安卓

MainActivity.java

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1. package com.example.internetimageview;  
2.   
3. import java.io.IOException;  
4. import java.io.InputStream;  
5. import java.net.HttpURLConnection;  
6. import java.net.MalformedURLException;  
7. import java.net.URL;  
8.   
9. import android.app.Activity;  
10. import android.graphics.Bitmap;  
11. import android.graphics.BitmapFactory;  
12. import android.os.Bundle;  
13. import android.os.Handler;  
14. import android.os.Message;  
15. import android.text.TextUtils;  
16. import android.view.Menu;  
17. import android.view.View;  
18. import android.widget.EditText;  
19. import android.widget.ImageView;  
20. import android.widget.Toast;  
21.   
22. public class MainActivity extends Activity {  
23.     private EditText etImageUrl;  
24.     private ImageView ivImage;  
25.     public static final int SHOWIMAGE=1;  
26.     private Handler handler=new Handler(){  
27.         public void handleMessage(android.os.Message msg) {  
28.             switch (msg.what) {  
29.             case SHOWIMAGE:  
30.                 Bitmap bitmap=(Bitmap) msg.obj;  
31.                 ivImage.setImageBitmap(bitmap);  
32.                 break;  
33.   
34.             default:  
35.                 break;  
36.             }  
37.         };  
38.     };  
39.     @Override  
40.     protected void onCreate(Bundle savedInstanceState) {  
41.         super.onCreate(savedInstanceState);  
42.         setContentView(R.layout.activity_main);  
43.         initViews();  
44.     }  
45.   
46.     private void initViews() {  
47.        etImageUrl=(EditText) findViewById(R.id.etImageUrl);  
48.        ivImage=(ImageView) findViewById(R.id.ivImage);  
49.     }  
50.   
51.     @Override  
52.     public boolean onCreateOptionsMenu(Menu menu) {  
53.         // Inflate the menu; this adds items to the action bar if it is present.  
54.         getMenuInflater().inflate(R.menu.main, menu);  
55.         return true;  
56.     }  
57.       
58.     public void viewImage(View view){  
59.         final String imageUrl=etImageUrl.getText().toString();  
60.         if(TextUtils.isEmpty(imageUrl)){  
61.             Toast.makeText(this, "图片路径不能为空", Toast.LENGTH_LONG).show();  
62.         }else{  
63.             new Thread(){  
64.                   
65.                     public void run() {  
66.                         try {  
67.                             URL url=new URL(imageUrl);  
68.                             HttpURLConnection httpURLConnection=(HttpURLConnection) url.openConnection();  
69.                             httpURLConnection.setRequestMethod("GET");  
70.                             httpURLConnection.setConnectTimeout(5000);  
71.                             int responseCode=httpURLConnection.getResponseCode();  
72.                             if(responseCode==200){  
73.                                 InputStream inputStream=httpURLConnection.getInputStream();  
74.                                 Bitmap bitmap=BitmapFactory.decodeStream(inputStream);  
75.                                 Message message=new Message();  
76.                                 message.what=SHOWIMAGE;  
77.                                 message.obj=bitmap;  
78.                                 //ivImage.setImageBitmap(bitmap);  
79.                                 handler.sendMessage(message);  
80.                             }else{  
81.                                 Toast.makeText(MainActivity.this, "显示图片失败", Toast.LENGTH_LONG).show();  
82.                             }  
83.                         } catch (MalformedURLException e) {  
84.                             e.printStackTrace();  
85.                         } catch (IOException e) {  
86.                             e.printStackTrace();  
87.                         }  
88.                       
89.                 }  
90.             }.start();  
91.               
92.         }  
93.     }  
94.   
95. }  

activity_main.xml

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1. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
2.     xmlns:tools="http://schemas.android.com/tools"  
3.     android:layout_width="match_parent"  
4.     android:layout_height="match_parent"  
5.     android:orientation="vertical"  
6.     android:paddingBottom="@dimen/activity_vertical_margin"  
7.     android:paddingLeft="@dimen/activity_horizontal_margin"  
8.     android:paddingRight="@dimen/activity_horizontal_margin"  
9.     android:paddingTop="@dimen/activity_vertical_margin"  
10.     tools:context=".MainActivity" >  
11.   
12.     <ImageView  
13.         android:id="@+id/ivImage"  
14.         android:layout_width="match_parent"  
15.         android:layout_height="wrap_content"  
16.         android:layout_gravity="center"  
17.         android:layout_weight="1" />  
18.   
19.     <EditText  
20.         android:id="@+id/etImageUrl"  
21.         android:layout_width="match_parent"  
22.         android:layout_height="wrap_content"  
23.         android:ems="10"  
24.         android:text="http://photo.fanfou.com/n0/00/x5/dy_28407.jpg"  
25.         android:hint="请输入图片的地址" />  
26.   
27.     <Button  
28.         android:id="@+id/btnView"  
29.         android:layout_width="wrap_content"  
30.         android:layout_height="wrap_content"  
31.         android:layout_gravity="center"  
32.         android:background="@drawable/button_bg"  
33.         android:onClick="viewImage"  
34.         android:text="浏览" />  
35.   
36. </LinearLayout>