Android使用ImageView显示网络图片

【Android使用ImageView显示网络图片】笛里谁知壮士心，沙头空照征人骨。这篇文章主要讲述Android使用ImageView显示网络图片相关的知识，希望能为你提供帮助。
本案例使用ImageView 简单的实现了网络图片的调用。当中注意事项。由于用到了网络，这里採用了HttpClient方法訪问网络联接，关于怎样使用，可參照文章?Android中使用HttpClient实现HTTP通信效果?，因此。须要注意配置网络权限问题。以及须要使用新线程及Handler来更新Activity，不然会直接报错Not Main Thread看实例：MainActivity.java

package com.example.imageview; import android.os.Bundle; import android.os.Handler; import android.app.Activity; import android.graphics.Bitmap; import android.view.Menu; import android.widget.ImageView; public class MainActivity extends Activity { private Bitmap bm = null; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); final Handler handler = new Handler(); new Thread() { public void run() { bm = new ApacheHttpClient() .getHttpBmp("http://www.qilujiaju.com/data/attachment/block/c9/c960ba426890a8ddbfc35d2b4b0d97c9.jpg"); handler.post(new Runnable() {@Override public void run() { // TODO Auto-generated method stub ImageView imageView = (ImageView) findViewById(R.id.imageView1); imageView.setImageBitmap(bm); } }); } }.start(); }@Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.activity_main, menu); return true; }}

ApacheHttpClient.java

package com.example.imageview; import java.io.IOException; import java.io.InputStream; 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 android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.util.Log; public class ApacheHttpClient { private static final String TAG = "Error"; public InputStream httpGet(String url) { InputStream result = null; HttpClient httpClient = new DefaultHttpClient(); HttpGet httpGet = new HttpGet(url); HttpResponse httpResponse = null; try { httpResponse = httpClient.execute(httpGet); int httpStatus = httpResponse.getStatusLine().getStatusCode(); if (httpStatus == HttpStatus.SC_OK) { InputStream in = httpResponse.getEntity().getContent(); try { result = in; } catch (Exception e) { Log.i(TAG, "Exception"); // TODO Auto-generated catch block e.printStackTrace(); } } else { result = null; } } catch (ClientProtocolException e) { // TODO Auto-generated catch block e.printStackTrace(); Log.i(TAG, "ClientProtocolException"); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); Log.i(TAG, "ClientProtocolException"); } return result; }public Bitmap getHttpBmp(String url) { Bitmap bm = null; InputStream is = httpGet(url); bm = BitmapFactory.decodeStream(is); return bm; } }

AndroidMainFest.xml

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xml version="1.0" encoding="utf-8"?> < manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.imageview" android:versionCode="1" android:versionName="1.0" > < uses-sdk android:minSdkVersion="8" android:targetSdkVersion="16" /> < 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.imageview.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>

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" tools:context=".MainActivity" > < ImageView android:id="@+id/imageView1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:layout_alignParentTop="true" android:src="https://www.songbingjia.com/android/@drawable/app" /> < /RelativeLayout>

这是一个完整的实例，可直接执行于模拟器或真机。