ANDROID_MARS学习笔记_S03_002_设置可见性及扫描蓝牙设备

一、代码

1.xml

(1)AndroidManifest.xml

1     <uses-permission android:name="android.permission.BLUETOOTH"/>
2     <uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
3 </manifest>      

2.java

(1)MainActivity.java

1 package com.bluetooth2;
 2 
 3 import android.app.Activity;
 4 import android.bluetooth.BluetoothAdapter;
 5 import android.bluetooth.BluetoothDevice;
 6 import android.content.BroadcastReceiver;
 7 import android.content.Context;
 8 import android.content.Intent;
 9 import android.content.IntentFilter;
10 import android.os.Bundle;
11 import android.view.View;
12 import android.view.View.OnClickListener;
13 import android.widget.Button;
14 
15 public class MainActivity extends Activity {
16 
17     private Button discoverButton = null;
18     private Button scanButton = null;
19     private BluetoothAdapter adapter = null;
20     private BluetoothReceiver bluetoothReceiver = null;
21     
22     @Override
23     protected void onCreate(Bundle savedInstanceState) {
24         super.onCreate(savedInstanceState);
25         setContentView(R.layout.activity_main);
26         
27         adapter = BluetoothAdapter.getDefaultAdapter();
28         
29         discoverButton = (Button) findViewById(R.id.discoverButton);
30         scanButton = (Button) findViewById(R.id.scanButton);
31         
32         discoverButton.setOnClickListener(new OnClickListener() {
33             @Override
34             public void onClick(View v) {
35                 Intent discoverIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
36                 //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300
37                 discoverIntent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 500);
38                 System.out.println("设置蓝牙可见性-->");
39                 startActivity(discoverIntent);//android自带的activity
40             }
41         });
42         
43         scanButton.setOnClickListener(new OnClickListener() {
44             @Override
45             public void onClick(View v) {
46                 //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
47                 System.out.println("开始扫描周围蓝牙设备-->");
48                 adapter.startDiscovery();
49             }
50         });
51         
52         //设定广播接收的filter
53         IntentFilter intentFilter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
54         //创建蓝牙广播信息的receiver
55         bluetoothReceiver = new BluetoothReceiver();
56         //注册广播接收器
57         registerReceiver(bluetoothReceiver, intentFilter);
58     }
59     
60     private class BluetoothReceiver extends BroadcastReceiver {
61         @Override
62         public void onReceive(Context context, Intent intent) {
63             //获得扫描到的远程蓝牙设备
64             BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
65             System.out.println("BluetoothReceiver收到广播---->" + device);
66         }
67     }
68 }