我正在处理聊天应用程序。为此我使用Quickblox SDk。到目前为止，我已完成文字聊天。现在我正在尝试在聊天中发送图像。为此，首先我从SD卡中选择图像然后在图像选择上成功上传到quickblox服务器，然后使用QBFile参考我得到图像ID并尝试在聊天窗口中显示它。
这是参考代码。
private void sendChatMessage(String messageText, InputStream imageStream) {
final QBChatMessage chatMessage = new QBChatMessage();
//Send Image
if(imageStream != null){
File file = FileHelper.getFileInputStream(imageStream, "sample_file.png", "myFile");
Boolean fileIsPublic = true;
QBContent.uploadFileTask(file, fileIsPublic, messageText, new QBEntityCallbackImpl<QBFile>() {
@Override
public void onSuccess(QBFile qbFile, Bundle params) {
String publicUrl = qbFile.getPublicUrl();
Toast.makeText(getApplicationContext(), "Image uploaded success", Toast.LENGTH_SHORT).show();
id = qbFile.getId();
Toast.makeText(getApplicationContext(),"Public URl: "+ publicUrl, Toast.LENGTH_SHORT).show();
Toast.makeText(getApplicationContext(),"ID: "+ id + "", Toast.LENGTH_SHORT).show();
//
QBAttachment attach = new QBAttachment("image");
attach.setId(id + "");
ArrayList<QBAttachment> arryattach = new ArrayList<QBAttachment>();
arryattach.add(attach);
chatMessage.setProperty(PROPERTY_SAVE_TO_HISTORY, "1");
chatMessage.setDateSent(new Date().getTime() / 1000);
chatMessage.setBody("");
chatMessage.setAttachments(arryattach);
//chatMessage.setId(id+"");
try {
chat.sendMessage(chatMessage);
} catch (XMPPException e) {
Log.e(TAG, "failed to send a message", e);
} catch (SmackException sme) {
Log.e(TAG, "failed to send a message", sme);
}
if (dialog.getType() == QBDialogType.PRIVATE) {
showMessage(chatMessage);
}
}
@Override
public void onError(List<String> errors) {
System.out.println("==========image uploaded Errors++++++++" + errors.toString());
}
}, new QBProgressCallback(){
@Override
public void onProgressUpdate(int progress){
}
});
}else{
//Send Text Body.
chatMessage.setBody(messageText);
chatMessage.setProperty(PROPERTY_SAVE_TO_HISTORY, "1");
chatMessage.setDateSent(new Date().getTime() / 1000);
try {
chat.sendMessage(chatMessage);
} catch (XMPPException e) {
Log.e(TAG, "failed to send a message", e);
} catch (SmackException sme) {
Log.e(TAG, "failed to send a message", sme);
}
messageEditText.setText("");
if (dialog.getType() == QBDialogType.PRIVATE) {
showMessage(chatMessage);
}
}
}
ChatAdapter.java
的getView（） @Override
public View getView(int position, View convertView, ViewGroup parent) {
final ViewHolder holder;
QBChatMessage chatMessage = getItem(position);
LayoutInflater vi = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
int type = getItemViewType(position) ;
if (convertView == null) {
if (type == ChatItemType.Sticker.ordinal()) {
convertView = vi.inflate(R.layout.list_item_sticker, parent, false);
} else if (type == ChatItemType.Message.ordinal()) {
convertView = vi.inflate(R.layout.list_item_message, parent, false);
} else {
convertView = vi.inflate(R.layout.list_item_image, parent, false);
}
holder = createViewHolder(convertView);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
QBUser currentUser = ChatService.getInstance().getCurrentUser();
boolean isOutgoing = chatMessage.getSenderId() == null || chatMessage.getSenderId().equals(currentUser.getId());
setAlignment(holder, isOutgoing);
Collection<QBAttachment> attachments = chatMessage.getAttachments();
//attachments.
if ( attachments != null && attachments.size() > 0) {
String imageid="" ;
for(QBAttachment attachment :attachments){
imageid = attachment.getId();
}
new BackgroundOperation(holder ,imageid).execute();
} else if (StickersManager.isSticker(chatMessage.getBody())) {
StickersManager.with(convertView.getContext())
.loadSticker(chatMessage.getBody())
.setPlaceholderColorFilterRes(android.R.color.darker_gray)
.into(holder.stickerView);
} else if (holder.txtMessage != null) {
holder.txtMessage.setText(chatMessage.getBody());
}
if (chatMessage.getSenderId() != null) {
holder.txtInfo.setText(chatMessage.getSenderId() + ": " + getTimeText(chatMessage));
} else {
holder.txtInfo.setText(getTimeText(chatMessage));
}
return convertView;
}
class BackgroundOperation extends AsyncTask<InputStream , Void , InputStream>{
ViewHolder holder ;
int imageid ;
InputStream inputStream;
BackgroundOperation(ViewHolder holder , String imageid){
this.holder = holder ;
this.imageid = Integer.parseInt(imageid);
}
@Override
protected void onPreExecute() {
super.onPreExecute();
}
@Override
protected InputStream doInBackground(InputStream... params) {
Handler mHandler = new Handler(Looper.getMainLooper());
mHandler.post(new Runnable() {
public void run() {
QBContent.downloadFileTask(imageid, new QBEntityCallbackImpl<InputStream>() {
@Override
public void onSuccess(InputStream inputS, Bundle params) {
inputStream = inputS ;
//ImageView img = holder.image_attachment ; //.setImageDrawable(d);
//Toast.makeText(context, "Image download Sucess", Toast.LENGTH_SHORT).show();
}
@Override
public void onError(List<String> errors) {
Log.d("Image Download Error : ", errors.toString());
//Toast.makeText(context, "Image Download Error ", Toast.LENGTH_SHORT).show();
}
}, new QBProgressCallback() {
@Override
public void onProgressUpdate(int progress) {
//Toast.makeText(context, "Image Download Progress ", Toast.LENGTH_SHORT).show();
}
});
}
});
return inputStream;
}
@Override
protected void onPostExecute(InputStream s) {
super.onPostExecute(s);
if(s != null){
Log.d("InputStream Value :", "******"+s.toString()+"******************");
Bitmap bmp = BitmapFactory.decodeStream(s);
Drawable d = new BitmapDrawable(context.getResources(), bmp);
if(holder.image_attachment != null)
holder.image_attachment.setImageDrawable(d);
}
}
}
这里我在getView（）中调用新的BackgroundOperation（holder，imageid）.execute（）; ，这里我传递当前holder和imageid从quickblox服务器下载图像。这里发生了什么，当新的BackgroundOperation（holder，imageid）.execute（）运行时（图片上传后），doInBackground（）的return语句不会执行，即使图像正在下载而我我在 QBContent.downloadFileTask（）的onSuccess（）中得到相应的InputStream。我很困惑，为什么doInBackground（）没有返回。
答案 0 :(得分：0)
试试这段代码：
在sendChatMessage内部
替换
id = qbFile.getId();
使用
id = qbFile.getUid();
ChatAdapter.java的getView（）内部
替换
new BackgroundOperation(holder ,imageid).execute();
使用
String url =prefixofimagePublicurl +imageid ;
Picasso.with(context).load(url).into(imageView);
从ChatAdapter.java中删除BackgroundOperation。
注意：将imageid的数据类型更改为String