如何在httpPost中使用publishProgress？我看到了example with urlOpenConnection，但没有看到HttpPost。是否可以将publishProgress与我的代码stracture一起使用（我希望看到下载状态）？
我的asynctask子类
class SendData extends AsyncTask<String, Void, JSONObject> {
@Override
protected void onPreExecute() {
pd.setTitle("Loading...");
}
@Override
protected JSONObject doInBackground(String... option) {
JSONObject json = null;
UserFunctions u = new UserFunctions();
json = u.sendAdd(option);
return json;
}
@Override
protected void onPostExecute(JSONObject result) {
super.onPostExecute(result);
*/
do some job
/*
}
}
我的json解析器
public JSONArray getJSONFromUrl(String url, List<NameValuePair> params,
int check) {
HttpResponse httpResponse = null;
InputStream is = null;
JSONArray jObj1 = null;
String json = "";
HttpClient httpClient = null;
if (isOnline()) {
// pd.show();
// // Making HTTP request
String u = url;
u = u + "?";
try {
// defaultHttpClient
httpClient = UILApplication.getHttpClient();
HttpPost httpPost = new HttpPost(url);
httpPost.setEntity(new UrlEncodedFormEntity(params, HTTP.UTF_8));
for (int i = 0; i < params.size(); i++) {
u = u + params.get(i).getName() + "="
+ params.get(i).getValue() + "&";
}
Log.d("URL", u);
httpResponse = httpClient.execute(httpPost);
List<Cookie> cookies = ((AbstractHttpClient) httpClient)
.getCookieStore().getCookies();
if (cookies.isEmpty()) {
Log.d("COOK", "response - none");
} else {
for (int i = 0; i < cookies.size(); i++) {
Log.d("COOK", "response - " + cookies.get(i).toString());
}
}
HttpEntity httpEntity = httpResponse.getEntity();
is = httpEntity.getContent();
Log.d("data is sent", "true");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
return null;
} catch (ClientProtocolException e) {
e.printStackTrace();
return null;
} catch (IOException e) {
e.printStackTrace();
return null;
}
Log.d("wait", "true");
try {
BufferedReader reader = new BufferedReader(
new InputStreamReader(is, "UTF-8"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
// Log.d("JSON line", line);
sb.append(line + "\n");
}
is.close();
json = sb.toString();
} catch (Exception e) {
Log.e("Buffer Error", "Error converting result " + e.toString());
return null;
}
// try parse the string to a JSON object
try {
jObj1 = new JSONArray(json);
} catch (JSONException e) {
e.printStackTrace();
Log.e("JSON Parser", "Error parsing data " + e.toString());
return null;
}
if (json.contains("error:2")) {
Log.e("JSON", jObj1.toString());
HttpClientFactory.killSession();
UILApplication.login = 2;
return null;
}
if (jObj1 != null) {
Log.d("JSON", jObj1.toString());
}
return jObj1;
}
return null;
}
用户函数 - 为json解析器生成NaValuePair列表。
public JSONObject sendAdd(options) {
// Building Parameters
Log.d("parsing data to sendAdd", "true");
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("action", "add_notice"));
*/
more parameters
*/
}
请不要使用url.openConection给代码示例:)
编辑我的数据库如何获得将用于publishProgress（a）的值a。我知道我可以手动设置它，例如每秒增加，但我希望它代表下载状态。
答案 0 :(得分：1)
使用以下代码显示文件下载进度
1）为进度为0
创建一个开始pt public static final int DIALOG_DOWNLOAD_PROGRESS = 0;
2）创建要在活动上显示的对话框
@Override
protected Dialog onCreateDialog(int id) {
switch (id) {
case DIALOG_DOWNLOAD_PROGRESS:
mProgressDialog = new ProgressDialog(this);
mProgressDialog.setMessage("Downloading file..");
mProgressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
mProgressDialog.setCancelable(false);
mProgressDialog.show();
return mProgressDialog;
default:
return null;
}
}
3）下载asynctask
class DownloadFileAsync extends AsyncTask<String, String, String> {
@SuppressWarnings("deprecation")
@Override
protected void onPreExecute() {
super.onPreExecute();
showDialog(DIALOG_DOWNLOAD_PROGRESS);
}
@Override
protected String doInBackground(String... aurl) {
int count;
File root = android.os.Environment.getExternalStorageDirectory();
//
File dir = new File (root.getAbsolutePath()+"/downlaod"); //name of ur download folder
if(dir.exists()==false) {
dir.mkdirs();
}
File file = new File(dir, filename); //enter ur name of the file
try {
URL url = new URL(aurl[0]);
URLConnection conexion = url.openConnection();
conexion.connect();
int lenghtOfFile = conexion.getContentLength();
Log.d("ANDRO_ASYNC", "Lenght of file: " + lenghtOfFile);
InputStream input = new BufferedInputStream(url.openStream());
