来自:http://blog.csdn.net/jianghuiquan/article/details/8641283
Android手机上,我们常用ImageView显示图片,我们本章获取网络图片并显示在ImageView中。
一、设计界面
1、布局文件
打开res/layout/activity_main.xml文件。
输入以下代码:
- <?xml version="1.0" encoding="utf-8"?>
- <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
- android:orientation="vertical"
- android:layout_width="match_parent"
- android:layout_height="match_parent" >
-
- <ImageView
- android:id="@+id/imagephoto"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content" />
-
- </LinearLayout>
二、程序文件
打开“src/com.genwoxue.networkphoto/MainActivity.java”文件。
然后输入以下代码:
- package com.genwoxue.networkphoto;
-
- import java.io.IOException;
- import java.io.InputStream;
- import java.net.HttpURLConnection;
- import java.net.MalformedURLException;
- import java.net.URL;
- import android.app.Activity;
- import android.graphics.Bitmap;
- import android.graphics.BitmapFactory;
- import android.os.AsyncTask;
- import android.os.Bundle;
- import android.widget.ImageView;
-
- public class MainActivity extends Activity {
-
- private ImageView imView;
- @Override
- public void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.activity_main);
-
- imView = (ImageView) findViewById(R.id.imagephoto);
- String imageUrl = "http://img.baidu.com/img/image/ilogob.gif";
-
- new NetworkPhoto().execute(imageUrl);
- }
-
-
-
-
- class NetworkPhoto extends AsyncTask<String, Integer, Bitmap> {
- public NetworkPhoto() {
- }
-
-
- @Override
- protected Bitmap doInBackground(String... urls) {
- URL url = null;
- Bitmap bitmap = null;
- HttpURLConnection conn=null;
- InputStream is=null;
-
- try {
- url = new URL(urls[0]);
- } catch (MalformedURLException e) {
- e.printStackTrace();
- }
-
- try {
- conn = (HttpURLConnection) url.openConnection();
- conn.setDoInput(true);
- conn.connect();
- is = conn.getInputStream();
- bitmap = BitmapFactory.decodeStream(is);
- is.close();
- } catch (IOException e) {
- e.printStackTrace();
- } finally {
- if(conn!=null){
- conn.disconnect();
- conn=null;
- }
-
- if(is!=null) {
- try {
- is.close();
- } catch (IOException e) {
- e.printStackTrace();
- }
- is=null;
- }
- }
- return bitmap;
- }
-
-
-
- @Override
- protected void onPostExecute(Bitmap bitmap) {
-
- imView.setImageBitmap(bitmap);
- }
- }
-
- }
三、配置文件
打开“AndroidManifest.xml”文件。
然后输入以下代码:
- <?xml version="1.0" encoding="utf-8"?>
- <manifest xmlns:android="http://schemas.android.com/apk/res/android"
- package="com.genwoxue.networkphoto"
- android:versionCode="1"
- android:versionName="1.0" >
-
- <uses-sdk
- android:minSdkVersion="10"
- android:targetSdkVersion="14" />
-
- <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.genwoxue.networkphoto.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>
注意:需要在AndroidManifest.xml文件中添加权限:
<uses-permission android:name="android.permission.INTERNET" />
andriod 读取网络图片
原文:http://www.cnblogs.com/gisoracle/p/5227552.html