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");//沒有用到  BluetoothReceiver receiver;  BluetoothAdapter mBtAdapter;  BluetoothSocket mBtSocket;  private BlueToothTool client;  private ListView mListView;  private List<String> ListDevice;  private ArrayAdapter<String> 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<String>();  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();  }  }  });  }   /**  *開啟藍牙且被發現  */  private void enablebluetooth(){  mBtAdapter=BluetoothAdapter.getDefaultAdapter();   /**  *if(!mBtAdapter.isEnabled()){這里可以先使能，可以在REQUEST_DISCOVERABLE處使能，這樣的話可以連使能和請求被發現一塊完成  // mBtAdapter.enable();  Intent enableIntent=new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);  startActivityForResult(enableIntent,REQUEST_ENABLE);  }  else {  show("藍牙已開啟");  }*/  Intent enable = new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);  enable.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 300);  startActivityForResult(enable, REQUEST_DISCOVERABLE);  }   /**  * 銷毀事件，注銷廣播  */  @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("連接失敗");   try {   client.connect();   } catch (Exception e) {   Log.e("TAG", e.toString());   }   break;  case BlueToothTool.CONNECT_SUCCESS:   show("連接成功");   mListView.setVisibility(View.INVISIBLE);   break;  case BlueToothTool.READ_FAILED:   show("讀取失敗");   break;  case BlueToothTool.WRITE_FAILED:   show("寫入失敗");   break;  case BlueToothTool.DATA:   mstringbuilder.append(msg.obj.toString());   show(mstringbuilder.toString());   break;  }  }  };  /**  * 請求響應結果  * @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("藍牙未開啟");  }  else   show("藍牙已開啟");  break;*/  case REQUEST_DISCOVERABLE:  if(resultCode==Activity.RESULT_CANCELED){   show("藍牙未開啟");  }  else   show("藍牙已開啟");  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;   /**  * 注冊廣播事件  */  @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);  }   /**  * 廣播  */  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)// 防止重復添加   ListDevice.add(str); // 獲取設備名稱和mac地址  if (mAdapter != null) {   mAdapter.notifyDataSetChanged();  }  showDevices();  }  else if(BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)){  progressBar.setVisibility(View.INVISIBLE);  show("已停止尋找");  }   }  };  /**  * 菜單欄點擊事件  * @param item  * @return  */  @Override  public boolean onOptionsItemSelected(MenuItem item) {  switch (item.getItemId()){  case R.id.search:  if(!mBtAdapter.isEnabled()){   show("藍牙未開啟");  }  else {   mBtAdapter.startDiscovery();   show("正在尋找設備");   progressBar.setVisibility(View.VISIBLE);  }  break;  case R.id.about:  Toast.makeText(MainActivity.this,"關于我們",Toast.LENGTH_SHORT).show();  break;  default:  }  return true;  }  private void showDevices() {  mAdapter = new ArrayAdapter<String>(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);  }  });  } }

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;  }  /**  *開辟連接線程任務  */  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(); //連接成功后開啟讀取數據的線程   readtask.start();  } catch (Exception e) {   setState(CONNECT_FAILED);   Log.e("TAG", e.toString());  }  }  });  new Thread(thread).start();  }  /**  *開辟線程讀任務  */  public class Readtask extends Thread{  @Override  public void run(){  byte[] buffer = new byte[1024];  int bytes;  InputStream inputStream ; //建立輸入流讀取數據  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());  }  }  }  }  /**  *開辟線程寫任務  */  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);   }  /**  *下面這個方法目前還沒有用到  */  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;  }  }