解析Android Studio ListView

伙计们，我只是想从一个解析查询创建一个对象的列表视图。所以我对android中的列表视图知之甚少，但有人能告诉我如何实现它吗？或者你有没有教程可以解释我应该做什么

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多谢各位

ListView是显示可滚动项目列表的视图组。列表项使用适配器自动插入到列表中，适配器从源（如数组或数据库查询）提取内容，并将每个项结果转换为放置到列表中的视图

因此，使用

listview

元素在xml文件中创建listview 比如说

<ListView
  android:id="@android:id/list"
  android:layout_width="match_parent"
  android:layout_height="wrap_content" >
</ListView> 

这将把值数组中的所有项填充到列表中

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有关更多示例和教程，我将向您展示我是如何做到这一点的。首先，我不会使用

query.findInBackground（）

y将使用

query.find（）

返回所需对象的列表。要使用

query.find（）

您必须在要在其中创建listview的活动或片段中创建

AsyncTask

类

    /* the arraylist of RowItemChapter is becouse im making use of a 
    * custom adapter for my listview
    */
    ArrayList<RowItemChapter> grupos;
    ParseObject course;
    // this list is the one whe are going to use to save what the query gives back
    List<ParseObject> ob;
    ProgressDialog mProgressDialog;
    // this would be my custo adater
    ChaptersAdapter adapter;
    // this is my expandableListView
    ExpandableListView listView;

// RemoteDataTask AsyncTask
    class RemoteDataTask extends AsyncTask<Void, Void, Void> {
        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            // Create a progressdialog
            mProgressDialog = new ProgressDialog(getActivity());
            // Set progressdialog title
            mProgressDialog.setTitle("Looking for Chapters");
            // Set progressdialog message
            mProgressDialog.setMessage("Loading...");
            mProgressDialog.setIndeterminate(false);
            // Show progressdialog
            mProgressDialog.show();
        }

        @Override
        protected Void doInBackground(Void... params) {
            // Create the array
            grupos = new ArrayList<RowItemChapter>();
            try {

                // Locate the class table named "Chapters"
                ParseQuery<ParseObject> query = new ParseQuery<ParseObject>("Chapters");
                // look only for objects witch column is equal to the ParseObject course.
                query.whereEqualTo("Curso", course);
                // get data in an ascending list
                query.orderByAscending("position");
                // execute the query and get back a list of the data you where looking for
                ob = query.find();
                // make a for inside the list and set the data to the adapter
                for (ParseObject chapter : ob) {
                    // Locate images in flag column
                    RowItemChapter item = new RowItemChapter((String) chapter.get("name"), new SubrowItemChapter(10 , 5, 80), 80);
                    grupos.add(item);
                }
            } catch (ParseException e) {
                Log.e("Error", e.getMessage());
                e.printStackTrace();
            }
            return null;
        }

        @Override
        protected void onPostExecute(Void result) {
            // Locate the listview in the XML 
            listView = (ExpandableListView) getActivity().findViewById(R.id.listaChapters);
            // Pass the results into ListViewAdapter.java
            adapter = new ChaptersAdapter(getActivity(), grupos);
            // Binds the Adapter to the ListView
            listView.setAdapter(adapter);
            // Close the progressdialog
            mProgressDialog.dismiss();
        }
    }

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您可能不需要知道我所做的是从我所做的项目中提取的，如果您不使用任何自定义适配器，那就更容易了。希望对您有所帮助。

在谷歌上搜索并从教程中学习您可以从这里开始developer.android.com您可以提供本教程的链接或在github中共享项目链接吗？

    /* the arraylist of RowItemChapter is becouse im making use of a 
    * custom adapter for my listview
    */
    ArrayList<RowItemChapter> grupos;
    ParseObject course;
    // this list is the one whe are going to use to save what the query gives back
    List<ParseObject> ob;
    ProgressDialog mProgressDialog;
    // this would be my custo adater
    ChaptersAdapter adapter;
    // this is my expandableListView
    ExpandableListView listView;

// RemoteDataTask AsyncTask
    class RemoteDataTask extends AsyncTask<Void, Void, Void> {
        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            // Create a progressdialog
            mProgressDialog = new ProgressDialog(getActivity());
            // Set progressdialog title
            mProgressDialog.setTitle("Looking for Chapters");
            // Set progressdialog message
            mProgressDialog.setMessage("Loading...");
            mProgressDialog.setIndeterminate(false);
            // Show progressdialog
            mProgressDialog.show();
        }

        @Override
        protected Void doInBackground(Void... params) {
            // Create the array
            grupos = new ArrayList<RowItemChapter>();
            try {

                // Locate the class table named "Chapters"
                ParseQuery<ParseObject> query = new ParseQuery<ParseObject>("Chapters");
                // look only for objects witch column is equal to the ParseObject course.
                query.whereEqualTo("Curso", course);
                // get data in an ascending list
                query.orderByAscending("position");
                // execute the query and get back a list of the data you where looking for
                ob = query.find();
                // make a for inside the list and set the data to the adapter
                for (ParseObject chapter : ob) {
                    // Locate images in flag column
                    RowItemChapter item = new RowItemChapter((String) chapter.get("name"), new SubrowItemChapter(10 , 5, 80), 80);
                    grupos.add(item);
                }
            } catch (ParseException e) {
                Log.e("Error", e.getMessage());
                e.printStackTrace();
            }
            return null;
        }

        @Override
        protected void onPostExecute(Void result) {
            // Locate the listview in the XML 
            listView = (ExpandableListView) getActivity().findViewById(R.id.listaChapters);
            // Pass the results into ListViewAdapter.java
            adapter = new ChaptersAdapter(getActivity(), grupos);
            // Binds the Adapter to the ListView
            listView.setAdapter(adapter);
            // Close the progressdialog
            mProgressDialog.dismiss();
        }
    }

@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        new RemoteDataTask().execute();

    }