当然了，此时只是静态的，但是我们成功的完成了绘制一个静态图到FlodLayout。
接下来我们为其增加手指的触摸折叠功能。
六、TouchFoldLayout
1、实现
增加触摸功能其实很简单，我们的绘制依赖mFactor这个值，我们只要在onTouchEvent里面去累加手指移动距离，然后动态更新这个值就可以了。
package com.zhy.view;
import android.content.Context;
import android.graphics.Canvas;
import android.util.AttributeSet;
import android.view.GestureDetector;
import android.view.MotionEvent;
public class TouchFoldLayout extends FoldLayout
{
private GestureDetector mScrollGestureDetector;
public TouchFoldLayout(Context context, AttributeSet attrs)
{
super(context, attrs);
init(context, attrs);
}
public void init(Context context, AttributeSet attrs)
{
mScrollGestureDetector = new GestureDetector(context,
new ScrollGestureDetector());
}
@Override
public boolean onTouchEvent(MotionEvent event)
{
return mScrollGestureDetector.onTouchEvent(event);
}
private int mTranslation = -1;
@Override
protected void dispatchDraw(Canvas canvas)
{
if (mTranslation == -1)
mTranslation = getWidth();
super.dispatchDraw(canvas);
}
class ScrollGestureDetector extends GestureDetector.SimpleOnGestureListener
{
@Override
public boolean onDown(MotionEvent e)
{
return true;
}
@Override
public boolean onScroll(MotionEvent e1, MotionEvent e2,
float distanceX, float distanceY)
{
mTranslation -= distanceX;
if (mTranslation < 0)
{
mTranslation = 0;
}
if (mTranslation > getWidth())
{
mTranslation = getWidth();
}
float factor = Math.abs(((float) mTranslation)
/ ((float) getWidth()));
setFactor(factor);
return true;
}
}
}
我们选择继承FoldLayout，重写其onTouchEvent，然后通过mScrollGestureDetector获取移动的距离，最终和width做比值得到我们的factor，然后调用setFactor进行改变。
public void setFactor(float factor)
{
this.mFactor = factor;
updateFold();
invalidate();
}
