編輯:Android開發實例
上次講解Android的藍牙基本用法,這次講得深入些,探討下藍牙方面的隱藏API。用過Android系統設置(Setting)的人都知道藍牙搜索之後可以建立配對和解除配對,但是這兩項功能的函數沒有在SDK中給出,那麼如何去使用這兩項功能呢?本文利用JAVA的反射機制去調用這兩項功能對應的函數:createBond和removeBond,具體的發掘和實現步驟如下:
1.使用Git工具下載platform/packages/apps/Settings.git,在Setting源碼中查找關於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.如果枚舉發現API存在(SDK卻隱藏),則自己實現調用方法:
- /**
- * 與設備配對 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();
- }
PS:SDK之所以不給出隱藏的API肯定有其原因,也許是出於安全性或者是後續版本兼容性的考慮,因此不能保證隱藏API能在所有Android平台上很好地運行。。。
本文程序運行效果如下:
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來獲取藍牙設備相關的結果
- 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
- for (int i = 0; i < lstName.length; i++) {
- String keyName = lstName[i].toString();
- Log.e(keyName, String.valueOf(b.get(keyName)));
- }
- // 搜索設備時,取得設備的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("\\|");
- 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());
- }
- }
- }
- }
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