Question

在我的主要活动中，我有简单的方法，我想在内部适配器中执行，但我的view.getContext()得到错误的类，我不能这样做，

我的活动：

public class UnfoldableDetailsActivity extends AppCompatActivity {

    private View listTouchInterceptor;
    private View detailsLayout;
    private UnfoldableView unfoldableView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_unfoldable_details);

        ListView listView = Views.find(this, R.id.list_view);
        listView.setAdapter(new PaintingsAdapter(this));

        ...
    }

    @Override
    public void onBackPressed() {
        ...
    }

    public void openDetails(View coverView, Painting painting) {
        ...
    }
}

如您所见，我通过以下方式将上下文设置为适配器：

ListView listView = Views.find(this, R.id.list_view);
listView.setAdapter(new PaintingsAdapter(this));

现在在这个适配器中我必须从onClick获得正确的上下文：

public class PaintingsAdapter extends ItemsAdapter<Painting> implements View.OnClickListener {

    public PaintingsAdapter(Context context) {
        super(context);
        setItemsList(Arrays.asList(Painting.getAllPaintings(context.getResources())));
    }

    @Override
    protected View createView(Painting item, int pos, ViewGroup parent, LayoutInflater inflater) {
        ...
        return view;
    }

    @Override
    protected void bindView(Painting item, int pos, View convertView) {
        ...
    }

    @Override
    public void onClick(View view) {
        Painting item = (Painting) view.getTag(R.id.list_item_image);
        if (view.getContext() instanceof UnfoldableDetailsActivity) {
            ((UnfoldableDetailsActivity) view.getContext()).openDetails(view, item);
        }
    }

    private static class ViewHolder {
        ...
    }
}

view.getContext()返回TintContextWrapper，必须为UnfoldableDetailsActivity且错误

Answer 1

像这样改写：

public class PaintingsAdapter extends ItemsAdapter<Painting> implements View.OnClickListener {
    UnfoldableDetailsActivity parentActivity;

    public PaintingsAdapter(UnfoldableDetailsActivity parentActivity) {
        super(context);
        this.parentActivity = parentActivity;
        setItemsList(Arrays.asList(Painting.getAllPaintings(context.getResources())));
    }

    @Override
    public void onClick(View view) {
        Painting item = (Painting) view.getTag(R.id.list_item_image);
        parentActivity.openDetails(view, item);
    }
}

现在你不再需要施放。

Android如何获取TintContextWrapper上下文而不是父类

1 个答案: