java - 如何在Android中创建可启动的scrollview？

如何在Android(如iPhone)中创建弹跳ScrollView？

最佳答案

在Android中的滚动 View 中添加效果弹跳

步骤1 :在com.base.view包中创建新文件BounceScrollView

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);
    }

}

步骤2:在您的布局中，请更改

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

至

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

关于java - 如何在Android中创建可启动的scrollview？，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/7470267/