android开发分享Android自定义View实现五星好评效果实例为大家分享了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：
<?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：
/** * 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：
<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android开发分享Android自定义View实现五星好评效果的全部内容，希望对大家的学习有所帮助，也希望大家多多支持<计算机技术网(www.ctvol.com)!!>。
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