OutputStream output = new FileOutputStream(file);
byte data[] = new byte[1024];
long total = 0;
while ((count = input.read(data)) != -1) {
total += count;
publishProgress(""+(int)((total*100)/lenghtOfFile));
output.write(data, 0, count);
}
output.flush();
output.close();
input.close();
} catch (Exception e) {}
return null;
}
protected void onProgressUpdate(String... progress) {
Log.d("ANDRO_ASYNC",progress[0]);
mProgressDialog.setProgress(Integer.parseInt(progress[0]));
}
@SuppressWarnings("deprecation")
@Override
protected void onPostExecute(String unused) {
dismissDialog(DIALOG_DOWNLOAD_PROGRESS);
Toast.makeText(this,"Successfully downloaded in phone memory.", Toast.LENGTH_SHORT).show();
}
}
4）调用异步
new DownloadFileAsync().execute(URL); //pass your url
答案 1 :(得分：0)
请参阅此示例：我使用此代码将照片更新为服务器。
如果您想使用 publishProgress ，请替换 iNotifyProgress.notify（进度）并实施 onProgressUpdate
但是，我建议你用我的方式来更新进度条。
public static class UploadPhoto extends AsyncTask<String, Void, InputStream> {
private static final String TAG = "UploadImage";
byte[] buffer;
byte[] data;
//private long dataLength = 0;
private INotifyProgressBar iNotifyProgressBar;
private int user_id;
private IAddNewItemOnGridView mAddNewItemOnGridView;
public UploadPhoto(INotifyProgressBar iNotifyProgressBar,
IAddNewItemOnGridView mAddNewItemOnGridView, int user_id) {
this.iNotifyProgressBar = iNotifyProgressBar;
this.user_id = user_id;
this.mAddNewItemOnGridView = mAddNewItemOnGridView;
}
@Override
protected InputStream doInBackground(String... names) {
File mFile = null;
FileBody mBody = null;
File dcimDir = null;
try {
String fileName = names[0];
dcimDir = Environment
.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM);
mFile = new File(dcimDir, Def.PHOTO_TEMP_DIR + fileName);
if (!mFile.isFile()) {
iNotifyProgressBar.notify(0, UploadStatus.FAILED);
return null;
}
HttpClient httpClient = new DefaultHttpClient();
HttpPost postRequest = new HttpPost(Def.BASE_URL
+ String.format("/%d/list", this.user_id));
final int maxBufferSize = 10 * 1024;
mBody = new FileBody(mFile, fileName, "image/jpeg", "UTF-8"){
int bytesRead, bytesAvailable, bufferSize;
InputStream mInputStream = super.getInputStream();
int dataLength = mInputStream.available();
@Override
public void writeTo(OutputStream out) throws IOException {
bytesAvailable = mInputStream.available();
bufferSize = Math.min(bytesAvailable, maxBufferSize);
buffer = new byte[bufferSize];
bytesRead = mInputStream.read(buffer, 0, bufferSize);
while (bytesRead > 0) {
out.write(buffer, 0, bufferSize);
bytesAvailable = mInputStream.available();
bufferSize = Math.min(bytesAvailable, maxBufferSize);
bytesRead = mInputStream.read(buffer, 0, bufferSize);
int progress = (int) (100 - ((bytesAvailable * 1.0) / dataLength) * 100);
Log.d(TAG, "Result: " + progress + "%");
if (progress == 100) {
iNotifyProgressBar.notify(progress, UploadStatus.SUCCESS);
} else {
iNotifyProgressBar.notify(progress, UploadStatus.UPLOADING);
}
}
}
@Override
protected void finalize() throws Throwable {
super.finalize();
if (mInputStream != null) {
mInputStream.close();
}
}
};
MultipartEntity reqEntity = new MultipartEntity(HttpMultipartMode.BROWSER_COMPATIBLE);
reqEntity.addPart("photo", mBody);
postRequest.setEntity(reqEntity);
HttpResponse response = httpClient.execute(postRequest);
InputStream mInputStream = response.getEntity().getContent();
return mInputStream == null ? null : mInputStream;
} catch (IOException e) {
Log.e(TAG, "Error causes during upload image: " + e.getMessage());
e.printStackTrace();
iNotifyProgressBar.notify(0, UploadStatus.FAILED);
} finally {
Log.v(TAG, "Close file");
if (mFile != null) {
mFile = null;
}
if (mBody != null) {
mBody = null;
}
if (dcimDir != null) {
dcimDir = null;
}
}
return null;
}
@Override
protected void onPostExecute(InputStream result) {
if (result == null) {
iNotifyProgressBar.notify(0, UploadStatus.FAILED);
} else {
PhotoInfo mPhotoInfo = ApiUtils.convertStreamToPhotoInfo(result);
if (mAddNewItemOnGridView != null && mPhotoInfo != null) {
mAddNewItemOnGridView.notifyAdded(mPhotoInfo);
Log.d(TAG, "Upload completed!!");
} else {
Log.d(TAG, "Upload is failed!!");
iNotifyProgressBar.notify(0, UploadStatus.FAILED);
}
}
}
@Override
protected void onPreExecute() {
super.onPreExecute();
}
}