Android 中的 RatingBar 令人沮丧。

我关注了https://stackoverflow.com/a/13107765用我自己的drawable实现一个自定义评分栏，但是所有的星星只是相互叠加，所以最终只显示一个星星。

我一辈子都想不通为什么。

编辑:PNG 可绘制对象似乎工作正常，但是用作矢量可绘制对象的 SVG 会导致此问题

最佳答案

这是一个临时修复，直到他们在支持库中查看它(我也把它放在 gist https://gist.github.com/harrane/815e8a94d7ca75d964714228af69c60c 中)

public class RatingBarVectorFix extends RatingBar {

    private Bitmap mSampleTile;

    public RatingBarVectorFix(Context context) {
        this(context, null);
    }

    public RatingBarVectorFix(Context context, AttributeSet attrs) {
        this(context, attrs, android.support.v7.appcompat.R.attr.ratingBarStyle);
    }

    public RatingBarVectorFix(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init();
    }

    private void init() {
        LayerDrawable drawable = (LayerDrawable) tileify(getProgressDrawable(), false);
        drawable.findDrawableByLayerId(android.R.id.background).setColorFilter(backgroundTintColor, PorterDuff.Mode.SRC_ATOP);
        drawable.findDrawableByLayerId(android.R.id.progress).setColorFilter(progressTintColor, PorterDuff.Mode.SRC_ATOP);
        setProgressDrawable(drawable);
    }

    /**
     * Converts a drawable to a tiled version of itself. It will recursively
     * traverse layer and state list drawables.
     */
    private Drawable tileify(Drawable drawable, boolean clip) {
        if (drawable instanceof DrawableWrapper) {
            Drawable inner = ((DrawableWrapper) drawable).getWrappedDrawable();
            if (inner != null) {
                inner = tileify(inner, clip);
                ((DrawableWrapper) drawable).setWrappedDrawable(inner);
            }
        } else if (drawable instanceof LayerDrawable) {
            LayerDrawable background = (LayerDrawable) drawable;
            final int N = background.getNumberOfLayers();
            Drawable[] outDrawables = new Drawable[N];

            for (int i = 0; i < N; i++) {
                int id = background.getId(i);
                outDrawables[i] = tileify(background.getDrawable(i),
                        (id == android.R.id.progress || id == android.R.id.secondaryProgress));
            }
            LayerDrawable newBg = new LayerDrawable(outDrawables);

            for (int i = 0; i < N; i++) {
                newBg.setId(i, background.getId(i));
            }

            return newBg;

        } else if (drawable instanceof BitmapDrawable) {
            final BitmapDrawable bitmapDrawable = (BitmapDrawable) drawable;
            final Bitmap tileBitmap = bitmapDrawable.getBitmap();
            if (mSampleTile == null) {
                mSampleTile = tileBitmap;
            }

            final ShapeDrawable shapeDrawable = new ShapeDrawable(getDrawableShape());
            final BitmapShader bitmapShader = new BitmapShader(tileBitmap,
                    Shader.TileMode.REPEAT, Shader.TileMode.CLAMP);
            shapeDrawable.getPaint().setShader(bitmapShader);
            shapeDrawable.getPaint().setColorFilter(bitmapDrawable.getPaint().getColorFilter());
            return (clip) ? new ClipDrawable(shapeDrawable, Gravity.LEFT,
                    ClipDrawable.HORIZONTAL) : shapeDrawable;
        } else {
            return tileify(getBitmapDrawableFromVectorDrawable(drawable), clip);
        }

        return drawable;
    }

    private BitmapDrawable getBitmapDrawableFromVectorDrawable(Drawable drawable) {
        Bitmap bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(), Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(bitmap);
        drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
        drawable.draw(canvas);
        return new BitmapDrawable(getResources(), bitmap);
    }

    @Override
    protected synchronized void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        if (mSampleTile != null) {
            final int width = mSampleTile.getWidth() * getNumStars();
            setMeasuredDimension(ViewCompat.resolveSizeAndState(width, widthMeasureSpec, 0),
                    getMeasuredHeight());
        }
    }

    private Shape getDrawableShape() {
        final float[] roundedCorners = new float[]{5, 5, 5, 5, 5, 5, 5, 5};
        return new RoundRectShape(roundedCorners, null, null);
    }
}

关于android - RatingBar 自定义 Vector Drawables 叠加，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/34001823/