Android Nougat clipPath在动画期间无法正常工作

Question

我建立了我的画布圆形夹路径,我有一列数字是在画布上的动画,所以我看到的数字在截取的部分动画和动画出来.这是剪辑的代码:

mClipPath.addCircle((w / 2f), (h / 2f), radius, Path.Direction.CW); 
canvas.clipPath(mClipPath, Region.Op.INTERSECT);

如您所见,0表示动画,1表示动画(右侧的数字).

但在某些情况下,剪辑在动画期间不会正确发生(左边的3和4).

这只发生在牛轧糖上.

Answer 1

我看到同样的问题。在滚动包含下面的 CircleCropDrawable 的 RecyclerView 时，我可以看到根据滚动位置，在剪辑和未剪辑之间的可绘制闪烁。

然而，通过反复试验，我发现这种情况仅在路径与可绘制对象的边缘相交时发生。将半径减小 1dp 可以解决该问题（小于 1dp 不起作用）

CircleCropDrawable.java

package com.someone.android.view;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.ColorFilter;
import android.graphics.Path;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.support.annotation.NonNull;
import android.util.TypedValue;

public class CircleCropDrawable extends Drawable {

    private final Context mContext;
    private final Drawable mDrawable;

    public CircleCropDrawable(Context context, Drawable drawable) {
        mContext = context;
        this.mDrawable = drawable;
    }

    @Override
    public void draw(@NonNull Canvas canvas) {
        final float width = getBounds().width();
        final float height = getBounds().height();
        final Path path = new Path();
        // There seems to be a bug in N where the clip path doesn't work when animating
        // without a 1dp reduction in radius, the drawable unclips when scrolling in a RecyclerView
        float inset = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 2, mContext.getResources().getDisplayMetrics());
        path.addCircle(width / 2, height / 2, Math.min(width / 2, height / 2) - inset, Path.Direction.CW);
        canvas.clipPath(path);
        mDrawable.draw(canvas);
    }

    @Override
    protected void onBoundsChange(Rect bounds) {
        mDrawable.setBounds(bounds);
    }

    @Override
    public int getIntrinsicWidth() {
        return mDrawable.getIntrinsicWidth();
    }

    @Override
    public int getIntrinsicHeight() {
        return mDrawable.getIntrinsicHeight();
    }


    @Override
    public void setAlpha(int i) {
        mDrawable.setAlpha(i);
    }

    @Override
    public void setColorFilter(ColorFilter colorFilter) {
        mDrawable.setColorFilter(colorFilter);
    }

    @Override
    public int getOpacity() {
        return mDrawable.getOpacity();
    }
}