开 Intent locationIntent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS); this.startActivityForResult(locationIntent, REQUEST_CODE_LOCATION_SETTINGS);

手动打开GPS，真的是帮大忙了找了老半天结果居然是因为这个

[Jiesen_Wang]

卧槽，别人的手机都行，就只有一个不行，原来是位置功能没有打开

[qq_43203662]

遇到同样的问题，可惜解决后才看到这个。本来在手机上调试没点问题，换平板调试就出现这个问题了，要把平板定位图标打开才行。手机不打开也没事，可能是华为平板的原因？虽然不知道蓝牙扫描为什么要开定位，平板自带的蓝牙设置打开就能扫描到新设备，不需要开定位，不知道具体原因，反正解决了就完了