本文实例为大家分享了Android仿大众点评星星评分控件的具体代码,供大家参考,具体内容如下
话不多说,直接上代码,这里采用的是自定View
public class RatingBar extends View { // 正常、半个和选中的星星 private Bitmap mStarNormal, mStarHalf, mStarSelected; //星星的总数 private int mStartTotalNumber = 5; //选中的星星个数 private float mSelectedNumber; // 星星之间的间距 private int mStartDistance; // 是否画满 private Status mStatus = Status.FULL; // 星星的宽高 private float mStarWidth; private float mStarHeight; // 星星选择变化的回调 private OnStarChangeListener mOnStarChangeListener; // 是不是要画满,默认不画半个的 private boolean isFull; // 画笔 private Paint mPaint = new Paint(); // 用于判断是绘制半个,还是全部 private enum Status { FULL, HALF } public void setOnStarChangeListener(OnStarChangeListener OnStarChangeListener) { this.mOnStarChangeListener = OnStarChangeListener; } public RatingBar(Context context) { this(context, null); } public RatingBar(Context context, @Nullable AttributeSet attrs) { this(context, attrs, 0); } public RatingBar(Context context, @Nullable AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); TypedArray array = context.obtainStyledAttributes(attrs, R.styleable.RatingBar); // 未选中的图片资源 int starNormalId = array.getResourceId(R.styleable.RatingBar_starEmptyRes, 0); if (starNormalId == 0) { throw new IllegalArgumentException("请设置属性 starNormal"); } mStarNormal = BitmapFactory.decodeResource(getResources(), starNormalId); // 选中一半的图片资源 int starHalfId = array.getResourceId(R.styleable.RatingBar_starHalfRes, 0); if (starHalfId != 0) { mStarHalf = BitmapFactory.decodeResource(getResources(), starHalfId); } // 选中全部的图片资源 int starSelectedId = array.getResourceId(R.styleable.RatingBar_starSelectedRes, 0); if (starSelectedId == 0) { throw new IllegalArgumentException("请设置属性 starSelected"); } mStarSelected = BitmapFactory.decodeResource(getResources(), starSelectedId); // 如果没设置一半的图片资源,就用全部的代替 if (starHalfId == 0) { mStarHalf = mStarSelected; } mStartTotalNumber = array.getInt(R.styleable.RatingBar_startTotalNumber, mStartTotalNumber); mSelectedNumber = array.getFloat(R.styleable.RatingBar_selectedNumber, mSelectedNumber); mStartDistance = (int) array.getDimension(R.styleable.RatingBar_starDistance, 0); mStarWidth = array.getDimension(R.styleable.RatingBar_starWidth, 0); mStarHeight = array.getDimension(R.styleable.RatingBar_starHeight, 0); isFull = array.getBoolean(R.styleable.RatingBar_starIsFull, true); array.recycle(); // 如有指定宽高,获取最大值 去改变星星的大小(星星是正方形) int starWidth = (int) Math.max(mStarWidth, mStarHeight); if (starWidth > 0) { mStarNormal = resetBitmap(mStarNormal, starWidth); mStarSelected = resetBitmap(mStarSelected, starWidth); mStarHalf = resetBitmap(mStarHalf, starWidth); } // 计算一半还是全部(小数部分小于等于0.5就只是显示一半) if (!isFull) { int num = (int) mSelectedNumber; if (mSelectedNumber <= (num + 0.5f)) { mStatus = Status.HALF; } } } /** * 设置全部选中的图片 * * @param bitmap */ public void allImage(Bitmap bitmap) { mStarSelected = bitmap; int starWidth = (int) Math.max(mStarWidth, mStarHeight); if (starWidth > 0) { mStarNormal = resetBitmap(mStarNormal, starWidth); mStarSelected = resetBitmap(mStarSelected, starWidth); mStarHalf = resetBitmap(mStarHalf, starWidth); } invalidate(); } /** * 设置选中一半的图片 * * @param bitmap */ public void mStarHalf(Bitmap bitmap) { mStarHalf = bitmap; int starWidth = (int) Math.max(mStarWidth, mStarHeight); if (starWidth > 0) { mStarNormal = resetBitmap(mStarNormal, starWidth); mStarSelected = resetBitmap(mStarSelected, starWidth); mStarHalf = resetBitmap(mStarHalf, starWidth); } invalidate(); } /** * 如果用户设置了图片的宽高,就重新设置图片 */ public Bitmap resetBitmap(Bitmap bitMap, int startWidth) { // 得到新的图片 return Bitmap.createScaledBitmap(bitMap, startWidth, startWidth, true); } /** * 设置选中星星的数量 */ public void