PhoneGap优化解决方案（续）

这份代码是直接继承WebView了，重载了其中的几个方法，至于为什么这样做时候，PhoneGap性能能得到比较明显的提升，不懂的可以看我前面的那篇文章。

至于如何使用这份代码，只要了解PhoneGap的同学想必都知道的，只需要使用一个WebViewPlus的实例来加载你自己的html地址即可。经过测试发现，其实这样的改进方案还是能一定程度上改善PhoneGap在Android上点击响应缓慢的问题的。

代码如下：

public class WebViewPlus extends WebView 
{
	public boolean optimizeShortPressEnabled = true;
	public boolean optimizeFlingEnabled = true;
	public boolean getMoving()
	{
		return (Boolean) this.getPrivateObject("mConfirmMove");
	}	
 
	public Handler getPrivateHandler()
	{
		return (Handler) this.getPrivateObject("mPrivateHandler");
	}
 
	public void OptimizedShortPress()
	{
		Handler handler = this.getPrivateHandler();
		if (handler.hasMessages(5))
			handler.removeMessages(5);
		Method method = this.getPrivateMethod("doShortPress", new Class[]{});
		this.invokeMethod(method);
	}
 
	public void OptimizedFling(MotionEvent ev)
	{
		Long lastTime = (Long) this.getPrivateObject("mLastTouchTime");
		if (ev.getEventTime() - lastTime > 250L)
		{
			this.setPrivateObject("mTouchMode", Integer.valueOf(3));
		}
	}
 
	public void Initialize()
	{
		optimizeShortPressEnabled = true;
		optimizeFlingEnabled = true;
	}
 
	public WebViewPlus(Context context) {
		super(context);
		this.Initialize();
	}
 
	public WebViewPlus(Context context, AttributeSet attrs) {
		super(context, attrs);
		this.Initialize();
	}
 
	public WebViewPlus(Context context, AttributeSet attrs, int defStyle) {
		super(context, attrs, defStyle);
		this.Initialize();
	}
 
	@Override
	public boolean onTouchEvent(MotionEvent ev)
	{
		if (optimizeFlingEnabled && getMoving())
		{
			this.OptimizedFling(ev);
		}
 
		boolean result = super.onTouchEvent(ev);
 
		if (optimizeShortPressEnabled && ev.getAction() == MotionEvent.ACTION_UP && !getMoving())
		{
			this.OptimizedShortPress();
		}
 
		return result;
	}
 
	public Method getPrivateMethod(String methodName, Class[] paramClasses)
	{
		return getPrivateMethod(this, methodName, paramClasses);
	}
 
	public static Method getPrivateMethod(Object objectClass, String methodName, Class[] paramClasses)
	{
		try {
			Method theMethod = objectClass.getClass().getSuperclass().getDeclaredMethod(methodName, paramClasses); 
			return theMethod;
		}
		catch (Exception e)
		{
			e.printStackTrace();
			return null;
		}
	}
 
	public Object invokeMethod(Method method, Object[] paramObjects)
	{
		return WebViewPlus.invokeMethod(this, method, paramObjects);
	}
 
	public Object invokeMethod(Method method)
	{
		return WebViewPlus.invokeMethod(this, method, new Object[] { });
	}
 
	public Object invokeMethod(String methodName)
	{
		try
		{
			Method method = this.getPrivateMethod(methodName, new Class[] { });
			method.setAccessible(true);
			return method.invoke(this, new Object[] { });
		}
		catch (Exception e)
		{
			e.printStackTrace();
			return null;
		}
	}
 
	public static Object invokeMethod(Object objectClass, Method method, Object[] paramObjects)
	{
		try
		{
			method.setAccessible(true);
			return method.invoke(objectClass, paramObjects);
		}
		catch (Exception e)
		{
			e.printStackTrace();
			return null;
		}
	}
 
	public Object getPrivateObject(String feildName)
	{
		return WebViewPlus.getPrivateObject(this, feildName);
	}
 
	public static Object getPrivateObject(Object objectClass, String feildName)
	{
		try
		{
			Field theFeild = objectClass.getClass().getSuperclass().getDeclaredField(feildName);
			theFeild.setAccessible(true);
			return theFeild.get(objectClass);
		}
		catch (Exception e)
		{
			e.printStackTrace();
			return null;
		}
	}
 
	public static void setPrivateObject(Object objectClass, String feildName, Object newValue)
	{
		try
		{
			Field theFeild = objectClass.getClass().getSuperclass().getDeclaredField(feildName);
			theFeild.setAccessible(true);
			theFeild.set(objectClass, newValue);
		}
		catch(Exception e)
		{
			e.printStackTrace();
		}
	}
 
	public void setPrivateObject(String feildName, Object newValue)
	{
		WebViewPlus.setPrivateObject(this, feildName, newValue);
	}
}