Android开发之蓝牙(Bluetooth)操作(二)--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:

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(){@Overridepublic 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(){@Overridepublic 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{@Overridepublic 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());}        }}