编辑：已解决，向下滚动；）
按照这里的教程，
我在 AsyncTask 中实现了一个进度条对话框来显示上传数据的百分比。目前它只是从 0% 显示到 100%，然后它会卡在 100% 直到所有数据上传。我正在尝试上传一个 Json 字符串和 4 张图片。
代码：
private class UploaderTask extends AsyncTask<JSONArray, Integer, String> {
private ProgressDialog dialog;
protected Context mContext;
long totalSize;
public UploaderTask(Context context) {
mContext = context;
}
@Override
protected void onPreExecute() {
dialog = new ProgressDialog(mContext);
dialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
dialog.setTitle("Uploading data");
dialog.setCancelable(false);
//dialog.setIndeterminate(true);
dialog.setMessage("Please wait...");
dialog.show();
//dialog.setProgress(0);
}
@Override
public String doInBackground(JSONArray... json) {
String responseMessage = "";
int counter = 0;
try {
CustomMultiPartEntity entity = new CustomMultiPartEntity(new ProgressListener() {
@Override
public void transferred(long num) {
publishProgress((int) ((num / (float) totalSize) * 100));
}
});
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(URL);
//convert JSON array to String (first element contains the whole of data)
String json_encoded_string = json[0].toString();
//add json data
entity.addPart("json", new StringBody(json_encoded_string));
//get all images plus data and add them to the Multipart Entity
for (images_cursor.moveToFirst(); !images_cursor.isAfterLast(); images_cursor.moveToNext()) {
counter++;
//Get image and convert to byte array
byte[] image_ba = images_cursor.getBlob(images_cursor.getColumnIndex("image"));
long image_unit_id = images_cursor.getLong(images_cursor.getColumnIndex("unit_id"));
String image_caption = images_cursor.getString(images_cursor.getColumnIndex("caption"));
//add image to multipart
entity.addPart("image" + counter, new ByteArrayBody(image_ba, "image" + counter + ".jpg"));
//add unit _id to multipart
entity.addPart("image_unit_id" + counter, new StringBody(String.valueOf(image_unit_id)));
//add caption to multipart
entity.addPart("image_caption" + counter, new StringBody(String.valueOf(image_caption)));
}
totalSize = entity.getContentLength();
httppost.setEntity(entity);
HttpResponse response = httpclient.execute(httppost);
InputStream inputStream = response.getEntity().getContent();
responseMessage = inputStreamToString(inputStream);
//log out response from server
longInfo(responseMessage);
}
//show error if connection not working
catch (SocketTimeoutException e) {
e.printStackTrace();
responseMessage = "unreachable";
}
catch (ConnectTimeoutException e) {
e.printStackTrace();
responseMessage = "unreachable";
}
catch (Exception e) {
e.printStackTrace();
responseMessage = "unreachable";
}
return responseMessage;
}
@Override
protected void onProgressUpdate(Integer... progress) {
dialog.setProgress((int) (progress[0]));
}
@Override
protected void onPostExecute(String result) {
//result is the response back from "doInBackground"
dialog.cancel();
TextView response_holder = (TextView) findViewById(R.id.response);
//check if there were errors upoloading
if (result.equalsIgnoreCase("unreachable")) {
response_holder.setText("Error while uploading...Please check your internet connection and retry.");
return;
}
if (result.equalsIgnoreCase("error saving project data")) {
response_holder.setText("There was an error on the server saving the project data, please retry.");
return;
}
if (result.equalsIgnoreCase("error saving sites data")) {
response_holder.setText("There was an error on the server saving the sites data, please retry.");
return;
}
if (result.equalsIgnoreCase("project saved")) {
response_holder.setText("Data uploaded successfully!");
return;
}
if (result.equalsIgnoreCase("project already exist")) {
response_holder.setText("This project already exist!");
return;
}
}
}
我猜它只是计算 json 字符串的总大小，因为它是第一部分......有什么建议吗？
编辑：可能重复，这里仍然没有解决方案
编辑：解决了totalSize = entity.getContentLength();在发布实体之前添加，代码已更新