本篇文章為大家展示了如何在Android應(yīng)用中實(shí)現(xiàn)自定義View,內(nèi)容簡(jiǎn)明扼要并且容易理解,絕對(duì)能使你眼前一亮,通過(guò)這篇文章的詳細(xì)介紹希望你能有所收獲。
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自定義view大概可以分為四個(gè)大類,主要是通過(guò)實(shí)現(xiàn)方式來(lái)區(qū)分
1.自繪控件,繼承view,重寫onDraw方法,在其中進(jìn)行繪制,需要自己適配邊距等等
2.繼承ViewGroup派生的特殊Layout,主要用于實(shí)現(xiàn)自定義布局,也需要自己適配邊距等
3.繼承特定的View(如TextView等),不用自己適配支持wrap_conten,match_parent,可以給其加入新的功能
4.繼承特定的ViewGroup,例如linearlayout,多用于多個(gè)控件的組合view,也不用自己去做適配
自繪控件
這種自定義view是最復(fù)雜的一種,因?yàn)榧纫m配wrap_conten,match_parent又要通過(guò)條件判斷來(lái)在屏幕上繪制不同的內(nèi)容,主要就是重寫onDraw方法
以下是一個(gè)簡(jiǎn)單的onDraw重寫代碼
@Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); final int paddingLeft = getPaddingLeft(); final int paddingRight = getPaddingRight(); final int paddingTop = getPaddingTop(); final int paddingBottom = getPaddingBottom(); //get the view's width and height and decide the radiu int width = getWidth() - paddingLeft - paddingRight; int height = getHeight() - paddingTop - paddingBottom; radiu = Math.min(width , height) / 2 - boundWidth - progressWidth; //setup the paint paint.setStyle(Paint.Style.STROKE); paint.setStrokeWidth(boundWidth); paint.setColor(Color.BLACK); //draw the inner circle int centerX = paddingLeft + getWidth()/2; int centerY = paddingTop + getHeight() / 2; canvas.drawCircle(centerX,centerY, radiu, paint); float totalRadiu = radiu +boundWidth +progressWidth/2; //draw the circlr pic if (drawable != null&&bitmap == null) { image = ((BitmapDrawable) drawable).getBitmap(); bitmap = Bitmap.createBitmap((int)(2*totalRadiu),(int)(2*totalRadiu), Bitmap.Config.ARGB_8888); Canvas bitmapCanvas = new Canvas(bitmap); Paint bitmapPaint = new Paint(); bitmapPaint.setAntiAlias(true); bitmapCanvas.drawCircle(totalRadiu, totalRadiu, radiu, bitmapPaint); bitmapPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN)); bitmapCanvas.drawBitmap(image,null,new RectF(0,0,2*totalRadiu,2*totalRadiu) , bitmapPaint); } Rect rect = new Rect((int)(centerX -totalRadiu),(int)(centerY-totalRadiu),(int)(centerX+totalRadiu),(int)(centerY+ totalRadiu)); canvas.save(); if(isRotate) canvas.rotate(rotateDegree,centerX,centerY); canvas.drawBitmap(bitmap,null ,rect, paint); canvas.restore(); //set paint for arc paint.setStrokeWidth(progressWidth); paint.setStrokeCap(Paint.Cap.ROUND); //prepare for draw arc RectF oval = new RectF(); oval.left = centerX -totalRadiu ; oval.top =centerY- totalRadiu ; oval.right = centerX + totalRadiu; oval.bottom = centerY+ totalRadiu; paint.setColor(progressBackColor); //draw background arc canvas.drawArc(oval, arcStar, arcEnd, false, paint); //draw progress arc paint.setColor(progressColor); canvas.drawArc(oval, arcStar, progress, false, paint); }
標(biāo)題名稱:如何在Android應(yīng)用中實(shí)現(xiàn)自定義View-創(chuàng)新互聯(lián)
URL標(biāo)題:http://jinyejixie.com/article20/jgijo.html
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