藍芽是一種重要的短距離無線通訊協議，廣泛應用於各種裝置(手機，醫療，汽車等)。藍芽是比較常用的無線通訊裝置，早研究成為手機的標配。現在的安卓手機基本上都有藍芽，所有通過藍芽對資料有很好的硬體基礎

在Android中，與藍芽有關的類和介面在android.bluetooth包中。其中BluetoothAdapter是藍芽中的核心類，代表本地的藍芽介面卡裝置。BluetoothAdapter類讓使用者能執行基本的藍芽任務。例如： 初始化裝置的搜尋，查詢可匹配的裝置集，使用一個已知的MAC地址來初始化一個BluetoothDevice類，建立一個 BluetoothServerSocket類以監聽其它裝置

開啟和掃描藍芽，並將掃面到的藍芽裝置顯示在listview上

BluetoothActivity

package cn.edu.cqu.bluetooth;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.Set;
import com.example.project.R;

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.Window;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

public class BluetoothActivity extends Activity{
	
	private Button button2;
	private ListView list;
	private ArrayAdapter mArrayAdapter;  
	private BluetoothReceiver bluetoothReceiver;
	private BluetoothAdapter bluetoothAdapter;
	private BluetoothDevice device;
	private ArrayList<String> PairedMaclist;
	private TextView textView1;
	int flag;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		this.requestWindowFeature(Window.FEATURE_NO_TITLE);
		super.onCreate(savedInstanceState);
		setContentView(R.layout.bluetooth);
		
		 	
	        list = (ListView)findViewById(R.id.listView);
	        textView1 = (TextView)findViewById(R.id.textView);
	        
	        //建立一個IntentFilter物件，將其action指定為BluetoothDevice.ACTION_FOUND,查詢藍芽
	        IntentFilter intentFileter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
	        bluetoothReceiver = new BluetoothReceiver();
	        //註冊廣播接收器
	        registerReceiver(bluetoothReceiver, intentFileter);
	        bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
	        button2 = (Button)findViewById(R.id.scanButton);
	        button2.setOnClickListener(new ScanButtonListener());
	        list.setOnItemClickListener(new ListViewListener());
	        
	        openBluetooth();
	        
	        mArrayAdapter = new ArrayAdapter(this,android.R.layout.simple_list_item_1);
	        PairedMaclist=new ArrayList<String>();
	       
	}
	
		@Override
	protected void onDestroy() {
		unregisterReceiver(bluetoothReceiver);
		super.onDestroy();
	}

		private void openBluetooth() {
			//bluetoothAdapter.enable();
			if(bluetoothAdapter != null){
				if(!bluetoothAdapter.isEnabled()){
					Intent intent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
					startActivity(intent);
				}
				//得到所有已經被對的藍芽介面卡物件
				Set<BluetoothDevice> devices = bluetoothAdapter.getBondedDevices();
				if(devices.size() > 0){
					for(Iterator<BluetoothDevice> iterator = devices.iterator();iterator.hasNext();){
						BluetoothDevice bluetoothDevice = (BluetoothDevice) iterator.next();
						//得到遠端藍芽裝置的地址
						System.out.println(bluetoothDevice.getAddress());
					}
				}
			}
			else {
				//System.out.println("沒有藍芽裝置");
				Toast.makeText(BluetoothActivity.this, "沒有藍芽裝置",0).show();
			}
		}
		
    class BluetoothReceiver extends BroadcastReceiver{

		@Override
		public void onReceive(Context context, Intent intent) {
			String action = intent.getAction();
			if(BluetoothDevice.ACTION_FOUND.equals(action)){
				//得到intent裡面的資訊
				device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
				Toast.makeText(BluetoothActivity.this, "發現藍芽裝置",0).show();
				//System.out.println(device.getAddress());
				mArrayAdapter.add(device.getName() + "\n" + device.getAddress());
				PairedMaclist.add(device.getAddress());
				list.setAdapter(mArrayAdapter);
			}
		}
    	
    }
    
    class ScanButtonListener implements OnClickListener{

		@Override
		public void onClick(View arg0) {
			mArrayAdapter.clear();
			
			bluetoothAdapter.startDiscovery();
			Toast.makeText(BluetoothActivity.this, "開始掃描",0).show();
		}
    	
    }
    
    class ListViewListener implements OnItemClickListener{

		@Override
		public void onItemClick(AdapterView<?> arg0, View view, int position,
				long id) {
			 String str = PairedMaclist.get(position);
			 //System.out.println("Str-------------" + str);
			 Intent intent = new Intent(BluetoothActivity.this,BluetoothWaveform.class);
			 intent.putExtra("BluetoothMAC",str);
			 startActivity(intent);
		}
    	
    }
}
 

顯示和掃描藍芽佈局檔案

<pre name="code" class="html"><LinearLayout 
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_margin="20dp"
    android:orientation="vertical" >
        
    
    <Button 
        android:id="@+id/scanButton"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="20dp"
        android:text="掃描藍芽裝置"/>
    <TextView 
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="20dp"
        android:textSize="20sp"
        android:text="搜尋到以下裝置："/>
    <ListView 
        android:id="@+id/listView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        ></ListView>
     
</LinearLayout><img src="https://img-blog.csdn.net/20150409144408261?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvY2hlbmZlbmdkZWp1YW5saWFu/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" alt="" />