查看网络上图片的功能实现

首先在AndroidManifest.xml中给程序加上访问Internet的权限：

<uses-permissionandroid:name="android.permission.INTERNET" /> 

 

         然后在布局文件中加入一个ImageView，用来显示网络上的图片：

<?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" >
   
    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/hello" />
    <ImageView  
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/imageView" />
   
</LinearLayout>

在主程序的Activity中写从网络中得到图片，并转化成InputStream，然后再转化成可以显示在ImageView里的Bitmap。

 

package com.image;
   
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.Bundle;
import android.widget.ImageView;
   
public class NetImageActivity extends Activity {
    /** Called when the activity is first created. */
     String imageUrl = "http://content.52pk.com/files/100623/2230_102437_1_lit.jpg";   
     Bitmap bmImg;   
     ImageView imView;   
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        imView = (ImageView) findViewById(R.id.imageView);   
        imView.setImageBitmap(returnBitMap(imageUrl));   
    }
       
    public Bitmap returnBitMap(String url){
        URL myFileUrl = null;   
        Bitmap bitmap = null;  
        try {   
            myFileUrl = new URL(url);   
        } catch (MalformedURLException e) {   
            e.printStackTrace();   
        }   
        try {   
            HttpURLConnection conn = (HttpURLConnection) myFileUrl   
              .openConnection();   
            conn.setDoInput(true);   
            conn.connect();   
            InputStream is = conn.getInputStream();   
            bitmap = BitmapFactory.decodeStream(is);   
            is.close();   
        } catch (IOException e) {   
              e.printStackTrace();   
        }   
              return bitmap;   
    }   
}