Android开发之蓝牙(Bluetooth)操作(2)-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>

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300discoverIntent.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());		}    	    }}