android实现局域网聊天 - UDP实现下载_course

android实现局域网聊天 - UDP实现 相关下载链接：//download.csdn.net/download/wduj123/9508473?utm_source=bbsseo

android基于局域网的UDP传输下载_course

本项目实现了一个在android 创建的局域网下的UDP发送消息，接收消息，操作流程：首先开启WIFI热点，第二部手机连接热点，在启动udpserver，这时即可发送和接收udp数据 相关下载链接：/

关于Android利用局域网进行UDP通信的问题_course

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"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.company.zebork.testudpll" > <uses-permission android:name="android.permission.INTERNET"/> <uses-permission android:name="android.permission.CHANGE_NETWORK_STATE"/> <uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/> <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/> <uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/> <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> </manifest> 4、activity_main.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: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" /> </LinearLayout> 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(); } } } }

Android studio最简单的局域网通信_course

在MyEclipse中写了几行程序，仅用于往UDP端口发一段文字，程序调试通过，通信也正常。 但把这段程序移植到Android studio中就寸步难行，去掉所有代码，只留了个声明，在手机上依旧闪退，