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 plain print ?

staticpublicvoidprintAllInform(ClassclsShow){
try{
//取得所有方法
Method[]hideMethod=clsShow.getMethods();
inti=0;
for(;i<hideMethod.length;i++){
Log.e("methodname",hideMethod[i].getName());
}
//取得所有常量
Field[]allFields=clsShow.getFields();
for(i=0;i<allFields.length;i++){
Log.e("Fieldname",allFields[i].getName());
}
}catch(SecurityExceptione){
//thrownewRuntimeException(e.getMessage());
e.printStackTrace();
}catch(IllegalArgumentExceptione){
//thrownewRuntimeException(e.getMessage());
e.printStackTrace();
}catch(Exceptione){
//TODOAuto-generatedcatchblock
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：

view plain print ?

/**
*与设备配对参考源码：platform/packages/apps/Settings.git
*/Settings/src/com/android/settings/bluetooth/CachedBluetoothDevice.java
*/
staticpublicbooleancreateBond(ClassbtClass,BluetoothDevicebtDevice)throwsException{
MethodcreateBondMethod=btClass.getMethod("createBond");
BooleanreturnValue=(Boolean)createBondMethod.invoke(btDevice);
returnreturnValue.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
*/
staticpublicbooleanremoveBond(ClassbtClass,BluetoothDevicebtDevice)throwsException{
MethodremoveBondMethod=btClass.getMethod("removeBond");
BooleanreturnValue=(Boolean)removeBondMethod.invoke(btDevice);
returnreturnValue.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：

view plain print ?

<?xmlversion="1.0"encoding="utf-8"?>
<LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"android:layout_width="fill_parent"
android:layout_height="fill_parent">
<LinearLayoutandroid:id="@+id/LinearLayout01"
android:layout_height="wrap_content"android:layout_width="fill_parent">
<Buttonandroid:layout_height="wrap_content"android:id="@+id/btnSearch"
android:text="Search"android:layout_width="160dip"></Button>
<Buttonandroid:layout_height="wrap_content"
android:layout_width="160dip"android:text="Show"android:id="@+id/btnShow"></Button>
</LinearLayout>
<LinearLayoutandroid:id="@+id/LinearLayout02"
android:layout_width="wrap_content"android:layout_height="wrap_content"></LinearLayout>
<ListViewandroid:id="@+id/ListView01"android:layout_width="fill_parent"
android:layout_height="fill_parent">
</ListView>
</LinearLayout>

工具类ClsUtils.java源码如下：

view plain print ?

packagecom.testReflect;
importjava.lang.reflect.Field;
importjava.lang.reflect.Method;
importandroid.bluetooth.BluetoothDevice;
importandroid.util.Log;
publicclassClsUtils{
/**
*与设备配对参考源码：platform/packages/apps/Settings.git
*/Settings/src/com/android/settings/bluetooth/CachedBluetoothDevice.java
*/
staticpublicbooleancreateBond(ClassbtClass,BluetoothDevicebtDevice)throwsException{
MethodcreateBondMethod=btClass.getMethod("createBond");
BooleanreturnValue=(Boolean)createBondMethod.invoke(btDevice);
returnreturnValue.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
*/
staticpublicbooleanremoveBond(ClassbtClass,BluetoothDevicebtDevice)throwsException{
MethodremoveBondMethod=btClass.getMethod("removeBond");
BooleanreturnValue=(Boolean)removeBondMethod.invoke(btDevice);
returnreturnValue.booleanValue();
}
/**
*
*@paramclsShow
*/
staticpublicvoidprintAllInform(ClassclsShow){
try{
//取得所有方法
Method[]hideMethod=clsShow.getMethods();
inti=0;
for(;i<hideMethod.length;i++){
Log.e("methodname",hideMethod[i].getName());
}
//取得所有常量
Field[]allFields=clsShow.getFields();
for(i=0;i<allFields.length;i++){
Log.e("Fieldname",allFields[i].getName());
}
}catch(SecurityExceptione){
//thrownewRuntimeException(e.getMessage());
e.printStackTrace();
}catch(IllegalArgumentExceptione){
//thrownewRuntimeException(e.getMessage());
e.printStackTrace();
}catch(Exceptione){
//TODOAuto-generatedcatchblock
e.printStackTrace();
}
}
}

主程序testReflect.java的源码如下：

view plain print ?

packagecom.testReflect;
importjava.util.ArrayList;
importjava.util.List;
importandroid.app.Activity;
importandroid.bluetooth.BluetoothAdapter;
importandroid.bluetooth.BluetoothDevice;
importandroid.content.BroadcastReceiver;
importandroid.content.Context;
importandroid.content.Intent;
importandroid.content.IntentFilter;
importandroid.os.Bundle;
importandroid.util.Log;
importandroid.view.View;
importandroid.widget.AdapterView;
importandroid.widget.ArrayAdapter;
importandroid.widget.Button;
importandroid.widget.ListView;
importandroid.widget.Toast;
publicclasstestReflectextendsActivity{
ButtonbtnSearch,btnShow;
ListViewlvBTDevices;
ArrayAdapter<String>adtDevices;
List<String>lstDevices=newArrayList<String>();
BluetoothDevicebtDevice;
BluetoothAdapterbtAdapt;
@Override
publicvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
btnSearch=(Button)this.findViewById(R.id.btnSearch);
btnSearch.setOnClickListener(newClickEvent());
btnShow=(Button)this.findViewById(R.id.btnShow);
btnShow.setOnClickListener(newClickEvent());
lvBTDevices=(ListView)this.findViewById(R.id.ListView01);
adtDevices=newArrayAdapter<String>(testReflect.this,
android.R.layout.simple_list_item_1,lstDevices);
lvBTDevices.setAdapter(adtDevices);
lvBTDevices.setOnItemClickListener(newItemClickEvent());
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
IntentFilterintent=newIntentFilter();
intent.addAction(BluetoothDevice.ACTION_FOUND);
intent.addAction(BluetoothDevice.ACTION_BOND_STATE_CHANGED);
registerReceiver(searchDevices,intent);
}
privateBroadcastReceiversearchDevices=newBroadcastReceiver(){
publicvoidonReceive(Contextcontext,Intentintent){
Stringaction=intent.getAction();
Bundleb=intent.getExtras();
Object[]lstName=b.keySet().toArray();
//显示所有收到的消息及其细节
for(inti=0;i<lstName.length;i++){
StringkeyName=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)){
BluetoothDevicedevice=intent
.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
if(device.getBondState()==BluetoothDevice.BOND_NONE){
Stringstr="未配对|"+device.getName()+"|"+device.getAddress();
lstDevices.add(str);//获取设备名称和mac地址
adtDevices.notifyDataSetChanged();
}
}
}
};
classItemClickEventimplementsAdapterView.OnItemClickListener{
@Override
publicvoidonItemClick(AdapterView<?>arg0,Viewarg1,intarg2,
longarg3){
btAdapt.cancelDiscovery();
Stringstr=lstDevices.get(arg2);
String[]values=str.split("//|");
Stringaddress=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);
}
elseif(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(Exceptione){
//TODOAuto-generatedcatchblock
e.printStackTrace();
}
}
}
/**
*按键处理
*@authorGV
*
*/
classClickEventimplementsView.OnClickListener{
@Override
publicvoidonClick(Viewv){
if(v==btnSearch){//搜索附近的蓝牙设备
lstDevices.clear();
Object[]lstDevice=btAdapt.getBondedDevices().toArray();
for(inti=0;i<lstDevice.length;i++){
BluetoothDevicedevice=(BluetoothDevice)lstDevice[i];
Stringstr="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();
}
elseif(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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