如何在一个 Activity 中显示 listview 和 webview？

Posted 2023-04-19

【中文标题】如何在一个 Activity 中显示 listview 和 webview？

【英文标题】：How to display a listview and a webview in one Activity?

【发布时间】：2016-08-30 02:51:36

【问题描述】：

所以我试图在一个 Activity 中实现两个 API，并在同一个 Activity 中为我的第二个 API 显示 listview 和 webview。我设法让列表视图下来。这是我尝试调用的 MainActivity 的一部分，通过 onClick 方法运行两个 API

    @Override
protected void onCreate(Bundle savedInstanceState) 
    super.onCreate(savedInstanceState);
    setContentView(R.layout.twit_list);
    activity = this;

    Key = getStringFromManifest("CONSUMER_KEY");
    Secret = getStringFromManifest("CONSUMER_SECRET");

    txtSearch = (EditText) findViewById(R.id.txtSearch);
    searchbtn = (Button) findViewById(R.id.searchbtn);
    save = (Button) findViewById(R.id.save);
    savedSearches = (Button)findViewById(R.id.savedSearches);

    searchbtn.setOnClickListener(new View.OnClickListener()
        @Override
    public void onClick(View view)

            downloadSearches();
            new GoogleSearch();


        
    );
    save.setOnClickListener(new Button.OnClickListener() 
        @Override
        public void onClick(View v) 
            saveSearch();

        
    );

    savedSearches.setOnClickListener(new Button.OnClickListener()
        @Override
    public void onClick(View v)
            openSavedSearches();
        
    );

这是 GoogleSearch API public void onCreate(Bundle savedInstanceState) super.onCreate(savedInstanceState); setContentView(R.layout.twit_list);

    txtSearch = (EditText)webView.findViewById(R.id.txtSearch);
    searchbtn = (Button) webView.findViewById(R.id.searchbtn);
    webView = (WebView)webView.findViewById(R.id.webView);

    searchbtn.setOnClickListener(new View.OnClickListener() 
        @Override
        public void onClick(View v) 
            String item = txtSearch.getText().toString();
            new JsonSearchTask(item).execute();
        
    );


    private class JsonSearchTask extends AsyncTask<Void, Void, Void> 

        String searchResult = "";
        String search_url =   "http://ajax.googleapis.com/ajax/services/search/web?v=1.0&q=";
        String search_query;

        JsonSearchTask(String item)

            try 
                search_item = URLEncoder.encode(item, "utf-8");
             catch (UnsupportedEncodingException e) 
                // TODO Auto-generated catch block
                e.printStackTrace();
            

            search_query = search_url + search_item;
        

        @Override
        protected Void doInBackground(Void... arg0) 

            try 
                searchResult = ParseResult(sendQuery(search_query));
             catch (JSONException e) 
                // TODO Auto-generated catch block
                e.printStackTrace();
             catch (IOException e) 
                // TODO Auto-generated catch block
                e.printStackTrace();
            

            return null;
        

        @Override
        protected void onPreExecute() 

            searchbtn.setEnabled(false);
            searchbtn.setText("Wait...");
            super.onPreExecute();
        

        @Override
        protected void onPostExecute(Void result) 

            webView.loadData(searchResult,
                    "text/html",
                    "UTF-8");

            searchbtn.setEnabled(true);
            searchbtn.setText("Search");

            super.onPostExecute(result);
        

    

private String sendQuery(String query) throws IOException
    String result = "";

    URL searchURL = new URL(query);

    HttpURLConnection httpURLConnection = (HttpURLConnection) searchURL.openConnection();

    if(httpURLConnection.getResponseCode() == HttpURLConnection.HTTP_OK)
        InputStreamReader inputStreamReader = new InputStreamReader(httpURLConnection.getInputStream());
        BufferedReader bufferedReader = new BufferedReader(
                inputStreamReader,
                8192);

        String line = null;
        while((line = bufferedReader.readLine()) != null)
            result += line;
        

        bufferedReader.close();
    

    return result;


private String ParseResult(String json) throws JSONException
    String parsedResult = "";

    JSONObject jsonObject = new JSONObject(json);
    JSONObject jsonObject_responseData = jsonObject.getJSONObject("responseData");
    JSONArray jsonArray_results = jsonObject_responseData.getJSONArray("results");

    //parsedResult += "Google Search APIs (JSON) for : <b>" + search_item + "</b><br/>";
    //parsedResult += "Number of results returned = <b>" + jsonArray_results.length() + "</b><br/><br/>";

    for(int i = 0; i < jsonArray_results.length(); i++)

        JSONObject jsonObject_i = jsonArray_results.getJSONObject(i);

        String iTitle = jsonObject_i.getString("title");
        String iContent = jsonObject_i.getString("content");
        String iUrl = jsonObject_i.getString("url");

        parsedResult += "<a href='" + iUrl + "'>" + iTitle + "</a><br/>";
        parsedResult += iContent + "<br/><br/>";
    

    return parsedResult;

xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_
android:layout_
android:id = "@+id/activitymain"
>




<RelativeLayout
    android:layout_
    android:layout_
    android:orientation="horizontal">
    <EditText
        android:layout_
        android:layout_
        android:id = "@+id/txtSearch"/>
    <Button
        android:layout_
        android:layout_
        android:layout_below="@+id/txtSearch"
        android:text="Search"
        android:id="@+id/searchbtn" />
    <Button
        android:layout_
        android:layout_
        android:layout_below="@+id/txtSearch"
        android:layout_toRightOf="@+id/searchbtn"
        android:layout_toEndOf="@+id/searchbtn"
        android:id="@+id/save"
        android:text="     Save     " />

    <Button
        android:layout_
        android:layout_
        android:text="Saved Searches"
        android:id="@+id/savedSearches"
        android:layout_alignTop="@+id/save"
        android:layout_toRightOf="@+id/save"
        android:layout_toEndOf="@+id/save" />
</RelativeLayout>



<ListView
    android:layout_
    android:layout_
    android:id = "@android:id/list"
    android:background="#FF498CDE">

</ListView>

<WebView
    android:layout_
    android:layout_
    android:id="@+id/webView"
    android:layout_gravity="center_horizontal" />

基本上我想在单击搜索按钮时同时运行这两个 api。 请有人指出我正确的方向，我对此完全陌生。 谢谢

【参考方案1】：

问题是您在 JsonSearchTask AsyncTask 中没有得到任何响应。

问题是您用于谷歌网络搜索的 api 现在不可用。您应该使用 Google 自定义搜索 API (https://developers.google.com/custom-search/)。