1、物聯(lián)網(wǎng)應(yīng)用技術(shù)專業(yè)教學(xué)資源庫(kù)文檔文檔來(lái)源院校開(kāi)發(fā)文檔編號(hào)二維碼識(shí)別2016 年 4 月25日activity_main.xml:<RelativeLayout xmlns:android="   xmlns:tools="   android:layout_width="match_parent"   android:layout_height="match_parent"   tools:context=".MainActivity&qu

2、ot; >  <TextView       android:id="+id/text"       android:layout_width="wrap_content"       android:layout_height="wrap_content"       and

3、roid:textAppearance="?android:attr/textAppearanceLarge"       android:text="string/Text" />        <LinearLayout      android:layout_width="match_parent"   

4、60;  android:layout_height="wrap_content"      android:orientation="horizontal"      android:layout_marginTop="30dp" >   <Button      android:id="+id/turnOn" &

5、#160;    android:layout_width="wrap_content"      android:layout_height="wrap_content"      android:text="string/on" />   <Button      android:id="+id/turnOff&

6、quot;      android:layout_width="wrap_content"      android:layout_height="wrap_content"      android:text="string/off" />   </LinearLayout>      

7、   <LinearLayout      android:layout_width="match_parent"      android:layout_height="wrap_content"      android:orientation="vertical"      android:layout_m

8、arginTop="80dp" >             <Button             android:id="+id/paired"             android:layout_width=&q

9、uot;wrap_content"             android:layout_height="wrap_content"             android:text="string/List" />          

10、;            <Button             android:id="+id/search"             android:layout_width="wrap_content"  &

11、#160;          android:layout_height="wrap_content"             android:text="string/Find" />          <ListView    

12、60;         android:id="+id/listView1"              android:layout_width="fill_parent"              android:layout_height=&qu

13、ot;200dp" >                 </ListView>   </LinearLayout></RelativeLayout>建立一個(gè)res/values/strings.xml用于我們菜單顯示：<?xml version="1.0" encoding="utf-8"?><resources>

14、;    <string name="app_name">BluetoothTest</string>    <string name="action_settings">Settings</string>    <string name="Text">Status: -</string>    <string name="on&

15、quot;>Turn On</string>    <string name="off">Turn Off</string>    <string name="List">List paired Devices</string>    <string name="Find">Search new Devices / Cancel</string></r

16、esources>與藍(lán)牙互動(dòng)是通過(guò)BluetoothAdapter類，調(diào)用getDefaultAdapter（）獲得一個(gè)實(shí)例。要打開(kāi)藍(lán)牙，首先我們應(yīng)該檢查是否BluetoothAdapter已經(jīng)啟用。如果不是，使用ACTION_REQUEST_ENABLE意圖調(diào)用startActivityForResult（）方法。注意到startActivityForResult（）方法的第二個(gè)參數(shù)，是整數(shù)，被設(shè)定為大于0。藍(lán)牙一個(gè)非常重要的功能是掃描和搜索，在局部區(qū)域發(fā)現(xiàn)可訪問(wèn)的設(shè)備。當(dāng)我們說(shuō)可發(fā)現(xiàn)，我們的意思是一個(gè)設(shè)備可被啟用，它的信息是共享的可見(jiàn)的。要設(shè)置配對(duì)設(shè)備使用getBondedDevic

17、es（），這樣我們就可以找出所有的BluetoothDevices。考慮到startDiscovery（）方法用于設(shè)備發(fā)現(xiàn)的性能問(wèn)題，要獲得所發(fā)現(xiàn)的BluetoothDevices所有信息，我們應(yīng)該用ACTION_FOUND意圖注冊(cè)一個(gè)BroadcastReceiver。我們建議取消的發(fā)現(xiàn)過(guò)程，因?yàn)锽luetoothAdapter消耗很多資源，所以cancelDiscovery（）用于這個(gè)目的。public class MainActivity extends Activity    private static final int REQUEST_ENABLE_BT =

18、1;   private Button onBtn;   private Button offBtn;   private Button listBtn;   private Button findBtn;   private TextView text;   private BluetoothAdapter myBluetoothAdapter;   private Set<BluetoothDevice> pairedDevices;

19、60;  private ListView myListView;   private ArrayAdapter<String> BTArrayAdapter;     Override   protected void onCreate(Bundle savedInstanceState)       super.onCreate(savedInstanceState);      setCo

20、ntentView(R.layout.activity_main);            / take an instance of BluetoothAdapter - Bluetooth radio      myBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();      if(myBluetoothAdapter =

