图片显示

 

activity.xml
 

<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://epaper.yangtse.com/images/2010-06/24/A39/YZA39624C005_b.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>
 
 
 

 

.MainActivity.java
 

package com.example.xianshitupian;  
  

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.Button;  

import android.widget.EditText;  
import android.widget.ImageView;  

import android.widget.Toast;  
  
  
public class MainActivity extends Activity {  

    private ImageView xstp;  
    private EditText xdz;  

    private Button liulan;  
    public static final int SHOWIMAGE=1;  

    public static final int SHOWFAIL=0;  
    private Handler handler=new Handler(){  

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

                case SHOWIMAGE:  
                    Bitmap bitmap=(Bitmap) msg.obj;  

                    xstp.setImageBitmap(bitmap);  
                    break;  

  
  

                case SHOWFAIL:  
                    xstp.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);  
        xstp=(ImageView) findViewById(R.id.ivImage);  

        xdz=(EditText) findViewById(R.id.etdizhi);  
        xstp.setImageResource(R.drawable.button_bg);  

    }  
  

  
    @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 star(View view){  

        final String imageUrl=xdz.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();  

        }  
    }  

}