挑战:ViewPager的自定义动画.更改所选元素的高度(查看折页) [英] Challenge: Custom Animation of ViewPager. Change height of chosen elements (View fold)

问题描述

我目前正在研究在ViewPager中切换页面之间的自定义动画.当我向左滑动时，View向左移动，而从它的下方，新View移到了前面.我想制作一个视图，该视图向左移动(我配置了)以像下面的图像一样缩小:

I am currently working on custom animation between switching pages in ViewPager. When I slide to the left, View is moving to the left and from below of it new View is coming to the front. I would like to make the view, that moves to the left (that I dispose) to shrink like on the folowing images:

在第二张和第三张图像上，我没有想象新的View出现在最前面，但是我认为这不是必需的.您是否知道如何修改代码?

我想更改TableLayout，RelativeLayout和FrameLayout的高度，并保持两个TextView的高度.另外，我还必须更改整个视图的X位置.

我期待您的创意答案(代码).下面，我附上我的动画代码.

On the second and third image I didn't picture new View coming to the front, but I think it wasn't necessary. Do you have any idea how can I modify the code?

I would like to change height of TableLayout, RelativeLayout and FrameLayout and keep the height of both TextViews. Also I would have to change X-position of the whole View.

I am looking forward for your creative answers (code). Below I attach my code for the animation.

import android.view.View;
import android.widget.RelativeLayout;
import android.annotation.SuppressLint;
import android.support.v4.view.ViewPager.PageTransformer;

public class DepthPageTransformer implements PageTransformer {
    private static float MIN_SCALE = 0.75f;

    @SuppressLint("NewApi")
    public void transformPage(View view, float position) {
        int pageWidth = view.getWidth();

        if (position < -1) { // [-Infinity,-1)
            // This page is way off-screen to the left.
            view.setAlpha(0);

        } else if (position <= 0) { // [-1,0]
            // Use the default slide transition when moving to the left page
            view.setTranslationX(0);
            view.setScaleX(1);
            view.setScaleY(1);
            //float scaleFactor = (1 - Math.abs(position));

            //WHAT TO PUT HERE TO ARCHIVE MY GOAL??

            //This is how I can get particular layouts:
            // RelativeLayout relativeLayout = (RelativeLayout) view.findViewById(R.id.fragment_object_canvas_RelativeLayout1);
            //relativeLayout.setScaleX(scaleFactor);
            //relativeLayout.setScaleY(scaleFactor);

        } else if (position <= 1) { // (0,1]
            // Fade the page out.
            view.setAlpha(1 - position);

            // Counteract the default slide transition
            view.setTranslationX(pageWidth * -position);
            //view.setRotation(1 - (position*360));

            // Scale the page down (between MIN_SCALE and 1)
            float scaleFactor = MIN_SCALE
                    + (1 - MIN_SCALE) * (1 - Math.abs(position));
            view.setScaleX(scaleFactor);
            view.setScaleY(scaleFactor);

        } else { // (1,+Infinity]
            // This page is way off-screen to the right.
            view.setAlpha(0);
        }
    }
}

更新:

我可以使用以下代码在整个View的高度上进行操作(目前只能执行此操作):

I can manipulate with height of whole View (for now I can do only this) with the following code:

  LinearLayout relativeLayout = (LinearLayout) view.findViewById(R.id.fragment_object_canvas_linearLayout1);
            relativeLayout.setLayoutParams(new FrameLayout.LayoutParams(relativeLayout.getWidth(), NEW_HEIGHT_HERE)));

但是，我不确定应该将什么放入NEW_HEIGHT_HERE变量中以使其完全起作用...

However, I am not sure what should I put into NEW_HEIGHT_HERE variable to make it work corectly...

推荐答案

尝试使用位置浮动变量. 获取布局的高度并...:

try to work with a position float variable. Get the height of your layout and...:

relativeLayout.setLayoutParams(....,position*height+height)

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