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 Android教程網 >> Android技術 >> Android開發實例 >> Android提高第十三篇之探秘藍牙隱藏API

Android提高第十三篇之探秘藍牙隱藏API

編輯:Android開發實例

       上次講解Android的藍牙基本用法,這次講得深入些,探討下藍牙方面的隱藏API。用過Android系統設置(Setting)的人都知道藍牙搜索之後可以建立配對解除配對,但是這兩項功能的函數沒有在SDK中給出,那麼如何去使用這兩項功能呢?本文利用JAVA的反射機制去調用這兩項功能對應的函數:createBond和removeBond,具體的發掘和實現步驟如下:

1.使用Git工具下載platform/packages/apps/Settings.git,在Setting源碼中查找關於建立配對解除配對的API,知道這兩個API的宿主(BluetoothDevice);

2.使用反射機制對BluetoothDevice枚舉其所有方法和常量,看看是否存在:

  1. static public void printAllInform(Class clsShow) {  
  2.     try {  
  3.         // 取得所有方法  
  4.         Method[] hideMethod = clsShow.getMethods();  
  5.         int i = 0;  
  6.         for (; i < hideMethod.length; i++) {  
  7.             Log.e("method name", hideMethod[i].getName());  
  8.         }  
  9.         // 取得所有常量  
  10.         Field[] allFields = clsShow.getFields();  
  11.         for (i = 0; i < allFields.length; i++) {  
  12.             Log.e("Field name", allFields[i].getName());  
  13.         }  
  14.     } catch (SecurityException e) {  
  15.         // throw new RuntimeException(e.getMessage());  
  16.         e.printStackTrace();  
  17.     } catch (IllegalArgumentException e) {  
  18.         // throw new RuntimeException(e.getMessage());  
  19.         e.printStackTrace();  
  20.     } catch (Exception e) {  
  21.         // TODO Auto-generated catch block  
  22.         e.printStackTrace();  
  23.     }  

  

結果如下:

11-29 09:19:12.012: method name(452): cancelBondProcess
11-29 09:19:12.020: method name(452): cancelPairingUserInput
11-29 09:19:12.020: method name(452): createBond
11-29 09:19:12.020: method name(452): createInsecureRfcommSocket
11-29 09:19:12.027: method name(452): createRfcommSocket
11-29 09:19:12.027: method name(452): createRfcommSocketToServiceRecord
11-29 09:19:12.027: method name(452): createScoSocket
11-29 09:19:12.027: method name(452): describeContents
11-29 09:19:12.035: method name(452): equals
11-29 09:19:12.035: method name(452): fetchUuidsWithSdp
11-29 09:19:12.035: method name(452): getAddress
11-29 09:19:12.035: method name(452): getBluetoothClass
11-29 09:19:12.043: method name(452): getBondState
11-29 09:19:12.043: method name(452): getName
11-29 09:19:12.043: method name(452): getServiceChannel
11-29 09:19:12.043: method name(452): getTrustState
11-29 09:19:12.043: method name(452): getUuids
11-29 09:19:12.043: method name(452): hashCode
11-29 09:19:12.043: method name(452): isBluetoothDock
11-29 09:19:12.043: method name(452): removeBond
11-29 09:19:12.043: method name(452): setPairingConfirmation
11-29 09:19:12.043: method name(452): setPasskey
11-29 09:19:12.043: method name(452): setPin
11-29 09:19:12.043: method name(452): setTrust
11-29 09:19:12.043: method name(452): toString
11-29 09:19:12.043: method name(452): writeToParcel
11-29 09:19:12.043: method name(452): convertPinToBytes
11-29 09:19:12.043: method name(452): getClass
11-29 09:19:12.043: method name(452): notify
11-29 09:19:12.043: method name(452): notifyAll
11-29 09:19:12.043: method name(452): wait
11-29 09:19:12.051: method name(452): wait
11-29 09:19:12.051: method name(452): wait

