Android开发实现加载网络图片并下载至本地SdCard的方法-创新互联
本文实例讲述了Android开发实现加载网络图片并下载至本地SdCard的方法。分享给大家供大家参考,具体如下:
创新互联建站于2013年开始,先为桥东等服务建站,桥东等地企业,进行企业商务咨询服务。为桥东企业网站制作PC+手机+微官网三网同步一站式服务解决您的所有建站问题。package com.example.myimagedemo; import java.io.BufferedOutputStream; import java.io.File; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.net.HttpURLConnection; import java.net.URL; import android.app.Activity; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.os.Bundle; import android.os.Environment; import android.os.Handler; import android.os.Message; import android.widget.ImageView; public class MainActivity extends Activity { private ImageView mImageView; private String imgPath="/file/tupian/20230213/124530.gif"; private File cache;//缓存路径 Handler handler=new Handler(new Handler.Callback() { @Override public boolean handleMessage(Message msg) { //显示 Bitmap b=(Bitmap)msg.obj; mImageView.setImageBitmap(b); //保存至本地 File imgFile=new File(cache,"woca.jpg"); try { BufferedOutputStream bos=new BufferedOutputStream(new FileOutputStream(imgFile)); b.compress(Bitmap.CompressFormat.JPEG,80,bos); bos.flush(); bos.close(); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } return false; } }); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mImageView=(ImageView)findViewById(R.id.mImageView); //创建缓存路径 //Environment.getExternalStorageDirectory()获取手机内存卡根路径 cache=new File(Environment.getExternalStorageDirectory(),"Test"); if(!cache.exists()){ cache.mkdirs(); } //耗时操作都要放在子线程操作 //开启子线程获取输入流 new Thread(new Runnable() { @Override public void run() { HttpURLConnection conn=null; InputStream is=null; try { URL url=new URL(imgPath); //开启连接 conn=(HttpURLConnection) url.openConnection(); //设置连接超时 conn.setConnectTimeout(5000); //设置请求方式 conn.setRequestMethod("GET"); //conn.connect(); if(conn.getResponseCode()==200){ is=conn.getInputStream(); Bitmap b=BitmapFactory.decodeStream(is); //把输入流转化成bitmap格式,以msg形式发送至主线程 Message msg=new Message(); msg.obj=b; handler.sendMessage(msg); } } catch (Exception e) { e.printStackTrace(); }finally{ try { //用完记得关闭 is.close(); conn.disconnect(); } catch (IOException e) { e.printStackTrace(); } } } }).start(); } }
网站题目:Android开发实现加载网络图片并下载至本地SdCard的方法-创新互联
URL分享:http://pwwzsj.com/article/hjeoo.html