Android开发中编写蓝牙相关功能的核心代码讲解

MainActivity:

import java.util.Iterator; 
import java.util.Set; 
 
import android.app.Activity; 
import android.bluetooth.BluetoothAdapter; 
import android.bluetooth.BluetoothDevice; 
import android.content.Intent; 
import android.os.Bundle; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.widget.Button; 
 
public class MainActivity extends Activity { 
  private Button button = null; 
  /** Called when the activity is first created. */ 
  @Override 
  public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 
     
    button = (Button)findViewById(R.id.buttonId); 
    button.setOnClickListener(new OnClickListener(){ 
 
      @Override 
      public void onClick(View v) { 
        //获得BluetoothAdapter对象，该API是android 2.0开始支持的 
        BluetoothAdapter adapter = BluetoothAdapter.getDefaultAdapter(); 
        //adapter不等于null，说明本机有蓝牙设备 
        if(adapter != null){ 
          System.out.println("本机有蓝牙设备！"); 
          //如果蓝牙设备未开启 
          if(!adapter.isEnabled()){ 
            Intent intent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE); 
            //请求开启蓝牙设备 
            startActivity(intent); 
          } 
          //获得已配对的远程蓝牙设备的集合 
          Set<BluetoothDevice> devices = adapter.getBondedDevices(); 
          if(devices.size()>0){ 
            for(Iterator<BluetoothDevice> it = devices.iterator();it.hasNext();){ 
              BluetoothDevice device = (BluetoothDevice)it.next(); 
              //打印出远程蓝牙设备的物理地址 
              System.out.println(device.getAddress()); 
            } 
          }else{ 
            System.out.println("还没有已配对的远程蓝牙设备！"); 
          } 
        }else{ 
          System.out.println("本机没有蓝牙设备！"); 
        } 
      } 
    }); 
  } 
} 

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
   package="com.se7en" 
   android:versionCode="1" 
   android:versionName="1.0"> 
  <uses-sdk android:minSdkVersion="8" /> 
 
  <application android:icon="@drawable/icon" android:label="@string/app_name"> 
    <activity android:name=".MainActivity" 
         android:label="@string/app_name"> 
      <intent-filter> 
        <action android:name="android.intent.action.MAIN" /> 
        <category android:name="android.intent.category.LAUNCHER" /> 
      </intent-filter> 
    </activity> 
  </application> 
  <uses-permission android:name="android.permission.BLUETOOTH"/> 
   
  <!-若需要管理蓝牙设备，如修改可见性，则需以下的权限-> 
  <uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/> 
</manifest> 

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
  android:orientation="vertical" 
  android:layout_width="fill_parent" 
  android:layout_height="fill_parent" 
  > 
  <TextView  
    android:layout_width="fill_parent"  
    android:layout_height="wrap_content"  
    android:text="@string/hello" 
    /> 
  <Button  
    android:id="@+id/discoverButton" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="设置可见性"/> 
  <Button  
    android:id="@+id/scanButton" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="开始扫描"/> 
</LinearLayout> 

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.view.View; 
import android.view.View.OnClickListener; 
import android.widget.Button; 
 
public class MainActivity extends Activity { 
  private Button discoverButton = null; 
  private Button scanButton = null; 
  private BluetoothAdapter adapter = null; 
  private BluetoothReceiver bluetoothReceiver = null; 
  /** Called when the activity is first created. */ 
  @Override 
  public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 
     
    adapter = BluetoothAdapter.getDefaultAdapter(); 
     
    discoverButton = (Button)findViewById(R.id.discoverButton); 
    scanButton = (Button)findViewById(R.id.scanButton); 
    //修改蓝牙设备的可见性 
    discoverButton.setOnClickListener(new OnClickListener(){ 
      @Override 
      public void onClick(View view) { 
      Intent discoverIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE); 
 
//设置蓝牙可见性，500表示可见时间（单位：秒），当值大于300时默认为300 
discoverIntent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION,500); 
startActivity(discoverIntent); 
      } 
    }); 
     
    scanButton.setOnClickListener(new OnClickListener(){ 
      @Override 
      public void onClick(View v) { 
    //开始扫描周围蓝牙设备，该方法是异步调用并以广播的机制返回，所以需要创建一个BroadcastReceiver来获取信息 
        adapter.startDiscovery(); 
      } 
    }); 
     
    //设定广播接收的filter 
    IntentFilter intentFilter = new IntentFilter(BluetoothDevice.ACTION_FOUND); 
    //创建蓝牙广播信息的receiver 
    bluetoothReceiver = new BluetoothReceiver (); 
    //注册广播接收器 
    registerReceiver(bluetoothReceiver,intentFilter); 
       
  } 
   
  private class BluetoothReceiver extends BroadcastReceiver{ 
    @Override 
    public void onReceive(Context context, Intent intent) { 
      //获得扫描到的远程蓝牙设备 
      BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE); 
      System.out.println(device.getAddress()); 
    } 
     
  } 
}