3.如果枚舉發現API存在(SDK卻隱藏),則自己實現調用方法:

  1. /**  
  2.  * 與設備配對 參考源碼:platform/packages/apps/Settings.git  
  3.  * \Settings\src\com\android\settings\bluetooth\CachedBluetoothDevice.java  
  4.  */ 
  5. static public boolean createBond(Class btClass,BluetoothDevice btDevice) throws Exception {  
  6.     Method createBondMethod = btClass.getMethod("createBond");  
  7.     Boolean returnValue = (Boolean) createBondMethod.invoke(btDevice);  
  8.     return returnValue.booleanValue();  
  9. }  
  10.  
  11. /**  
  12.  * 與設備解除配對 參考源碼:platform/packages/apps/Settings.git  
  13.  * \Settings\src\com\android\settings\bluetooth\CachedBluetoothDevice.java  
  14.  */ 
  15. static public boolean removeBond(Class btClass,BluetoothDevice btDevice) throws Exception {  
  16.     Method removeBondMethod = btClass.getMethod("removeBond");  
  17.     Boolean returnValue = (Boolean) removeBondMethod.invoke(btDevice);  
  18.     return returnValue.booleanValue();  

 

PS:SDK之所以不給出隱藏的API肯定有其原因,也許是出於安全性或者是後續版本兼容性的考慮,因此不能保證隱藏API能在所有Android平台上很好地運行。。。

本文程序運行效果如下:

main.xml源碼如下:

  1. <?xml version="1.0" encoding="utf-8"?> 
  2. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
  3.     android:orientation="vertical" android:layout_width="fill_parent" 
  4.     android:layout_height="fill_parent"> 
  5.     <LinearLayout android:id="@+id/LinearLayout01" 
  6.         android:layout_height="wrap_content" android:layout_width="fill_parent"> 
  7.         <Button android:layout_height="wrap_content" android:id="@+id/btnSearch" 
  8.             android:text="Search" android:layout_width="160dip"></Button> 
  9.         <Button android:layout_height="wrap_content" 
  10.             android:layout_width="160dip" android:text="Show" android:id="@+id/btnShow"></Button> 
  11.     </LinearLayout> 
  12.     <LinearLayout android:id="@+id/LinearLayout02" 
  13.         android:layout_width="wrap_content" android:layout_height="wrap_content"></LinearLayout> 
  14.     <ListView android:id="@+id/ListView01" android:layout_width="fill_parent" 
  15.         android:layout_height="fill_parent"> 
  16.     </ListView> 
  17. </LinearLayout> 

 

工具類ClsUtils.java源碼如下:

  1. package com.testReflect;  
  2.  
  3. import java.lang.reflect.Field;  
  4. import java.lang.reflect.Method;  
  5.  
  6. import android.bluetooth.BluetoothDevice;  
  7. import android.util.Log;  
  8.  
  9. public class ClsUtils {  
  10.  
  11.     /**  
  12.      * 與設備配對 參考源碼:platform/packages/apps/Settings.git  
  13.      * \Settings\src\com\android\settings\bluetooth\CachedBluetoothDevice.java  
  14.      */ 
  15.     static public boolean createBond(Class btClass,BluetoothDevice btDevice) throws Exception {  
  16.         Method createBondMethod = btClass.getMethod("createBond");  
  17.         Boolean returnValue = (Boolean) createBondMethod.invoke(btDevice);  
  18.         return returnValue.booleanValue();  
  19.     }  
  20.  
  21.     /**  
  22.      * 與設備解除配對 參考源碼:platform/packages/apps/Settings.git  
  23.      * \Settings\src\com\android\settings\bluetooth\CachedBluetoothDevice.java  
  24.      */ 
  25.     static public boolean removeBond(Class btClass,BluetoothDevice btDevice) throws Exception {  
  26.         Method removeBondMethod = btClass.getMethod("removeBond");  
  27.         Boolean returnValue = (Boolean) removeBondMethod.invoke(btDevice);  
  28.         return returnValue.booleanValue();  
  29.     }  
  30.  
  31.     /**  
  32.      *   
  33.      * @param clsShow  
  34.      */ 
  35.     static public void printAllInform(Class clsShow) {  
  36.         try {  
  37.             // 取得所有方法  
  38.             Method[] hideMethod = clsShow.getMethods();  
  39.             int i = 0;  
  40.             for (; i < hideMethod.length; i++) {  
  41.                 Log.e("method name", hideMethod[i].getName());  
  42.             }  
  43.             // 取得所有常量  
  44.             Field[] allFields = clsShow.getFields();  
  45.             for (i = 0; i < allFields.length; i++) {  
  46.                 Log.e("Field name", allFields[i].getName());  
  47.             }  
  48.         } catch (SecurityException e) {  
  49.             // throw new RuntimeException(e.getMessage());  
  50.             e.printStackTrace();  
  51.         } catch (IllegalArgumentException e) {  
  52.             // throw new RuntimeException(e.getMessage());  
  53.             e.printStackTrace();  
  54.         } catch (Exception e) {  
  55.             // TODO Auto-generated catch block  
  56.             e.printStackTrace();  
  57.         }  
  58.     }  
  59. }  

