查看图片的Domo

<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://www.photophoto.cn/m10/018/048/0180480008.jpg" />  

  

    <Button  

        android:id="@+id/btnView"  

        android:layout_width="wrap_content"  

        android:layout_height="wrap_content"  

        android:layout_gravity="center"  

        android:background="@drawable/button_bg"  

        android:onClick="viewImage"  

        android:text="浏览" />  

  

</LinearLayout>  

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分析：定义了<span style="font-family: Arial, Helvetica, sans-serif;">ImageView组件存放图片，又定义了</span><span style="font-family: Arial, Helvetica, sans-serif;">EditText、</span><span style="font-family: Arial, Helvetica, sans-serif;">Button组件用于事件处理</span>  

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<span style="font-family: Arial, Helvetica, sans-serif;"></span><pre name="code" class="html">package com.bzu.gxs;  

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.os.Handler;  

import android.os.Message;  

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.EditText;  

import android.widget.ImageView;  

import android.widget.Toast;  

public class MainActivity extends Activity {  

    private EditText etImageUrl;  

    private ImageView ivImage;  

    public static final int SHOWIMAGE=1;  

    public static final int SHOWFAIL=0;  

    // Handler 处理事件  

    private Handler handler=new Handler(){  

        public void handleMessage(android.os.Message msg) {  

            switch (msg.what) {  

            case SHOWIMAGE:  

                Bitmap bitmap=(Bitmap) msg.obj;  

                ivImage.setImageBitmap(bitmap);  

                break;  

  

            case SHOWFAIL:  

                ivImage.setImageResource(R.drawable.button_bg);  

                Toast.makeText(MainActivity.this, "显示图片失败", Toast.LENGTH_LONG).show();  

                break;  

  

            default:  

                break;  

            }  

        };  

    };  

    @Override  

    protected void onCreate(Bundle savedInstanceState) {  

        super.onCreate(savedInstanceState);  

        setContentView(R.layout.activity_main);  

        initViews();  

        ivImage.setImageResource(R.drawable.button_bg);  

    }  

    // 查找的ID  

    private void initViews() {  

       etImageUrl=(EditText) findViewById(R.id.etImageUrl);  

       ivImage=(ImageView) findViewById(R.id.ivImage);  

    }  

  

    // 按钮点击事件  

    public void viewImage(View view){  

        final String imageUrl=etImageUrl.getText().toString();  

        if(TextUtils.isEmpty(imageUrl)){  

            Toast.makeText(this, "图片路径不能为空", Toast.LENGTH_LONG).show();  

        }else{  

            new Thread(){  

                    public void run() {  

                        try {  

                            URL url=new URL(imageUrl);  

                            HttpURLConnection httpURLConnection=(HttpURLConnection) url.openConnection();  

                            httpURLConnection.setRequestMethod("GET");  

                            httpURLConnection.setConnectTimeout(5000);  

                            int responseCode=httpURLConnection.getResponseCode();  

                            if(responseCode==200){  

                                InputStream inputStream=httpURLConnection.getInputStream();  

                                Bitmap bitmap=BitmapFactory.decodeStream(inputStream);  

                                Message message=new Message();  

                                message.what=SHOWIMAGE;  

                                message.obj=bitmap;  

                                //ivImage.setImageBitmap(bitmap);  

                                handler.sendMessage(message);  

                            }else{  

                                Message message=new Message();  

                                message.what=SHOWFAIL;  

                                handler.sendMessage(message);  

                            }  

                        } catch (MalformedURLException e) {  

                            e.printStackTrace();  

                        } catch (IOException e) {  

                            e.printStackTrace();  

                        }  

                }  

            }.start();  

        }  

    }  

}