13.android读取远程图片案例

注意访问网络权限：<uses-permission android:name="android.permission.INTERNET"/>

关键代码：

Bitmap bitmap=BitmapFactory.decodeByteArray(data, 0, data.length);

imageview.setImageBitmap(bitmap);

完整案例：

package caicai.cn.netimag;

import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

public class imageserver {
public static byte[] getimage(String path) throws Exception{ //连接远程网址
URL url=new URL(path);
HttpURLConnection conn=(HttpURLConnection) url.openConnection();
conn.setConnectTimeout(5000);
conn.setRequestMethod("GET");
if(conn.getResponseCode()==200){
InputStream instream=conn.getInputStream();
return read(instream);
}
return null;
}

private static byte[] read(InputStream instream) throws Exception{ //  读取数据流，返回字节数据流
ByteArrayOutputStream outstream=new ByteArrayOutputStream();
byte[] buffer=new byte[1024];
while( (instream.read(buffer))!=-1){
outstream.write(buffer);
}
instream.close();
return outstream.toByteArray();
}
}

//////////////////////////////////////////////////////////////////////

package caicai.cn.netimag;

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageView;
import android.widget.Toast;

public class NetimageActivity extends Activity {

public ImageView imageview;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
imageview=(ImageView) findViewById(R.id.imageview);
}
public void submit(View v){
String path="http://192.168.0.117/testxml/bottom.png";
try{
  byte[] data=imageserver.getimage(path);
  Bitmap bitmap=BitmapFactory.decodeByteArray(data, 0, data.length);   //生成图片工厂
imageview.setImageBitmap(bitmap);  //显示图片
}catch(Exception e){

Toast.makeText(getApplicationContext(), "出错了", 1).show();
}
}
}

//////////////////////////////////////////////////

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >

<Button
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="获取网络图片"
android:onClick="submit"/>
<ImageView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/imageview"
android:src="@drawable/ic_launcher"
/>

</LinearLayout>

///////////////////////////////////////////////////////////////

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="caicai.cn.netimag"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk android:minSdkVersion="8" />
<uses-permission android:name="android.permission.INTERNET"/>

<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name" >
<activity
android:label="@string/app_name"
android:name=".NetimageActivity" >
<intent-filter >
<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>

</manifest>