java - Adapter中startActivityForResult返回时获取onActivityResult

Question

当用户从 Activity 中点击返回时，我试图返回一些数据。

我正在从适配器调用 startActivityForResult，但是当我实际从 Activity 按下时，onActivityResult 似乎从未被调用

例如，代码被精简

fragment 1

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    View mainView = inflater.inflate(R.layout.grid_view, container, false);

    return mainView;
}

@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);

    mAdapter = new Adapter(this.getActivity(), new ArrayList<Item>());
    mGridView = (StaggeredGridView) getView().findViewById(R.id.grid_view);
    mGridView.setAdapter(mAdapter);
}

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    Log.w(TAG, "in activity result");
    if (requestCode == 1 && resultCode == Activity.RESULT_OK) {
    }

适配器

public Adapter(Context context, List<Item> objects) {
    super(context, -1, objects);
    this.context = context;
    addAll(objects);
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    View view = convertView;
    if (view == null) {
        LayoutInflater inflater = (LayoutInflater) context.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
        view = inflater.inflate(R.layout.grid_view_item, parent, false);
    }

View recommendationLayout = view.findViewById(R.id.recommendation_layout);
    recommendationLayout.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent intent = new Intent(getContext(), Activity.class);
            Bundle extras = new Bundle();
            extras.putBoolean("denyEditPermission", true);
            intent.putExtras(extras);

            ((Activity) context).((Activity) context).startActivityForResult(intent, 1);(intent, 1);
        }
    });
    return view;

Activity

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.detailed_view);

    Intent intent = getIntent();
    Bundle extras = intent.getExtras();
    denyEditPermission = extras.getBoolean("denyEditPermission");
}

@Override
public void onBackPressed() {
    Intent intent = new Intent();
    intent.putExtra("denyEditPermission", denyEditPermission);
    setResult(RESULT_OK, intent);
    finish();
}

Answer 1

由于您使用 activity 上下文启动 Activity ，您将在 Activity 中获得 onActivityResult 回调，而不是在 fragment 中。要在 fragment 中获得回调，您需要在 fragment 本身中使用 fragment 上下文/启动 Activity 。我建议使用接口(interface)方法来解决这里的问题。创建一个接口(interface)并在您的 fragment 中实现它，当单击 recommendationLayout 时，从适配器调用接口(interface)方法，以便您可以处理 fragment 中的点击事件本身。

有点像，

创建接口(interface)文件-

public interface RecommendationClickListener {

    public void onRecommendationClicked();
}

fragment :

public class MyFragment extends Fragment implements RecommendationClickListener{
...
...
...

@Override
    public void onRecommendationClicked() {
        Intent intent = new Intent(getActivity(), NextActivity.class);
        Bundle extras = new Bundle();
        extras.putBoolean("denyEditPermission", true);
        intent.putExtras(extras);

        startActivityForResult(intent, 1);

    }

@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);

    mAdapter = new Adapter(this.getActivity(), new ArrayList<Item>());
    mAdapter.setRecommendationClickListener(this);
    mGridView = (StaggeredGridView) getView().findViewById(R.id.grid_view);
    mGridView.setAdapter(mAdapter);
}

适配器:

private RecommendationClickListener mRecommendationClickListener;


    public void setRecommendationClickListener(RecommendationClickListener recommendationClickListener) {
        this.mRecommendationClickListener = recommendationClickListener;
    }

View recommendationLayout = view.findViewById(R.id.recommendation_layout);
    recommendationLayout.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if (mRecommendationClickListener != null) {
                mRecommendationClickListener.onRecommendationClicked();
            }
        }
    });