21、 null)              onBtn.setEnabled(false);             offBtn.setEnabled(false);             listBtn.setEnabled(false);  &#

22、160;          findBtn.setEnabled(false);             text.setText("Status: not supported");                    

23、;      Toast.makeText(getApplicationContext(),"Your device does not support Bluetooth",                      Toast.LENGTH_LONG).show();      else

24、              text = (TextView) findViewById(R.id.text);             onBtn = (Button)findViewById(R.id.turnOn);             onBtn.setOn

25、ClickListener(new OnClickListener()                                   Override             publ

26、ic void onClick(View v)              / TODO Auto-generated method stub                            on(v);   

27、60;                              );                         

28、 offBtn = (Button)findViewById(R.id.turnOff);             offBtn.setOnClickListener(new OnClickListener()                          

29、60;           Override                   public void onClick(View v)                       

30、0;   / TODO Auto-generated method stub                          off(v);                      &#

31、160;         );                          listBtn = (Button)findViewById(R.id.paired);           

32、0; listBtn.setOnClickListener(new OnClickListener()                                       Override        

33、60;         public void onClick(View v)                           / TODO Auto-generated method stub            

34、0;             list(v);                                );          

35、60;               findBtn = (Button)findViewById(R.id.search);             findBtn.setOnClickListener(new OnClickListener()            

36、                           Override                   public void onClick(View v)      

37、60;                    / TODO Auto-generated method stub                          find(v);     

38、                           );                        myListView = (ListView)findViewById(R

39、.id.listView1);                    / create the arrayAdapter that contains the BTDevices, and set it to the ListView             BTArrayAdapter = new Array

40、Adapter<String>(this, android.R.layout.simple_list_item_1);             myListView.setAdapter(BTArrayAdapter);            public void on(View view)      if (!myBluetooth

41、Adapter.isEnabled()          Intent turnOnIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);         startActivityForResult(turnOnIntent, REQUEST_ENABLE_BT);         Toas

42、t.makeText(getApplicationContext(),"Bluetooth turned on" ,                       Toast.LENGTH_LONG).show();            else   

43、;      Toast.makeText(getApplicationContext(),"Bluetooth is already on",                       Toast.LENGTH_LONG).show();        

44、      Override   protected void onActivityResult(int requestCode, int resultCode, Intent data)           / TODO Auto-generated method stub          if(requestCode = REQUEST_ENABLE_BT)&#

45、160;                if(myBluetoothAdapter.isEnabled()                         text.setText("Status: Enabled");  

46、60;              else                            text.setText("Status: Disabled");       &

47、#160;                            public void list(View view)         / get paired devices      pairedDevices = myBluetoothAdapter.

48、getBondedDevices();            / put it's one to the adapter      for(BluetoothDevice device : pairedDevices)             BTArrayAdapter.add(device.getName()+ &q

49、uot;n" + device.getAddress();      Toast.makeText(getApplicationContext(),"Show Paired Devices",                    Toast.LENGTH_SHORT).show();     &#

50、160;         final BroadcastReceiver bReceiver = new BroadcastReceiver()            public void onReceive(Context context, Intent intent)                St

51、ring action = intent.getAction();               / When discovery finds a device               if (BluetoothDevice.ACTION_FOUND.equals(action)     

52、0;               / Get the BluetoothDevice object from the Intent                       BluetoothDevice device = intent.getParcelableEx

53、tra(BluetoothDevice.EXTRA_DEVICE);                       / add the name and the MAC address of the object to the arrayAdapter             &#

54、160;      BTArrayAdapter.add(device.getName() + "n" + device.getAddress();                    BTArrayAdapter.notifyDataSetChanged();        

55、                         ;          public void find(View view)           if (myBluetoothAdapter.isDiscovering

56、()                  / the button is pressed when it discovers, so cancel the discovery                 myBluetoothAdapter.cancelDiscovery();   &#

57、160;                else                      BTArrayAdapter.clear();               &

58、#160;     myBluetoothAdapter.startDiscovery();                                          registe

59、rReceiver(bReceiver, new IntentFilter(BluetoothDevice.ACTION_FOUND);                             public void off(View view)         myBlueto

60、othAdapter.disable();         text.setText("Status: Disconnected");               Toast.makeText(getApplicationContext(),"Bluetooth turned off",       

61、;             Toast.LENGTH_LONG).show();         Override   protected void onDestroy()           / TODO Auto-generated method stub          super.onDestroy();          unregisterReceiver(bReceiver);