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();
    }*/
}