浅入浅出Android（015）：使用ImageView显示网络图片

Androidstudio版本是0.8.6，android虚拟机版本是4.*。

1、创建项目MyApplication

2、添加访问网络的权限

在AndroidManifest.xml中添加<uses-permission android:name="android.permission.INTERNET" />，该文件最终内容是：

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.example.letian.myapplication" >    <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=".MyActivity"            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>

3、修改布局文件activity_my.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:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    android:paddingBottom="@dimen/activity_vertical_margin"    tools:context=".MyActivity">    <Button        android:id="@+id/button01"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="获取图片" />    <ImageView        android:id="@+id/imageview01"        android:layout_below="@id/button01"        android:layout_width="wrap_content"        android:layout_height="wrap_content" /></RelativeLayout>

4、修改MyActivity.java

package com.example.letian.myapplication;import android.app.Activity;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.view.View;import android.widget.Button;import android.widget.ImageView;import org.apache.http.HttpResponse;import org.apache.http.HttpStatus;import org.apache.http.client.methods.HttpGet;import org.apache.http.impl.client.DefaultHttpClient;import java.io.InputStream;public class MyActivity extends Activity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_my);        final Button btn01 = (Button) this.findViewById(R.id.button01);        final ImageView iv01 = (ImageView) this.findViewById(R.id.imageview01);        final Handler handler = new Handler(){            @Override            public void handleMessage(Message msg) {                super.handleMessage(msg);                Bitmap bitmap=(Bitmap)msg.obj;                iv01.setImageBitmap(bitmap);            }        };        final Runnable runnable = new Runnable(){            @Override            public void run() {                HttpGet getRequest = new HttpGet("http://static.oschina.net/uploads/user/470/940565_100.jpg?t=1400854721000");                getRequest.addHeader("User-Agent", " Mozilla/5.0 (Windows NT 6.3; WOW64; rv:32.0) Gecko/20100101 Firefox/32.0");                try {                    HttpResponse response = new DefaultHttpClient().execute(getRequest);                    if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {                        InputStream imageStream = response.getEntity().getContent();                        Bitmap result = BitmapFactory.decodeStream(imageStream);                        Message msg = new Message();                        msg.obj=result;                        handler.sendMessage(msg);                    } else {                        throw new Exception("读取失败");                    }                } catch (Exception e) {                    try {                        throw new Exception("读取失败:\n"+e.toString());                    } catch (Exception e1) {                        e1.printStackTrace();                    }                }            }        };        btn01.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                new Thread(runnable).start();            }        });    }}

上面的runnable中HTTP请求使用了已经封装好的HttpGet，也可以使用HttpURLConnection，如下：

final Runnable runnable = new Runnable(){    @Override    public void run() {        try {            URL imageUrl = new URL("http://static.oschina.net/uploads/user/470/940565_100.jpg?t=1400854721000");            HttpURLConnection conn = (HttpURLConnection)imageUrl.openConnection();            conn.setRequestProperty("User-Agent", "Mozilla/5.0 ...");            conn.connect();            InputStream is = conn.getInputStream();            Bitmap bitmap = BitmapFactory.decodeStream(is);            is.close();            Message msg = new Message();            msg.obj = bitmap;            handler.sendMessage(msg);        } catch (Exception e) {            e.printStackTrace();        }    }};

5、效果

获取图片：

参考：

http://stackoverflow.com/questions/13012702/android-sdk-obtain-image-from-http-get

http://blog.csdn.net/nasebanaru/article/details/17201783

1、创建项目MyApplication

2、添加访问网络的权限

3、修改布局文件activity_my.xml

4、修改MyActivity.java

5、效果

参考：

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