我写了一个小程序准备利用UDP和电脑之间进行通信，然后基于这个做一点东西，可是问题是我用AVD测试很好用的，但是用真机测试就是不行。
我的思路是让电脑和Android设备连接一台路由器，路由器为两台设备分配固定的ip地址进行通信。
拜托大家帮我看看啊，我这才是第一步就郁闷的要死
下面是代码。
1：MainActivity
package com.company.zebork.testudpll;
import android.app.Activity;
import android.content.Context;
import android.net.wifi.WifiManager;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
public class MainActivity extends Activity {
EditText text;
Button send;
Handler handler;
Message msg;
EditText ad;
String address;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
text = (EditText) findViewById(R.id.editText);
send = (Button) findViewById(R.id.send);
ad = (EditText) findViewById(R.id.editText2);
handler = new Handler() {
@Override
public void handleMessage(Message msg) {
text.setText("");
}
};
/* send.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
handler.handleMessage(msg);
}
});*/
send.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
System.out.println(ad.getText().toString());
AsyncTask<String ,String , Void> toSend = new AsyncTask<String, String, Void>() {
@Override
protected Void doInBackground(String... params) {
address = ad.getText().toString();
UDPClient client = new UDPClient(address);
System.out.println("here" + address);
client.send(text.getText().toString());
msg = new Message();
handler.sendMessage(msg);
return null;
}
@Override
protected void onPostExecute(Void aVoid) {
super.onPostExecute(aVoid);
}
}.execute(address);
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
2、UDPClient
package com.company.zebork.testudpll;
import java.io.IOException;
import java.net.*;
public class UDPClient {
private DatagramPacket dp;
private DatagramSocket ds;
private byte[] buf;
private String address;
public UDPClient(String address) {
buf = new byte[4096];
this.address = address;
System.out.println("??" + address);
try {
ds = new DatagramSocket(8888);
} catch (SocketException e) {
e.printStackTrace();
}
}
public void send(String str) {
buf = str.getBytes();
try {
dp = new DatagramPacket(buf, buf.length,new InetSocketAddress(address,5679));
ds.send(dp);
ds.close();
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (SocketException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}
3、AndroidManifest【有些权限我都没有用到，因为调试这个错误才加上的】
<?xml version="1.0" encoding="utf-8"?>
package="com.company.zebork.testudpll" >
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
4、activity_main.xml
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity"
android:orientation="vertical">
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/editText"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true" />
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/editText2"
android:layout_gravity="center_horizontal"
android:text="ip" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="发送"
android:id="@+id/send"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true"
android:layout_gravity="center_horizontal" />
5、服务器的Java文件，我是用JavaSE写的，因为不会javaEE
import java.io.IOException;
import java.net.*;
import java.awt.*;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
public class TestUDPClient extends Frame{
private static DatagramPacket dp;
private static DatagramSocket ds;
private static TextField text;
private static TextArea ta;
public static void main(String[] args) {
Frame f = new TestUDPClient();
f.setLocation(200, 200);
f.setSize(300,200);
f.setVisible(true);
text = new TextField();
ta = new TextArea();
f.add(text,BorderLayout.SOUTH);
f.add(ta,BorderLayout.CENTER);
f.addWindowListener(new WindowAdapter() {
@Override
public void windowClosing(WindowEvent e) {
if(ds!=null)
ds.close();
System.exit(0);
}
});
startServer();
}
public static void startServer() {
byte[] buf = new byte[4096];
dp = new DatagramPacket(buf,buf.length);
try {
ds = new DatagramSocket(5679);
} catch (SocketException e) {
e.printStackTrace();
}
while(true) {
try {
ds.receive(dp);
if(ta.getText().length() > 0)
ta.setText(ta.getText() + "\n" + new String(buf,0,dp.getLength()));
else
ta.setText(new String(buf,0,dp.getLength()));
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
先看是否分配到合法IP，然后就是建立连接是否成功