Question

我正在开发一个显示不同电影的应用程序，我的菜单上有三个选项：评分最高，最受欢迎和最喜欢的。

我通过这种方式控制通过布尔显示的电影：

isFavorite = true＆amp;＆amp;是topRated = false =＆gt;显示收藏夹
isFavorite = false＆amp;＆amp; topRated = true =＆gt;显示topRated
isFavorite = false＆amp;＆amp; topRated = false =＆gt;显示最受欢迎的

到目前为止，当我在OnCreate（）上手动设置值时，它可以工作！

当我尝试通过单击菜单的不同选项来更改此值时出现问题...它显示的电影列表与我单击的选项无关。

这是我的onOptionItemSelected（）方法：

public boolean onOptionsItemSelected(MenuItem item) {
    int itemId = item.getItemId();


    switch (itemId){
        case R.id.most_popular:
            setFavorite(false);
            setTopRated(false);
            movieAdapter.notifyDataSetChanged();


            Context context = MainActivity.this;
            String textToShow = "Sorted by most popular";
            Toast.makeText(context, textToShow, Toast.LENGTH_SHORT).show();
            break;

        case R.id.highest_rated:
            setFavorite(false);
            setTopRated(true);

            movieAdapter.notifyDataSetChanged();
            context = MainActivity.this;
            textToShow = "Sorted by rate";
            Toast.makeText(context, textToShow, Toast.LENGTH_SHORT).show();
            break;

        case R.id.favorites:
            setFavorite(true);
            setTopRated(false);

            movieAdapter.notifyDataSetChanged();
            context = MainActivity.this;
            textToShow = "Here is your favorites list";
            Toast.makeText(context, textToShow, Toast.LENGTH_SHORT).show();
            break;

        default:
            Log.w(TAG, "Menu selection is not handled. ItemId;" + itemId);

    }
    return super.onOptionsItemSelected(item);
}

提前致谢：）

Answer 1

我成功解决了我的问题！以下是我的MakeTheQuery（）方法和onOptionItemSelected;

的修改

private void makeTheQuery() {
    movies.clear();
    isFavorite = isFavorite();
    isTopRated = isTopRated();

    URL SearchUrl;
    if (!isTopRated) {
        SearchUrl = NetworkUtils.buildUrl();
    }else{
        SearchUrl = NetworkUtils.buildUrlTopRated();
    }
    new TheMovieAsyncTask().execute(SearchUrl);
}

和

public boolean onOptionsItemSelected(MenuItem item) {
    int itemId = item.getItemId();


    switch (itemId){
        case R.id.most_popular:
            setFavorite(false);
            setTopRated(false);
            movieAdapter.notifyDataSetChanged();
            makeTheQuery();

            Context context = MainActivity.this;
            String textToShow = "Sorted by most popular";
            Toast.makeText(context, textToShow, Toast.LENGTH_SHORT).show();
            break;

        case R.id.highest_rated:
            setFavorite(false);
            setTopRated(true);

            movieAdapter.notifyDataSetChanged();
            makeTheQuery();


            context = MainActivity.this;
            textToShow = "Sorted by rate";
            Toast.makeText(context, textToShow, Toast.LENGTH_SHORT).show();
            break;

        case R.id.favorites:
            setFavorite(true);
            setTopRated(false);

            movieAdapter.notifyDataSetChanged();

            makeTheQuery();

            context = MainActivity.this;
            textToShow = "Here is your favorites list";
            Toast.makeText(context, textToShow, Toast.LENGTH_SHORT).show();
            break;

        default:
            Log.w(TAG, "Menu selection is not handled. ItemId;" + itemId);

    }
    return super.onOptionsItemSelected(item);
}

Answer 2

要使适配器获取新的数据集，您需要在传入新数据之前清除旧数据，然后在完成后通知适配器。您可以使用此movieAdapter.clear();来执行此操作...以下是如何实现它：

    case R.id.highest_rated:
//Clear the adapter whenever this highest rated movie is clicked
                movieAdapter.clear(); //Clear the adapter whenever this highest rated movie is clicked
                setFavorite(false);
                setTopRated(true);

                movieAdapter.notifyDataSetChanged();
                context = MainActivity.this;
                textToShow = "Sorted by rate";
                Toast.makeText(context, textToShow, Toast.LENGTH_SHORT).show();
                break;

android - 在onOptionsItemSelected

2 个答案: