Android(安卓)通过蓝牙控制小车源代码+视频

《转载自http://hi.baidu.com/liuhuiviking/blog/item/503f2e1feb0e00e3e1fe0b74.html》

上次成功实现了通过笔记本电脑蓝牙来控制智能小车机器人的运动，但是通过电脑控制毕竟不方便，于是乎~本人打算将控制程序移植到手机上。

目前主流的手机操作系统有塞班、安卓（Android）、Windows Mobile，对比了一下，首先，塞班是用C++写的，这么多门语言我唯独看到C++就头大···，放弃了···，Windows Moblie其实和之前发的电脑端程序基本是一样的，也就没什么意思了，最后决定选择目前正火的Android手机作为控制平台。

Android是个开源的应用，使用Java语言对其编程。于是这次的开发我选用Eclipse作为开发工具，用Java语言开发手机端的控制程序，由于之前对Android的蓝牙通信这块涉及不多，一开始感觉有点小茫然，而网上也少有这方面的例程，有少数人做出了类似的东西，但是只传了个视频装X！雪特····

经过几天的研究，最终确定了手机蓝牙通信其实就是Socket编程，在经过一番编写和调试，昨晚终于大功告成！

这是视频地址：

http://player.youku.com/player.php/sid/XMjU4NDMyMDg0/v.swf

下面开始介绍Android手机端控制程序的编写：

首先打开Eclipse，当然之前的Java开发环境和安卓开发工具自己得先配置好，这里就不多说了，网上教程一大摞。

然后新建一个Android项目，修改布局文件main.xml，代码如下：

<?xml version="1.0" encoding="utf-8"?><AbsoluteLayoutandroid:id="@+id/widget0"android:layout_width="fill_parent"android:layout_height="fill_parent"xmlns:android="http://schemas.android.com/apk/res/android"><Buttonandroid:id="@+id/btnF"android:layout_width="100px"android:layout_height="60px"android:text="前进"android:layout_x="130px"android:layout_y="62px"></Button><Buttonandroid:id="@+id/btnL"android:layout_width="100px"android:layout_height="60px"android:text="左转"android:layout_x="20px"android:layout_y="152px"></Button><Buttonandroid:id="@+id/btnR"android:layout_width="100px"android:layout_height="60px"android:text="右转"android:layout_x="240px"android:layout_y="152px"></Button><Buttonandroid:id="@+id/btnB"android:layout_width="100px"android:layout_height="60px"android:text="后退"android:layout_x="130px"android:layout_y="242px"></Button><Buttonandroid:id="@+id/btnS"android:layout_width="100px"android:layout_height="60px"android:text="停止"android:layout_x="130px"android:layout_y="152px"></Button></AbsoluteLayout>

这个布局文件的效果就是如视频中所示的手机操作界面。

然后是权限声明，这一步不能少，否则将无法使用安卓手机的蓝牙功能。

权限声明如下：

打开AndroidManifest.xml文件，修改代码如下：

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"package="com.ThinBTClient.www"android:versionCode="1"android:versionName="1.0"><uses-permission android:name="android.permission.BLUETOOTH_ADMIN" /><uses-permission android:name="android.permission.BLUETOOTH" /><application android:icon="@drawable/icon" android:label="@string/app_name"><activity android:name=".ThinBTClient"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>

