坚向的ViewPager，上下滑动的组件，android上下滑动 VerticalPager

package com.zhulin.android.atools;

import android.content.Context;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.VelocityTracker;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.Interpolator;
import android.widget.Scroller;
import android.widget.Toast;

public class VerticalPager extends ViewGroup{

  private Scroller mScroller;
  private Context mContext;
  public VerticalPager(Context context, AttributeSet attrs) {
    super(context, attrs);
    this.mContext=context;
    mScroller=new Scroller(context);
//    mScroller=new Scroller(mContext, new Interpolator() {
//      
//      @Override
//      public float getInterpolation(float input) {
//        return 300;
//      }
//    });

  }

  @Override
  protected void onLayout(boolean changed, int l, int t, int r, int b) {
    int totalHeight=0;
    int count=getChildCount();

    for(int i=0;i<count;i++){
      View childView=getChildAt(i);

      //      int measureHeight=childView.getMeasuredHeight();
      //      int measureWidth=childView.getMeasuredWidth();

      childView.layout(l, totalHeight, r, totalHeight+b);

      totalHeight+=b;
    }
  }

  private VelocityTracker mVelocityTracker;

  @Override
  protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    int width=MeasureSpec.getSize(widthMeasureSpec);
    int height=MeasureSpec.getSize(heightMeasureSpec);


    int count=getChildCount();
    for(int i=0;i<count;i++){
      getChildAt(i).measure(width, height);
    }
    setMeasuredDimension(width, height);
  }


  private int mLastMotionY;
  @Override
  public boolean onTouchEvent(MotionEvent event) {
    if(mVelocityTracker==null){
      mVelocityTracker=VelocityTracker.obtain();
    }
    mVelocityTracker.addMovement(event);

    int action=event.getAction();

    float y=event.getY();

    switch(action){
    case MotionEvent.ACTION_DOWN:
      if(!mScroller.isFinished()){
        mScroller.abortAnimation();
      }
      mLastMotionY=(int) y;

      Log.d("montion", ""+getScrollY());
      break;
    case MotionEvent.ACTION_MOVE:
      int deltaY=(int) (mLastMotionY-y);
        scrollBy(0,deltaY);
      //mScroller.startScroll(0, getScrollY(), 0, deltaY);
      invalidate();

      mLastMotionY=(int) y;
      break;
    case MotionEvent.ACTION_UP:
      if(mVelocityTracker!=null){
        mVelocityTracker.recycle();
        mVelocityTracker=null;
      }

      if(getScrollY()<0){
        mScroller.startScroll(0, -400, 0, 400);
      }else if(getScrollY()>(getHeight()*(getChildCount()-1))){
        View lastView=getChildAt(getChildCount()-1);

        mScroller.startScroll(0,lastView.getTop()+300, 0, -300);
      }else{
        int position=getScrollY()/getHeight();
        int mod=getScrollY()%getHeight();


        if(mod>getHeight()/3){
          View positionView=getChildAt(position+1);
          mScroller.startScroll(0, positionView.getTop()-300, 0, +300);
        }else{
          View positionView=getChildAt(position);
          mScroller.startScroll(0, positionView.getTop()+300, 0, -300);
        }


      }
      invalidate();
      break;
//    case MotionEvent.ACTION_MASK:
//      if(getScrollY()<0){
//        mScroller.startScroll(0, 0, 0, 0);
//      }else if(getScrollY()>(getHeight()*(getChildCount()-1)){
//      }
//      invalidate();
//      break;
    }

    return true;
  }

  @Override
  public void computeScroll() {
    super.computeScroll();

    if(mScroller.computeScrollOffset()){
      scrollTo(0, mScroller.getCurrY());
    }else{

    }
  }

}

xml布局

<?xml version="1.0" encoding="UTF-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <com.zhulin.android.atools.VerticalPager
        android:id="@+id/vertyPager1"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" >

        <TextView
            android:background="@drawable/a1"
            android:id="@+id/textView1"
            android:layout_width="match_parent"
            android:layout_height="100dp"
            android:text="TextView1111" />

        <TextView
             android:background="@drawable/a2"
            android:id="@+id/textView2"
            android:layout_width="fill_parent"
            android:layout_height="100dp"
            android:text="TextView2222" />

         <TextView
             android:background="@drawable/a3"
            android:id="@+id/textView3"
            android:layout_width="fill_parent"
            android:layout_height="100dp"
            android:text="TextView2222" />

          <TextView
             android:background="@drawable/a4"
            android:id="@+id/textView4"
            android:layout_width="fill_parent"
            android:layout_height="100dp"
            android:text="TextView2222" />
    </com.zhulin.android.atools.VertyPager>

</LinearLayout>