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 {
    			// 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:

     

    /**
    	 * 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:

    14185743_prGO

    main.xml源码如下:

      <?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 {
        
        	/**
        	 * 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();
        		}
        	}
        }
        

         

         

        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();// 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());
          			}
          
          		}
          
          	}
          
          
          }

           

           


          原文链接:http://blog.csdn.net/hellogv/article/details/6042091

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