Question

在我的活动中，我正在调用MovieTask AsyncTask。我从doInBackground MovieTask方法中成功解析的服务器获取Json响应。

现在，我的活动中有一个列表视图，我想使用扩展MovieListAdapter的{{1}}填充列表视图。

对于每个视图（即一行），我想填充3 ArrayAdapter s。我正在覆盖TextView getView方法，以填补相同的内容。但我不明白如何将数据从我的活动发送到MovieListAdapter方法到getView方法以填充文本视图？

getView

MovieListAdapter.java

public class MovieTask extends AsyncTask<String, Void, String>{        

    @Override
    protected String  doInBackground(String... urls) {
        //I HAVE GOT THE JSON DATA THAT CONTAINS AN ARRAY..
        //EACH ENTRY IN ARRAY SHOULD BE FILLED IN A SINGLE ROW IN LISTVIEW

        getMovieDataFromJson(result);
    }

    private void getMovieDataFromJson(String JsonString) throws JSONException {

        JSONObject jsonObject = new JSONObject(JsonString);
        JSONArray results = jsonObject.getJSONArray("results");

        for (int i=0; i<results.length(); i++){
            String title = results.getJSONObject(i).getString("original_title");
            String date = results.getJSONObject(i).getString("release_date");
            long id = results.getJSONObject(i).getLong("id");
            double vote = results.getJSONObject(i).getDouble("vote_average");


             //HERE I NEED TO CALL THE GETVIEW METHOD SO THAT IT FILLS THE ROW OF THE LISTVIEW WITH THESE VALUES - title, date and vote
        }
}

Answer 1

setAdapter() AdapterView上的ListView，getView()内部调用AdapterView，并在AdapterView中填充从中返回的视图。

您可能希望阅读并了解Adapter和public class Movie { public long id; public String date; public String title; public double vote; public Movie(long id, String date, String title, double vote) { this.id = id; this.date = date; this.title = title; this.vote = vote; } }的工作原理。来这里阅读一些文档：

您需要做的是：

为您的数据创建一个模型，如：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <TextView
        android:id="@+id/lbl_date"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <TextView
        android:id="@+id/lbl_title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <TextView
        android:id="@+id/lbl_vote"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</LinearLayout>

创建一个布局以显示电影细节，如：
```
Movie
```
更改适配器以处理String而不是public class MovieListAdapter extends ArrayAdapter<Movie > { public MovieListAdapter(Context context, List<Movie> objects) { super(context, 0, objects); } @Override public View getView(int position, View convertView, ViewGroup parent) { if (convertView == null) { convertView = LayoutInflater.from(getContext()).inflate(R.layout.movie_item, parent, false); } ((TextView) convertView.findViewById(R.id.lbl_date)) .setText(getItem(position).date); ((TextView) convertView.findViewById(R.id.lbl_title)) .setText(getItem(position).title); ((TextView) convertView.findViewById(R.id.lbl_vote)) .setText(String.valueOf(getItem(position).vote)); return convertView; } }，如：
```
private void getMovieDataFromJson(String JsonString) throws JSONException {
    JSONObject jsonObject = new JSONObject(JsonString);
    JSONArray results = jsonObject.getJSONArray("results");

    ArrayList<Movie> movies = new ArrayList<>();

    for (int i=0; i<results.length(); i++){
        String title = results.getJSONObject(i).getString("original_title");
        String date = results.getJSONObject(i).getString("release_date");
        long id = results.getJSONObject(i).getLong("id");
        double vote = results.getJSONObject(i).getDouble("vote_average");

        movies.add(new Movie(id, date, title, vote));
    }

    myMoviesListView.setAdapter(new MovieListAdapter(MainActivity.this, movies));
}
```
最后在for循环之后设置适配器，如：
```
{{1}}
```

覆盖ArrayAdapter的getView以填充3个Textviews

1 个答案: