如何在Android中创建bouncable滚动视图？ [英] How to create bouncable scrollview in android?

问题描述

如何在Android中创建的反弹滚动视图iPhone一样？

How to create bounce scroll view in android like iPhone?

推荐答案

添加效果反弹，以滚动型的机器人

Add effect bounce to scrollview in android

第1步：创建包com.base.view新文件BounceScrollView

Step 1: Create new file BounceScrollView in package com.base.view

public class BounceScrollView extends ScrollView
{
    private static final int MAX_Y_OVERSCROLL_DISTANCE = 200;

    private Context mContext;
    private int mMaxYOverscrollDistance;

    public BounceScrollView(Context context) 
    {
        super(context);
        mContext = context;
        initBounceScrollView();
    }

    public BounceScrollView(Context context, AttributeSet attrs) 
    {
        super(context, attrs);
        mContext = context;
        initBounceScrollView();
    }

    public BounceScrollView(Context context, AttributeSet attrs, int defStyle) 
    {
        super(context, attrs, defStyle);
        mContext = context;
        initBounceScrollView();
    }

    private void initBounceScrollView()
    {
        //get the density of the screen and do some maths with it on the max overscroll distance
        //variable so that you get similar behaviors no matter what the screen size

        final DisplayMetrics metrics = mContext.getResources().getDisplayMetrics();
            final float density = metrics.density;

        mMaxYOverscrollDistance = (int) (density * MAX_Y_OVERSCROLL_DISTANCE);
    }

    @Override
    protected boolean overScrollBy(int deltaX, int deltaY, int scrollX, int scrollY, int scrollRangeX, int scrollRangeY, int maxOverScrollX, int maxOverScrollY, boolean isTouchEvent) 
    { 
        //This is where the magic happens, we have replaced the incoming maxOverScrollY with our own custom variable mMaxYOverscrollDistance; 
        return super.overScrollBy(deltaX, deltaY, scrollX, scrollY, scrollRangeX, scrollRangeY, maxOverScrollX, mMaxYOverscrollDistance, isTouchEvent);  
    }

}

第二步：在你的布局，请修改

Step 2: At your layout, please change

<ScrollView 
   android:id="@+id/list"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
/>

到

<com.base.view.BounceScrollView 
   android:id="@+id/list"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
/>

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