前言
作为一个资深篮球爱好者,我经常会用虎扑app看比赛直播,后来注意到文字直播界面右下角加了两个按钮,可以在直播过程中送虎扑币,为自己支持的球队加油。
具体的效果如下图所示:
我个人觉得挺好玩的,所以决定自己实现下这个按钮,废话不多说,先看实现的效果吧:
这个效果看起来和popupwindow差不多,但我是采用自定义view的方式来实现,下面说说过程。
实现过程
首先从虎扑的效果可以看到,它这两个按钮时浮在整个界面之上的,所以它需要和framelayout结合使用,因此我让它的宽度跟随屏幕大小,高度根据dpi固定,它的实际尺寸时这样的:
另外这个view初始化出来我们看到可以分为三块,背景圆、圆内文字、圆上方数字,所以正常状态下,只需要在ondraw方法中画出这三块内容即可。先在初始化方法中将自定义的属性和画笔以及初始化数据准备好:
private void init(context context, attributeset attrs) { //获取自定义属性 typedarray typedarray = context.obtainstyledattributes(attrs, r.styleable.hoopview); mthemecolor = typedarray.getcolor(r.styleable.hoopview_theme_color, color.yellow); mtext = typedarray.getstring(r.styleable.hoopview_text); mcount = typedarray.getstring(r.styleable.hoopview_count); mbgpaint = new paint(); mbgpaint.setantialias(true); mbgpaint.setcolor(mthemecolor); mbgpaint.setalpha(190); mbgpaint.setstyle(paint.style.fill); mpoppaint = new paint(); mpoppaint.setantialias(true); mpoppaint.setcolor(color.ltgray); mpoppaint.setalpha(190); mpoppaint.setstyle(paint.style.fill_and_stroke); mtextpaint = new textpaint(); mtextpaint.setantialias(true); mtextpaint.setcolor(mtextcolor); mtextpaint.settextsize(context.getresources().getdimension(r.dimen.hoop_text_size)); mcounttextpaint = new textpaint(); mcounttextpaint.setantialias(true); mcounttextpaint.setcolor(mthemecolor); mcounttextpaint.settextsize(context.getresources().getdimension(r.dimen.hoop_count_text_size)); typedarray.recycle(); mbigradius = context.getresources().getdimension(r.dimen.hoop_big_circle_radius); msmallradius = context.getresources().getdimension(r.dimen.hoop_small_circle_radius); margin = (int) context.getresources().getdimension(r.dimen.hoop_margin); mheight = (int) context.getresources().getdimension(r.dimen.hoop_view_height); countmargin = (int) context.getresources().getdimension(r.dimen.hoop_count_margin); mdatas = new string[] {"1", "10", "100"}; // 计算背景框改变的长度,默认是三个按钮 mchangewidth = (int) (2 * msmallradius * 3 + 4 * margin);}
在onmeasure中测出view的宽度后,根据宽度计算出背景圆的圆心坐标和一些相关的数据值。
@override protected void onmeasure(int widthmeasurespec, int heightmeasurespec) { int widthsize = measurespec.getsize(widthmeasurespec); mwidth = getdefaultsize(widthsize, widthmeasurespec); setmeasureddimension(mwidth, mheight); // 此时才测出了mwidth值,再计算圆心坐标及相关值 cx = mwidth - mbigradius; cy = mheight - mbigradius; // 大圆圆心 circle = new pointf(cx, cy); // 三个按钮的圆心 circleone = new pointf(cx - mbigradius - msmallradius - margin, cy); circletwo = new pointf(cx - mbigradius - 3 * msmallradius - 2 * margin, cy); circlethree = new pointf(cx - mbigradius - 5 * msmallradius - 3 * margin, cy); // 初始的背景框的边界即为大圆的四个边界点 top = cy - mbigradius; bottom = cy + mbigradius; }
因为这里面涉及到点击按钮展开和收缩的过程,所以我定义了如下几种状态,只有在特定的状态下才能进行某些操作。
private int mstate = state_normal;//当前展开收缩的状态 private boolean misrun = false;//是否正在展开或收缩 //正常状态 public static final int state_normal = 0; //按钮展开 public static final int state_expand = 1; //按钮收缩 public static final int state_shrink = 2; //正在展开 public static final int state_expanding = 3; //正在收缩 public static final int state_shrinking = 4;
接下来就执行ondraw方法了,先看看代码:
@override protected void ondraw(canvas canvas) { switch (mstate) { case state_normal: drawcircle(canvas); break; case state_shrink: case state_shrinking: drawbackground(canvas); break; case state_expand: case state_expanding: drawbackground(canvas); break; } drawcircletext(canvas); drawcounttext(canvas); }
圆上方的数字和圆内的文字是整个过程中一直存在的,所以我将这两个操作放在switch之外,正常状态下绘制圆和之前两部分文字,点击展开时绘制背景框展开过程和文字,展开状态下再次点击绘制收缩过程和文字,当然在绘制背景框的方法中也需要不断绘制大圆,大圆也是一直存在的。
上面的绘制方法:
