Android自定義View仿大眾點評星星評分控件
本文實例為大傢分享瞭Android仿大眾點評星星評分控件的具體代碼,供大傢參考,具體內容如下
話不多說,直接上代碼,這裡采用的是自定View
public class RatingBar extends View { // 正常、半個和選中的星星 private Bitmap mStarNormal, mStarHalf, mStarSelected; //星星的總數 private int mStartTotalNumber = 5; //選中的星星個數 private float mSelectedNumber; // 星星之間的間距 private int mStartDistance; // 是否畫滿 private Status mStatus = Status.FULL; // 星星的寬高 private float mStarWidth; private float mStarHeight; // 星星選擇變化的回調 private OnStarChangeListener mOnStarChangeListener; // 是不是要畫滿,默認不畫半個的 private boolean isFull; // 畫筆 private Paint mPaint = new Paint(); // 用於判斷是繪制半個,還是全部 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); // 未選中的圖片資源 int starNormalId = array.getResourceId(R.styleable.RatingBar_starEmptyRes, 0); if (starNormalId == 0) { throw new IllegalArgumentException("請設置屬性 starNormal"); } mStarNormal = BitmapFactory.decodeResource(getResources(), starNormalId); // 選中一半的圖片資源 int starHalfId = array.getResourceId(R.styleable.RatingBar_starHalfRes, 0); if (starHalfId != 0) { mStarHalf = BitmapFactory.decodeResource(getResources(), starHalfId); } // 選中全部的圖片資源 int starSelectedId = array.getResourceId(R.styleable.RatingBar_starSelectedRes, 0); if (starSelectedId == 0) { throw new IllegalArgumentException("請設置屬性 starSelected"); } mStarSelected = BitmapFactory.decodeResource(getResources(), starSelectedId); // 如果沒設置一半的圖片資源,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(); // 如有指定寬高,獲取最大值 去改變星星的大小(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); } // 計算一半還是全部(小數部分小於等於0.5就隻是顯示一半) if (!isFull) { int num = (int) mSelectedNumber; if (mSelectedNumber <= (num + 0.5f)) { mStatus = Status.HALF; } } } /** * 設置全部選中的圖片 * * @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(); } /** * 設置選中一半的圖片 * * @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(); } /** * 如果用戶設置瞭圖片的寬高,就重新設置圖片 */ public Bitmap resetBitmap(Bitmap bitMap, int startWidth) { // 得到新的圖片 return Bitmap.createScaledBitmap(bitMap, startWidth, startWidth, true); } /** * 設置選中星星的數量 */ public void setSelectedNumber(int selectedNumber) { if (selectedNumber >= 0 && selectedNumber <= mStartTotalNumber) { this.mSelectedNumber = selectedNumber; invalidate(); } } /** * 設置星星的總數量 */ public void setStartTotalNumber(int startTotalNumber) { if (startTotalNumber > 0) { this.mStartTotalNumber = startTotalNumber; invalidate(); } } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); // 用正常的一個星星圖片去測量高 int height = getPaddingTop() + getPaddingBottom() + mStarNormal.getHeight(); // 寬 = 星星的寬度*總數 + 星星的間距*(總數-1) +padding int width = getPaddingLeft() + getPaddingRight() + mStarNormal.getWidth() * mStartTotalNumber + mStartDistance * (mStartTotalNumber - 1); setMeasuredDimension(width, height); } @Override protected void onDraw(Canvas canvas) { // 循環繪制 for (int i = 0; i < mStartTotalNumber; i++) { float left = getPaddingLeft(); // 從第二個星星開始,給它設置星星的間距 if (i > 0) { left = getPaddingLeft() + i * (mStarNormal.getWidth() + mStartDistance); } float top = getPaddingTop(); // 繪制選中的星星 if (i < mSelectedNumber) { // 比當前選中的數量小 if (i < mSelectedNumber - 1) { canvas.drawBitmap(mStarSelected, left, top, mPaint); } else { // 在這裡判斷是不是要繪制滿的 if (mStatus == Status.FULL) { canvas.drawBitmap(mStarSelected, left, top, mPaint); } else { canvas.drawBitmap(mStarHalf, left, top, mPaint); } } } else { // 繪制正常的星星 canvas.drawBitmap(mStarNormal, left, top, mPaint); } } } @Override public boolean onTouchEvent(MotionEvent event) { switch (event.getAction()) { //減少繪制 case MotionEvent.ACTION_MOVE: // 獲取用戶觸摸的x位置 float x = event.getX(); // 一個星星占的寬度 int startWidth = getWidth() / mStartTotalNumber; // 計算用戶觸摸星星的位置 int position = (int) (x / startWidth + 1); if (position < 0) { position = 0; } if (position > mStartTotalNumber) { position = mStartTotalNumber; } // 計算繪制的星星是不是滿的 float result = x - startWidth * (position - 1); Status status; // 結果大於一半就是滿的 if (result > startWidth * 0.5f) { // 滿的 status = Status.FULL; } else { // 一半的 status = Status.HALF; } if (isFull) { status = Status.FULL; } //減少繪制 if (mSelectedNumber != position || status != mStatus) { mSelectedNumber = position; mStatus = status; invalidate(); if (mOnStarChangeListener != null) { position = (int) (mSelectedNumber - 1); // 選中的數量:滿的就回調(1.0這種),一半就(0.5這種) float selectedNumber = status == Status.FULL ? mSelectedNumber : (mSelectedNumber - 0.5f); mOnStarChangeListener.OnStarChanged(selectedNumber, position < 0 ? 0 : position); } } break; } return true; } // 回調監聽(選中的數量,位置) public interface OnStarChangeListener { void OnStarChanged(float selectedNumber, int position); } }
自定義屬性
<declare-styleable name="RatingBar"> <!--未選中--> <attr name="starEmptyRes" format="reference" /> <!--選中半個--> <attr name="starHalfRes" format="reference" /> <!--選中全部--> <attr name="starSelectedRes" format="reference" /> <!--星星的總數--> <attr name="startTotalNumber" format="integer" /> <!--默認選中的數量 --> <attr name="selectedNumber" format="float" /> <!--星星的間距--> <attr name="starDistance" format="dimension" /> <!--星星的寬度--> <attr name="starWidth" format="dimension" /> <!--星星的高度--> <attr name="starHeight" format="dimension" /> <!--是不是隻畫整個星星,不畫半個--> <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裡 rb指的是 RatingBar rb;
大概就是這個樣子 具體的需求 需要根據UI提供圖來.
以上就是本文的全部內容,希望對大傢的學習有所幫助,也希望大傢多多支持WalkonNet。
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