搜索附近的蓝牙设备，并将其名字和mac地址现在在textview中

上一篇文章已经写了如何打开蓝牙设备，显示已经配对成功的蓝牙设备，http://blog.csdn.net/liuzuyi200/article/details/37740401

这篇文章主要写如何搜索蓝牙设备

（2）搜索蓝牙设备需要执行startDiscovery()这个方法，这个过程会大约持续12秒。

if (mBluetoothAdapter.isDiscovering()) {              mBluetoothAdapter.cancelDiscovery();          }          // 开始搜索蓝牙设备,搜索到的蓝牙设备通过广播返回          mBluetoothAdapter.startDiscovery();  

要执行这个方法必须注册一个BroadcastReceiver，属性BluetoothDevice.ACTION_FOUND的intent 

private final BroadcastReceiver Receiver = new BroadcastReceiver(){     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) {                                    textview1.append(device.getName() + ":"                              + device.getAddress() + "\n\n");                 }            }}};

注册BroadcastReceiver用下面这句话完成，分别在调用开始和结束时使用
 

IntentFilter Filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);          registerReceiver( Receiver , Filter);               Filter = new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);          registerReceiver( Receiver , Filter);  

如果调用结束，还需要取消注册

protected void onDestroy() {          // TODO Auto-generated method stub          super.onDestroy();          //解除注册          unregisterReceiver(Receiver);      } 

下面是打开蓝牙设备 显示已经配对的蓝牙设备 ，搜索附近的蓝牙设备，并将已配对的蓝牙设备显示在textview中的布局文件和源码

activity_main.xml

<ScrollView 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"><LinearLayout        android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical" >    <Button        android:id="@+id/button1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="Button" />    <TextView        android:id="@+id/Textview1"        android:layout_width="150dp"        android:layout_height="wrap_content"        android:layout_weight="1" /></LinearLayout></ScrollView>

MainActivity

package com.liuzuyi.bluetooth;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.os.Parcelable;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.TextView;import android.widget.Toast;public class MainActivity extends Activity {private static final int REQUEST_ENABLE_BT = 1;private Button button;private TextView textview1;protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);button=(Button)findViewById(R.id.button1);        textview1=(TextView )findViewById(R.id.Textview1);button.setOnClickListener( new blue()); IntentFilter Filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);          registerReceiver( Receiver , Filter);                Filter = new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);          registerReceiver( Receiver , Filter);  }private final BroadcastReceiver Receiver = new BroadcastReceiver(){     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) {                                    textview1.append(device.getName() + ":"                              + device.getAddress() + "\n\n");                 }            }}};protected void onDestroy() {          // TODO Auto-generated method stub          super.onDestroy();          //解除注册          unregisterReceiver(Receiver);      }  class blue implements OnClickListener{@Overridepublic void onClick(View v) {  BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();if (mBluetoothAdapter == null) {   Toast.makeText(MainActivity.this, "此设备不支持蓝牙传输功能！", Toast.LENGTH_SHORT).show();}else{Toast.makeText(MainActivity.this, "此设备支持蓝牙传输功能！", Toast.LENGTH_SHORT).show();if (!mBluetoothAdapter.isEnabled()) {  Intent enableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);    enableIntent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 300);              startActivityForResult(enableIntent, REQUEST_ENABLE_BT);           Toast.makeText(MainActivity.this, "蓝牙设备已经打开！", Toast.LENGTH_SHORT).show();                  } if (mBluetoothAdapter.isDiscovering()) {              mBluetoothAdapter.cancelDiscovery();          }          // 开始搜索蓝牙设备,搜索到的蓝牙设备通过广播返回          mBluetoothAdapter.startDiscovery();       Set<BluetoothDevice> pairedDevices=mBluetoothAdapter.getBondedDevices();if(pairedDevices.size() > 0){for (BluetoothDevice bluetoothDevice : pairedDevices) {textview1.append(bluetoothDevice.getName() + ":"                          + bluetoothDevice.getAddress() + "\n\n");}}  }      }}}

说明：点击按钮，就会把未配对过的蓝牙设备的名字和mac地址显示在textview中，如果想显示所有的蓝牙设备就把onReceive方法中的if语句去掉。