其中红色、加粗部分就是要添加的权限声明。

然后编写Activity中的执行代码，这些代码的作用就是发送指令，控制小车的运动。

代码如下：

package com.ThinBTClient.www;import android.app.Activity;import android.os.Bundle;import java.io.IOException;import java.io.OutputStream;import java.util.UUID;import android.app.Activity;import android.bluetooth.BluetoothAdapter;import android.bluetooth.BluetoothDevice;import android.bluetooth.BluetoothSocket;import android.content.DialogInterface;import android.content.DialogInterface.OnClickListener;import android.os.Bundle;import android.provider.ContactsContract.CommonDataKinds.Event;import android.util.Log;import android.view.MotionEvent;import android.view.View;import android.widget.Button;import android.widget.Toast;public class ThinBTClient extends Activity {private static final String TAG = "THINBTCLIENT";private static final boolean D = true;private BluetoothAdapter mBluetoothAdapter = null;private BluetoothSocket btSocket = null;private OutputStream outStream = null;Button mButtonF;Button mButtonB;Button mButtonL;Button mButtonR;Button mButtonS;private static final UUID MY_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");private static String address = "00:11:03:21:00:43"; // <==要连接的蓝牙设备MAC地址/** Called when the activity is first created. */@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);//前进mButtonF=(Button)findViewById(R.id.btnF);mButtonF.setOnTouchListener(new Button.OnTouchListener(){@Overridepublic boolean onTouch(View v, MotionEvent event) {// TODO Auto-generated method stubString message;byte[] msgBuffer;int action = event.getAction();switch(action){case MotionEvent.ACTION_DOWN:try {outStream = btSocket.getOutputStream();} catch (IOException e) {Log.e(TAG, "ON RESUME: Output stream creation failed.", e);}message = "1";msgBuffer = message.getBytes();try {outStream.write(msgBuffer);} catch (IOException e) {Log.e(TAG, "ON RESUME: Exception during write.", e);}break;case MotionEvent.ACTION_UP:try {outStream = btSocket.getOutputStream();} catch (IOException e) {Log.e(TAG, "ON RESUME: Output stream creation failed.", e);}message = "0";msgBuffer = message.getBytes();try {outStream.write(msgBuffer);} catch (IOException e) {Log.e(TAG, "ON RESUME: Exception during write.", e);}break;}return false;}});//后退mButtonB=(Button)findViewById(R.id.btnB);mButtonB.setOnTouchListener(new Button.OnTouchListener(){@Overridepublic boolean onTouch(View v, MotionEvent event) {// TODO Auto-generated method stubString message;byte[] msgBuffer;int action = event.getAction();switch(action){case MotionEvent.ACTION_DOWN:try {outStream = btSocket.getOutputStream();} catch (IOException e) {Log.e(TAG, "ON RESUME: Output stream creation failed.", e);}message = "3";msgBuffer = message.getBytes();try {outStream.write(msgBuffer);} catch (IOException e) {Log.e(TAG, "ON RESUME: Exception during write.", e);}break;case MotionEvent.ACTION_UP:try {outStream = btSocket.getOutputStream();} catch (IOException e) {Log.e(TAG, "ON RESUME: Output stream creation failed.", e);}message = "0";msgBuffer = message.getBytes();try {outStream.write(msgBuffer);} catch (IOException e) {Log.e(TAG, "ON RESUME: Exception during write.", e);}break;}return false;}});//左转mButtonL=(Button)findViewById(R.id.btnL);mButtonL.setOnTouchListener(new Button.OnTouchListener(){@Overridepublic boolean onTouch(View v, MotionEvent event) {// TODO Auto-generated method stubString message;byte[] msgBuffer;int action = event.getAction();switch(action){case MotionEvent.ACTION_DOWN:try {outStream = btSocket.getOutputStream();} catch (IOException e) {Log.e(TAG, "ON RESUME: Output stream creation failed.", e);}message = "2";msgBuffer = message.getBytes();try {outStream.write(msgBuffer);} catch (IOException e) {Log.e(TAG, "ON RESUME: Exception during write.", e);}break;case MotionEvent.ACTION_UP:try {outStream = btSocket.getOutputStream();} catch (IOException e) {Log.e(TAG, "ON RESUME: Output stream creation failed.", e);}message = "0";msgBuffer = message.getBytes();try {outStream.write(msgBuffer);} catch (IOException e) {Log.e(TAG, "ON RESUME: Exception