android-layout - Android RatingBar 大小

Question

我想制作一个评级栏，它可以在给定的任何尺寸下正常工作和显示。

Android 默认的 RatingBar 无法缩放，我看到的任何其他解决方案都是通过预定义的可绘制对象减少或增加 RatingBar 的大小。

有什么方法可以让 RatingBar 适应给定的维度并适应任何维度？

Answer 1

是的，通过创建一个类似于 RatingBar 的新小部件。

有一些问题。

• 剪切路径没有AA
• 而且星星的坐标也不理想

但这些问题可以很容易地解决。 这是新的 RatingBar 小部件的代码。

您可以根据需要创建任意数量的 starNumber，它们会适应其布局尺寸。

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Path;
import android.util.AttributeSet;
import android.widget.SeekBar;

public class PRatingBar extends SeekBar {

    private int starNumber = 5;
    private float space;
    private int rating;
    private boolean firstTime = true;

    public PRatingBar(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        _init();
    }

    public PRatingBar(Context context, AttributeSet attrs) {
        super(context, attrs);
        _init();
    }

    public PRatingBar(Context context) {
        super(context);
        _init();

    }

    /**
     * @return the rating
     */
    public int getRating() {
        return rating;
    }

    /**
     * Sets the number of stars
     * 
     * @param starNumber
     */
    public void setStarNumber(int starNumber) {
        this.starNumber = starNumber;
    }

    private void _init() {
        setThumb(null);
        setOnSeekBarChangeListener(sbcl);
        post(new Runnable() {

            @Override
            public void run() {
                setProgress((int) space);
            }
        });
    }

    OnSeekBarChangeListener sbcl = new OnSeekBarChangeListener() {

        @Override
        public void onStopTrackingTouch(SeekBar seekBar) {
            rating = (int) (getProgress() / space) + 1;
            setProgress((int) (rating * space));
        }

        @Override
        public void onStartTrackingTouch(SeekBar seekBar) {
        }

        @Override
        public void onProgressChanged(SeekBar seekBar, int progress,
                boolean fromUser) {
        }
    };

    @Override
    protected synchronized void onDraw(Canvas canvas) {

        setMax(getWidth());
        canvas.clipPath(calculateStarPath());

        // TODO C'mon you can do better than that
        if (firstTime) {
            setProgress((int) space);
            firstTime = false;
        }

        super.onDraw(canvas);

    }

    private Path calculateStarPath() {
        Path path = new Path();

        space = getWidth() / starNumber;
        float centerY = (getHeight() / 2f) - (space / 2f);
        float step = space / 10;
        float startX;
        for (int i = 0; i < starNumber; i++) {
            startX = i * space;

            path.moveTo(startX + (step * 5), centerY + 0);

            path.lineTo(startX + (step * 3.3f), centerY + (step * 3.3f));

            path.lineTo(startX, centerY + (step * 4));

            path.lineTo(startX + (step * 2.3f), centerY + (step * 6.3f));

            path.lineTo(startX + +(step * 2), centerY + space);

            path.lineTo(startX + (step * 5), centerY + (step * 8.1f));

            path.lineTo(startX + +(step * 8), centerY + space);

            path.lineTo(startX + (step * 7.6f), centerY + (step * 6.3f));

            path.lineTo(startX + (step * 10), centerY + (step * 4));

            path.lineTo(startX + (step * 6.7f), centerY + (step * 3.3f));

            path.close();
        }
        return path;
    }

}