android-设置蓝牙的可见性

package zhang.bluetooth;

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 bluetooth_02 extends Activity {
@Override
protected void onDestroy() {
// TODO Auto-generated method stub
unregisterReceiver(bluetoothReceiver);
super.onDestroy();
}
private Button set;
private Button scan;
private BluetoothReceiver bluetoothReceiver =null;
private BluetoothAdapter bluetoothAdapter=null;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
set=(Button)findViewById(R.id.set);
scan=(Button)findViewById(R.id.scan);

set.setOnClickListener(new setListener());
IntentFilter intentFilter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
bluetoothReceiver = new BluetoothReceiver();
System.out.println(scan);
scan.setOnClickListener(new scanListener());

}
public 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)){
BluetoothDevice device=intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
System.out.println(device.getAddress());
}
}
}
class setListener implements OnClickListener{
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
Intent dis=new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
dis.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 500);
startActivity(dis);
}
}
class scanListener implements OnClickListener{

@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
//与之前的类似
}
}
}