Android 基于蓝牙的方向控制器

最近开发了一个蓝牙控制器App，用手机远程控制小球的运动。

包含了一些基础知识：多线程使用，页面UI数据更新，按钮事件，选择项功能，蓝牙功能（蓝牙打开，蓝牙搜索，蓝牙连接，蓝牙命令发送，蓝牙命令接收）。

开发环境为：Android Studio+Java，蓝牙模块HC-06（自发自收模式）。

实现代码

主Activity代码：

 package com.example.cxk.lightballcontroller;

 import android.app.Activity;
 import android.bluetooth.BluetoothAdapter;
 import android.bluetooth.BluetoothDevice;
 import android.bluetooth.BluetoothSocket;
 import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
 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.AdapterView;
 import android.widget.ArrayAdapter;
 import android.widget.Button;
 import android.widget.CompoundButton;
 import android.widget.EditText;
 import android.widget.Spinner;
 import android.widget.Switch;
 import android.widget.TextView;
 import android.widget.Toast;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
 import java.lang.ref.WeakReference;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Set;
 import java.util.UUID;

 public class MainActivity extends Activity {

     private Switch bluetoothSwitch;
     private Button bluetoothSearch;
     private Spinner bluetoothList;
     private Button bluetoothConnect;
     private TextView recvData;
     private EditText sendData;
     private Button bluetoothSend;

     private Button upSend;
     private Button leftSend;
     private Button downSend;
     private Button rightSend;

     private BluetoothAdapter bluetoothAdapter;
     private List<String> list = new ArrayList<String>();
     private ArrayAdapter<String> adapter;
     private String strMacAddress;
     private boolean booleanConnect = false;
     private ConnectedThread connectedThread;
     private MyHandler myHandler = new MyHandler(this);

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);

         bluetoothSwitch = (Switch) findViewById(R.id.swtch);
         bluetoothSearch = (Button) findViewById(R.id.search);
         bluetoothList = (Spinner) findViewById(R.id.list);
         bluetoothConnect = (Button) findViewById(R.id.connect);
         recvData = (TextView) findViewById(R.id.recvdata);
         sendData = (EditText) findViewById(R.id.senddata);
         bluetoothSend = (Button) findViewById(R.id.send);

         upSend = (Button)findViewById(R.id.BtnUp);
         leftSend = (Button)findViewById(R.id.BtnLeft);
         downSend = (Button)findViewById(R.id.BtnDown);
         rightSend = (Button)findViewById(R.id.BtnRight);

         bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
         if(bluetoothAdapter == null){
             //表明此手机不支持蓝牙
             Toast.makeText(MainActivity.this, "未发现蓝牙设备", Toast.LENGTH_SHORT).show();
             return;
         }

         if (bluetoothAdapter.isEnabled()) {
             bluetoothSwitch.setChecked(true);
         }

         adapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item, list);
         adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
         bluetoothList.setAdapter(adapter);

         bluetoothList.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
             @Override
             public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
                 strMacAddress = adapter.getItem(i);
                 adapterView.setVisibility(View.VISIBLE);
             }

             @Override
             public void onNothingSelected(AdapterView<?> adapterView) {

             }
         });

         bluetoothSwitch.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
             @Override
             public void onCheckedChanged(CompoundButton compoundButton, boolean b) {
                 if (b) {
                     if (!bluetoothAdapter.isEnabled()) { //蓝牙未开启，则开启蓝牙
                         Intent enableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
                         startActivity(enableIntent);
                     } else {
                         Toast.makeText(MainActivity.this, "蓝牙已开启", Toast.LENGTH_SHORT).show();
                     }
                 } else {
                     bluetoothAdapter.disable();
                     Toast.makeText(MainActivity.this, "蓝牙已关闭", Toast.LENGTH_SHORT).show();
                 }
             }
         });

         bluetoothSearch.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View view) {
                 if (bluetoothAdapter == null) {
                     Toast.makeText(MainActivity.this, "未发现蓝牙设备", Toast.LENGTH_SHORT).show();
                     return;
                 } else if (!bluetoothAdapter.isEnabled()) {
                     Toast.makeText(MainActivity.this, "蓝牙设备未开启", Toast.LENGTH_SHORT).show();
                 }

