ViewPager实现一屏多页 扇形翻页效果

ViewPager 一屏幕多页的方法 我刚学了两种 ，个人笔记 不喜勿喷：

 方法一：

ViewPager的适配器PagerAdapter自带的一个方法 返回值控制一屏多页效果，默认值是1.0：

实现一屏2页：

  public float getPageWidth(int position) {
        return (float) 0.5;
}

方法二：

   <android.support.v4.view.ViewPager
         android:id="@+id/viewPager"  
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:layout_marginLeft="130dp"
         android:layout_marginRight="130dp"
         android:fadingEdge="none"
         android:overScrollMode="never"
        >       
    </android.support.v4.view.ViewPager>

重点是控制 margin的距离，并且设置在父控件中设置ClipChildren=“false”来让其显示出来；

动画效果实现：实现PageTransformer

package com.example.testpager3;


import android.support.v4.view.ViewPager.PageTransformer;
import android.view.View;


public abstract class ABaseTransformer implements PageTransformer {

    private static final float ROT_MAX = 20.0f;  
    private float mRot;  


/**
* Called each {@link #transformPage(View, float)}.
* 
* @param view
* @param position
*/
// protected abstract void onTransform(View view, float position);


@Override
public void transformPage(View view, float position) {
onPreTransform(view, position);
onTransform(view, position);
onPostTransform(view, position);
}


/**
* If the position offset of a fragment is less than negative one or greater than one, returning true will set the
* visibility of the fragment to {@link View#GONE}. Returning false will force the fragment to {@link View#VISIBLE}.
* 
* @return
*/
protected boolean hideOffscreenPages() {
return true;
}


/**
* Indicates if the default animations of the view pager should be used.
* 
* @return
*/
protected boolean isPagingEnabled() {
return false;
}


/**
* Called each {@link #transformPage(View, float)} before {{@link #onTransform(View, float)} is called.
* 
* @param view
* @param position
*/
protected void onPreTransform(View view, float position) {


// TODO Auto-generated method stub
// final float width = view.getWidth();
// final float height = view.getHeight();
// final float rotation = ROT_MOD * position * -1.25f;
//
// view.setPivotX(0);
// view.setPivotY(height*0.5f);
// view.setRotation(rotation);
Log.e("TAG", view + " , " + position + "");  
 
       if (position < -1)  
       { // [-Infinity,-1)  
           // This page is way off-screen to the left.  
           ViewHelper.setRotation(view, 0);  
 
       } else if (position <= 1) // a页滑动至b页 ； a页从 0.0 ~ -1 ；b页从1 ~ 0.0  
       { // [-1,1]  
           // Modify the default slide transition to shrink the page as well  
           if (position < 0)  
           {  
 
               mRot = (ROT_MAX * position);  
               ViewHelper.setPivotX(view, view.getMeasuredWidth() * 1.0f);  
               ViewHelper.setPivotY(view, view.getMeasuredHeight()*0.6f);  
               ViewHelper.setRotation(view, mRot);  
           } else  
           {  
 
               mRot = (ROT_MAX * position);  
               ViewHelper.setPivotX(view, -view.getMeasuredWidth() * 0);  
               ViewHelper.setPivotY(view, view.getMeasuredHeight()*0.6f);  
               ViewHelper.setRotation(view, mRot);  
           }  
 
           // Scale the page down (between MIN_SCALE and 1)  
 
           // Fade the page relative to its size.  
 
       } else  
       { // (1,+Infinity]  
           // This page is way off-screen to the right.  
           ViewHelper.setRotation(view, 0);  
       }  

}


/**
* Called each {@link #transformPage(View, float)} call after {@link #onTransform(View, float)} is finished.
* 
* @param view
* @param position
*/
protected void onPostTransform(View view, float position) {
}


}

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