一个简单的星级评分，您可以更轻松地自定义图像和动画

package com.willy.ratingbar; import ohos.agp.components.AttrSet; import ohos.agp.components.Component; import ohos.agp.components.DirectionalLayout; import ohos.agp.components.PageSlider; import ohos.app.Context; import ohos.global.resource.RawFileEntry; import ohos.global.resource.ResourceManager; import ohos.media.image.ImageSource; import ohos.media.image.PixelMap; import ohos.multimodalinput.event.TouchEvent; import java.io.IOException; import java.io.InputStream; import java.math.BigDecimal; import java.util.ArrayList; import java.util.List; /** * Created by willy on 2017/5/5. */ public class BaseRatingBar extends DirectionalLayout implements SimpleRatingBar, Component.TouchEventListener { private static final String FORMAT = "image/jpg"; private int mNumStars; private int mPadding = 20; private int mStarWidth; private int mStarHeight; private float mMinimumStars = 0; private float mRating = -1; private float mStepSize = 1f; private float mPreviousRating = 0; private float mNmu = 10; private boolean mIsIndicator = false; private boolean mIsScrollable = true; private boolean mIsClickable = true; private boolean mClearRatingEnabled = true; private float mStartX; private float mStartY; private PixelMap mEmptyDrawable; private PixelMap mFilledDrawable; private OnRatingChangeListener mOnRatingChangeListener; protected List<PartialView> mPartialViews; public BaseRatingBar(Context context, AttrSet attrs) { this(context, attrs, "0"); } /** * @param context context * @param attrs attributes from XML => app:mainText="mainText" * @param defStyleAttr attributes from default style (Application theme or theme) */ public BaseRatingBar(Context context, AttrSet attrs, String defStyleAttr) { super(context, attrs, defStyleAttr); setOrientation(HORIZONTAL); initParamsValue(attrs, context); verifyParamsValue(); initRatingView(); float rating = 0; if (isPresent(attrs, "srb_rating")) { rating = attrs.getAttr("srb_rating").get().getFloatValue(); } setRating(rating); setTouchEventListener(this); } private void initParamsValue(AttrSet attrs, Context context) { mEmptyDrawable = getPixelMap("resources/rawfile/empty.png"); mFilledDrawable = getPixelMap("resources/rawfile/filled.png"); if (isPresent(attrs, "srb_numStars")) { mNumStars = attrs.getAttr("srb_numStars").get().getIntegerValue(); } if (isPresent(attrs, "srb_starPadding")) { mPadding = attrs.getAttr("srb_starPadding").get().getDimensionValue(); } if (isPresent(attrs, "srb_starWidth")) { mStarWidth = attrs.getAttr("srb_starWidth").get().getDimensionValue(); } if (isPresent(attrs, "srb_starHeight")) { mStarHeight = attrs.getAttr("srb_starHeight").get().getDimensionValue(); } if (isPresent(attrs, "srb_stepSize")) { mStepSize = attrs.getAttr("srb_stepSize").get().getFloatValue(); } if (isPresent(attrs, "srb_minimumStars")) { mMinimumStars = attrs.getAttr("srb_minimumStars").get().getFloatValue(); } if (isPresent(attrs, "srb_isIndicator")) { mIsIndicator = attrs.getAttr("srb_isIndicator").get().getBoolValue(); } if (isPresent(attrs, "srb_scrollable")) { mIsScrollable = attrs.getAttr("srb_scrollable").get().getBoolValue(); } if (isPresent(attrs, "srb_clickable")) { mIsClickable = attrs.getAttr("srb_clickable").get().getBoolValue(); } if (isPresent(attrs, "srb_clearRatingEnabled")) { mClearRatingEnabled = attrs.getAttr("srb_clearRatingEnabled").get().getBoolValue(); } } private boolean isPresent(AttrSet attrs, String name) { return attrs.getAttr(name).isPresent(); } private void verifyParamsValue() { if (mNumStars <= 0) { mNumStars = 5; } if (mPadding < 0) { mPadding = 0; } if (mEmptyDrawable == null) { mEmptyDrawable = getPixelMap("resources/rawfile/empty.png"); } if (mFilledDrawable == null) { mFilledDrawable = getPixelMap("resources/rawfile/filled.png"); } if (mStepSize > 1.0f) { mStepSize = 1.0f; } else if (mStepSize < 0.1f) { mStepSize = 0.1f; } mMinimumStars = RatingBarUtils.getValidMinimumStars(mMinimumStars, mNumStars, mStepSize); } private PixelMap getPixelMap(String rawfile) { ResourceManager resManager = getResourceManager(); RawFileEntry rawFileEntry = resManager.getRawFileEntry(rawfile); try { InputStream resource = rawFileEntry.openRawFile(); ImageSource imageSource = ImageSource.create(resource, null); return imageSource.createPixelmap(null); } catch (IOException e) { System.out.println(e); } return null; } private void initRatingView() { mPartialViews = new ArrayList<>(); for (int pos = 1; pos <= mNumStars; pos++) { PartialView partialView = getPartialView(pos, mStarWidth, mStarHeight, mPadding, mFilledDrawable, mEmptyDrawable); addComponent(partialView); mPartialViews.add(partialView); } } private PartialView getPartialView(final int partialViewId, int starWidth, int starHeight, int padding, PixelMap filledDrawable, PixelMap emptyDrawable) { PartialView partialView = new PartialView(getContext(), partialViewId, starWidth, starHeight, padding); partialView.setFilledDrawable(filledDrawable); partialView.setEmptyDrawable(emptyDrawable); return partialView; } /** * Retain this method to let other RatingBar can custom their decrease animation. */ protected void emptyRatingBar() { fillRatingBar(0); } /** * the view which id is 3 also need to be filled * * @param rating rating */ protected void fillRatingBar(final float rating) { double maxIntOfRating = Math.ceil(rating); for (PartialView partialView : mPartialViews) { int ratingViewId = (int) partialView.getTag(); if (ratingViewId > maxIntOfRating) { partialView.setEmpty(); continue; } else { partialView.setFilled(); } } } @Override public void setNumStars(int numStars) { if (numStars <= 0) { return; } mPartialViews.clear(); removeAllComponents(); mNumStars = numStars; initRatingView(); } @Override public int getNumStars() { return mNumStars; } @Override public void setRating(float rating) { setRating(rating, false); } private void setRating(float rating, boolean fromUser) { if (rating > mNumStars) { rating = mNumStars; } if (rating < mMinimumStars) { rating = mMinimumStars; } BigDecimal bignum1 = new BigDecimal(mRating); BigDecimal bignum2 = new BigDecimal(rating); float value = bignum1.subtract(bignum2).floatValue(); if (Math.abs(value) <= 0) { return; } // Respect Step size. So if the defined step size is 0.5, and we're attributing it a 4.7 rating, // it should actually be set to `4.5` rating. mRating = Double.valueOf(Math.floor(rating / mStepSize)).floatValue() * mStepSize; if (mOnRatingChangeListener != null) { mOnRatingChangeListener.onRatingChange(this, mRating, fromUser); } fillRatingBar(mRating); }