雖然位圖似乎是正確的,但變量’userBitmap’將保持為null.但是,當我在平板電腦上向上或向下滾動時,新的列表行將包含圖片,但它們都是相同和錯誤的.真的,真的很困惑.我嘗試了許多不同的方法從網上獲取圖像.任何幫助是極大的贊賞.

我的定制適配器：

public class MessagesArrayAdapter extends ArrayAdapter

{

Bitmap userBitmap;

public MessageArrayAdapter(Context context, List objects)

{

super(context, 0, objects);

}

public View getView(int position, View convertView, ViewGroup parent)

{

ChatCell chatCell = new ChatCell();

LayoutInflater inflater = LayoutInflater.from(getContext());

convertView = inflater.inflate(R.layout.cell_chat, parent, false);

chatCell.usernameTextView = (TextView) convertView.findViewById(R.id.usernameTextView);

chatCell.messageTextView = (TextView) convertView.findViewById(R.id.messageTextView);

chatCell.userImageView = (ImageView) convertView.findViewById(R.id.userImageView);

ChatData chatData = getItem(position);

// Get user image from web

new loadImageAsync().execute(chatData.avatarURL);

chatCell.userImageView.setImageBitmap(userBitmap);

chatCell.usernameTextView.setText(chatData.username);

chatCell.messageTextView.setText(chatData.message);

return convertView;

}

private static class ChatCell

{

TextView usernameTextView;

TextView messageTextView;

ImageView userImageView;

}

private class loadImageAsync extends AsyncTask{

@Override

protected Double doInBackground(String... params) {

userBitmap = loadImage(params[0]);

return null;

}

}

public Bitmap loadImage(String str) {

InputStream instream = null;

try {

HttpGet httpRequest = new HttpGet(URI.create(str));

HttpClient httpclient = new DefaultHttpClient();

HttpResponse response = (HttpResponse) httpclient.execute(httpRequest);

HttpEntity entity = response.getEntity();

BufferedHttpEntity bufHttpEntity = new BufferedHttpEntity(entity);

instream = bufHttpEntity.getContent();

Bitmap myBitmap = BitmapFactory.decodeStream(instream);

return myBitmap;

} catch (Exception e) {

e.printStackTrace();

return null;

} finally {

//close input

if (instream != null) {

try {

instream.close();

} catch (IOException ioex) {

// Handle error

}

}

}

}

}

與50位技術專家面對面20年技術見證，附贈技術全景圖

總結

以上是生活随笔為你收集整理的android studio常用适配器,从ListView(Android Studio)的自定义适配器中的U...的全部內容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網站內容還不錯，歡迎將生活随笔推薦給好友。