android —— 自定义控件 竖向的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
[java] view plaincopy
<?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>