获取非活动类的onActivityResult (Android)

public interface Callback {
    void onResult(int resultCode, Intent data);
}

public class MainActivity extends AppCompatActivity {
    private Callback callback;

    // ...

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (callback != null) {
            callback.onResult(resultCode, data);
        }
    }

    public void setCallback(Callback callback) {
        this.callback = callback;
    }
}

public class NonActivityClass implements Callback {
    private MainActivity activity;

    public NonActivityClass(MainActivity activity) {
        this.activity = activity;
        this.activity.setCallback(this);
    }

    @Override
    public void onResult(int resultCode, Intent data) {
        // 处理返回的结果
    }

    // 在需要获取结果的地方调用接口的方法
    public void getResult() {
        // 调用活动类的方法，触发onActivityResult()回调
        // 结果将通过onResult()方法返回
        activity.startActivityForResult(intent, requestCode);
    }
}