setSelectedNumber(int selectedNumber) { if (selectedNumber >= 0 && selectedNumber <= mStartTotalNumber) { this.mSelectedNumber = selectedNumber; invalidate(); } } /** * 设置星星的总数量 */ public void setStartTotalNumber(int startTotalNumber) { if (startTotalNumber > 0) { this.mStartTotalNumber = startTotalNumber; invalidate(); } } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); // 用正常的一个星星图片去测量高 int height = getPaddingTop() + getPaddingBottom() + mStarNormal.getHeight(); // 宽 = 星星的宽度*总数 + 星星的间距*(总数-1) +padding int width = getPaddingLeft() + getPaddingRight() + mStarNormal.getWidth() * mStartTotalNumber + mStartDistance * (mStartTotalNumber - 1); setMeasuredDimension(width, height); } @Override protected void onDraw(Canvas canvas) { // 循环绘制 for (int i = 0; i < mStartTotalNumber; i++) { float left = getPaddingLeft(); // 从第二个星星开始,给它设置星星的间距 if (i > 0) { left = getPaddingLeft() + i * (mStarNormal.getWidth() + mStartDistance); } float top = getPaddingTop(); // 绘制选中的星星 if (i < mSelectedNumber) { // 比当前选中的数量小 if (i < mSelectedNumber - 1) { canvas.drawBitmap(mStarSelected, left, top, mPaint); } else { // 在这里判断是不是要绘制满的 if (mStatus == Status.FULL) { canvas.drawBitmap(mStarSelected, left, top, mPaint); } else { canvas.drawBitmap(mStarHalf, left, top, mPaint); } } } else { // 绘制正常的星星 canvas.drawBitmap(mStarNormal, left, top, mPaint); } } } @Override public boolean onTouchEvent(MotionEvent event) { switch (event.getAction()) { //减少绘制 case MotionEvent.ACTION_MOVE: // 获取用户触摸的x位置 float x = event.getX(); // 一个星星占的宽度 int startWidth = getWidth() / mStartTotalNumber; // 计算用户触摸星星的位置 int position = (int) (x / startWidth + 1); if (position < 0) { position = 0; } if (position > mStartTotalNumber) { position = mStartTotalNumber; } // 计算绘制的星星是不是满的 float result = x - startWidth * (position - 1); Status status; // 结果大于一半就是满的 if (result > startWidth * 0.5f) { // 满的 status = Status.FULL; } else { // 一半的 status = Status.HALF; } if (isFull) { status = Status.FULL; } //减少绘制 if (mSelectedNumber != position || status != mStatus) { mSelectedNumber = position; mStatus = status; invalidate(); if (mOnStarChangeListener != null) { position = (int) (mSelectedNumber - 1); // 选中的数量:满的就回调(1.0这种),一半就(0.5这种) float selectedNumber = status == Status.FULL ? mSelectedNumber : (mSelectedNumber - 0.5f); mOnStarChangeListener.OnStarChanged(selectedNumber, position < 0 ? 0 : position); } } break; } return true; } // 回调监听(选中的数量,位置) public interface OnStarChangeListener { void OnStarChanged(float selectedNumber, int position); } }
自定义属性
<declare-styleable name="RatingBar"> <!--未选中--> <attr name="starEmptyRes" format="reference" /> <!--选中半个--> <attr name="starHalfRes" format="reference" /> <!--选中全部--> <attr name="starSelectedRes" format="reference" /> <!--星星的总数--> <attr name="startTotalNumber" format="integer" /> <!--默认选中的数量 --> <attr name="selectedNumber" format="float" /> <!--星星的间距--> <attr name="starDistance" format="dimension" /> <!--星星的宽度--> <attr name="starWidth" format="dimension" /> <!--星星的高度--> <attr name="starHeight" format="dimension" /> <!--是不是只画整个星星,不画半个--> <attr name="starIsFull" format="boolean" /> </declare-styleable>
xml 配置
<com.demo.mvp_demo.ui.shop.RatingBar android:id="@+id/rb" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_gravity="center" app:starHeight="30dp" app:starWidth="30dp" app:selectedNumber="0.0" app:starDistance="15dp" app:starEmptyRes="@drawable/no" app:starHalfRes="@drawable/twoban" app:starIsFull="false" app:starSelectedRes="@drawable/two" />
在activity里 rb指的是 RatingBar rb;
大概就是这个样子 具体的需求 需要根据UI提供图来.
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持呐喊教程。
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