Android將viewImage設置爲ListView

我需要在我的ListView中設置ImageView。我從網上下載圖像到我的列表。爲此，我試圖擴展BaseAdapter並覆蓋方法。我正在使用UrlImageViewHelper。所以我找到了麻煩。有時候我應該展示一個形象，有時候不會。但我的列表單元格總是顯示一個圖像。Android將viewImage設置爲ListView

class MySimpleAdapter extends BaseAdapter { 


    ArrayList<WallMessage> posts; 
    HashMap<Long, User> distinctUsers; 
    Activity activity; 
    WallMessage post; 
    User user; 
    LayoutInflater inflater=null; 

    public MySimpleAdapter(Activity a, ArrayList<WallMessage> posts, HashMap<Long, User> distinctUsers) { 
     this.activity = a; 
     this.distinctUsers = distinctUsers; 
     this.posts = posts; 
     for(int i = 0; i < posts.size(); i++) { 
      Log.d("myLogs", "attachSize = " + posts.get(i).attachments.size()); 
     } 
     inflater = (LayoutInflater) activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
    } 

    @Override 
    public int getCount() { 
     return posts.size(); 
    } 

    @Override 
    public Object getItem(int position) { 
     return posts.get(position); 
    } 

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

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

     TextView authorTv = (TextView) vi.findViewById(R.id.author); 
     TextView postTv = (TextView) vi.findViewById(R.id.post); 
     TextView dateTv = (TextView) vi.findViewById(R.id.date); 
     TextView likesTv = (TextView) vi.findViewById(R.id.likes); 
     ImageView imagePhoto =(ImageView) vi.findViewById(R.id.imagePhoto); 
     ImageView imagePost = (ImageView) vi.findViewById(R.id.imagePost); 

     post = posts.get(position); 
     user = distinctUsers.get(post.from_id); 
     authorTv.setText(user.first_name + " " + user.last_name); 
     postTv.setText(post.text); 
     dateTv.setText(parseDate(post.date)); 
     likesTv.setText(Long.toString(post.like_count)); 
     UrlImageViewHelper.setUrlDrawable(imagePhoto, user.photo); 

     if(post.attachments != null && post.attachments.size() != 0) { 
      UrlImageViewHelper.setUrlDrawable(imagePost, post.attachments.get(0).photo.src); 
     } 
     return vi; 
    } 
}

我知道我有來自其他細胞加載post.attachments.size（）== 0 但我的列表中的所有同一節目的圖像元素。

來源

2013-11-24 Anatol

的Android適配器將重用的意見，你檢查，你清除imagePhoto＆imagePost（通過調用ImageView.setImageBitmap（空）或類似的東西）的情況下，當沒有任何圖像？ – panini

謝謝，imagePost.setImageBitmap（null）正常工作。 – Anatol

當您使用covertView時，您可以在重複使用的視圖中獲取先前存儲的值。嘗試：

UrlImageViewHelper.setUrlDrawable(imagePhoto, user.photo); 

    if (post.attachments != null && post.attachments.size() != 0) { 
     UrlImageViewHelper.setUrlDrawable(imagePost, post.attachments.get(0).photo.src); 
    } else { 
     imagePost.setVisibility(View.INVISIBLE); 
     // above can be any default url using UrlImageViewHelper 
     // or just some local resource like 
     // imagePost.setImageResource(R.drawable.some_default_drawable_resource); 
    }

來源

2013-11-24 20:19:08 fada21

我在您的代碼中進行了替換。 imagePost.setVisibility（View.INVISIBLE）; ---> imagePost.setImageBitmap（null）; 現在它工作正常。 – Anatol

Android將viewImage設置爲ListView

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