Android M onRequestPermissionsResult in non-Activity

Question

I have an application which needs to find the user location, and location is fetched in various classes, so i have written a separate class(Not an Activity

Answer 1

1- create a transparent activity

2- customize your activity

public class CheckStoragePermissionsActivity extends AppCompatActivity {

    private String[] permissions;
    private int pCode = 12321;
    public static PermissionListener permissionListener;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        checkPermissions();
    }

    private void checkPermissions() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {

            permissions = new String[]{Manifest.permission.READ_EXTERNAL_STORAGE, Manifest.permission.WRITE_EXTERNAL_STORAGE};

            boolean flag = false;
            for (String s : permissions)
                if (checkSelfPermission(s) != PackageManager.PERMISSION_GRANTED)
                    flag = true;

            if (flag) {
                requestPermissions(permissions, pCode);
            } else {
                permissionListener.permissionResult(true);
                finish();
            }
        }else
            finish();
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
        if (requestCode == pCode) {
            boolean flag = true;
            if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.M)
                for (int i = 0, len = permissions.length; i < len; i++)
                    if (grantResults[i] != PackageManager.PERMISSION_GRANTED)
                        flag = false;
            if (flag) {
                if (permissionListener != null)
                    permissionListener.permissionResult(true);
            } else if (permissionListener != null)
                permissionListener.permissionResult(false);
            finish();
        }
    }
}

3- permissionListener is an static interface and can be set directly before context.startActivity(...), or use your plan to found permission result.

public interface PermissionListener extends Serializable {
    void permissionResult(boolean hasPermission);
}

4- finally call context.startActivity(new Intent(context, CheckStoragePermissionsActivity.class));

CheckStoragePermissionsActivity do all of needed and finish after user Allow or Deny action.