Android利用HTTP协议加载网络图片

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转载请注明出处：http://blog.csdn.net/u010214991/article/details/48493647

给出一张图片的网址，我们怎么把这张图片加载到我们的ImageView控件显示呢？

由于采用网络请求，我们必须在AndroidManifest.xml添加权限<uses-permission android:name="android.permission.INTERNET"/>

由于是网络请求数据，我们必须在开辟一条线程来完成数据请求，得到数据后最终回到主线程刷新UI显示图片即可。

好了，该说的已经说了，下面直接贴代码了。

1、MainActivity.java

import java.io.IOException;import org.apache.http.HttpResponse;import org.apache.http.HttpStatus;import org.apache.http.client.ClientProtocolException;import org.apache.http.client.HttpClient;import org.apache.http.client.methods.HttpGet;import org.apache.http.impl.client.DefaultHttpClient;import org.apache.http.util.EntityUtils;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.widget.ImageView;public class MainActivity extends Activity {private ImageView imageView;private final String PATH = "https://www.baidu.com/img/bdlogo.png";@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);imageView = (ImageView) findViewById(R.id.imageView1);new Thread(new Runnable() {@Overridepublic void run() {// TODO Auto-generated method stubHttpClient httpClient = new DefaultHttpClient();HttpGet httpGet = new HttpGet(PATH);try {HttpResponse httpResponse = httpClient.execute(httpGet);if (httpResponse.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {byte[] data = EntityUtils.toByteArray(httpResponse.getEntity());Message message = Message.obtain();message.obj = data;message.what = RESULT_OK;handler.sendMessage(message);}} catch (ClientProtocolException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();} finally {if (httpClient != null&& httpClient.getConnectionManager() != null) {httpClient.getConnectionManager().shutdown();}}}}).start();}public Handler handler = new Handler() {public void handleMessage(Message msg) {if (msg.what == RESULT_OK) {byte[] data = (byte[]) msg.obj;Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0,data.length);imageView.setImageBitmap(bitmap);}};};}

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/imageView1"        android:layout_width="match_parent"        android:layout_height="match_parent"           android:src="@drawable/ic_launcher" /></RelativeLayout>

3、AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.example.de"    android:versionCode="1"    android:versionName="1.0" >    <uses-sdk        android:minSdkVersion="8"        android:targetSdkVersion="18" />    <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.de.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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