                 Set<BluetoothDevice> pairedDevices = bluetoothAdapter.getBondedDevices();
                 if (pairedDevices.size() > 0) {
                     for (BluetoothDevice device : pairedDevices) {
                         adapter.remove(device.getAddress());
                         adapter.add(device.getAddress());
                     }
                 } else {
                     //注册，当一个设备被发现时调用mReceive
                     IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
                     registerReceiver(mReceiver, filter);
                 }
             }
         });

         bluetoothConnect.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View view) {
                 if (strMacAddress == null) {
                     Toast.makeText(MainActivity.this, "请先搜索设备", Toast.LENGTH_SHORT).show();
                 } else {
                     BluetoothDevice device = bluetoothAdapter.getRemoteDevice(strMacAddress);
                     ConnectThread connectThread = new ConnectThread(device);
                     connectThread.start();
                 }
             }
         });

         bluetoothSend.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View view) {
                 if (booleanConnect == false) {
                     Toast.makeText(MainActivity.this, "请先连接设备", Toast.LENGTH_SHORT).show();
                 } else {
                     String strSendData = new String(sendData.getText().toString());
                     connectedThread.write(strSendData.getBytes());
                     sendData.setText("");
                 }
             }
         });

         upSend.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View view) {
                 if (booleanConnect == false) {
                     Toast.makeText(MainActivity.this, "请先连接设备", Toast.LENGTH_SHORT).show();
                 } else {
                     String str = "ONA\n";
                     String strSendData = new String(str);
                     connectedThread.write(strSendData.getBytes());
                     sendData.setText("");
                 }
             }
         });

         downSend.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View view) {
                 if (booleanConnect == false) {
                     Toast.makeText(MainActivity.this, "请先连接设备", Toast.LENGTH_SHORT).show();
                 } else {
                     String str = "ONB\n";
                     String strSendData = new String(str);
                     connectedThread.write(strSendData.getBytes());
                     sendData.setText("");
                 }
             }
         });

         leftSend.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View view) {
                 if (booleanConnect == false) {
                     Toast.makeText(MainActivity.this, "请先连接设备", Toast.LENGTH_SHORT).show();
                 } else {
                     String str = "ONC\n";
                     String strSendData = new String(str);
                     connectedThread.write(strSendData.getBytes());
                     sendData.setText("");
                 }
             }
         });

         rightSend.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View view) {
                 if (booleanConnect == false) {
                     Toast.makeText(MainActivity.this, "请先连接设备", Toast.LENGTH_SHORT).show();
                 } else {
                     String str = "OND\n";
                     String strSendData = new String(str);
                     connectedThread.write(strSendData.getBytes());
                     sendData.setText("");
                 }
             }
         });
     }
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////

     private static class MyHandler extends Handler {
         WeakReference<MainActivity> mActivity;

         MyHandler(MainActivity activity) {
             mActivity = new WeakReference<MainActivity>(activity);
         }

         @Override
         public void handleMessage(Message msg) {
             MainActivity theActivity = mActivity.get();

             theActivity.recvData.append(msg.obj.toString());
         }
     }

     @Override
     protected void onDestroy() {
         if (connectedThread != null) {
             connectedThread.cancel();
         }
         super.onDestroy();
     }

     private BroadcastReceiver mReceiver = new BroadcastReceiver() {
         @Override
         public void onReceive(Context context, Intent intent) {
             String action = intent.getAction();
             if(BluetoothDevice.ACTION_FOUND.equals(action)){
                 BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                 // 已经配对的则跳过
                 if (device.getBondState() != BluetoothDevice.BOND_BONDED) {
                     adapter.add(device.getAddress());
                 }
             }else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)) {  //搜索结束
                 if (adapter.getCount() == 0) {
                     Toast.makeText(MainActivity.this, "没有搜索到设备", Toast.LENGTH_SHORT).show();
                 }
             }
         }
     };

     private class ConnectThread extends Thread{
         private BluetoothSocket mmsocket;
         private BluetoothDevice mmdevice;

         public ConnectThread(BluetoothDevice device){
             mmdevice = device;
             BluetoothSocket tmp = null;
             try {
                 tmp = mmdevice.createRfcommSocketToServiceRecord(UUID.fromString("00001101-0000-1000-8000-00805F9B34FB"));
             } catch (IOException e) {

             }
             mmsocket = tmp;
         }

         public void run(){
             bluetoothAdapter.cancelDiscovery();    //取消设备查找
             try {
                 mmsocket.connect();
             } catch (IOException e) {
                 try {
                     mmsocket.close();
                 } catch (IOException e1) {

                 }
                 //连接失败
                 return;
             }

             booleanConnect = true;
             //新建一个数据交换线程
             connectedThread = new ConnectedThread(mmsocket);
             connectedThread.start();
         }

         public void cancel() {
             try {
                 mmsocket.close();
             } catch (IOException e) {

