蓝牙Demo2

1.首先看布局，很简单，就有两个按钮，用于设置监听事件

<?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" >

    <Button
        android:id="@+id/discoverbutton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="设置蓝牙的可见性" />

    <Button
        android:id="@+id/scannbutton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="开始扫描蓝牙设备" />

</LinearLayout>

2.接着看看实现的活动类

package com.wang;

import java.util.Iterator;
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.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class BluetoothActivity extends Activity {
	private BluetoothAdapter bluetoothAdapter;
	private Button scannbutton;
	private Button discoverbutton;
	private BluetoothReceiver bluetoothReceiver = null;

	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		// 创建一个对象IntentFilter 过滤是否发线蓝牙设备
		IntentFilter intentFilter = new IntentFilter(
				BluetoothDevice.ACTION_FOUND);
		bluetoothReceiver = new BluetoothReceiver();
		// 注册一个广播接收器，
		registerReceiver(bluetoothReceiver, intentFilter);
		// 得到默认是本地蓝牙适配器
		bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();

		discoverbutton = (Button) findViewById(R.id.discoverbutton);
		scannbutton = (Button) findViewById(R.id.scannbutton);
		scannbutton.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View v) {
				// d得到BluetoothAdapter的对象
				BluetoothAdapter adapter = BluetoothAdapter.getDefaultAdapter();
				// 判断是否为空
				if (adapter != null) {
					System.out.println("本机拥有蓝牙设备");
					// 是否可用
					if (!adapter.isEnabled()) {
						// 得到允许用户打开蓝牙的意图
						Intent intent = new Intent(
								BluetoothAdapter.ACTION_REQUEST_ENABLE);
						startActivity(intent);
					}
					// 得到所有已经适配好的蓝牙设备
					Set<BluetoothDevice> devices = adapter.getBondedDevices();
					if (devices.size() > 0) {
						for (Iterator iterator = devices.iterator(); iterator
								.hasNext();) {

							BluetoothDevice bluetoothDevice = (BluetoothDevice) iterator
									.next();
							// 输出远程蓝牙设备的地址
							System.out.println(bluetoothDevice.getAddress());
						}
					}
				} else {
					System.out.println("没有蓝牙设备！！！");
				}
				bluetoothAdapter.startDiscovery();
			}
		});
		// 设置蓝牙设备在500s可见的监听事件

		discoverbutton.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View v) {
				// 创建一个意图与一个给定的行动。
				Intent discoverIntent = new Intent(
						BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
				// 蓝牙设备在500s的请求时间内可见
				discoverIntent.putExtra(
						BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 500);
				startActivity(discoverIntent);
			}
		});

	}

	// ji接收广播事件
	private class BluetoothReceiver extends BroadcastReceiver {

		@Override
		public void onReceive(Context context, Intent intent) {
			// 得到当前的动作
			String action = intent.getAction();
			if (BluetoothDevice.ACTION_FOUND.equals(action)) {
				// 如果1~10m内存在蓝牙设备的到他的地址
				BluetoothDevice device = intent
						.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
				System.out.println(device.getAddress());
			}

		}

	}

	protected void onDestory() {
		unregisterReceiver(bluetoothReceiver);
		super.onDestroy();
	}

}

3.亲、不要忘了添加权限哦！不然找了半天的错你也很难找到的

 <!-- 蓝牙操作权限 -->
<uses-permission
    android:name="android.permission.BLUETOOTH_ADMIN"
    />
<!--蓝牙使用权限  -->
<uses-permission 
    android:name="android.permission.BLUETOOTH"
    />

4.运行结果：由于模拟器上没有蓝牙设备，只能在自己手机上运行，所以呢，效果图没发传上。