/** * 画背景大圆 * @param canvas */ private void drawcircle(canvas canvas) { left = cx - mbigradius; right = cx + mbigradius; canvas.drawcircle(cx, cy, mbigradius, mbgpaint); } /** * 画大圆上面表示金币数的文字 * @param canvas */ private void drawcounttext(canvas canvas) { canvas.translate(0, -countmargin); //计算文字的宽度 float textwidth = mcounttextpaint.measuretext(mcount, 0, mcount.length()); canvas.drawtext(mcount, 0, mcount.length(), (2 * mbigradius - textwidth - 35) / 2, 0.2f, mcounttextpaint); } /** * 画大圆内的文字 * @param canvas */ private void drawcircletext(canvas canvas) { staticlayout layout = new staticlayout(mtext, mtextpaint, (int) (mbigradius * math.sqrt(2)), layout.alignment.align_center, 1.0f, 0.0f, true); canvas.translate(mwidth - mbigradius * 1.707f, mheight - mbigradius * 1.707f); layout.draw(canvas); canvas.save(); } /** * 画背景框展开和收缩 * @param canvas */ private void drawbackground(canvas canvas) { left = cx - mbigradius - mchange; right = cx + mbigradius; canvas.drawroundrect(left, top, right, bottom, mbigradius, mbigradius, mpoppaint); if ((mchange > 0) && (mchange <= 2 * msmallradius + margin)) { // 绘制第一个按钮 canvas.drawcircle(cx - mchange, cy, msmallradius, mbgpaint); // 绘制第一个按钮内的文字 canvas.drawtext(mdatas[0], cx - (mbigradius - msmallradius) - mchange, cy + 15, mtextpaint); } else if ((mchange > 2 * msmallradius + margin) && (mchange <= 4 * msmallradius + 2 * margin)) { // 绘制第一个按钮 canvas.drawcircle(cx - mbigradius - msmallradius - margin, cy, msmallradius, mbgpaint); // 绘制第一个按钮内的文字 canvas.drawtext(mdatas[0], cx - mbigradius - msmallradius - margin - 20, cy + 15, mtextpaint); // 绘制第二个按钮 canvas.drawcircle(cx - mchange, cy, msmallradius, mbgpaint); // 绘制第二个按钮内的文字 canvas.drawtext(mdatas[1], cx - mchange - 20, cy + 15, mtextpaint); } else if ((mchange > 4 * msmallradius + 2 * margin) && (mchange <= 6 * msmallradius + 3 * margin)) { // 绘制第一个按钮 canvas.drawcircle(cx - mbigradius - msmallradius - margin, cy, msmallradius, mbgpaint); // 绘制第一个按钮内的文字 canvas.drawtext(mdatas[0], cx - mbigradius - msmallradius - margin - 16, cy + 15, mtextpaint); // 绘制第二个按钮 canvas.drawcircle(cx - mbigradius - 3 * msmallradius - 2 * margin, cy, msmallradius, mbgpaint); // 绘制第二个按钮内的文字 canvas.drawtext(mdatas[1], cx - mbigradius - 3 * msmallradius - 2 * margin - 25, cy + 15, mtextpaint); // 绘制第三个按钮 canvas.drawcircle(cx - mchange, cy, msmallradius, mbgpaint); // 绘制第三个按钮内的文字 canvas.drawtext(mdatas[2], cx - mchange - 34, cy + 15, mtextpaint); } else if (mchange > 6 * msmallradius + 3 * margin) { // 绘制第一个按钮 canvas.drawcircle(cx - mbigradius - msmallradius - margin, cy, msmallradius, mbgpaint); // 绘制第一个按钮内的文字 canvas.drawtext(mdatas[0], cx - mbigradius - msmallradius - margin - 16, cy + 15, mtextpaint); // 绘制第二个按钮 canvas.drawcircle(cx - mbigradius - 3 * msmallradius - 2 * margin, cy, msmallradius, mbgpaint); // 绘制第二个按钮内的文字 canvas.drawtext(mdatas[1], cx - mbigradius - 3 * msmallradius - 2 * margin - 25, cy + 15, mtextpaint); // 绘制第三个按钮 canvas.drawcircle(cx - mbigradius - 5 * msmallradius - 3 * margin, cy, msmallradius, mbgpaint); // 绘制第三个按钮内的文字 canvas.drawtext(mdatas[2], cx - mbigradius - 5 * msmallradius - 3 * margin - 34, cy + 15, mtextpaint); } drawcircle(canvas); }
然后是点击事件的处理,只有触摸点在大圆内时才会触发展开或收缩的操作,点击小圆时提供了一个接口给外部调用。
@override public boolean ontouchevent(motionevent event) { int action = event.getaction(); switch (action) { case motionevent.action_down: //如果点击的时候动画在进行,不处理 if (misrun) return true; pointf pointf = new pointf(event.getx(), event.gety()); if (ispointincircle(pointf, circle, mbigradius)) { //如果触摸点在大圆内,根据弹出方向弹出或者收缩按钮 if ((mstate == state_shrink || mstate == state_normal) && !misrun) { //展开 misrun = true;//这是必须先设置true,因为onanimationstart在onanimationupdate之后才调用 showpopmenu(); } else { //收缩 misrun = true; hidepopmenu(); } } else { //触摸点不在大圆内 if (mstate == state_expand) { //如果是展开状态 if (ispointincircle(pointf, circleone, msmallradius)) { listener.clickbutton(this, integer.parseint(mdatas[0])); } else if (ispointincircle(pointf, circletwo, msmallradius)) { listener.clickbutton(this, integer.parseint(mdatas[1])); } else if (ispointincircle(pointf, circlethree, msmallradius)) { listener.clickbutton(this, integer.parseint(mdatas[2])); } misrun = true; hidepopmenu(); } } break; } return super.ontouchevent(event); }
