读取网路图片

1.MainActivity

package com.example.httpimagedemo;import java.io.ByteArrayOutputStream;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.widget.ImageView;public class MainActivity extends Activity {private static final String PATH = "http://img1.imgtn.bdimg.com/it/u=3199407981,256809178&fm=23&gp=0.jpg";private ImageView img = null;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);img = (ImageView) findViewById(R.id.img);new Thread(new mThread()).start();}private class mThread implements Runnable {@Overridepublic void run() {try {byte data[] = getUrlData();Bitmap bm = BitmapFactory.decodeByteArray(data, 0, data.length); // 生成图片img.setImageBitmap(bm);} catch (Exception e) {e.printStackTrace();}}}public byte[] getUrlData() throws Exception {ByteArrayOutputStream bos = null; // 内存输出流try {URL url = new URL(PATH);bos = new ByteArrayOutputStream();byte data[] = new byte[1024]; // 每次读取1024HttpURLConnection conn = (HttpURLConnection) url.openConnection(); // 打开InputStream input = conn.getInputStream(); // 取得输入流int len = 0; // 读取的长度while ((len = input.read(data)) != -1) { // 如果没有的读取到底部(如果是底部的话,会返回-1),则继续读取bos.write(data, 0, len); // 向内存中保存}return bos.toByteArray();// 变为字节数组返回} catch (Exception e) {throw e;} finally {bos.close();// 关闭输入流}}}

2.activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context=".MainActivity" >    <ImageView        android:id="@+id/img"        android:layout_width="wrap_content"        android:layout_height="wrap_content" /></RelativeLayout>

3.AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.example.httpimagedemo"    android:versionCode="1"    android:versionName="1.0" >    <uses-sdk        android:minSdkVersion="8"        android:targetSdkVersion="17" />    <uses-permission android:name="android.permission.INTERNET" />    <application        android:allowBackup="true"        android:icon="@drawable/ic_launcher"        android:label="@string/app_name"        android:theme="@style/AppTheme" >        <activity            android:name="com.example.httpimagedemo.MainActivity"            android:label="@string/app_name" >            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>    </application></manifest>

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