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());     }        } }