我是参考原博客的内容去写的，由于原博客写的不全，少了关键的几个类，然后我就凭借自己扎实的功底补出来了，现在蓝牙工作正常，能发能收！在看这边文章之前你要先了解一下蓝牙的工作状态，我的代码里面可能解释的不是很详细，但是我自己是能看懂的！package com.example.fsl.bluetooth; 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.Handler; import android.os.Message; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.support.v7.widget.Toolbar; import android.util.Log; 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.EditText; import android.widget.ListView; import android.widget.ProgressBar; import android.widget.TextView; import android.widget.Toast; import java.util.ArrayList; import java.util.List; import java.util.UUID; public class MainActivity extends AppCompatActivity { private Toolbar toolbar; private TextView status; private StringBuilder mstringbuilder; private static final UUID MY_UUID=UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");//没有用到 BluetoothReceiver receiver; BluetoothAdapter mBtAdapter; BluetoothSocket mBtSocket; private BlueToothTool client; private ListView mListView; private List ListDevice; private ArrayAdapter mAdapter; private Button mbutton; private EditText editText; private ProgressBar progressBar; private LoopProgressBar loopProgressBar; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); toolbar=(Toolbar)findViewById(R.id.toolbar); status=(TextView)findViewById(R.id.textView2); mListView=(ListView)findViewById(R.id.listView); mbutton=(Button)findViewById(R.id.button); editText=(EditText)findViewById(R.id.editText); progressBar=(ProgressBar)findViewById(R.id.progressBar); progressBar.setVisibility(View.INVISIBLE); loopProgressBar=(LoopProgressBar)findViewById(R.id.loop); ListDevice=new ArrayList(); mstringbuilder=new StringBuilder(); setSupportActionBar(toolbar); enablebluetooth(); mbutton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { BlueToothTool.WriteTask W=client.new WriteTask(editText.getText().toString()); W.start(); } }); mListView.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView parent, View view, int position, long id) { mBtAdapter.cancelDiscovery();//停止搜索 progressBar.setVisibility(View.INVISIBLE); String str = ListDevice.get(position); String macAdress = str.split("\|")[1]; BluetoothDevice device = mBtAdapter.getRemoteDevice(macAdress); client=new BlueToothTool(device,handler); try{ client.connect(); }catch (Exception e){ e.printStackTrace(); } } }); } /** *开启蓝牙且被发现 */ private void enablebluetooth(){ mBtAdapter=BluetoothAdapter.getDefaultAdapter(); /*if(!mBtAdapter.isEnabled()){这里可以先使能，可以在REQUEST_DISCOVERABLE处使能，这样的话可以连使能和请求被发现一块完成 // mBtAdapter.enable(); Intent enableIntent=new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE); startActivityForResult(enableIntent,REQUEST_ENABLE); } else { show("蓝牙已开启"); }*/ Intent enable = new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE); enable.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 300); startActivityForResult(enable, REQUEST_DISCOVERABLE); } /** * 销毁事件，注销广播 */ @Override protected void onDestroy() { unregisterReceiver(receiver); super.onDestroy(); } private final Handler handler = new Handler() { @Override public void handleMessage(Message msg) { switch (msg.what) { case BlueToothTool.CONNECT_FAILED: show("连接失败"); try { client.connect(); } catch (Exception e) { Log.e("TAG", e.toString()); } break; case BlueToothTool.CONNECT_SUCCESS: show("连接成功"); mListView.setVisibility(View.INVISIBLE); break; case BlueToothTool.READ_FAILED: show("读取失败"); break; case BlueToothTool.WRITE_FAILED: show("写入失败"); break; case BlueToothTool.DATA: mstringbuilder.append(msg.obj.toString()); show(mstringbuilder.toString()); break; } } }; /** * 请求响应结果 * @param requestCode * @param resultCode * @param data */ @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { switch (requestCode){ /* case REQUEST_ENABLE: if(requestCode!= Activity.RESULT_OK){ show("蓝牙未开启"); } else show("蓝牙已开启"); break;*/ case REQUEST_DISCOVERABLE: if(resultCode==Activity.RESULT_CANCELED){ show("蓝牙未开启"); } else show("蓝牙已开启"); break; default: break; } } public boolean onCreateOptionsMenu(Menu menu){ getMenuInflater().inflate(R.menu.menu,menu); return true; } private static final int REQUEST_ENABLE=1; private static final int REQUEST_DISCOVERABLE=2; /** * 注册广播事件 */ @Override public void onResume(){ super.onResume(); IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND); receiver = new BluetoothReceiver(); registerReceiver(receiver, filter); filter=new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_FINISHED); registerReceiver(receiver,filter); } /** * 广播 */ private class BluetoothReceiver extends 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); String