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");
			}
		}
    	
    }
}