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我ListView用图像和文字做了一个。我能够解析ListView 中的json 数据。但我的要求是加载 10 行 Json 数据，然后在底部再加载。获得下一个 10 等。如果有人知道使用 json 的解决方案，请建议我...

  • 这是我的Adapter.java代码

    public class LazyAdapter extends BaseAdapter {

    private Activity activity;
    private ArrayList<HashMap<String, String>> data;
    private static LayoutInflater inflater=null;
    public ImageLoader imageLoader;

    public LazyAdapter(Activity a, ArrayList<HashMap<String, String>> d) {
        activity = a;
        data=d;
        inflater = (LayoutInflater)activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        imageLoader=new ImageLoader(activity.getApplicationContext());
    }

    public int getCount() {
        return data.size();
    }

    public Object getItem(int position) {
        return position;
    }

    public long getItemId(int position) {
        return position;
    }

    public View getView(int position, View convertView, ViewGroup parent) {
        View vi=convertView;
        if(convertView==null)
            vi = inflater.inflate(R.layout.list_row, null);

        TextView title = (TextView)vi.findViewById(R.id.title); // title
        TextView artist = (TextView)vi.findViewById(R.id.artist); // artist name
        TextView duration = (TextView)vi.findViewById(R.id.duration); // duration
        ImageView thumb_image=(ImageView)vi.findViewById(R.id.list_image);
        ImageView thumb_image1=(ImageView)vi.findViewById(R.id.imageView1);// thumb image

        HashMap<String, String> song = new HashMap<String, String>();
        song = data.get(position);

        // Setting all values in listview
        title.setText(song.get(CustomizedListView.USER_NAME));
        artist.setText(song.get(CustomizedListView.KEY_ARTIST));
        duration.setText(song.get(CustomizedListView.KEY_DURATION));
        imageLoader.DisplayImage(song.get(CustomizedListView.KEY_THUMB_URL), thumb_image);

        imageLoader.DisplayImage(song.get(CustomizedListView.KEY_THUMB_URL1), thumb_image1);
        return vi;
    }
}

  • 这是MainActivity.java的代码

    public class CustomizedListView extends Activity {
    // All static variables
    static final String URL = XXXX.json;
    //private static String URL;
    // XML node keys
    static final String KEY_SONG = "review_full"; // parent node
    static final String KEY_ID = "activity_id";
    static final String USER_NAME = "user_name";
    static final String KEY_ARTIST = "review_small";
    static final String KEY_DURATION = "time";
    static final String KEY_THUMB_URL = "thumb";
    static final String KEY_THUMB_URL1 = "photo";
    String type;
    String user_name1;
    String thumbnail;
    String subscriber_name;
    String review_full;
    String status;
    String photo;
    ListView list;
    String review_small;
    LazyAdapter adapter;


    String[] image;
    ArrayList<HashMap<String, String>> songsList;
    public  String image1=null;

    @Override
    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        //Intent intent1 = getIntent();
        //String easyPuzzle = intent1.getExtras().getString("Id");  
        //URL=URL0+easyPuzzle;
        songsList = new ArrayList<HashMap<String, String>>();
        JSONParser jParser = new JSONParser();
        JSONObject json = jParser.getJSONFromUrl(URL);


        try{
            Log.d("Parsing JSON Data", "Before json1 try2");
            JSONArray activities = json.getJSONArray("activities");
            Log.d("Parsing JSON Data", "after activiti");

            for (int i = 0; i < activities.length(); i++) {
                JSONObject c = activities.getJSONObject(i);
                image=new String[2];
                Log.d("Parsing JSON Data", "inside for loop");
                HashMap<String, String> map = new HashMap<String, String>();

                //checking type content
                type=c.getString("type");

                if(type.contains("user")){
                    user_name1=c.getString( USER_NAME);
                    thumbnail=c.getString(KEY_THUMB_URL);
                    map.put(KEY_THUMB_URL,  thumbnail);

                    map.put(USER_NAME, user_name1+" "+"joined etable community");
                    map.put(KEY_DURATION,  c.getString( KEY_DURATION));
                    //  map.put(KEY_ARTIST,null);