during write.", e);}break;}return false;}});//右转mButtonR=(Button)findViewById(R.id.btnR);mButtonR.setOnTouchListener(new Button.OnTouchListener(){@Overridepublic boolean onTouch(View v, MotionEvent event) {// TODO Auto-generated method stubString message;byte[] msgBuffer;int action = event.getAction();switch(action){case MotionEvent.ACTION_DOWN:try {outStream = btSocket.getOutputStream();} catch (IOException e) {Log.e(TAG, "ON RESUME: Output stream creation failed.", e);}message = "4";msgBuffer = message.getBytes();try {outStream.write(msgBuffer);} catch (IOException e) {Log.e(TAG, "ON RESUME: Exception during write.", e);}break;case MotionEvent.ACTION_UP:try {outStream = btSocket.getOutputStream();} catch (IOException e) {Log.e(TAG, "ON RESUME: Output stream creation failed.", e);}message = "0";msgBuffer = message.getBytes();try {outStream.write(msgBuffer);} catch (IOException e) {Log.e(TAG, "ON RESUME: Exception during write.", e);}break;}return false;}});//停止mButtonS=(Button)findViewById(R.id.btnS);mButtonS.setOnTouchListener(new Button.OnTouchListener(){@Overridepublic boolean onTouch(View v, MotionEvent event) {// TODO Auto-generated method stubif(event.getAction()==MotionEvent.ACTION_DOWN)try {outStream = btSocket.getOutputStream();} catch (IOException e) {Log.e(TAG, "ON RESUME: Output stream creation failed.", e);}String message = "0";byte[] msgBuffer = message.getBytes();try {outStream.write(msgBuffer);} catch (IOException e) {Log.e(TAG, "ON RESUME: Exception during write.", e);}return false;}});if (D)Log.e(TAG, "+++ ON CREATE +++");mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();if (mBluetoothAdapter == null) {Toast.makeText(this, "Bluetooth is not available.", Toast.LENGTH_LONG).show();finish();return;}if (!mBluetoothAdapter.isEnabled()) {Toast.makeText(this, "Please enable your Bluetooth and re-run this program.", Toast.LENGTH_LONG).show();finish();return;}if (D)Log.e(TAG, "+++ DONE IN ON CREATE, GOT LOCAL BT ADAPTER +++");}@Overridepublic void onStart() {super.onStart();if (D) Log.e(TAG, "++ ON START ++");}@Overridepublic void onResume() {super.onResume();if (D) {Log.e(TAG, "+ ON RESUME +");Log.e(TAG, "+ ABOUT TO ATTEMPT CLIENT CONNECT +");}BluetoothDevice device = mBluetoothAdapter.getRemoteDevice(address);try {btSocket = device.createRfcommSocketToServiceRecord(MY_UUID);} catch (IOException e) {Log.e(TAG, "ON RESUME: Socket creation failed.", e);}mBluetoothAdapter.cancelDiscovery();try {btSocket.connect();Log.e(TAG, "ON RESUME: BT connection established, data transfer link open.");} catch (IOException e) {try {btSocket.close();} catch (IOException e2) {Log .e(TAG,"ON RESUME: Unable to close socket during connection failure", e2);}}// Create a data stream so we can talk to server.if (D)Log.e(TAG, "+ ABOUT TO SAY SOMETHING TO SERVER +");/* try {outStream = btSocket.getOutputStream();} catch (IOException e) {Log.e(TAG, "ON RESUME: Output stream creation failed.", e);}String message = "1";byte[] msgBuffer = message.getBytes();try {outStream.write(msgBuffer);} catch (IOException e) {Log.e(TAG, "ON RESUME: Exception during write.", e);}*/}@Overridepublic void onPause() {super.onPause();if (D)Log.e(TAG, "- ON PAUSE -");if (outStream != null) {try {outStream.flush();} catch (IOException e) {Log.e(TAG, "ON PAUSE: Couldn't flush output stream.", e);}}try {btSocket.close();} catch (IOException e2) {Log.e(TAG, "ON PAUSE: Unable to close socket.", e2);}}@Overridepublic void onStop() {super.onStop();if (D)Log.e(TAG, "-- ON STOP --");}@Overridepublic void onDestroy() {super.onDestroy();if (D) Log.e(TAG, "--- ON DESTROY ---");}}

可以看到，在这个程序中我直接把小车蓝牙模块的MAC地址给写进去了，其实更合理一点应该让程序运行后搜索周围蓝牙设备，然后选择需要连接的设备，获取它的MAC地址再连接，但是我为了图省事，就直接把我的小车的蓝牙MAC给定死了（反正也没那么多小车让我遥控~~~），这样一打开程序，手机将自动连接智能小车。

好了，手机端的开发到此介绍完毕~希望能为需要者提供一点帮助。

下一步是打算增加红外避障功能、超声波测距功能，机械手臂，如果有机会，以后再安装上火控系统发射钻天猴~，不过估计时间不太允许了······

再次鄙视光显摆却不肯分享技术的装X党！

由于需要源代码的朋友太多，故贴上源工程的下载地址，各位可以到这里下载：

http://download.csdn.net/source/3242996

如果对编程足够熟悉的话，可以自己建立工程并直接复制本人博客中的代码，效果是一样的。

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