查看网络图片

1建立activities_main.xml 代码如下：

<LinearLayout 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:orientation="vertical"
    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/ivImage"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:layout_weight="1" />

    <EditText
        android:id="@+id/etImageUrl"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:ems="10"
        android:hint="请输入图片的地址"
        android:text="http://pic.nipic.com/2007-11-08/2007118192311804_2.jpg"/>

    <Button
        android:id="@+id/btnView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:onClick="viewImage"
        android:text="浏览" />

</LinearLayout>

2JAVA类：

package com.hnz.netimagetest;

import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

import android.os.Bundle;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.text.TextUtils;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.Toast;

public class MainActivity extends Activity {
 private EditText EtUrl;
 private ImageView IvShow;
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        EtUrl=(EditText)findViewById(R.id.etImageUrl);
        IvShow=(ImageView) findViewById(R.id.ivImage);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
    
    public void viewImage(View view){
     String path=EtUrl.getText().toString();
     if(TextUtils.isEmpty(path)){
      Toast.makeText(this, "图片路径不能为空", Toast.LENGTH_SHORT).show();
     }
     else{
      try {
    URL url=new URL(path);
    HttpURLConnection httpURLConnection=(HttpURLConnection) url.openConnection();
    httpURLConnection.setRequestMethod("GET");
    httpURLConnection.setConnectTimeout(5000);
    int responsecode=httpURLConnection.getResponseCode();
    if(responsecode==200){
     InputStream is=httpURLConnection.getInputStream();
     Bitmap bm=BitmapFactory.decodeStream(is);
     IvShow.setImageBitmap(bm);
    }
    else{
     Toast.makeText(this, "显示图片失败", Toast.LENGTH_SHORT).show();
    }
   } catch (MalformedURLException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   } catch (IOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   }
     }
    }
    
}