本文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和解除配对,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和解除配对的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 plaincopy to clipboardprint?
static public void printAllInform(Class clsShow) {   
    try {   
        // 取得所有方法   
        Method[] hideMethod = clsShow.getMethods();   
        int i = 0;   
        for (; i < hideMethod.length; i++) {   
            Log.e("method name", hideMethod.getName());   
        }   
        // 取得所有常量   
        Field[] allFields = clsShow.getFields();   
        for (i = 0; i < allFields.length; i++) {   
            Log.e("Field name", allFields.getName());   
        }   
    } catch (SecurityException e) {   
        // throw new RuntimeException(e.getMessage());   
        e.printStackTrace();   
    } catch (IllegalArgumentException e) {   
        // throw new RuntimeException(e.getMessage());   
        e.printStackTrace();   
    } catch (Exception e) {   
        // TODO Auto-generated catch block   
        e.printStackTrace();   
    }   
}  
static public void printAllInform(Class clsShow) {
  try {
   // 取得所有方法
   Method[] hideMethod = clsShow.getMethods();
   int i = 0;
   for (; i < hideMethod.length; i++) {
    Log.e("method name", hideMethod.getName());
   }
   // 取得所有常量
   Field[] allFields = clsShow.getFields();
   for (i = 0; i < allFields.length; i++) {
    Log.e("Field name", allFields.getName());
   }
  } catch (SecurityException e) {
   // throw new RuntimeException(e.getMessage());
   e.printStackTrace();
  } catch (IllegalArgumentException e) {
   // throw new RuntimeException(e.getMessage());
   e.printStackTrace();
  } catch (Exception e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
} 
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: 
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/**  
* 与设备配对 参考源码:platform/packages/apps/Settings.git  
* \Settings\src\com\android\settings\bluetooth\CachedBluetoothDevice.java  
*/  
static public boolean createBond(Class btClass,BluetoothDevice btDevice) throws Exception {   
    Method createBondMethod = btClass.getMethod("createBond");   
    Boolean returnValue = (Boolean) createBondMethod.invoke(btDevice);   
    return returnValue.booleanValue();   
}   
  
/**  
* 与设备解除配对 参考源码:platform/packages/apps/Settings.git  
* \Settings\src\com\android\settings\bluetooth\CachedBluetoothDevice.java  
*/  
static public boolean removeBond(Class btClass,BluetoothDevice btDevice) throws Exception {   
    Method removeBondMethod = btClass.getMethod("removeBond");   
    Boolean returnValue = (Boolean) removeBondMethod.invoke(btDevice);   
    return returnValue.booleanValue();   
}  
/**
  * 与设备配对 参考源码:platform/packages/apps/Settings.git
  * \Settings\src\com\android\settings\bluetooth\CachedBluetoothDevice.java
  */
static public boolean createBond(Class btClass,BluetoothDevice btDevice) throws Exception {
  Method createBondMethod = btClass.getMethod("createBond");
  Boolean returnValue = (Boolean) createBondMethod.invoke(btDevice);
  return returnValue.booleanValue();
} 
/**
  * 与设备解除配对 参考源码:platform/packages/apps/Settings.git
  * \Settings\src\com\android\settings\bluetooth\CachedBluetoothDevice.java
  */
static public boolean removeBond(Class btClass,BluetoothDevice btDevice) throws Exception {
  Method removeBondMethod = btClass.getMethod("removeBond");
  Boolean returnValue = (Boolean) removeBondMethod.invoke(btDevice);
  return returnValue.booleanValue();
} 
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:
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android:orientation="vertical" android:layout_width="fill_parent"
android:layout_height="fill_parent">
android:layout_height="wrap_content" android:layout_width="fill_parent">
android:text="Search" android:layout_width="160dip">
android:layout_width="160dip" android:text="Show" android:id="@+id/btnShow">
android:layout_width="wrap_content" android:layout_height="wrap_content">
android:layout_height="fill_parent">
android:orientation="vertical" android:layout_width="fill_parent"
android:layout_height="fill_parent">
android:layout_height="wrap_content" android:layout_width="fill_parent">
android:text="Search" android:layout_width="160dip">
android:layout_width="160dip" android:text="Show" android:id="@+id/btnShow">
android:layout_width="wrap_content" android:layout_height="wrap_content">
android:layout_height="fill_parent">
工具类ClsUtils.java源码如下: 
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package com.testReflect;   
  
