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);
        }
    }
}