Android 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：
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：
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. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//前进
mButtonF=(Button)findViewById(R.id.btnF);
mButtonF.setOnTouchListener(new Button.OnTouchListener(){
@Override
public boolean onTouch(View v, MotionEvent event) {
// TODO Auto-generated method stub
String 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(){
@Override
public boolean onTouch(View v, MotionEvent event) {
// TODO Auto-generated method stub
String 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(){
@Override
public boolean onTouch(View v, MotionEvent event) {
// TODO Auto-generated method stub
String 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(){
@Override
public boolean onTouch(View v, MotionEvent event) {
// TODO Auto-generated method stub
String 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(){
@Override
public boolean onTouch(View v, MotionEvent event) {
// TODO Auto-generated method stub
if(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 +++");
}
@Override
public void onStart() {
super.onStart();
if (D) Log.e(TAG, "++ ON START ++");
}
@Override
public 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);
}
*/
}
@Override
public 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);
}
}
@Override
public void onStop() {
super.onStop();
if (D)Log.e(TAG, "-- ON STOP --");
}
@Override
public 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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