蓝牙(2)用BluetoothAdapter搜索蓝牙设备示例

注意在搜索之前要先打开蓝牙设备

 package com.e.search.bluetooth.device;

 import java.util.Set;

 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.Window;
 import android.widget.TextView;

 public class Main extends Activity {
     //搜索蓝牙设备第1步,在manifest.xml中加入权限
     /*
      *  <uses-permission android:name="android.permission.BLUETOOTH" />
      *    <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
      */

     //搜索蓝牙设备第2步,准备BluetoothAdapter
     private BluetoothAdapter mBluetoothAdapter;
     private TextView tvDevices;

     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
         setContentView(R.layout.main);

         tvDevices = (TextView) findViewById(R.id.tvDevices);
         //搜索蓝牙设备第3步,获取或创建BluetoothAdapter
         mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();

         //搜索蓝牙设备第4步,得到已经配对的蓝牙设备.
         Set<BluetoothDevice> pairedDevices = mBluetoothAdapter.getBondedDevices();

         if (pairedDevices.size() > ) {
             //枚举已经配对的设备的名字和地址.
             for (BluetoothDevice device : pairedDevices) {
                 tvDevices.append(device.getName() + ":" + device.getAddress());
             }
         }

         //搜索蓝牙设备第5步,用广播接收器得到蓝牙找到设备和搜索完成广播消息.
         //注册找到蓝牙设备广播接收器,用filter注册
         IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
         this.registerReceiver(receiver, filter);

         //注册搜索蓝牙设备已完成广播接收器,用filter注册
         filter = new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
         this.registerReceiver(receiver, filter);

     }

     /*
      * 开始搜索按钮
      */
     public void onClick_Search(View view) {
         //显示进度条
         setProgressBarIndeterminateVisibility(true);
         setTitle("正在搜索...");
         //搜索蓝牙设备第6步,开始搜索蓝牙设备.
         if (mBluetoothAdapter.isDiscovering()) {//如果正在搜索,那么先取消.
             mBluetoothAdapter.cancelDiscovery();
         }
         mBluetoothAdapter.startDiscovery();//异步的开始搜索.
     }
     //搜索蓝牙设备第7步,处理找到蓝牙设备和搜索完成广播消息.
     private final BroadcastReceiver receiver = new BroadcastReceiver() {

         @Override
         public void onReceive(Context context, Intent intent) {
             String action = intent.getAction();
             if (BluetoothDevice.ACTION_FOUND.equals(action)) {//找到蓝牙设备

                 //搜索蓝牙设备第8步,搜到蓝牙设备.
                 BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                 if (device.getBondState() != BluetoothDevice.BOND_BONDED) {
                 //搜索蓝牙设备第9步,把设备添加到已找到列表中,这里只是显示它的信息.
                     tvDevices.append(device.getName() + ":"+ device.getAddress() + "\n");
                 }
             } else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED.//搜索完成
                     equals(action)) {
                 //搜索蓝牙设备第10步,搜索完毕.
                 setProgressBarVisibility(false);
                 setTitle("已搜素完成");
             }
         }
     };
 }