用JSON填充的ListView替换JSON填充的TextView
我有一个JSON请求，它返回来自youtube的响应，其中包含特定video的评论。 我目前有3个文本视图：一个用于名称/上传者，一个用于内容，一个用于发布日期 – 然后填充来自我的JSON响应的数据。
我的问题是 – 只显示第一条评论，发布日期和上传者。
我相信我需要用列表视图替换我的textviews并解析3个字段 – 我根本不知道如何。
JAVA
公共类播放器扩展YouTubeBaseActivity实现了YouTubePlayer.OnInitializedListener {
public static final String API_KEY = "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.player); String title = getIntent().getStringExtra("title"); String uploader = getIntent().getStringExtra("uploader"); String viewCount = getIntent().getStringExtra("viewCount"); TextView titleTv = (TextView) findViewById(R.id.titleTv); TextView uploaderTv = (TextView) findViewById(R.id.uploaderTv); TextView viewCountTv = (TextView) findViewById(R.id.viewCountTv); titleTv.setText(title); uploaderTv.setText("by" + uploader + " |"); viewCountTv.setText(viewCount + " views"); YouTubePlayerView youTubePlayerView = (YouTubePlayerView) findViewById(R.id.youtubeplayerview); youTubePlayerView.initialize(API_KEY, this); Handler handler = new Handler(new Handler.Callback() { @Override public boolean handleMessage(Message msg) { return false; } }); GetYouTubeUserCommentsTask task = new GetYouTubeUserCommentsTask(handler , viewCount); task.execute(); } @Override public void onInitializationFailure(Provider provider, YouTubeInitializationResult result) { Toast.makeText(getApplicationContext(), "onInitializationFailure()", Toast.LENGTH_LONG).show(); } @Override public void onInitializationSuccess(Provider provider, YouTubePlayer player, boolean wasRestored) { if (!wasRestored) { String video_id = getIntent().getStringExtra("id"); player.loadVideo(video_id); } } public final class GetYouTubeUserCommentsTask extends AsyncTask { public static final String LIBRARY = "CommentsLibrary"; private final Handler replyTo; private final String username; String video_id = getIntent().getStringExtra("id"); public GetYouTubeUserCommentsTask(Handler replyTo, String username) { this.replyTo = replyTo; this.username = username; } @Override protected Void doInBackground(Void... arg0) { try { HttpClient client = new DefaultHttpClient(); HttpUriRequest request = new HttpGet( "http://gdata.youtube.com/feeds/api/videos/" + video_id + "/comments?v=2&alt=json&start-index=1&max-results=50&prettyprint=true"); HttpResponse response = client.execute(request); String jsonString = StreamUtils.convertToString(response .getEntity().getContent()); JSONObject json = new JSONObject(jsonString); JSONArray jsonArray = json.getJSONObject("feed").getJSONArray( "entry"); List comments = new ArrayList(); for (int i = 0; i < jsonArray.length(); i++) { JSONObject entry = jsonArray.getJSONObject(i); JSONArray authorArray = entry.getJSONArray("author"); JSONObject publishedObject = entry.getJSONObject("published"); String published = publishedObject.getString("$t"); JSONObject contentObject = entry.getJSONObject("content"); String content = contentObject.getString("$t"); JSONObject authorObject = authorArray.getJSONObject(0); JSONObject nameObject = authorObject.getJSONObject("name"); String name = nameObject.getString("$t"); comments.add(new Comments(name, content, published)); CommentsLibrary lib = new CommentsLibrary(published, content, name); Bundle data = new Bundle(); data.putSerializable(LIBRARY, lib); Message msg = Message.obtain(); msg.setData(data); replyTo.sendMessage(msg); } } catch (ClientProtocolException e) { Log.e("Feck", e); } catch (IOException e) { Log.e("Feck", e); } catch (JSONException e) { Log.e("Feck", e); } return null; } @Override protected void onPostExecute(Void result) { ListView comments = (ListView) findViewById(R.id.comments); comments.setFilterText(com.idg.omv.domain.CommentsLibrary.getName()); } } }
CommentsLibrary
public class CommentsLibrary implements Serializable{ // The username of the owner of the comment private static String name; // The comment private static String content; // The date the comment was published private static String published; public CommentsLibrary(String name, String content, String published) { this.name = name; this.content = content; this.published = published; } /** * @return the user name */ public static String getName() { return name; } /** * @return the videos */ public static String getContent() { return content; } /** * @return the videos */ public static String getPublished() { return published; } }
XML
从我之前的问题继续我的回答@JSON String错误地映射到textviews
首先，您需要在布局xml中使用listview
将列表声明为实例变量
ArrayList list = new ArrayList ();
然后
for (int i = 0; i < jsonArray.length(); i++) { JSONObject jsonObject = jsonArray.getJSONObject(i); String name = jsonObject.optString("name","defaultValue"); String content = jsonObject.optString("content","defaultValue"); String published = jsonObject.optString("published","defaultValue"); list.add(new CommentsLibrary(name, content, published)); }
然后初始化listview
ListView lv =(ListView)findViewById(R.id.list); CustomAdapter cus = new CustomAdapter(ActivityName.this,list); lv.setAdapter(cus);
使用3个textviews定义自定义布局。 （list_item.xml）
然后通过扩展基本适配器来定义自定义适配器。 覆盖getView自定义布局并在那里设置文本视图。
public class CustomAdapter extends BaseAdapter { LayoutInfalter mInflater; ArrayList list; public CustomAdapter(Context context,ArrayList list) { mInflater = LayoutInfalter.from(context); this.list = list; } @Override public int getCount() { // TODO Auto-generated method stub return list.size(); } @Override public Object getItem(int position) { // TODO Auto-generated method stub return position; } @Override public long getItemId(int position) { // TODO Auto-generated method stub return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { // TODO Auto-generated method stub ViewHolder holder; if(convertView==null) { convertView =minflater.inflate(R.layout.list_item, parent,false); holder = new ViewHolder(); holder.tv1 = (TextView) convertView.findViewById(R.id.textView1); holder.tv2 = (TextView) convertView.findViewById(R.id.textView2); holder.tv3 = (TextView) convertView.findViewById(R.id.textView3); convertView.setTag(holder); } else { holder= (ViewHolder) convertView.getTag(); } holder.tv1.setText(list.get(position).getName()); holder.tv2.setText(list.get(position).getContent()); holder.tv3.setText(list.get(position).getPublished()); return convertView; } static class ViewHolder { TextView tv1,tv2,tv3 } }
您需要在布局中添加列表视图并使用ArrayAdapter填充它。 这是一个教程，向您展示如何 – http://www.vogella.com/articles/AndroidListView/article.html#arrayAdapter