Android 網路圖片查看器與網頁源碼查看器

在AndroidManifest.xml裡面先添加訪問網路的許可權：

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

效果圖如下：

下麵是主要代碼：

 1 package com.hb.neting;
 2 
 3 import java.io.InputStream;
 4 import java.net.HttpURLConnection;
 5 import java.net.URL;
 6 
 7 import android.annotation.SuppressLint;
 8 import android.app.Activity;
 9 import android.graphics.Bitmap;
10 import android.graphics.BitmapFactory;
11 import android.os.Bundle;
12 import android.text.TextUtils;
13 import android.view.View;
14 import android.widget.EditText;
15 import android.widget.ImageView;
16 import android.widget.Toast;
17 
18 public class MainActivity extends Activity {
19     private ImageView iv_show;
20     private EditText et_input;
21     private String path;
22     private int code;
23     private HttpURLConnection conn;
24     @Override
25     protected void onCreate(Bundle savedInstanceState) {
26         super.onCreate(savedInstanceState);
27         setContentView(R.layout.activity_main);
28         iv_show=(ImageView) findViewById(R.id.iv_show);
29         et_input=(EditText) findViewById(R.id.et_inpput);
30     }
31     @SuppressLint("ShowToast") public void chakan(View view){
32         path = et_input.getText().toString().trim();
33         if (TextUtils.isEmpty(path)) {
34             Toast.makeText(MainActivity.this, "不能輸入空的", 0).show();
35             return;
36         }
37         new Thread(){
38             public void run() {
39                 try {
40                     URL url = new URL(path);
41                     conn = (HttpURLConnection) url.openConnection();
42                     conn.setRequestMethod("GET");
43                     conn.setConnectTimeout(5000);
44                     code = conn.getResponseCode();
45                     if(code==200){
46                         InputStream in = conn.getInputStream();
47                         //解析圖片
48                         final Bitmap stream = BitmapFactory.decodeStream(in);
49                         runOnUiThread(new  Runnable() {
50                             public void run() {
51                                 //更新UI
52                                 iv_show.setImageBitmap(stream);
53                             }
54                         });
55                         in.close();
56                     }
57                 } catch (Exception e) {
58                     e.printStackTrace();
59                 }
60             };
61         }.start();
62     }
63 }

這是xml的佈局：

 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 
 7     <EditText
 8         android:id="@+id/et_inpput"
 9         android:layout_width="match_parent"
10         android:layout_height="wrap_content"
11         android:hint="請輸入獲取圖片的地址：" />
12     <Button 
13         android:id="@+id/bt_read"
14         android:onClick="chakan"
15         android:layout_width="match_parent"
16         android:layout_height="wrap_content"
17         android:text="查看"
18         />
19     <ImageView
20         android:id="@+id/iv_show"
21         android:layout_width="match_parent"
22         android:layout_height="match_parent"
23         />
24 </LinearLayout>

源碼：http://pan.baidu.com/s/1bUgMgY

接著看一下網頁源碼查看器的小案例：

　　既然都涉及到網路的添加一個如上的網路許可權是必不可少的了，具體操做如上所示，先看效果圖：

主要代碼：

 1 package com.hb.network;
 2 
 3 import java.io.InputStream;
 4 import java.net.HttpURLConnection;
 5 import java.net.URL;
 6 
 7 import android.annotation.SuppressLint;
 8 import android.app.Activity;
 9 import android.os.Bundle;
10 import android.os.Handler;
11 import android.os.Message;
12 import android.text.TextUtils;
13 import android.view.View;
14 import android.widget.EditText;
15 import android.widget.TextView;
16 import android.widget.Toast;
17 
18 import com.hb.utils.ReadStreamUtils;
19 
20 public class MainActivity extends Activity {
21     protected static final int SUCESS = 0;
22     protected static final int EORR = 1;
23     private TextView tv_show; 
24     private EditText et_input;
25     private URL url;
26     private String path;
27     @SuppressLint("HandlerLeak") 
28     private Handler handler=new Handler(){
29         public void handleMessage(android.os.Message msg) {
30             switch (msg.what) {
31             case SUCESS:
32                 String content=(String) msg.obj;
33                 tv_show.setText(content);
34                 break;
35 
36             case EORR:
37                 Toast.makeText(MainActivity.this,"查看源碼失敗" , 0).show();
38                 break;
39             }
40         };
41     };
42     @Override
43     protected void onCreate(Bundle savedInstanceState) {
44         super.onCreate(savedInstanceState);
45         setContentView(R.layout.activity_main);
46         tv_show=(TextView) findViewById(R.id.tv_show);
47         et_input=(EditText) findViewById(R.id.et_input);
48 
49 
50     }
51     public void onclick(View view){
52         path = et_input.getText().toString().trim();
53         if(TextUtils.isEmpty(path)){
54             return;
55         }new Thread(){
56             public void run() {
57                 try {
58                     url = new URL(path);
59                     //判斷從EditText獲取的數據否為空
60                     if(TextUtils.isEmpty(path)){
61                         return;
62                     }
63                     HttpURLConnection conn = (HttpURLConnection) url.openConnection();
64                     conn.setConnectTimeout(3000);
65                     conn.setRequestMethod("GET");
66                     int code = conn.getResponseCode();
67                     if(code == 200){
68                         InputStream is= conn.getInputStream();
69                         String content = ReadStreamUtils.Read(is);
70                         Message msg = new Message();
71                         msg.what=SUCESS;
72                         msg.obj=content;
73                         handler.sendMessage(msg);
74                     }
75                 } catch (Exception e) {
76                     e.printStackTrace();
77                     Message msg = new Message();
78                     msg.what=EORR;
79                     handler.sendMessage(msg);
80                 }
81             };
82         }.start();
83 
84     }
85 }

 1 package com.hb.utils;
 2 
 3 import java.io.ByteArrayOutputStream;
 4 import java.io.IOException;
 5 import java.io.InputStream;
 6 
 7 public class ReadStreamUtils {
 8 /**
 9  * 讀取流的輸入
10  * @param is
11  * @return
12  * @throws IOException
13  */
14     public static String Read(InputStream is) throws IOException{
15         ByteArrayOutputStream bos = new ByteArrayOutputStream();
16         int len;
17         byte [] buffer=new byte[1024];
18         while((len=is.read(buffer))!=-1){
19             bos.write(buffer,0,len);
20         }
21         is.close();
22         bos.close();
23         String temp = bos.toString();
24         if(temp.contains("charset=utf-8")){
25             return bos.toString("utf-8");
26         }else if(temp.contains("charset=iso-8859-1")){
27             return bos.toString("iso-8859-1");
28         }
29         return null;
30         
31     }
32 
33 }

及xml佈局:

 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     tools:context="${relativePackage}.${activityClass}" >
 7 
 8     <EditText
 9         android:id="@+id/et_input"
10         android:layout_width="match_parent"
11         android:layout_height="wrap_content"
12         android:hint="請輸入要查看源碼的網址：" />
13 
14     <Button
15         android:onClick="onclick"
16         android:layout_width="match_parent"
17         android:layout_height="wrap_content"
18         android:text="查看"
19         android:textSize="25sp" />
20 
21     <ScrollView
22         android:layout_width="match_parent"
23         android:layout_height="match_parent" >
24 
25         <TextView
26             android:id="@+id/tv_show"
27             android:layout_width="match_parent"
28             android:layout_height="match_parent" />
29     </ScrollView>
30 
31 </LinearLayout>

　　源碼：http://pan.baidu.com/s/1bUgMgY

　　　　　http://pan.baidu.com/s/1i46RQqL