android - 在棉花糖上添加位置权限

Question

我正在编写代码以从位置管理器获取 lastknownlocation，这促使我添加运行时权限。

这是我的代码：

public class MainActivity extends AppCompatActivity implements LocationListener {

    LocationManager locationManager;
    String provider;
    private final int MY_PERMISSIONS_REQUEST_CODE=1;
    Location location;
    Boolean isPermissionGranted=false;
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);

        provider = locationManager.getBestProvider(new Criteria(), false);


       if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {

           if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
               requestPermissions(new String[]{Manifest.permission.ACCESS_FINE_LOCATION,Manifest.permission.ACCESS_COARSE_LOCATION},MY_PERMISSIONS_REQUEST_CODE);
           }

          // return;
        }

    }

    public void getlastknownposition()
    {

    }

    @Override
    public void onLocationChanged(Location location) {

    }

    @Override
    public void onStatusChanged(String provider, int status, Bundle extras) {

    }

    @Override
    public void onProviderEnabled(String provider) {

    }

    @Override
    public void onProviderDisabled(String provider) {

    }


    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);


        if(requestCode == MY_PERMISSIONS_REQUEST_CODE)
        {
            if(grantResults[0]==PackageManager.PERMISSION_GRANTED && grantResults[1]==PackageManager.PERMISSION_GRANTED){

            Toast.makeText(MainActivity.this," granted "+grantResults[0]+"granted2"+grantResults[1], Toast.LENGTH_SHORT).show();


            location = locationManager.getLastKnownLocation(provider);}

        }

    }

}

我仍然收到错误“呼叫需要用户可能拒绝的权限：代码应显式检查权限是否可用（使用checkPermission）或显式处理潜在SecurityException 的onRequestPermissionsResult 在线location = locationManager.getLastKnownLocation(provider);

Answer 1

换行

location = locationManager.getLastKnownLocation(provider);

和

if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED
    && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) == PackageManager.PERMISSION_GRANTED)
{
    location = locationManager.getLastKnownLocation(provider);
}

Answer 2

如果在 onPermissionsResult =) 中，请在第二个周围放置一些大括号

if(requestCode == MY_PERMISSIONS_REQUEST_CODE){
        if(grantResults[0]==PackageManager.PERMISSION_GRANTED && grantResults[1]==PackageManager.PERMISSION_GRANTED){
             Toast.makeText(MainActivity.this," granted "+grantResults[0]+"granted2"+grantResults[1], Toast.LENGTH_SHORT).show();

             location = locationManager.getLastKnownLocation(provider);
        } else {
              //TODO handle user saying NO! :)
        }
    }

提示：如果您请求 FINE_LOCATION，则不需要 COARSE，它已经包含它。