android之蓝牙操作（2）

android之蓝牙操作（二）
1、修改本蓝牙设备的可见性
2、扫描周围可用蓝牙设备

步骤：
1、在androidManifest.xml中添加以下代码

  <uses-permission android:name="android.permission.BLUETOOTH"/>    <uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>

2、在布局文件main.xml中添加两个按钮

<?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/discoverId"    android:layout_width="fill_parent"    android:layout_height="wrap_content"    android:text="设置可见性"           />    <Button     android:id="@+id/scanId"    android:layout_width="fill_parent"    android:layout_height="wrap_content"    android:text="开始扫描"    /></LinearLayout>

3、Activity文件

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 TestBluetooth02Activity extends Activity {    /** Called when the activity is first created. */	private Button discoverButton = null;	private Button scanButton = null;	private BluetoothReceiver bluetoothReceiver = null;	private BluetoothAdapter bluetoothAdapter = null;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);                discoverButton = (Button)findViewById(R.id.discoverId);        discoverButton.setOnClickListener(new DiscoverButtonListener());        //创建一个IntentFilter对象，将其action制定为BluetoothDevice.ACTION_FOUND        IntentFilter intentFilter = new IntentFilter(BluetoothDevice.ACTION_FOUND);        //生成一个BluetoothReceive对象        bluetoothReceiver = new BluetoothReceiver();        //注册广播接收器        registerReceiver(bluetoothReceiver,intentFilter);        bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();        scanButton = (Button)findViewById(R.id.scanId);        scanButton.setOnClickListener(new ScanButtonListener());    }    private class DiscoverButtonListener implements OnClickListener    {		@Override		public void onClick(View v) {			// TODO Auto-generated method stub			//创建一个Intent对象，并惊奇Action的值设置为BluetoothAdapter.ACTION_REQEST_DISCOVERABLE			Intent discoverIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);			//将一个键值对放在Intent对象中，主要用于指定可见状态的持续时间			discoverIntent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 500);			startActivity(discoverIntent);		}    	    	    }    private class BluetoothReceiver extends BroadcastReceiver    {		@Override		public void onReceive(Context context, Intent intent) {			// TODO Auto-generated method stub			String action = intent.getAction();			if (BluetoothDevice.ACTION_FOUND.equals(action)) {				//可以从收到的Intent对象当中，将代表远程的蓝牙适配器的对象取出				BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);				System.out.println(device.getAddress());			}		}    	    	    }    private class ScanButtonListener implements OnClickListener    {		@Override		public void onClick(View v) {			// TODO Auto-generated method stub			bluetoothAdapter.startDiscovery();		}    	    }  /*  protected void onDestroy    {    	unregisterReceiver(bluetoothReceiver);    	super.onDestroy();    }*/}