Android:AsyncTask,如何更新ProgressDialog增量 [英] Android : AsyncTask, how can update ProgressDialog increment
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问题描述
我想解析网页并水平显示进度对话框样式并将其逐字节递增,这是可能的吗?
I want to parse a webpage and visual a progressdialog style horizontal and increment it byte to byte, it's possibile ?
推荐答案
试试这个,
创建一个 ProgressDialog.
ProgressDialog mProgressDialog = new ProgressDialog(Your_Activity.this);
mProgressDialog.setMessage("Here you can set a message");
mProgressDialog.setIndeterminate(false);
mProgressDialog.setMax(100);
mProgressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
mProgressDialog.show();
MyAsyncTask obj = new MyAsyncTask ();
obj.execute("url");
您的 AsyncTask 类.
private class MyAsyncTask extends AsyncTask<String, Integer, String>{
@Override
protected String doInBackground(String... url) {
int count;
try {
URL url = new URL(url[0]);
URLConnection connection = url.openConnection();
connection.connect();
// this will be useful so that you can show a tipical 0-100% progress bar
int length = connection.getContentLength();
// downlod the file
InputStream input = new BufferedInputStream(url.openStream());
OutputStream output = new FileOutputStream("/sdcard/file_name.txt");
byte data[] = new byte[1024];
long total = 0;
while ((count = input.read(data)) != -1) {
total += count;
// publishing the progress....
publishProgress((int)(total*100/length));
output.write(data, 0, count);
}
output.flush();
output.close();
input.close();
} catch (Exception e) {}
return null;
}
@Override
public void onProgressUpdate(String... args){
mProgressDialog.setProgress(args[0]);
}
}
}
您必须在 AndroidManifest 文件中授予这些权限.
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
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