AnsyncTask下载案例_AndroidstudioAsyncTask下载资源-CSDN文库

共4个文件

html：3个

xml：1个

Android

AsyncTask

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AnsyncTask下载功能.rar （4个子文件）

AnsyncTask下载功能

com

example

myapplication

FileDownTask.java.html 6KB

MainActivity.java.html 3KB

activity_main.xml 1009B

index.html 199B

<html> <head> <title>FileDownTask.java</title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <style type="text/css"> .s0 { color: #cc7832;} .s1 { color: #a9b7c6;} .s2 { color: #6897bb;} .s3 { color: #6a8759;} </style> </head> <body bgcolor="#2b2b2b"> <table CELLSPACING=0 CELLPADDING=5 COLS=1 WIDTH="100%" BGCOLOR="#606060" > <tr><td><center> FileDownTask.java </center></td></tr></table> <pre>package com.example.myapplication; import android.os.AsyncTask; import android.view.View; import android.widget.ProgressBar; import android.widget.TextView; import java.io.BufferedInputStream; import java.io.IOException; import java.io.InputStream; import java.net.HttpURLConnection; import java.net.MalformedURLException; import java.net.URL; public class FileDownTask extends AsyncTask<String, Integer, String> { private ProgressBar pb; private TextView tv; public FileDownTask(ProgressBar pb,TextView tv) { this.pb=pb; this.tv=tv; } @Override protected void onPreExecute() { super.onPreExecute(); pb.setVisibility(View.VISIBLE); } @Override protected String doInBackground(String... strings) { String str=null; try { URL url=new URL(strings[0]); HttpURLConnection coon=(HttpURLConnection) url.openConnection(); int totalsize=coon.getContentLength(); int currentsize=0; InputStream is=coon.getInputStream(); byte[] buffer=new byte[2048]; int length=0; while((length=is.read(buffer))!=-1){ currentsize=currentsize+length; publishProgress((int) ((float)currentsize/totalsize*100)); } is.close(); } catch (MalformedURLException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } return "下载完成"; } @Override protected void onProgressUpdate(Integer... values) { super.onProgressUpdate(values); pb.setProgress(values[0]); tv.setText("正在下载中..."); } @Override protected void onPostExecute(String s) { super.onPostExecute(s); tv.setText(s); } }</pre> </body> </html>