 

主程序testReflect.java的源碼如下:

  1. package com.testReflect;  
  2.  
  3. import java.util.ArrayList;  
  4. import java.util.List;  
  5. import android.app.Activity;  
  6. import android.bluetooth.BluetoothAdapter;  
  7. import android.bluetooth.BluetoothDevice;  
  8. import android.content.BroadcastReceiver;  
  9. import android.content.Context;  
  10. import android.content.Intent;  
  11. import android.content.IntentFilter;  
  12. import android.os.Bundle;  
  13. import android.util.Log;  
  14. import android.view.View;  
  15. import android.widget.AdapterView;  
  16. import android.widget.ArrayAdapter;  
  17. import android.widget.Button;  
  18. import android.widget.ListView;  
  19. import android.widget.Toast;  
  20.  
  21. public class testReflect extends Activity {  
  22.     Button btnSearch, btnShow;  
  23.     ListView lvBTDevices;  
  24.     ArrayAdapter<String> adtDevices;  
  25.     List<String> lstDevices = new ArrayList<String>();  
  26.     BluetoothDevice btDevice;  
  27.     BluetoothAdapter btAdapt;  
  28.  
  29.     @Override 
  30.     public void onCreate(Bundle savedInstanceState) {  
  31.         super.onCreate(savedInstanceState);  
  32.         setContentView(R.layout.main);  
  33.  
  34.         btnSearch = (Button) this.findViewById(R.id.btnSearch);  
  35.         btnSearch.setOnClickListener(new ClickEvent());  
  36.         btnShow = (Button) this.findViewById(R.id.btnShow);  
  37.         btnShow.setOnClickListener(new ClickEvent());  
  38.  
  39.         lvBTDevices = (ListView) this.findViewById(R.id.ListView01);  
  40.         adtDevices = new ArrayAdapter<String>(testReflect.this,  
  41.                 android.R.layout.simple_list_item_1, lstDevices);  
  42.         lvBTDevices.setAdapter(adtDevices);  
  43.         lvBTDevices.setOnItemClickListener(new ItemClickEvent());  
  44.  
  45.         btAdapt = BluetoothAdapter.getDefaultAdapter();// 初始化本機藍牙功能  
  46.         if (btAdapt.getState() == BluetoothAdapter.STATE_OFF)// 開藍牙  
  47.             btAdapt.enable();  
  48.  
  49.         // 注冊Receiver來獲取藍牙設備相關的結果  
  50.         IntentFilter intent = new IntentFilter();  
  51.         intent.addAction(BluetoothDevice.ACTION_FOUND);  
  52.         intent.addAction(BluetoothDevice.ACTION_BOND_STATE_CHANGED);  
  53.         registerReceiver(searchDevices, intent);  
  54.  
  55.     }  
  56.  
  57.       
  58.     private BroadcastReceiver searchDevices = new BroadcastReceiver() {  
  59.         public void onReceive(Context context, Intent intent) {  
  60.             String action = intent.getAction();  
  61.             Bundle b = intent.getExtras();  
  62.             Object[] lstName = b.keySet().toArray();  
  63.  
  64.             // 顯示所有收到的消息及其細節  
  65.             for (int i = 0; i < lstName.length; i++) {  
  66.                 String keyName = lstName[i].toString();  
  67.                 Log.e(keyName, String.valueOf(b.get(keyName)));  
  68.             }  
  69.             // 搜索設備時,取得設備的MAC地址  
  70.             if (BluetoothDevice.ACTION_FOUND.equals(action)) {  
  71.                 BluetoothDevice device = intent  
