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

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

2.java
(1)MainActivity.java

 package com.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.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;

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);

         adapter = BluetoothAdapter.getDefaultAdapter();

         discoverButton = (Button) findViewById(R.id.discoverButton);
         scanButton = (Button) findViewById(R.id.scanButton);

         discoverButton.setOnClickListener(new OnClickListener() {
             @Override
             public void onClick(View v) {
                 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300
                 discoverIntent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 500);
                 System.out.println("设置蓝牙可见性-->");
                 startActivity(discoverIntent);//android自带的activity
             }
         });

         scanButton.setOnClickListener(new OnClickListener() {
             @Override
             public 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
                 System.out.println("开始扫描周围蓝牙设备-->");
                 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 {
         @Override
         public 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("BluetoothReceiver收到广播---->" + device);
         }
     }
 }