Android开发之蓝牙(Bluetooth)操作(二)--修改本机蓝牙设备的可见性,并扫描周围可用的蓝牙设备

一.修改本机蓝牙设备的可见性

二.扫描周围可用的蓝牙设备

Eg:

一. 清单文件AdroidManifest.xml:

<?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>

二. 布局文件: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/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>

三. MainActivity:

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());
		}
    	
    }
}