一个简单的Android UDP Client

（该代码在4.2.2内调试通过）

1.记得加权限

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

 注意：Android 4.0之后，就不能在主线程进行socket通信，否则会抛异常。

2.代码

MainActivity.java

 1 package mao.example.quicksend;
 2 
 3 
 4 import android.app.Activity;
 5 import android.content.Context;
 6 import android.os.Bundle;
 7 import android.os.Handler;
 8 import android.util.Log;
 9 import android.view.Menu;
10 import android.view.MenuItem;
11 import android.widget.Button;
12 import android.widget.TextView;
13 import android.widget.Toast;
14 import android.view.View;
15 
16 public class MainActivity extends Activity {
17     
18     @Override
19     protected void onCreate(Bundle savedInstanceState) {
20         super.onCreate(savedInstanceState);
21         setContentView(R.layout.activity_main);
22         
23         InitUI();
24         
25         //获得Button对象
26         Button btnConnect = (Button) findViewById(R.id.buttonConnect);
27         btnConnect.setOnClickListener(new Button.OnClickListener() {
28             public void onClick(View v)
29             {
30                 //这里处理事件
31                 
32                 //ConnectServer();
33                 //UDPClient udpET = new UDPClient("192.168.0.14","123");
34                 //udpET.start();
35                 //DisplayToast("点击了\"连接\"按钮");
36             }
37         });
38         
39         //发送Button
40         btnConnect = (Button) findViewById(R.id.buttonSend);
41         btnConnect.setOnClickListener(new Button.OnClickListener() {
42             public void onClick(View v)
43             {
44                 //这里处理事件
45                 SendText();
46             }
47         });
48     }
49 
50     @Override
51     public boolean onCreateOptionsMenu(Menu menu) {
52         // Inflate the menu; this adds items to the action bar if it is present.
53         getMenuInflater().inflate(R.menu.main, menu);
54         return true;
55     }
56 
57     @Override
58     public boolean onOptionsItemSelected(MenuItem item) {
59         // Handle action bar item clicks here. The action bar will
60         // automatically handle clicks on the Home/Up button, so long
61         // as you specify a parent activity in AndroidManifest.xml.
62         int id = item.getItemId();
63         if (id == R.id.action_settings) {
64             return true;
65         }
66         return super.onOptionsItemSelected(item);
67     }
68     
69     /* 显示Toast  */
70     public void DisplayToast(String str)
71     {
72         Toast.makeText(this, str, Toast.LENGTH_SHORT).show();
73     }
74     
75     public void InitUI()
76     {
77         TextView text=(TextView)findViewById(R.id.editTextIP);
78         text.setText("192.168.0.14");
79         
80         text = (TextView)findViewById(R.id.editTextFilePath);
81         text.setText("Udp Client Send Test");
82     }
83     
84     // connect server
85     public void SendText() 
86     {
87         TextView editIP=(TextView)findViewById(R.id.editTextIP);
88         TextView editText=(TextView)findViewById(R.id.editTextFilePath);
89         String message = editText.getText().toString() + "\r\n"; 
90         
91         UDPClient udpET = new UDPClient(editIP.getText().toString(), message);
92         udpET.start();
93     }
94 }

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