                }else if(type.contains("checkin")){
                    user_name1=c.getString( USER_NAME);
                    subscriber_name=c.getString("subscriber_name");
                    thumbnail=c.getString(KEY_THUMB_URL);
                    photo=c.getString("photo");

                    if(photo.contains("False")){
                        image1="False";
                        map.put(KEY_THUMB_URL1, image1);
                    }else{

                        image = photo.split("image=");
                        image1=image[1];
                        map.put(KEY_THUMB_URL1, image1);

                    }

                    map.put(KEY_THUMB_URL,  thumbnail);
                    map.put(USER_NAME, user_name1+" "+"was spotted at"+" "+subscriber_name);
                    map.put(KEY_DURATION,  c.getString( KEY_DURATION));
                    //  map.put(KEY_ARTIST,null);

                }else if(type.contains("favorite")){
                    subscriber_name=c.getString("subscriber_name");
                    user_name1=c.getString( USER_NAME);
                    thumbnail=c.getString(KEY_THUMB_URL);

                    map.put(KEY_THUMB_URL,  thumbnail);
                    map.put(USER_NAME, user_name1+" "+"favorited"+" "+subscriber_name);
                    map.put(KEY_DURATION,  c.getString( KEY_DURATION));
                    //map.put(KEY_ARTIST,null);

                }else if(type.contains("review")){
                    subscriber_name=c.getString("subscriber_name");
                    user_name1=c.getString( USER_NAME);
                    review_small=c.getString("review_small");
                    review_full=c.getString("review_full");

                    thumbnail=c.getString(KEY_THUMB_URL);
                    map.put(KEY_THUMB_URL,  thumbnail);
                    map.put(USER_NAME, user_name1+" "+"wrote a review for"+" "+subscriber_name);
                    map.put(KEY_DURATION,  c.getString( KEY_DURATION));
                    map.put(KEY_ARTIST,review_small);
                    map.put(KEY_SONG,review_full);

                }else if(type.contains("status")){
                    user_name1=c.getString( USER_NAME);
                    status=c.getString("full_status");

                    thumbnail=c.getString(KEY_THUMB_URL);
                    map.put(KEY_THUMB_URL,  thumbnail);
                    map.put(USER_NAME, user_name1+" "+"says\n"+" "+status);
                    map.put(KEY_DURATION,  c.getString( KEY_DURATION));
                    //map.put(KEY_ARTIST,null);

                }else{
                    user_name1=c.getString( USER_NAME);
                    map.put(USER_NAME, user_name1+" "+"some problem");
                    //map.put(KEY_ARTIST,null);
                }

                // adding HashList to ArrayList
                songsList.add(map);

            }}catch (JSONException e) {
            e.printStackTrace();
        }

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

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

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

            @Override
            public void onItemClick(AdapterView<?> parent, View view,
                                    int position, long id) {
                list.invalidateViews();
                Log.d("Parsing JSON Data", "start click");
                HashMap<String, String> map = songsList.get(position);

                Intent in = new Intent(CustomizedListView.this, LargeView.class);
                in.putExtra("text", map.get(USER_NAME));
                in.putExtra("image", map.get(KEY_THUMB_URL));
                in.putExtra("review", map.get(KEY_SONG));

                Log.d("Parsing JSON Data", "inside profile33");

                startActivity(in);
                Log.d("Parsing JSON Data", USER_NAME);

            }
        });
    }

}
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1 回答 1

2

设置您的 adapter.setNotifysetchanged() 将在您的 ListView 中显示添加的项目 这里我给您一些示例，说明如何将负载更多地与您的 ListView 集成

1.例子

2.Costum 加载更多列表视图

于 2013-05-23T04:38:57.333 回答