Android提高第十三篇之探秘蓝牙隐藏API

本文来自http://blog.csdn.net/hellogv/ ,引用必须注明出处!

       上次讲解Android的蓝牙基本用法,这次讲得深入些,探讨下蓝牙方面的隐藏API。用过Android系统设置(Setting)的人都知道蓝牙搜索之后可以建立配对解除配对,但是这两项功能的函数没有在SDK中给出,那么如何去使用这两项功能呢?本文利用JAVA的反射机制去调用这两项功能对应的函数:createBond和removeBond,具体的发掘和实现步骤如下:

1.使用Git工具下载platform/packages/apps/Settings.git,在Setting源码中查找关于建立配对解除配对的API,知道这两个API的宿主(BluetoothDevice);

2.使用反射机制对BluetoothDevice枚举其所有方法和常量,看看是否存在:

 

view plain print ?
  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.     }  
  24. }  
  

结果如下:

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.如果枚举发现API存在(SDK却隐藏),则自己实现调用方法:

view plain print ?
  1. /** 
  2.  * 与设备配对 参考源码: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.  * 与设备解除配对 参考源码: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();  
  19. }  

PS:SDK之所以不给出隐藏的API肯定有其原因,也许是出于安全性或者是后续版本兼容性的考虑,因此不能保证隐藏API能在所有Android平台上很好地运行。。。

本文程序运行效果如下:

main.xml源码如下:

view plain print ?
  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>  

工具类ClsUtils.java源码如下:

view plain print ?
  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.      * 与设备配对 参考源码: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.      * 与设备解除配对 参考源码: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的源码如下:

view plain print ?
  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 adtDevices;  
  25.     List lstDevices = new ArrayList();  
  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(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();// 初始化本机蓝牙功能  
  46.         if (btAdapt.getState() == BluetoothAdapter.STATE_OFF)// 开蓝牙  
  47.             btAdapt.enable();  
  48.   
  49.         // 注册Receiver来获取蓝牙设备相关的结果  
  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.             // 显示所有收到的消息及其细节  
  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.             // 搜索设备时,取得设备的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 = "未配对|" + device.getName() + "|" + device.getAddress();  
  76.                     lstDevices.add(str); // 获取设备名称和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("未配对"))  
  96.                 {     
  97.                     Toast.makeText(testReflect.this"由未配对转为已配对"500).show();  
  98.                     ClsUtils.createBond(btDevice.getClass(), btDevice);  
  99.                 }  
  100.                 else if(values[0].equals("已配对"))  
  101.                 {  
  102.                     Toast.makeText(testReflect.this"由已配对转为未配对"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.      * 按键处理 
  115.      * @author GV 
  116.      * 
  117.      */  
  118.     class ClickEvent implements View.OnClickListener {  
  119.   
  120.         @Override  
  121.         public void onClick(View v) {  
  122.             if (v == btnSearch) {//搜索附近的蓝牙设备  
  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 = "已配对|" + device.getName() + "|" + device.getAddress();  
  129.                     lstDevices.add(str); // 获取设备名称和mac地址  
  130.                     adtDevices.notifyDataSetChanged();  
  131.                 }  
  132.                 // 开始搜索  
  133.                 setTitle("本机蓝牙地址:" + btAdapt.getAddress());  
  134.                 btAdapt.startDiscovery();  
  135.             }  
  136.             else if(v==btnShow){//显示BluetoothDevice的所有方法和常量,包括隐藏API  
  137.                 ClsUtils.printAllInform(btDevice.getClass());  
  138.             }  
  139.   
  140.         }  
  141.   
  142.     }  
  143.   
  144.   
  145. }  

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