Android提高之藍牙隱藏API探秘
前面文章講解了Android的藍牙基本用法,本文講得深入些,探討下藍牙方面的隱藏API。用過Android系統(tǒng)設(shè)置(Setting)的人都知道藍牙搜索之后可以建立配對和解除配對,但是這兩項功能的函數(shù)沒有在SDK中給出,那么如何去使用這兩項功能呢?本文利用JAVA的反射機制去調(diào)用這兩項功能對應(yīng)的函數(shù):createBond和removeBond,具體的發(fā)掘和實現(xiàn)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(guān)于建立配對和解除配對的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:
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();
}
}
結(jié)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(fā)現(xiàn)API存在(SDK卻隱藏),則自己實現(xiàn)調(diào)用方法:
/**
* 與設(shè)備配對 參考源碼: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();
}
/**
* 與設(shè)備解除配對 參考源碼: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();
}
此處注意:SDK之所以不給出隱藏的API肯定有其原因,也許是出于安全性或者是后續(xù)版本兼容性的考慮,因此不能保證隱藏API能在所有Android平臺上很好地運行。
本文程序運行效果如下圖所示:

main.xml源碼如下:
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <LinearLayout android:id="@+id/LinearLayout01" android:layout_height="wrap_content" android:layout_width="fill_parent"> <Button android:layout_height="wrap_content" android:id="@+id/btnSearch" android:text="Search" android:layout_width="160dip"></Button> <Button android:layout_height="wrap_content" android:layout_width="160dip" android:text="Show" android:id="@+id/btnShow"></Button> </LinearLayout> <LinearLayout android:id="@+id/LinearLayout02" android:layout_width="wrap_content" android:layout_height="wrap_content"></LinearLayout> <ListView android:id="@+id/ListView01" android:layout_width="fill_parent" android:layout_height="fill_parent"> </ListView> </LinearLayout>
工具類ClsUtils.java源碼如下:
package com.testReflect;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import android.bluetooth.BluetoothDevice;
import android.util.Log;
public class ClsUtils {
/**
* 與設(shè)備配對 參考源碼: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();
}
/**
* 與設(shè)備解除配對 參考源碼: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();
}
}
}
主程序testReflect.java的源碼如下:
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<String> adtDevices;
List<String> lstDevices = new ArrayList<String>();
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<String>(testReflect.this,
android.R.layout.simple_list_item_1, lstDevices);
lvBTDevices.setAdapter(adtDevices);
lvBTDevices.setOnItemClickListener(new ItemClickEvent());
btAdapt = BluetoothAdapter.getDefaultAdapter();// 初始化本機藍牙功能
if (btAdapt.getState() == BluetoothAdapter.STATE_OFF)// 開藍牙
btAdapt.enable();
// 注冊Receiver來獲取藍牙設(shè)備相關(guān)的結(jié)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();
// 顯示所有收到的消息及其細節(jié)
for (int i = 0; i < lstName.length; i++) {
String keyName = lstName[i].toString();
Log.e(keyName, String.valueOf(b.get(keyName)));
}
// 搜索設(shè)備時,取得設(shè)備的MAC地址
if (BluetoothDevice.ACTION_FOUND.equals(action)) {
BluetoothDevice device = intent
.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
if (device.getBondState() == BluetoothDevice.BOND_NONE) {
String str = "未配對|" + device.getName() + "|" + device.getAddress();