import java.lang.reflect.Field;   
import java.lang.reflect.Method;   
  
import android.bluetooth.BluetoothDevice;   
import android.util.Log;   
  
public class ClsUtils {    
    /**  
     * 与设备配对 参考源码:platform/packages/apps/Settings.git  
     * \Settings\src\com\android\settings\bluetooth\CachedBluetoothDevice.java  
     */  
    static public boolean createBond(Class btClass,BluetoothDevice btDevice) throws Exception {   
        Method createBondMethod = btClass.getMethod("createBond");   
        Boolean returnValue = (Boolean) createBondMethod.invoke(btDevice);   
        return returnValue.booleanValue();   
    }   
  
    /**  
     * 与设备解除配对 参考源码:platform/packages/apps/Settings.git  
     * \Settings\src\com\android\settings\bluetooth\CachedBluetoothDevice.java  
     */  
    static public boolean removeBond(Class btClass,BluetoothDevice btDevice) throws Exception {   
        Method removeBondMethod = btClass.getMethod("removeBond");   
        Boolean returnValue = (Boolean) removeBondMethod.invoke(btDevice);   
        return returnValue.booleanValue();   
    }   
  
    /**  
     *   
     * @param clsShow  
     */  
    static public void printAllInform(Class clsShow) {   
        try {   
            // 取得所有方法   
            Method[] hideMethod = clsShow.getMethods();   
            int i = 0;   
            for (; i < hideMethod.length; i++) {   
                Log.e("method name", hideMethod.getName());   
            }   
            // 取得所有常量   
            Field[] allFields = clsShow.getFields();   
            for (i = 0; i < allFields.length; i++) {   
                Log.e("Field name", allFields.getName());   
            }   
        } catch (SecurityException e) {   
            // throw new RuntimeException(e.getMessage());   
            e.printStackTrace();   
        } catch (IllegalArgumentException e) {   
            // throw new RuntimeException(e.getMessage());   
            e.printStackTrace();   
        } catch (Exception e) {   
            // TODO Auto-generated catch block   
            e.printStackTrace();   
        }   
    }   
}  
package com.testReflect;import java.lang.reflect.Field;
import java.lang.reflect.Method;import android.bluetooth.BluetoothDevice;
import android.util.Log;public class ClsUtils { /**
  * 与设备配对 参考源码:platform/packages/apps/Settings.git
  * \Settings\src\com\android\settings\bluetooth\CachedBluetoothDevice.java
  */
static public boolean createBond(Class btClass,BluetoothDevice btDevice) throws Exception {
  Method createBondMethod = btClass.getMethod("createBond");
  Boolean returnValue = (Boolean) createBondMethod.invoke(btDevice);
  return returnValue.booleanValue();
} /**
  * 与设备解除配对 参考源码:platform/packages/apps/Settings.git
  * \Settings\src\com\android\settings\bluetooth\CachedBluetoothDevice.java
  */
static public boolean removeBond(Class btClass,BluetoothDevice btDevice) throws Exception {
  Method removeBondMethod = btClass.getMethod("removeBond");
  Boolean returnValue = (Boolean) removeBondMethod.invoke(btDevice);
  return returnValue.booleanValue();
} /**
  * 
  * @param clsShow
  */
static public void printAllInform(Class clsShow) {
  try {
   // 取得所有方法
   Method[] hideMethod = clsShow.getMethods();
   int i = 0;
   for (; i < hideMethod.length; i++) {
    Log.e("method name", hideMethod.getName());
   }
   // 取得所有常量
   Field[] allFields = clsShow.getFields();
   for (i = 0; i < allFields.length; i++) {
    Log.e("Field name", allFields.getName());
   }
  } catch (SecurityException e) {
   // throw new RuntimeException(e.getMessage());
   e.printStackTrace();
  } catch (IllegalArgumentException e) {
   // throw new RuntimeException(e.getMessage());
   e.printStackTrace();
  } catch (Exception e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
}
}
主程序testReflect.java的源码如下:view plaincopy to clipboardprint?
package com.testReflect;   
  
import java.util.ArrayList;   
import java.util.List;   
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.util.Log;   
import android.view.View;   
import android.widget.AdapterView;   
import android.widget.ArrayAdapter;   
import android.widget.Button;   
import android.widget.ListView;   
import android.widget.Toast;   
  
public class testReflect extends Activity {   
    Button btnSearch, btnShow;   
    ListView lvBTDevices;   
    ArrayAdapter adtDevices;   
    List lstDevices = new ArrayList();   
    BluetoothDevice btDevice;   
    BluetoothAdapter btAdapt;   
  
