从AsyncTask的更新进度对话框进度不能建立 [英] Updating progress on progress dialog from AsyncTask can't build
本文介绍了从AsyncTask的更新进度对话框进度不能建立的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我不能建立我的项目，因为日食给错误
下面是按钮单击事件谁开始下载
button.setOnClickListener（新View.OnClickListener（）{
@覆盖
公共无效的onClick（视图v）{
ProgressDialog mProgressDialog;
mProgressDialog =新ProgressDialog（Test.this）;
mProgressDialog.setMessage（Pobieranie）;
mProgressDialog.setIndeterminate（假）;
mProgressDialog.setMax（100）;
mProgressDialog.setProgressStyle（ProgressDialog.STYLE_HORIZONTAL）;
DownloadFile downloadFile =新DownloadFile（）;
downloadFile.execute（http://google.com）;
}
}）;
和AsyncTask的功能
私有类DownloadFile扩展的AsyncTask＆LT;字符串，整数，字符串＆GT; {
[...]
@覆盖
在preExecute保护无效（）{
super.on preExecute（）;
mProgressDialog.show（）; //这里日食告诉mProgressDialog解决不了
} @覆盖
保护无效onProgressUpdate（整数...进度）{
super.onProgressUpdate（进度）;
mProgressDialog.setProgress（进展[0]）; //这里日食告诉mProgressDialog解决不了
}
}
那么，我应该插入code谁创建我的进度对话框？
解决方案
嘿，你需要提供数
在此输入code 私有类DownloadFile扩展的AsyncTask＆LT;字符串，整数，字符串＆GT; {
ProgressDialog mProgressDialog;
字符串文件名= NULL;
@覆盖
在preExecute保护无效（）{
super.on preExecute（）;
//创建进度
mProgressDialog =新ProgressDialog（Task.this）;
//设置你的进度标题
mProgressDialog.setTitle（下载）;
mProgressDialog.setIcon（R.drawable.dwnload）;
//设置您的进度信息
mProgressDialog.setMessage（更新应用程序版本，请等一下！）;
mProgressDialog.setIndeterminate（假）;
mProgressDialog.setMax（100）;
mProgressDialog.setProgressStyle（ProgressDialog.STYLE_HORIZONTAL）;
//显示进度
mProgressDialog.setCancelable（假）;
// mProgressDialog.setCanceledOnTouchOutside（假）;
mProgressDialog.show（）;
} @覆盖
保护字符串doInBackground（字符串... SURL）{
尝试{
字符串apkurl =http://google.com/\"+fileName;
网址URL =新的URL（apkurl）;
HttpURLConnection的C =（HttpURLConnection类）网址
.openConnection（）;
c.setRequestMethod（GET）;
c.setDoOutput（真）;
c.connect（）;
INT文件长度= c.getContentLength（）;
//文件文件=新的文件（路径）;
如果（file.exists（））
{
file.delete（）;
}
file.mkdirs（）;
文件OUTPUTFILE =新的文件（文件，文件名）;
最终的FileOutputStream FOS =新的FileOutputStream（OUTPUTFILE）; 最后InputStream为= c.getInputStream（）; 字节的数据[] =新的字节[1024];
总长= 0;
诠释计数;
而（（计数= is.read（数据））！= - 1）{
总+ =计数;
//发布进度
publishProgress（（int）的（总* 100 /文件长度））;
fos.write（数据0，计）;
} //关闭连接
fos.flush（）;
fos.close（）;
is.close（）; } } 赶上（例外五）{
//错误日志
Log.e（错误，e.getMessage（））;
e.printStackTrace（）;
}
返回null;
} @覆盖
保护无效onPostExecute（字符串结果）{
// TODO自动生成方法存根
mProgressDialog.dismiss（）; } @覆盖
保护无效onProgressUpdate（整数...进度）{
super.onProgressUpdate（进度）;
//更新进度
mProgressDialog.setProgress（进展[0]）; }}
I can't build my project because eclipse giving error
Here is button click event who starting download
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
ProgressDialog mProgressDialog;
mProgressDialog = new ProgressDialog(Test.this);
mProgressDialog.setMessage("Pobieranie");
mProgressDialog.setIndeterminate(false);
mProgressDialog.setMax(100);
mProgressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
DownloadFile downloadFile = new DownloadFile();
downloadFile.execute("http://google.com");
}
});
and AsyncTask function
private class DownloadFile extends AsyncTask<String, Integer, String> {
[...]
@Override
protected void onPreExecute() {
super.onPreExecute();
mProgressDialog.show(); // Here eclipse tell that "mProgressDialog cannot be resolved"
}
@Override
protected void onProgressUpdate(Integer... progress) {
super.onProgressUpdate(progress);
mProgressDialog.setProgress(progress[0]); // Here eclipse tell that "mProgressDialog cannot be resolved"
}
}
So where I should insert code who create my progress dialog?
解决方案
Hey you need to provide count
enter code here
private class DownloadFile extends AsyncTask<String, Integer, String> {
ProgressDialog mProgressDialog;
String fileName=null;
@Override
protected void onPreExecute() {
super.onPreExecute();
// Create ProgressBar
mProgressDialog = new ProgressDialog(Task.this);
// Set your ProgressBar Title
mProgressDialog.setTitle("Downloads");
mProgressDialog.setIcon(R.drawable.dwnload);
// Set your ProgressBar Message
mProgressDialog.setMessage("Updating App Version, Please Wait!");
mProgressDialog.setIndeterminate(false);
mProgressDialog.setMax(100);
mProgressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
// Show ProgressBar
mProgressDialog.setCancelable(false);
// mProgressDialog.setCanceledOnTouchOutside(false);
mProgressDialog.show();
}
@Override
protected String doInBackground(String... sUrl) {
try {
String apkurl = "http://google.com/"+fileName;
URL url = new URL(apkurl);
HttpURLConnection c = (HttpURLConnection) url
.openConnection();
c.setRequestMethod("GET");
c.setDoOutput(true);
c.connect();
int fileLength = c.getContentLength();
//File file = new File(PATH);
if(file.exists())
{
file.delete();
}
file.mkdirs();
File outputFile = new File(file, fileName);
final FileOutputStream fos = new FileOutputStream(outputFile);
final InputStream is = c.getInputStream();
byte data[] = new byte[1024];
long total = 0;
int count;
while ((count = is.read(data)) != -1) {
total += count;
// Publish the progress
publishProgress((int) (total * 100 / fileLength));
fos.write(data, 0, count);
}
// Close connection
fos.flush();
fos.close();
is.close();
}
}
catch (Exception e) {
// Error Log
Log.e("Error", e.getMessage());
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(String result) {
// TODO Auto-generated method stub
mProgressDialog.dismiss();
}
@Override
protected void onProgressUpdate(Integer... progress) {
super.onProgressUpdate(progress);
// Update the ProgressBar
mProgressDialog.setProgress(progress[0]);
}
}
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