  72.                         .getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);  
  73.  
  74.                 if (device.getBondState() == BluetoothDevice.BOND_NONE) {  
  75.                     String str = "未配對|" + device.getName() + "|" + device.getAddress();  
  76.                     lstDevices.add(str); // 獲取設備名稱和mac地址  
  77.                     adtDevices.notifyDataSetChanged();  
  78.                 }  
  79.             }  
  80.         }  
  81.     };  
  82.  
  83.     class ItemClickEvent implements AdapterView.OnItemClickListener {  
  84.  
  85.         @Override 
  86.         public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,  
  87.                 long arg3) {  
  88.             btAdapt.cancelDiscovery();  
  89.             String str = lstDevices.get(arg2);  
  90.             String[] values = str.split("\\|");  
  91.             String address=values[2];  
  92.  
  93.             btDevice = btAdapt.getRemoteDevice(address);  
  94.             try {  
  95.                 if(values[0].equals("未配對"))  
  96.                 {     
  97.                     Toast.makeText(testReflect.this, "由未配對轉為已配對", 500).show();  
  98.                     ClsUtils.createBond(btDevice.getClass(), btDevice);  
  99.                 }  
  100.                 else if(values[0].equals("已配對"))  
  101.                 {  
  102.                     Toast.makeText(testReflect.this, "由已配對轉為未配對", 500).show();  
  103.                     ClsUtils.removeBond(btDevice.getClass(), btDevice);  
  104.                 }  
  105.             } catch (Exception e) {  
  106.                 // TODO Auto-generated catch block  
  107.                 e.printStackTrace();  
  108.             }  
  109.         }  
  110.           
  111.     }  
  112.       
  113.     /**  
  114.      * 按鍵處理  
  115.      * @author GV  
  116.      *  
  117.      */ 
  118.     class ClickEvent implements View.OnClickListener {  
  119.  
  120.         @Override 
  121.         public void onClick(View v) {  
  122.             if (v == btnSearch) {//搜索附近的藍牙設備  
  123.                 lstDevices.clear();  
  124.                   
  125.                 Object[] lstDevice = btAdapt.getBondedDevices().toArray();  
  126.                 for (int i = 0; i < lstDevice.length; i++) {  
  127.                     BluetoothDevice device=(BluetoothDevice)lstDevice[i];  
  128.                     String str = "已配對|" + device.getName() + "|" + device.getAddress();  
  129.                     lstDevices.add(str); // 獲取設備名稱和mac地址  
  130.                     adtDevices.notifyDataSetChanged();  
  131.                 }  
  132.                 // 開始搜索  
  133.                 setTitle("本機藍牙地址:" + btAdapt.getAddress());  
  134.                 btAdapt.startDiscovery();  
  135.             }  
  136.             else if(v==btnShow){//顯示BluetoothDevice的所有方法和常量,包括隱藏API  
  137.                 ClsUtils.printAllInform(btDevice.getClass());  
  138.             }  
  139.  
  140.         }  
  141.  
  142.     }  
  143.  
  144.  

 

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