    @Override  
    public void onCreate(Bundle savedInstanceState) {   
        super.onCreate(savedInstanceState);   
        setContentView(R.layout.main);   
  
        btnSearch = (Button) this.findViewById(R.id.btnSearch);   
        btnSearch.setOnClickListener(new ClickEvent());   
        btnShow = (Button) this.findViewById(R.id.btnShow);   
        btnShow.setOnClickListener(new ClickEvent());   
  
        lvBTDevices = (ListView) this.findViewById(R.id.ListView01);   
        adtDevices = new ArrayAdapter(testReflect.this,   
                android.R.layout.simple_list_item_1, lstDevices);   
        lvBTDevices.setAdapter(adtDevices);   
        lvBTDevices.setOnItemClickListener(new ItemClickEvent());   
  
        btAdapt = BluetoothAdapter.getDefaultAdapter();// 初始化本机蓝牙功能   
        if (btAdapt.getState() == BluetoothAdapter.STATE_OFF)// 开蓝牙   
            btAdapt.enable();   
  
        // 注册Receiver来获取蓝牙设备相关的结果   
        IntentFilter intent = new IntentFilter();   
        intent.addAction(BluetoothDevice.ACTION_FOUND);   
        intent.addAction(BluetoothDevice.ACTION_BOND_STATE_CHANGED);   
        registerReceiver(searchDevices, intent);   
  
    }    
private BroadcastReceiver searchDevices = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
Bundle b = intent.getExtras();
Object[] lstName = b.keySet().toArray();
// 显示所有收到的消息及其细节
for (int i = 0; i 《 lstName.length; i++) {
String keyName = lstName[i].toString();
Log.e(keyName, String.valueOf(b.get(keyName)));
}
// 搜索设备时,取得设备的MAC地址
if (BluetoothDevice.ACTION_FOUND.equals(action)) {
BluetoothDevice device = intent
.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
if (device.getBondState() == BluetoothDevice.BOND_NONE) {
String str = “未配对|” + device.getName() + “|” + device.getAddress();
lstDevices.add(str); // 获取设备名称和mac地址
adtDevices.notifyDataSetChanged();
}
}
}
};
class ItemClickEvent implements AdapterView.OnItemClickListener {
@Override
public void onItemClick(AdapterView《?》 arg0, View arg1, int arg2,
long arg3) {
btAdapt.cancelDiscovery();
String str = lstDevices.get(arg2);
String[] values = str.split(“\\|”);
String address=values[2];
btDevice = btAdapt.getRemoteDevice(address);
try {
if(values[0].equals(“未配对”))
{
Toast.makeText(testReflect.this, “由未配对转为已配对”, 500).show();
ClsUtils.createBond(btDevice.getClass(), btDevice);
}
else if(values[0].equals(“已配对”))
{
Toast.makeText(testReflect.this, “由已配对转为未配对”, 500).show();
ClsUtils.removeBond(btDevice.getClass(), btDevice);
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
/**
* 按键处理
* @author GV
*
*/
class ClickEvent implements View.OnClickListener {
@Override
public void onClick(View v) {
if (v == btnSearch) {//搜索附近的蓝牙设备
lstDevices.clear();
Object[] lstDevice = btAdapt.getBondedDevices().toArray();
for (int i = 0; i 《 lstDevice.length; i++) {
BluetoothDevice device=(BluetoothDevice)lstDevice[i];
String str = “已配对|” + device.getName() + “|” + device.getAddress();
lstDevices.add(str); // 获取设备名称和mac地址
adtDevices.notifyDataSetChanged();
}
// 开始搜索
setTitle(“本机蓝牙地址:” + btAdapt.getAddress());
btAdapt.startDiscovery();
}
else if(v==btnShow){//显示BluetoothDevice的所有方法和常量,包括隐藏API
ClsUtils.printAllInform(btDevice.getClass());
}
}
}
}
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