编写连接ESP8266 WiFi模块WiFi的Android客户端APP安卓程序

一、编写连接ESP8266 WiFi模块（ESP8266-01S芯片）WiFi的Android客户端安卓主程序

package com.example.esp8266androidclient;
import java.io.IOException;
import java.io.PrintStream;
import java.net.Socket;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
  public class ESP8266AndroidClientMainActivity extends ActionBarActivity implements View.OnClickListener
{
   private EditText IP;//IP
   private EditText PORT;//端口号
   private String stringip;//字符串类型IP
   private int stringport;//字符类型端口号
   private Button connect;//连接
   private Socket socket;//套接字
   private PrintStream out;//打印输出流
   private ConnectThread connectthread;//连接线程
   private Button open;//按钮LED灯开
   private Button close;//按钮LED灯关
   @Override
   protected void onCreate(Bundle savedInstanceState) 
 {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_esp8266_android_client_main);
    connect=(Button)findViewById(R.id.button1);
    open=(Button)findViewById(R.id.button2);
    close=(Button)findViewById(R.id.button3);
    IP=(EditText)findViewById(R.id.editextip);
    PORT=(EditText)findViewById(R.id.editextport);
    connect.setOnClickListener(this);
    open.setOnClickListener(this);
    close.setOnClickListener(this);
   }
    @Override
    public void onClick(View v) 
  {
     switch(v.getId())
   {
      case R.id.button1:
                          if( socket == null || ! socket.isConnected()) 
                        {
                           stringip = IP.getText().toString();
                           stringport = Integer.valueOf(PORT.getText().toString());
                           connectthread = new ConnectThread(stringip, stringport);
                           connectthread.start();
                          }
                          if(socket != null && socket.isConnected())
                        {
                           try 
                         {
                            socket.close();
                            socket=null;   //  清空mSocket
                            connect.setText("连接");
                            Toast.makeText(ESP8266AndroidClientMainActivity.this,"连接已关闭", Toast.LENGTH_LONG).show();
                           } 
                           catch (IOException e) 
                         {
                            e.printStackTrace();
                           }
                         }
                          break;
     case R.id.button2:
                         if(out!=null)
                       {
                          out.print("0");
                          out.flush();
                         }
                         break;
     case R.id.button3:
                         if (out!=null)
                       {
                          out.print("1");
                          out.flush();
                         }
                         break;
    }
   }
   private class ConnectThread extends Thread
 {
    private String ip;
    private int port;
    public ConnectThread(String ip,int port){
    this.ip=ip;
    this.port=port;
   }
   @Override
   public void run() 
 {
    try 
  {
     socket=new Socket(ip,port);
     out = new PrintStream(socket.getOutputStream());
     runOnUiThread(new Runnable()
   {
      @Override
      public void run() 
    {
       connect.setText("断开");
       Toast.makeText(ESP8266AndroidClientMainActivity.this,"连接成功",Toast.LENGTH_LONG).show();
      }
     });
    } 
    catch (IOException e) 
  {
     e.printStackTrace();
     runOnUiThread(new Runnable()
   {
      @Override
      public void run() 
    {
       connect.setText("断开");
       Toast.makeText(ESP8266AndroidClientMainActivity.this,"连接失败",Toast.LENGTH_LONG).show();
      }
     });
    }
   }
  }    
 }

二、编写连接ESP8266 WiFi模块（ESP8266-01S芯片）WiFi的Android客户端APP安卓界面布局程序

<RelativeLayout 
  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:orientation="vertical"
  android:paddingBottom="@dimen/activity_vertical_margin"
  android:paddingLeft="@dimen/activity_horizontal_margin"
  android:paddingRight="@dimen/activity_horizontal_margin"
  android:paddingTop="@dimen/activity_vertical_margin"
  tools:context="com.example.esp8266androidclient.ESP8266AndroidClientMainActivity" >
  <LinearLayout
    android:id="@+id/linearLayout1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentLeft="true"
    android:layout_alignParentTop="true" >
    <TextView
      android:id="@+id/textView1"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text="服务器地址："
      android:textSize="20dp" />
    <EditText
      android:id="@+id/editextip"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_weight="1"
      android:ems="10"
      android:hint="ESP8266 WiFi模块WiFi地址号"
      android:inputType="textPersonName" />
   </LinearLayout>
   <LinearLayout
     android:id="@+id/linearLayout2"
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
     android:layout_alignLeft="@+id/linearLayout1"
     android:layout_below="@+id/linearLayout1" >
     <TextView
       android:id="@+id/textView2"
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:text="服务器端口："
       android:textSize="20dp" />
     <EditText
       android:id="@+id/editextport"
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:layout_weight="1"
       android:ems="10"
       android:hint="ESP8266 WiFi模块WiFi端口号"
       android:inputType="textPersonName" />
    </LinearLayout>
    <Button
      android:id="@+id/button1"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:layout_alignLeft="@+id/linearLayout2"
      android:layout_below="@+id/linearLayout2"
      android:layout_marginTop="30dp" 
      android:text="连接"/>
    <Button
      android:id="@+id/button2"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:layout_alignLeft="@+id/button1"
      android:layout_below="@+id/button1"
      android:layout_marginTop="30dp"
      android:text="打开" />
    <Button
      android:id="@+id/button3"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:layout_alignLeft="@+id/button2"
      android:layout_below="@+id/button2"
      android:layout_marginTop="30dp"
      android:text="关闭" />
</RelativeLayout>

三、编写连接ESP8266 WiFi模块（ESP8266-01S芯片）WiFi的Android客户端APP安卓属性权限程序

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
  package="com.example.esp8266androidclient"
  android:versionCode="1"
  android:versionName="1.0" >
  <uses-sdk
    android:minSdkVersion="8"
    android:targetSdkVersion="21" />
  <uses-permission android:name="android.permission.INTERNET"></uses-permission>
  <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>
  <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"></uses-permission>
  <application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <activity
      android:name=".ESP8266AndroidClientMainActivity"
      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>

四、编写连接ESP8266 WiFi模块（ESP8266-01S芯片）WiFi的Android客户端APP字符串资源程序

<?xml version="1.0" encoding="utf-8"?>
<resources>
  <string name="app_name">ESP8266AndroidClient</string>
  <string name="hello_world">Hello world!</string>
  <string name="action_settings">Settings</string>
</resources>

五、连接ESP8266 WiFi模块（ESP8266-01S芯片）WiFi的Android客户端APP界面