ListView 中的Android不同行

Question

我有一个新闻应用程序，可以从 Web 下载数据并将其显示在 ListView 中，但是我怎样才能使第一行不同、高度更大、布局不同等等？

这是主要 Activity 来源

public class Home extends Activity {
    // All static variables
    static final String URL = "http://dmb.site50.net/application.php?app_access_key=c4ca4238a0b923820dcc509a6f75849b";
    // XML node keys
    static final String KEY_SONG = "song"; // parent node
    static final String KEY_ID = "id";
    static final String KEY_TITLE = "title";
    static final String KEY_ARTIST = "artist";
    static final String KEY_DURATION = "duration";
    static final String KEY_THUMB_URL = "thumb_url";

    public static final String TAG_NEWS = "news";
    public static final String TAG_ID = "id";
    public static final String TAG_TITLE = "title";
    public static final String TAG_STORY = "story";
    public static final String TAG_SH_STORY = "shorten";
    public static final String TAG_DATETIME = "datetime";
    public static final String TAG_AUTHOR = "author";
    public static final String TAG_IMG = "img";

    ListView list;
    LazyAdapter adapter;
    Button mBtnNaslovnica;
    private ViewSwitcher viewSwitcher;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
        setContentView(R.layout.main);

        mBtnNaslovnica = (Button) findViewById(R.id.mBtnNaslovnica);
        mBtnNaslovnica.setSelected(true);
        TextView txtView=(TextView) findViewById(R.id.scroller);
    txtView.setSelected(true);

        ImageButton mBtnRefresh = (ImageButton) findViewById(R.id.btnRefresh);
        mBtnRefresh.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                new LoadingTask().execute(URL);
            }
        });


            ArrayList<HashMap<String, String>> homeList = new ArrayList<HashMap<String, String>>();



                JSONObject jsonobj;
                try {
                    jsonobj = new JSONObject(getIntent().getStringExtra("json"));
                    JSONArray news = jsonobj.getJSONArray(TAG_NEWS);
                    for(int i = 0; i < news.length(); i++){
                        JSONObject c = news.getJSONObject(i);

                        // Storing each json item in variable
                        String id = c.getString(TAG_ID);
                        String title = c.getString(TAG_TITLE);
                        String story = c.getString(TAG_STORY);
                        String shorten = c.getString(TAG_SH_STORY);
                        String author = c.getString(TAG_AUTHOR);
                        String datetime = c.getString(TAG_DATETIME);
                        String img = c.getString(TAG_IMG);


                        // creating new HashMap
                        HashMap<String, String> map = new HashMap<String, String>();

                        // adding each child node to HashMap key => value
                        map.put(TAG_ID, id);
                        map.put(TAG_TITLE, title);
                        map.put(TAG_STORY, story);
                        map.put(TAG_IMG, img);
                        map.put(TAG_DATETIME, datetime);
                        map.put(TAG_AUTHOR, author);

                        // adding HashList to ArrayList
                        homeList.add(map);}
                } catch (JSONException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }






            list=(ListView)findViewById(R.id.list);

            // Getting adapter by passing xml data ArrayList
            adapter=new LazyAdapter(this, homeList);        
            list.setAdapter(adapter);


            // Click event for single list row
            list.setOnItemClickListener(new OnItemClickListener() {

                @Override
                public void onItemClick(AdapterView<?> parent, View view,int position, long id) {
                    String cur_title = ((TextView) view.findViewById(R.id.title)).getText().toString();
                    String cur_story = ((TextView) view.findViewById(R.id.einfo2)).getText().toString();
                    String cur_author = ((TextView) view.findViewById(R.id.einfo1)).getText().toString();
                    String cur_datetime  = ((TextView) view.findViewById(R.id.einfo)).getText().toString();
                    ImageView cur_img = (ImageView) view.findViewById(R.id.list_image);
                    String cur_img_url = (String) cur_img.getTag();

                    Intent i = new Intent("com.example.androidhive.CURENTNEWS");
                    i.putExtra("CUR_TITLE", cur_title);
                    i.putExtra("CUR_STORY", cur_story);
                    i.putExtra("CUR_AUTHOR", cur_author);
                    i.putExtra("CUR_DATETIME", cur_datetime);
                    i.putExtra("CUR_IMG_URL", cur_img_url);
                    startActivity(i);
                }
            });     
        }   

    public void loadPage(){

    }

    public void startNewActivity(){

    }
    public class LoadingTask extends AsyncTask<String, Object, Object>{
        XMLParser parser = new XMLParser();
        JSONParser jParser = new JSONParser();
        @Override
        protected Object doInBackground(String... params) {
            // TODO Auto-generated method stub
            String URL = params[0];
            JSONObject json = jParser.getJSONFromUrl(URL);
            //String xml = parser.getXmlFromUrl(URL); // getting XML from URL
             // getting DOM element
            return json;
        }

        protected void onPostExecute(Object result){
            Intent startApp = new Intent("com.example.androidhive.HOME");
            startApp.putExtra("json", result.toString());
            startActivity(startApp);
        }


    }



    }

Answer 1

您需要修改您的 LazyAdapter 代码以根据您想要的任何标准为每一行返回正确的布局。 ListView 只是使用适配器提供的 View ，因此每一行的布局都不同并没有什么特别之处。请注意，要使其正常工作，您还需要实现 getItemViewType() 和 getViewTypeCount()。