str = device.getName() + "|" + device.getAddress(); if (ListDevice.indexOf(str) == -1)// 防止重复添加 ListDevice.add(str); // 获取设备名称和mac地址 if (mAdapter != null) { mAdapter.notifyDataSetChanged(); } showDevices(); } else if(BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)){ progressBar.setVisibility(View.INVISIBLE); show("已停止寻找"); } } }; /** * 菜单栏点击事件 * @param item * @return */ @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()){ case R.id.search: if(!mBtAdapter.isEnabled()){ show("蓝牙未开启"); } else { mBtAdapter.startDiscovery(); show("正在寻找设备"); progressBar.setVisibility(View.VISIBLE); } break; case R.id.about: Toast.makeText(MainActivity.this,"关于我们",Toast.LENGTH_SHORT).show(); break; default: } return true; } private void showDevices() { mAdapter = new ArrayAdapter(this, android.R.layout.simple_list_item_1, ListDevice); mListView.setAdapter(mAdapter); } /** * 更新UI方法 * @param string */ private void show(final String string){ runOnUiThread(new Runnable() { @Override public void run() { status.setText(string); } }); } } 然后我的读任务和写任务以及连接任务是在另一个类里面实现的，也就是BlueToothTool类，这个类一个原博客是没有写的，只是MainActivity中用到了这个类的一些方法，但是没有给出，所以就让一些同学很蛋疼。我看完之后是自己补全的这个类！package com.example.fsl.bluetooth; import android.app.Notification; import android.bluetooth.BluetoothDevice; import android.bluetooth.BluetoothSocket; import android.content.Context; import android.os.Handler; import android.os.Message; import android.support.v4.app.NotificationCompat; import android.util.Log; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.lang.reflect.Method; import java.util.logging.LogRecord; /** * Created by Fsl on 2017/12/22. */ public class BlueToothTool { private BluetoothDevice device; private Handler mhandler; BluetoothSocket socket; static final int CONNECT_FAILED=1; static final int CONNECT_SUCCESS=5; static final int READ_FAILED=2; static final int WRITE_FAILED=3; static final int DATA=4; private boolean isConnect=false; public BlueToothTool(BluetoothDevice device,Handler handler){ this.device=device; this.mhandler=handler; } /** *开辟连接线程任务 */ public void connect(){ Thread thread = new Thread(new Runnable() { @Override public void run() { BluetoothSocket tmp = null; Method method; try { method = device.getClass().getMethod("createRfcommSocket", new Class[]{int.class}); tmp = (BluetoothSocket) method.invoke(device, 1); } catch (Exception e) { setState(CONNECT_FAILED); Log.e("TAG", e.toString()); } socket = tmp; try { socket.connect(); isConnect = true; setState(CONNECT_SUCCESS); Readtask readtask = new Readtask(); //连接成功后开启读取数据的线程 readtask.start(); } catch (Exception e) { setState(CONNECT_FAILED); Log.e("TAG", e.toString()); } } }); new Thread(thread).start(); } /** *开辟线程读任务 */ public class Readtask extends Thread{ @Override public void run(){ byte[] buffer = new byte[1024]; int bytes; InputStream inputStream ; //建立输入流读取数据 while (true) { try { inputStream = socket.getInputStream(); if ((bytes = inputStream.read(buffer)) > 0) { byte[] buf_data= new byte[bytes]; for (int i = 0; i < bytes; i++) { buf_data[i] = buffer[i]; } String s = new String(buf_data); Message msg = mhandler.obtainMessage(); msg.what = DATA; msg.obj = s; mhandler.sendMessage(msg); } } catch (IOException e) { setState(READ_FAILED); Log.e("TAG", e.toString()); break; } } if (socket != null) { try { socket.close(); } catch (IOException e) { Log.e("TAG", e.toString()); } } } } /** *开辟线程写任务 */ public class WriteTask extends Thread{ private String srt; public WriteTask(String str){ this.srt=str; } @Override public void run(){ OutputStream outputStream=null; byte[] st=srt.getBytes(); try{ outputStream=socket.getOutputStream(); outputStream.write(st); }catch (Exception e){ setState(WRITE_FAILED); e.printStackTrace(); } } } private void setState(int mes){ Message message=new Message(); message.what=mes; mhandler.sendMessage(message); } /** *下面这个方法目前还没有用到 */ private byte[] getHexBytes(String message) { int len = message.length() / 2; char[] chars = message.toCharArray(); String[] hexStr = new String[len]; byte[] bytes = new byte[len]; for (int i = 0, j = 0; j < len; i += 2, j++) { hexStr[j] = "" + chars[i] + chars[i + 1]; bytes[j] = (byte) Integer.parseInt(hexStr[j], 16); } return bytes; } }         以上就是我的蓝牙与单片机连接通信的全过程，顺便说一下，这个连接是自动连接的，不需要什么秘钥什么的，直接搜索到HC-05蓝牙直接就可以确定连接，亲测有效。我这个程序自己写了两遍，第一遍的时候由于我的硬盘坏了，结果修了一个星期大费周折都没有修好，4年的东西全都没有了，当然也包括这个项目，在这里提醒一下大家，在工作的时候要有备份重要数据的习惯！！真他妈日了狗了！最终当然选择坦然面对啊，一切从头开始，硬盘坏之后，我那几天的感觉就是——我两手空空，除了我的脑子，关于一切记忆都没有了，只剩下我的脑子了，20多年来的同学照片，视频，家人照片，和女朋友的记忆，我做的课题与项目，所有的一切都没有了，只剩下我的脑子能回忆了！相当惨！    最后我又把自己之前做到一半的项目凭借仅有的记忆重新写了一遍！很惨！