Android 6.0 扫描不到 Ble 设备需开启位置权限的方法

<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>

private static final int REQUEST_CODE_ACCESS_COARSE_LOCATION = 1;
...
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {//如果 API level 是大于等于 23(Android 6.0) 时
 //判断是否具有权限
 if (ContextCompat.checkSelfPermission(this,
   Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
  //判断是否需要向用户解释为什么需要申请该权限
  if (ActivityCompat.shouldShowRequestPermissionRationale(this,
    Manifest.permission.ACCESS_COARSE_LOCATION)) {
   showToast("自Android 6.0开始需要打开位置权限才可以搜索到Ble设备");
  }
  //请求权限
  ActivityCompat.requestPermissions(this,
    new String[]{Manifest.permission.ACCESS_COARSE_LOCATION},
    REQUEST_CODE_ACCESS_COARSE_LOCATION);
 }
}

@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
 if (requestCode == REQUEST_CODE_ACCESS_COARSE_LOCATION) {
  if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
   //用户允许改权限，0表示允许，-1表示拒绝 PERMISSION_GRANTED = 0， PERMISSION_DENIED = -1
   //permission was granted, yay! Do the contacts-related task you need to do.
   //这里进行授权被允许的处理
  } else {
   //permission denied, boo! Disable the functionality that depends on this permission.
   //这里进行权限被拒绝的处理
  }
 } else {
  super.onRequestPermissionsResult(requestCode, permissions, grantResults);
 }
}

/**
 * Location service if enable
 *
 * @param context
 * @return location is enable if return true, otherwise disable.
 */
public static final boolean isLocationEnable(Context context) {
 LocationManager locationManager = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
 boolean networkProvider = locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
 boolean gpsProvider = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
 if (networkProvider || gpsProvider) return true;
 return false;
}

private static final int REQUEST_CODE_LOCATION_SETTINGS = 2;
...
private void setLocationService() {
 Intent locationIntent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
 this.startActivityForResult(locationIntent, REQUEST_CODE_LOCATION_SETTINGS);
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
 if (requestCode == REQUEST_CODE_LOCATION_SETTINGS) {
  if (isLocationEnable(this)) {
   //定位已打开的处理
  } else {
   //定位依然没有打开的处理
  }
 } else super.onActivityResult(requestCode, resultCode, data);
}