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:
- static public void printAllInform(Class clsShow) {
- try {
-
- Method[] hideMethod = clsShow.getMethods();
- int i = 0;
- for (; i < hideMethod.length; i++) {
- Log.e("method name", hideMethod[i].getName());
- }
-
- Field[] allFields = clsShow.getFields();
- for (i = 0; i < allFields.length; i++) {
- Log.e("Field name", allFields[i].getName());
- }
- } catch (SecurityException e) {
-
- e.printStackTrace();
- } catch (IllegalArgumentException e) {
-
- e.printStackTrace();
- } catch (Exception e) {
-
- 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:
-
-
-
-
- static public boolean createBond(Class btClass,BluetoothDevice btDevice) throws Exception {
- Method createBondMethod = btClass.getMethod("createBond");
- Boolean returnValue = (Boolean) createBondMethod.invoke(btDevice);
- return returnValue.booleanValue();
- }
-
-
-
-
-
- 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:
- <?xml version="1.0" encoding="utf-8"?>
- <LinearLayout xmlns:android="http://schemas./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>
工具类ClsUtils.java源码如下:
- package com.testReflect;
-
- import java.lang.reflect.Field;
- import java.lang.reflect.Method;
-
- import android.bluetooth.BluetoothDevice;
- import android.util.Log;
-
- public class ClsUtils {
-
-
-
-
-
- static public boolean createBond(Class btClass,BluetoothDevice btDevice) throws Exception {
- Method createBondMethod = btClass.getMethod("createBond");
- Boolean returnValue = (Boolean) createBondMethod.invoke(btDevice);
- return returnValue.booleanValue();
- }
-
-
-
-
-
- static public boolean removeBond(Class btClass,BluetoothDevice btDevice) throws Exception {
- Method removeBondMethod = btClass.getMethod("removeBond");
- Boolean returnValue = (Boolean) removeBondMethod.invoke(btDevice);
- return returnValue.booleanValue();
- }
-
-
-
-
-
- static public void printAllInform(Class clsShow) {
- try {
-
- Method[] hideMethod = clsShow.getMethods();
- int i = 0;
- for (; i < hideMethod.length; i++) {
- Log.e("method name", hideMethod[i].getName());
- }
-
- Field[] allFields = clsShow.getFields();
- for (i = 0; i < allFields.length; i++) {
- Log.e("Field name", allFields[i].getName());
- }
- } catch (SecurityException e) {
-
- e.printStackTrace();
- } catch (IllegalArgumentException e) {
-
- e.printStackTrace();
- } catch (Exception e) {
-
- e.printStackTrace();
- }
- }
- }
主程序testReflect.java的源码如下:
- 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();
- if (btAdapt.getState() == BluetoothAdapter.STATE_OFF)
- btAdapt.enable();
-
-
- 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();
-
-
- for (int i = 0; i < lstName.length; i++) {
- String keyName = lstName[i].toString();
- Log.e(keyName, String.valueOf(b.get(keyName)));
- }
-
- 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);
- 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) {
-
- e.printStackTrace();
- }
- }
-
- }
-
-
-
-
-
-
- class ClickEvent implements View.OnClickListener {
-
- @Override
- public void onClick(View v) {
- if (v == btnSearch) {
- 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);
- adtDevices.notifyDataSetChanged();
- }
-
- setTitle("本机蓝牙地址:" + btAdapt.getAddress());
- btAdapt.startDiscovery();
- }
- else if(v==btnShow){
- ClsUtils.printAllInform(btDevice.getClass());
- }
-
- }
-
- }
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