本文实例为大家分享了Android实现五星好评效果的具体代码，供大家参考，具体内容如下
这个效果想必大家都非常熟悉，那么Android如何自定义实现这种效果呢？
首先自定义属性：
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<?xml version="1.0" encoding="utf-8"?><resources> <declare-styleable name="RatingStar"> <attr name="starNormal" format="reference"/> <attr name="starFocus" format="reference"/> <attr name="starNumber" format="integer"/> </declare-styleable></resources> |
下面看看具体实现：
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/** * Created by Michael on 2019/11/1. */ public class RatingStar extends View { private int normalId; private int focusId; private Bitmap normalImg; private Bitmap focusImg; private int number; private int w1; private int h1; private int marginLeft; private int marginTop; private int marginBottom; private int marginRight; private int height; private int width; private int p; private float w0; private int i0; private int mGrade; public RatingStar(Context context) { this(context,null); } public RatingStar(Context context, @Nullable AttributeSet attrs) { this(context, attrs,0); } public RatingStar(Context context, @Nullable AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); TypedArray array = context.obtainStyledAttributes(attrs,R.styleable.RatingStar); normalId = array.getResourceId(R.styleable.RatingStar_starNormal,0); focusId = array.getResourceId(R.styleable.RatingStar_starFocus,0); normalImg = BitmapFactory.decodeResource(getResources(), normalId); focusImg = BitmapFactory.decodeResource(getResources(), focusId); number = array.getInteger(R.styleable.RatingStar_starNumber,5); array.recycle(); i0 = -1; } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { w1 = normalImg.getWidth(); h1 = normalImg.getHeight(); //中间间隔 p = 30; marginTop = 20; marginBottom = 20; marginLeft = 20; marginRight = 20; height = h1 + marginTop + marginBottom; width = w1 *number+(number-1)*p +marginLeft+marginRight; setMeasuredDimension(width, height); } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); for (int i = 0; i < number; i++) { if (i <= i0){ canvas.drawBitmap(focusImg,i*w1+marginLeft+i*p,marginTop,null); mGrade = i+1; }else{ canvas.drawBitmap(normalImg,i*w1+marginLeft+i*p,marginTop,null); } } Log.e("msg","我被调用了！"); } @Override public boolean onTouchEvent(MotionEvent event) { float x = event.getX();//相对于控件自身的距离 //event.getRawX() 相对于屏幕的距离 switch (event.getAction()){ case MotionEvent.ACTION_DOWN: case MotionEvent.ACTION_MOVE: //case MotionEvent.ACTION_UP: w0 = getWidth()/5; i0 = (int) (x/w0); //性能优化，减少onDraw()调用 if (mGrade == i0+1){ return true; } invalidate(); break; } return true; }} |
最后看看具体布局中使用：
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<com.example.star.RatingStar android:layout_width="wrap_content" android:layout_height="wrap_content" app:starNormal="@mipmap/star_normal" app:starFocus="@mipmap/star_selected" app:starNumber="5" /> |
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服务器之家。
原文链接：https://blog.csdn.net/qq_36428821/article/details/102861995
