Android提高之探秘蓝牙隐藏API-AET-电子技术应用

Android提高之探秘蓝牙隐藏API

摘要：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？

关键词： 接口IC Android 蓝牙 API

Abstract：

Key words :

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:

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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[i].getName());
}
// 取得所有常量
Field[] allFields = clsShow.getFields();
for (i = 0; i < allFields.length; i++) {
Log.e("Field name", allFields[i].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[i].getName());
}
// 取得所有常量
Field[] allFields = clsShow.getFields();
for (i = 0; i < allFields.length; i++) {
Log.e("Field name", allFields[i].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: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: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 {

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:

结果如下：

3.如果枚举发现API存在(SDK却隐藏)，则自己实现调用方法：

本文程序运行效果如下：

main.xml源码如下：

工具类ClsUtils.java源码如下：

/**
* 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[i].getName());
}
// 取得所有常量
Field[] allFields = clsShow.getFields();
for (i = 0; i < allFields.length; i++) {
Log.e("Field name", allFields[i].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 {

/**
*
* @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[i].getName());
}
// 取得所有常量
Field[] allFields = clsShow.getFields();
for (i = 0; i < allFields.length; i++) {
Log.e("Field name", allFields[i].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：

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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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