展开和收缩的动画是改变背景框的宽度属性的动画,并监听这个属性动画,在宽度值改变的过程中去重新绘制整个view。因为一开始我就确定了大圆小圆的半径和小圆与背景框之间的间距,所以初始化时已经计算好了背景框的宽度:
mchangewidth = (int) (2 * msmallradius * 3 + 4 * margin);
/** * 弹出背景框 */ private void showpopmenu() { if (mstate == state_shrink || mstate == state_normal) { valueanimator animator = valueanimator.ofint(0, mchangewidth); animator.addupdatelistener(new valueanimator.animatorupdatelistener() { @override public void onanimationupdate(valueanimator animation) { if (misrun) { mchange = (int) animation.getanimatedvalue(); invalidate(); } else { animation.cancel(); mstate = state_normal; } } }); animator.addlistener(new animatorlisteneradapter() { @override public void onanimationstart(animator animation) { super.onanimationstart(animation); misrun = true; mstate = state_expanding; } @override public void onanimationcancel(animator animation) { super.onanimationcancel(animation); misrun = false; mstate = state_normal; } @override public void onanimationend(animator animation) { super.onanimationend(animation); misrun = false; //动画结束后设置状态为展开 mstate = state_expand; } }); animator.setduration(500); animator.start(); } }
/** * 隐藏弹出框 */ private void hidepopmenu() { if (mstate == state_expand) { valueanimator animator = valueanimator.ofint(mchangewidth, 0); animator.addupdatelistener(new valueanimator.animatorupdatelistener() { @override public void onanimationupdate(valueanimator animation) { if (misrun) { mchange = (int) animation.getanimatedvalue(); invalidate(); } else { animation.cancel(); } } }); animator.addlistener(new animatorlisteneradapter() { @override public void onanimationstart(animator animation) { super.onanimationstart(animation); misrun = true; mstate = state_shrinking; } @override public void onanimationcancel(animator animation) { super.onanimationcancel(animation); misrun = false; mstate = state_expand; } @override public void onanimationend(animator animation) { super.onanimationend(animation); misrun = false; //动画结束后设置状态为收缩 mstate = state_shrink; } }); animator.setduration(500); animator.start(); } }
这个过程看起来是弹出或收缩,实际上宽度值每改变一点,就将所有的组件重绘一次,只是文字和大圆等内容的尺寸及位置都没有变化,只有背景框的宽度值在变,所以才有这种效果。
在xml中的使用:
<linearlayout android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_alignparentbottom="true" android:layout_marginbottom="20dp" android:layout_alignparentright="true" android:orientation="vertical"> <com.xx.hoopcustomview.hoopview android:id="@+id/hoopview1" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginright="10dp" app:text="支持火箭" app:count="1358" app:theme_color="#31a129"/> <com.xx.hoopcustomview.hoopview android:id="@+id/hoopview2" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginright="10dp" app:text="热火无敌" app:count="251" app:theme_color="#f49c11"/> </linearlayout>
activity中使用:
hoopview1 = (hoopview) findviewbyid(r.id.hoopview1); hoopview1.setonclickbuttonlistener(new hoopview.onclickbuttonlistener() { @override public void clickbutton(view view, int num) { toast.maketext(mainactivity.this, "hoopview1增加了" + num, toast.length_short).show(); } });
大致实现过程就是这样,与原始效果还是有点区别,我这个还有很多瑕疵,比如文字的位置居中问题,弹出或收缩时,小圆内的文字的旋转动画我没有实现。
总结
以上就是这篇文章的全部内容了,希望本文的内容对各位android开发者们能带来一定的帮助,如果有疑问大家可以留言交流,谢谢大家对移动技术网的支持。
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