我是Android开发的菜鸟，我正在尝试在服务中执行AsyncTask。当我注释掉publishProgress方法时，Asynctask工作正常，但是当我尝试调用publishProgress时，我的应用程序在doInBackground方法中停止。它不会崩溃，它只是退出，当我用调试器运行应用程序时，会弹出一条eclipse错误消息，说明“Update Progress”遇到错误。这个相同的代码在Activity中可以正常工作但不在Service中。任何帮助解决这个问题都非常感谢。
我的代码：
我在哪里实例化进度条
@Override
public void onCreate() {
super.onCreate();
//https://gist.github.com/bjoernQ/6975256 <--Tutorial URL
layout_inflater = (LayoutInflater) getSystemService(LAYOUT_INFLATER_SERVICE);
wm = (WindowManager) getSystemService(Context.WINDOW_SERVICE);
WindowManager.LayoutParams params = new WindowManager.LayoutParams(WindowManager.LayoutParams.WRAP_CONTENT, WindowManager.LayoutParams.WRAP_CONTENT, WindowManager.LayoutParams.TYPE_SYSTEM_ALERT, WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE | WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL, PixelFormat.TRANSLUCENT);
params.gravity = Gravity.LEFT | Gravity.CENTER_VERTICAL;
params.x = 0;
params.y = 0;
topLeftView = layout_inflater.inflate(R.layout.layout_service, null);
wm.addView(topLeftView, params);
btn_retry = (Button) topLeftView.findViewById(R.id.btn_retry);
btn_cancel = (Button) topLeftView.findViewById(R.id.btn_cancel);
progress_bar = (VerticalProgressBar) topLeftView.findViewById(R.id.progressbar);
upload_image = (ImageView) topLeftView.findViewById(R.id.imageView1);
btn_retry.setOnTouchListener(this);
btn_retry.setOnClickListener(this);
btn_cancel.setOnTouchListener(this);
btn_cancel.setOnClickListener(this);
progress_bar.setOnTouchListener(this);
upload_image.setOnTouchListener(this);
topLeftView.setOnTouchListener(this);
}
class saveMedia extends AsyncTask<Void, Integer, String> {
// @Override
protected void onPreExecute() {
progress_bar.setProgress(0);
progress_bar.setMax(100);
}
@Override
protected String doInBackground(Void... params) {
HttpURLConnection connection = null;
DataOutputStream outputStream = null;
DataInputStream inputStream = null;
String urlServer = "";
if(is_club){ //For Clubs
urlServer = "http://example.com/App/ppfunctions.php?action=upload&club_id=" + club_id + "&club_name=" + club_name + "&user_id=" + user_id + "&user_name=" + user_name + "&club_city=" + club_city + "&comment=" + comments + "&price=" + price + "&line=" + line + "&capacity=" + capacity ;
}else{ //For Parties
urlServer = "http://example.com/App/ppfunctions.php?action=upload_party&club_id=" + party_id + "&club_name=" + party_name + "&user_id=" + user_id + "&user_name=" + user_name + "&comment=" + comments + "&price=" + price + "&line=" + line + "&capacity=" + capacity ;
}
String lineEnd = "\r\n";
String twoHyphens = "--";
String boundary = "*****";
int bytesRead, bytesAvailable, bufferSize;
byte[] buffer;
int maxBufferSize = 15*1024*1024;
try{
URL url = new URL(urlServer);
connection = (HttpURLConnection) url.openConnection();
// Allow Inputs & Outputs
connection.setDoInput(true);
connection.setDoOutput(true);
connection.setUseCaches(false);
// Enable POST method
connection.setRequestMethod("POST");
connection.setRequestProperty("Connection", "Keep-Alive");
connection.setRequestProperty("Content-Type", "multipart/form-data;boundary="+boundary);
outputStream = new DataOutputStream( connection.getOutputStream() );
outputStream.writeBytes(twoHyphens + boundary + lineEnd);
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd-HH:mm:ss");
Date date = new Date();
SharedPreferences preferences = getSharedPreferences("PPPref", MODE_WORLD_READABLE);
String filename = "";
if(is_photo){
filename = String.valueOf(System.currentTimeMillis()) + ".jpg";
}else{
filename = String.valueOf(System.currentTimeMillis()) + ".mp4";
}
outputStream.writeBytes("Content-Disposition: form-data; name=\"uploadedfile\";filename=\"" + filename +"\"" + lineEnd);
outputStream.writeBytes(lineEnd);
bytesAvailable = fileInputStream.available();
bufferSize = Math.min(bytesAvailable, maxBufferSize);
buffer = new byte[bufferSize];
int sentBytes=0;
// Read file
bytesRead = fileInputStream.read(buffer, 0, bufferSize);
while (bytesRead > 0){
outputStream.write(buffer, 0, bufferSize);
bytesAvailable = fileInputStream.available();
bufferSize = Math.min(bytesAvailable, maxBufferSize);
bytesRead = fileInputStream.read(buffer, 0, bufferSize);
sentBytes += bufferSize;
publishProgress((int)(sentBytes * 100 / bytesAvailable)); //<--Dies here.
}
outputStream.writeBytes(lineEnd);
outputStream.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd);
// Responses from the server (code and message)
int serverResponseCode = connection.getResponseCode();
String serverResponseMessage = connection.getResponseMessage();
StringBuilder response = null;
DataInputStream dis = null;
String con = null;
try {
dis = new DataInputStream(connection.getInputStream());
response = new StringBuilder();
String line2;
con = dis.readLine();
while ((line2 = dis.readLine()) != null) {
response.append(line2);
}
}catch(Exception e){
}
Log.e("s", con );
fileInputStream.close();
outputStream.flush();
outputStream.close();
//Kill Service
stopSelf();
//onDestroy();
}catch (Exception ex){
ex.printStackTrace();
}
return null;
}
@Override
protected void onProgressUpdate(Integer... progress) {
super.onProgressUpdate(progress);
// Update the ProgressBar
progress_bar.setProgress(progress[0]);
}
@Override
protected void onPostExecute(String result) {
/*dialog.dismiss();
Intent intent = new Intent (Share_Media_Activity.this, PhotoVideo_Activity.class);
startActivity(intent); */
}
}
}
答案 0 :(得分：0)
之前我遇到过这个问题。在while循环中检查你的bytesAvailable = fileInputStream.available（）;正在回归正在回归零。如果是这样，它可能会导致算术异常。