android之蓝牙操作（1）

android之蓝牙操作（一）
与蓝牙相关的API

1、BluetoothAdapter
该类的对象代表了本地的蓝牙适配器
2、BluetoothDevice
该类的对象代表了远程的蓝牙适配器

扫描已经配对的蓝牙设备步骤：

1、获得BluetoothAdapter对象
2、判断当前的设备中是否有蓝牙设备
3、判断当前设备中的蓝牙设备是否已经打开
4、得到所以已经配对的蓝牙设备对象

在AndroidManifedt.xml中声明蓝牙权限

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"      package="test.bluetooth01"      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=".TestBluetoothActivity"                  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"/></manifest>

在布局文件中添加一个按钮
main.xml

<?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/button"    android:layout_width="fill_parent"    android:layout_height="wrap_content"    android:text="扫描蓝牙设备"    /></LinearLayout>

MainActivity.java

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 TestBluetoothActivity extends Activity {    /** Called when the activity is first created. */	private Button button = null;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);                button = (Button)findViewById(R.id.button);        button.setOnClickListener(new ButtonListener());    }    private class ButtonListener implements OnClickListener    {		@Override		public void onClick(View v) {			// TODO Auto-generated method stub			//得到BluetoothAdapter对象			BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();			//判断BluetoothAdapter对象是否为空，若为空，则本机上无蓝牙设备			if (bluetoothAdapter != null) {				System.out.println("本机上拥有蓝牙设备");				if (!bluetoothAdapter.enable()) {					//创建一个Intent对象，该对象用来启动另外一个Activity，提示用户启动蓝牙设备					Intent intent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);					startActivity(intent);				}				//得到所有已经匹配的蓝牙适配器对象				Set<BluetoothDevice> device = bluetoothAdapter.getBondedDevices();				if (device.size()>0) {					for (Iterator iterator = device.iterator(); iterator							.hasNext();) {						BluetoothDevice bluetoothDevice = (BluetoothDevice) iterator								.next();						System.out.println(bluetoothDevice.getAddress());					}				}							}			else 			{				System.out.println("本机上无蓝牙设备");			}		}    	    }}