旺仔：Android的蓝牙技术（一）（Genymotion模拟器测试没有实现）

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.hanqi.bluetooth.MainActivity"
    android:orientation="vertical">
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="搜索蓝牙设备"
        android:onClick="bt_OnClick"/>

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/tvDevices"
         />
</LinearLayout>

package com.hanqi.bluetooth;

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.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;

import java.util.Set;

public class MainActivity extends AppCompatActivity {
    TextView tvDevices;
    BluetoothAdapter mBluetoothAdapter;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        tvDevices=(TextView)findViewById(R.id.tvDevices);
        //获取本地蓝牙适配器
        mBluetoothAdapter=BluetoothAdapter.getDefaultAdapter();
        Set<BluetoothDevice> paireDevices=mBluetoothAdapter.getBondedDevices();
        if (paireDevices.size()>0)
        {
         for (BluetoothDevice device:paireDevices)
         {
             tvDevices.append(device.getName()+":"+device.getAddress());
         }
        }
        IntentFilter filter=new IntentFilter(BluetoothDevice.ACTION_FOUND);
        this.registerReceiver(receiver,filter);
        filter=new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
        this.registerReceiver(receiver,filter);
    }
    public void bt_OnClick(View v)
    {
        setProgressBarIndeterminateVisibility(true);
        setTitle("正在扫描...");
        if (mBluetoothAdapter.isDiscovering())
        {
         mBluetoothAdapter.cancelDiscovery();
        }
        mBluetoothAdapter.startDiscovery();
    }
    private final BroadcastReceiver receiver=new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            String action=intent.getAction();
            if (BluetoothDevice.ACTION_FOUND.equals(action))
            {
                BluetoothDevice device=intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                if (device.getBondState()!=BluetoothDevice.BOND_BONDED)
                {
                     tvDevices.append(device.getName()+":"+device.getAddress());
                }
            }else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action))
            {
               setProgressBarVisibility(false);
                setTitle("已搜索完成");
            }


        }
    };
}