学步园

关于设置蓝牙的可见性和扫描周围蓝牙设备的方法，需要用到广播接收器

package tjj.bluetooth2;

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.widget.Button;

public class TestBlueTooth2Activity extends Activity
{
	private BluetoothAdapter bluetoothadapter;
	private Button scanbutton;
	private Button discoverbutton;


	public void onCreate(Bundle savedInstanceState)
	{
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);

		discoverbutton = (Button) findViewById(R.id.button1);
		scanbutton = (Button) findViewById(R.id.button2);

		discoverbutton.setOnClickListener(DiscoverButtonListener);
		scanbutton.setOnClickListener(ScanButtonListener);
		
		//得到一个代表本地蓝牙设备的bluetoothadapter
		bluetoothadapter = BluetoothAdapter.getDefaultAdapter();
		//设置一个过滤器，将action设置为BluetoothDevice.ACTION_FOUND
		IntentFilter intentfilter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
		//得到一个关于蓝牙的广播接收器
		BluetoothReceiver bluetoothreceiver = new BluetoothReceiver();
		//将广播接收器和过滤器注册起来
		registerReceiver(bluetoothreceiver, intentfilter);
		

	}

	private Button.OnClickListener DiscoverButtonListener = new Button.OnClickListener()
	{

		public void onClick(View v)
		{
			//設置可見性
			Intent discoverableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
			//设置可见时间
			discoverableIntent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 500);
			//打开的Activity是android自带的一个
			startActivity(discoverableIntent);
		}

	};

	private Button.OnClickListener ScanButtonListener = new Button.OnClickListener()
	{
		public void onClick(View v)
		{
			//开始扫描周围的蓝牙设备，一次最少12秒，每扫描到一个蓝牙设备，就会发送一个广播，因此需要一个过滤器和广播接收器
			bluetoothadapter.startDiscovery();
		}

	};
}

class BluetoothReceiver extends BroadcastReceiver
{
	public void onReceive(Context context, Intent intent)
	{
		//能够通过这个过滤器的，它的action一定为我们需要的
		BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
		System.out.println(device.getAddress());
	}
}