<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  android:layout_width="fill_parent"  android:layout_height="fill_parent" android:orientation="vertical"> <TextView android:id="@+id/textView1" android:layout_width="wrap_content" android:text="TextView" android:layout_height="wrap_content"></TextView>  <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/linearLayout1">   <Button android:id="@+id/button1" android:text="OFF" android:layout_width="wrap_content" android:layout_height="wrap_content"></Button>  </LinearLayout>  <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/linearLayout2">   <Button android:id="@+id/button2" android:text="開啟可見 " android:layout_width="wrap_content" android:layout_height="wrap_content"></Button>   <TextView android:id="@+id/textView2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="設備不可見 "></TextView>  </LinearLayout>  <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/linearLayout3">   <Button android:id="@+id/button3" android:text="掃描:OFF" android:layout_width="wrap_content" android:layout_height="wrap_content"></Button>   <TextView android:id="@+id/textView3" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="停止掃描 "></TextView>  </LinearLayout>  <ListView android:id="@+id/listView1" android:layout_height="wrap_content" android:layout_width="match_parent"></ListView> </LinearLayout>

package com.test_bluetooth; import java.util.Set; import android.app.Activity; import android.bluetooth.BluetoothAdapter; import android.bluetooth.BluetoothDevice; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.os.Bundle; import android.os.CountDownTimer; import android.view.View; import android.widget.ArrayAdapter; import android.widget.Button; import android.widget.ListView; import android.widget.TextView; public class test_bluetooth extends Activity implements View.OnClickListener {  private static final int REQUEST_ENABLE_BT = 2;  TextView txt;  TextView txt_see;  TextView txt_scan;  BluetoothAdapter mBluetoothAdapter;  ArrayAdapter<String> mArrayAdapter;  Button btn_switch;  Button btn_see;  Button btn_scan;  ListView list;  CountDownTimer see_timer;  CountDownTimer scan_timer;  /** Called when the activity is first created. */  @Override  public void onCreate(Bundle savedInstanceState)  {   super.onCreate(savedInstanceState);   setContentView(R.layout.main);   txt = (TextView)findViewById(R.id.textView1);   txt_see = (TextView)findViewById(R.id.textView2);   txt_scan = (TextView)findViewById(R.id.textView3);   //綁定XML中的ListView，作為Item的容器   list = (ListView) findViewById(R.id.listView1);   //獲取藍牙適配器   mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();   mArrayAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1);  if (mBluetoothAdapter == null)   {    // Device does not support Bluetooth    txt.setText("fail");    //退出程序    test_bluetooth.this.finish();   }   btn_switch = (Button)findViewById(R.id.button1);   btn_switch.setOnClickListener(this);   btn_see = (Button)findViewById(R.id.button2);   btn_see.setOnClickListener(this);   btn_see.setEnabled(false);    btn_scan = (Button)findViewById(R.id.button3);   btn_scan.setOnClickListener(this);   btn_scan.setText("掃描:OFF");   btn_scan.setEnabled(false);   //判斷藍牙是否已經被打開   if (mBluetoothAdapter.isEnabled())   {    //打開    btn_switch.setText("ON");    btn_see.setEnabled(true);    btn_scan.setEnabled(true);   }   see_timer = new CountDownTimer(120000,1000)   {    @Override    public void onTick( long millisUntilFinished)    {     txt_see.setText( "剩余可見時間" + millisUntilFinished / 1000 + "秒");    }      @Override    public void onFinish()    {     //判斷藍牙是否已經被打開     if (mBluetoothAdapter.isEnabled())     {      btn_see.setEnabled(true);      txt_see.setText( "設備不可見");     }    }   };   scan_timer = new CountDownTimer(12000,1000)   {    @Override    public void onTick( long millisUntilFinished)    {     txt_scan.setText( "剩余掃描時間" + millisUntilFinished / 1000 + "秒");    }      @Override    public void onFinish()    {     //判斷藍牙是否已經被打開     if (mBluetoothAdapter.isEnabled())     {      btn_scan.setEnabled(true);      //關閉掃描      mBluetoothAdapter.cancelDiscovery();      btn_scan.setText("掃描:OFF");      txt_scan.setText( "停止掃描");     }    }   };  }  @Override  protected void onDestroy() {   super.onDestroy();   android.os.Process.killProcess(android.os.Process.myPid());  }  @Override  public void onClick(View v)  {   // TODO Auto-generated method stub   switch (v.getId())   {   case R.id.button1:    {     String str = btn_switch.getText().toString();     if (str == "OFF")     {      if (!mBluetoothAdapter.isEnabled())      {       //打開藍牙       Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);       startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);       txt.setText("s1");       btn_see.setEnabled(true);       btn_scan.setText("掃描:OFF");       btn_scan.setEnabled(true);      }     }     else     {      //關閉藍牙      mBluetoothAdapter.disable();      btn_switch.setText("OFF");      mArrayAdapter.clear();      list.setAdapter(mArrayAdapter);      btn_see.setEnabled(false);      btn_scan.setEnabled(false);     }     break;    }   case R.id.button2:   {    //開啟可見    Intent enableBtIntent_See = new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);    startActivityForResult(enableBtIntent_See, 3);    txt.setText("s1");    btn_see.setEnabled(false);    see_timer.start();    break;   }   case R.id.button3:   {    String str = btn_scan.getText().toString();    if (str == "掃描:OFF")    {     txt.setText("s5");     if (mBluetoothAdapter.isEnabled())     {      //開始掃描      mBluetoothAdapter.startDiscovery();      txt.setText("s6");      btn_scan.setText("掃描:ON");      // Create a BroadcastReceiver for ACTION_FOUND      final BroadcastReceiver mReceiver = new BroadcastReceiver()      {       @Override       public void onReceive(Context context, Intent intent)       {        // TODO Auto-generated method stub        String action = intent.getAction();        // When discovery finds a device        mArrayAdapter.clear();        if (BluetoothDevice.ACTION_FOUND.equals(action))        {         // Get the BluetoothDevice object from the Intent         BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);         // Add the name and address to an array adapter to show in a ListView         mArrayAdapter.add(device.getName() + ":" + device.getAddress());        }        list.setAdapter(mArrayAdapter);       }      };      // Register the BroadcastReceiver      IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);      registerReceiver(mReceiver, filter); // Don't forget to unregister during onDestroy      scan_timer.start();     }    }    else    {     //關閉掃描     mBluetoothAdapter.cancelDiscovery();     btn_scan.setText("掃描:OFF");     scan_timer.cancel();     txt_scan.setText( "停止掃描");    }    break;   }   default:    break;   }  }  public void onActivityResult(int requestCode, int resultCode, Intent data)  {   switch (requestCode)   {   case REQUEST_ENABLE_BT:    // When the request to enable Bluetooth returns    if (resultCode == Activity.RESULT_OK)    {     // Bluetooth is now enabled, so set up a chat session     btn_switch.setText("ON");     txt.setText("s4");     //獲取藍牙列表     Set<BluetoothDevice> pairedDevices = mBluetoothAdapter.getBondedDevices();     mArrayAdapter.clear();     // If there are paired devices     if (pairedDevices.size() > 0)     {      //txt.setText("s3");      // Loop through paired devices      for (BluetoothDevice device : pairedDevices)      {       // Add the name and address to an array adapter to show in a ListView       mArrayAdapter.add(device.getName() + ":" + device.getAddress());      }      list.setAdapter(mArrayAdapter);      }    } else    {     finish();    }   }  } }