             }
         }
     }

     private class ConnectedThread extends Thread{
         private BluetoothSocket mmsocket;
         private InputStream inStream;
         private OutputStream outStream;

         public ConnectedThread(BluetoothSocket socket){

             mmsocket = socket;
             try {
                 //获得输入输出流
                 inStream = mmsocket.getInputStream();
                 outStream = mmsocket.getOutputStream();
             } catch (IOException e) {

             }
         }

         public void run(){
             byte[] buff = new byte[1];
             int len = 0;
             //读数据需不断监听，写不需要
             while(true){
                 try {
                     len = inStream.read(buff);
                     //把读取到的数据发送给UI进行显示
                     String strBuffer = new String(buff);

                     Message toMain = myHandler.obtainMessage();
                     toMain.obj = strBuffer;
                     myHandler.sendMessage(toMain);
                 } catch (IOException e) {

                     break;
                 }
             }
         }

         public void write(byte[] buffer) {
             try {
                 outStream.write(buffer);
             } catch (IOException e) {

             }
         }

         public void cancel() {
             try {
                 mmsocket.close();
             } catch (IOException e) {

             }
         }
     }

     @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) {
             super.finish();
             return true;
         }

         return super.onOptionsItemSelected(item);
     }
 }

界面代码：

 <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:orientation="vertical"
     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:weightSum="1">

     <Switch
         android:id="@+id/swtch"
         android:textOn="@string/open"
         android:textOff="@string/close"
         android:layout_width="wrap_content"
         android:layout_height="48dp"
         android:layout_gravity="center_horizontal" />

     <LinearLayout
         android:layout_width="fill_parent"
         android:layout_height="wrap_content"
         android:orientation="horizontal"
         android:weightSum="1">

         <Button
             android:id="@+id/search"
             android:text="@string/search"
             android:layout_width="wrap_content"
             android:layout_height="37dp"
             android:background="#ff9ed7ff" />

         <Spinner
             android:id="@+id/list"
             android:layout_width="162dp"
             android:layout_height="48dp"
             android:layout_weight="1.17" />

         <Button
             android:id="@+id/connect"
             android:text="@string/connect"
             android:layout_width="93dp"
             android:layout_height="38dp"
             android:background="#ff9ed7ff" />
     </LinearLayout>

     <LinearLayout
         android:layout_width="fill_parent"
         android:layout_height="wrap_content"
         android:orientation="horizontal">

     </LinearLayout>

     <RelativeLayout
         android:layout_width="350dp"
         android:layout_height="112dp"
         android:layout_gravity="center_horizontal"
         android:id="@+id/DirectionPanel">

         <Button
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:text="@string/up"
             android:id="@+id/BtnUp"
             android:layout_above="@+id/BtnRight"
             android:layout_centerHorizontal="true"
             android:background="#ffd0e2ff" />

         <Button
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:text="@string/left"
             android:id="@+id/BtnLeft"
             android:layout_alignParentBottom="true"
             android:layout_toLeftOf="@+id/BtnUp"
             android:background="#ffd0e2ff" />

         <Button
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:text="@string/right"
             android:id="@+id/BtnRight"
             android:layout_alignTop="@+id/BtnLeft"
             android:layout_toRightOf="@+id/BtnUp"
             android:background="#ffd0e2ff" />
     </RelativeLayout>

     <Button
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="@string/down"
         android:id="@+id/BtnDown"
         android:layout_alignParentBottom="true"
         android:layout_centerHorizontal="true"
         android:layout_gravity="center_horizontal"
         android:background="#ffd0e2ff" />

     <EditText
         android:id="@+id/senddata"
         android:layout_width="356dp"
         android:layout_height="wrap_content"
         android:layout_weight="0.18" />

     <Button
         android:id="@+id/send"
         android:text="@string/send"
         android:layout_width="84dp"
         android:layout_height="33dp"
         android:background="#ff9ed7ff"
         android:layout_gravity="right" />

     <TextView
         android:text="@string/recv"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content" />

     <ScrollView
         android:layout_width="match_parent"
         android:layout_height="66dp"
         android:id="@+id/scrollView"
         android:layout_weight="0.82"
         android:background="#ffc8c8c8">

         <TextView
             android:id="@+id/recvdata"
             android:layout_width="fill_parent"
             android:layout_height="wrap_content"
             android:layout_weight="0.99"
             android:background="#ffc8c8c8" />
     </ScrollView>

 </LinearLayout>

实现的效果

实现工程代码：蓝牙控制器

参考资料：

http://www.pudn.com/downloads691/sourcecode/comm/android/detail2784484.html