android TCP客户端通过socket与服务器通信

一次偶然的机会，接触一个android的项目，目前学习android已经一个月了，项目也已经差不多实现了基本的功能了。

从这个小项目中选择一些自认为比较虐心的，分享一下！

相信大多数刚接触android的爱好者来说都会从网上下载一些电子书学习，socket网络编程的资料也不少，尤其书中提供很多android TCP socket通信的实例，但还是花了一段时间才把这个小问题解决了。

需要注意的是android4.0版本以上者，其socket通信都不能直接放在活动的主线程中，需要另起一个线程进行数据通信；另外，需要获得网络权限<uses-permission android:name="android.permission.INTERNET" />；还有就是要细心加耐心吧！

下面是安卓模拟器的android客户端和计算机服务器通信的demo：

下面是手机客户端通过无线路由和计算机服务器通信的图片：

程序源码：

package com.example.tcpsocketactivity; import java.io.IOException; import java.io.InputStream; import java.io.PrintStream; import java.io.UnsupportedEncodingException; import java.net.InetSocketAddress; import java.net.Socket; import android.app.Activity; import android.content.Context; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.TextView; import android.widget.Toast; public class TCPSocketActivity extends Activity { public static final String TAG = TCPSocketActivity.class.getSimpleName(); /* 服务器地址 */ private String host_ip = null; /* 服务器端口 */ private int host_port = 0; private Button btnConnect; private TextView tev_recv; private Button btnSend; private EditText editSend; private EditText hostIP; private EditText hostPort; private Socket socket; private PrintStream output; private Context context; private InputStream inputStream=null; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.tcp_socket_activity); context = this; initView(); btnConnect.setOnClickListener(new Button.OnClickListener() { @Override public void onClick(View v) { host_ip = hostIP.getText().toString(); host_port = Integer.parseInt(hostPort.getText().toString()); new Thread(new ConnectThread()).start(); } }); btnSend.setOnClickListener(new Button.OnClickListener() { @Override public void onClick(View v) { new Thread(new SendThread(editSend.getText().toString())).start(); } }); } private void toastText(String message) { Toast.makeText(context, message, Toast.LENGTH_LONG).show(); } public void handleException(Exception e, String prefix) { e.printStackTrace(); toastText(prefix + e.toString()); } public void initView() { tev_recv = (TextView)findViewById(R.id.tev_recv); btnConnect = (Button) findViewById(R.id.btnConnect); btnSend = (Button) findViewById(R.id.btnSend); editSend = (EditText) findViewById(R.id.sendMsg); hostIP = (EditText) findViewById(R.id.hostIP); hostPort = (EditText) findViewById(R.id.hostPort); } private void closeSocket() { try { output.close(); socket.close(); } catch (IOException e) { handleException(e, "close exception: "); } } Handler handler = new Handler() { @Override public void handleMessage(Message msg) { super.handleMessage(msg); if (0x123 == msg.what) { toastText("连接成功！"); } } }; /* 连接socket线程 */ public class ConnectThread implements Runnable { @Override public void run() { // TODO Auto-generated method stub Message msg = Message.obtain(); try { if (null == socket || socket.isClosed()) { socket = new Socket(); socket.connect(new InetSocketAddress(host_ip,host_port),5000); output = new PrintStream(socket.getOutputStream(), true, "utf-8"); inputStream = socket.getInputStream(); } msg.what = 0x123; handler.sendMessage(msg); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } byte[] buffer = new byte[1024]; final StringBuilder sb = new StringBuilder(); try { while(true) { int readSize = inputStream.read(buffer); if(readSize > 0) { sb.append(new String(buffer,0,readSize)); runOnUiThread(new Runnable() { public void run() { tev_recv.setText(sb.toString()); } }); } } } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } /*发送信息线程*/ public class SendThread implements Runnable { String msg; public SendThread(String msg) { super(); this.msg = msg; } @Override public void run() { // TODO Auto-generated method stub try { output.print(msg); } catch (Exception e) { e.printStackTrace(); } //closeSocket(); } } } AndroidManifest.xml： <?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.tcpsocketactivity" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="14" android:targetSdkVersion="21" /> <uses-permission android:name="android.permission.INTERNET" /> <application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name=".TCPSocketActivity" 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>

layout代码：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" > <EditText android:id="@+id/hostIP" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_margin="5dip" android:hint="服务器ip" android:singleLine="true" android:inputType="text" android:text="192.168.0.168" /> <EditText android:id="@+id/hostPort" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_margin="5dip" android:hint="端口" android:singleLine="true" android:inputType="number" android:text="8080" /> <Button android:id="@+id/btnConnect" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_gravity="center_vertical|center_horizontal" android:layout_margin="5dip" android:text="connect" /> <TextView android:id="@+id/tev_recv" android:layout_width="fill_parent" android:layout_height="wrap_content" /> <EditText android:id="@+id/sendMsg" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_margin="5dip" android:hint="需要发送的内容" android:inputType="text" android:text="Hello,my name is Client" /> <Button android:id="@+id/btnSend" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_margin="5dip" android:layout_gravity="center_vertical|center_horizontal" android:text="send" /> </LinearLayout>