lstDevices.add(str); // 獲取設(shè)備名稱和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("http://|");
String address=values[2];
btDevice = btAdapt.getRemoteDevice(address);
try {
if(values[0].equals("未配對"))
{
Toast.makeText(testReflect.this, "由未配對轉(zhuǎn)為已配對", 500).show();
ClsUtils.createBond(btDevice.getClass(), btDevice);
}
else if(values[0].equals("已配對"))
{
Toast.makeText(testReflect.this, "由已配對轉(zhuǎn)為未配對", 500).show();
ClsUtils.removeBond(btDevice.getClass(), btDevice);
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
/**
* 按鍵處理
* @author GV
*
*/
class ClickEvent implements View.OnClickListener {
@Override
public void onClick(View v) {
if (v == btnSearch) {//搜索附近的藍牙設(shè)備
lstDevices.clear();
Object[] lstDevice = btAdapt.getBondedDevices().toArray();
for (int i = 0; i < lstDevice.length; i++) {
BluetoothDevice device=(BluetoothDevice)lstDevice[i];
String str = "已配對|" + device.getName() + "|" + device.getAddress();
lstDevices.add(str); // 獲取設(shè)備名稱和mac地址
adtDevices.notifyDataSetChanged();
}
// 開始搜索
setTitle("本機藍牙地址:" + btAdapt.getAddress());
btAdapt.startDiscovery();
}
else if(v==btnShow){//顯示BluetoothDevice的所有方法和常量,包括隱藏API
ClsUtils.printAllInform(btDevice.getClass());
}
}
}
}
希望本文實例能夠?qū)Υ蠹疫M行Android程序開發(fā)有一定的借鑒幫助作用。
- android 微信 sdk api調(diào)用不成功解決方案
- android monkey自動化測試改為java調(diào)用monkeyrunner Api
- Android 高版本API方法在低版本系統(tǒng)上的兼容性處理
- Android 調(diào)用百度地圖API示例
- android開發(fā)教程之獲取使用當(dāng)前api的應(yīng)用程序名稱
- android通過google api獲取天氣信息示例
- android通過Location API顯示地址信息的實現(xiàn)方法
- Android通過原生APi獲取所在位置的經(jīng)緯度
- Android指紋識別API初試
- Android開發(fā)學(xué)習(xí)筆記之通過API接口將LaTex數(shù)學(xué)函數(shù)表達式轉(zhuǎn)化為圖片形式
- Android 支付寶支付、微信支付、銀聯(lián)支付 整合第三方支付接入方法(后臺訂單支付API設(shè)計)
- Android4.4 WebAPI實現(xiàn)拍照上傳功能
- 使用android隱藏api實現(xiàn)亮度調(diào)節(jié)的方法
- Android API開發(fā)之SMS短信服務(wù)處理和獲取聯(lián)系人的方法
- Android 用 camera2 API 自定義相機
- Android基于API的Tabs3實現(xiàn)仿優(yōu)酷t(yī)abhost效果實例
- Android 多媒體播放API簡單實例
- 最新Android版本、代號、對應(yīng)API/NDK級別、發(fā)布時間及市場份額
相關(guān)文章
Android中使用ContentProvider管理系統(tǒng)資源的實例
這篇文章主要介紹了Android中使用ContentProvider管理系統(tǒng)資源的實例,講解了ContentProvider對系統(tǒng)中聯(lián)系人及多媒體資源的管理例子,需要的朋友可以參考下2016-04-04
ContentProvider客戶端處理provider邏輯分析
這篇文章主要為大家介紹了ContentProvider客戶端處理provider邏輯分析,有需要的朋友可以借鑒參考下,希望能夠有所幫助,祝大家多多進步,早日升職加薪2022-10-10
Android多功能時鐘開發(fā)案例(基礎(chǔ)篇)
這篇文章主要為大家詳細介紹了Android多功能時鐘開發(fā)案例的基礎(chǔ)知識,為開發(fā)Android時鐘打下基礎(chǔ),具有一定的參考價值,感興趣的小伙伴們可以參考一下2016-05-05
Android?kotlin?跳轉(zhuǎn)手機熱點開關(guān)頁面和判斷熱點是否打開(親測可用)
跳轉(zhuǎn)手機熱點的頁面肯定是用intent,重點是action不知道是什么,網(wǎng)上最常見的就是Settings.ACTION_WIFI_SETTINGS 跳轉(zhuǎn)wifi設(shè)置頁面,本文介紹Android?kotlin?跳轉(zhuǎn)手機熱點開關(guān)頁面和判斷熱點是否打開,感興趣的朋友一起看看吧2023-08-08
Kotlin如何優(yōu)雅地判斷EditText數(shù)據(jù)是否為空詳解
這篇文章主要給大家介紹了關(guān)于Kotlin如何優(yōu)雅地判斷EditText數(shù)據(jù)是否為空的相關(guān)資料,文中通過示例代碼介紹的非常詳細,對大家學(xué)習(xí)或者使用kotlin具有一定的參考學(xué)習(xí)價值,需要的朋友們下面隨著小編來一起學(xué)習(xí)學(xué)習(xí)吧2018-08-08
Android Surfaceview的繪制與應(yīng)用
這篇文章主要介紹了Android Surfaceview的繪制與應(yīng)用的相關(guān)資料,需要的朋友可以參考下2017-07-07

