利用Android模仿微信攝像圓環(huán)進度效果實例
前言
大家在平時的生活上遇到新奇的事情,都要立即打開微信視頻錄下來發(fā)給朋友看看。這個錄制進度條看起來還不錯哦,就仿著寫了一個,不是樣式完全的高仿,是功能的仿制。下面話不多說了,來一起看看詳細(xì)的介紹吧。
微信效果:
源碼下載:
自制效果:
實現(xiàn)過程:
1.自定義圓半徑和圓環(huán)顏色屬性:
<declare-styleable name="CiclePercentView"> <attr name="radius" format="integer"/> <attr name="ring_color" format="color"/> </declare-styleable>
2.設(shè)置3支畫筆,分別畫圓環(huán),背景淺白色,中心白色圓。
private void init() { paint = new Paint(); paint.setColor(ringColor); paint.setStyle(Paint.Style.STROKE); paint.setAntiAlias(true); paint.setStrokeWidth(14); bgPaint = new Paint(); bgPaint.setAntiAlias(true); bgPaint.setColor(getResources().getColor(R.color.halfwhite)); centerPaint = new Paint(); centerPaint.setAntiAlias(true); centerPaint.setColor(Color.WHITE); //起始角度 startAngle = -90; }
3.依次畫背景圓,中心圓,圓弧。canvas.drawArc()
,第一個參數(shù)表示圓弧外切矩形大?。坏诙?、三個參數(shù)表示起始角度,當(dāng)前角度,-90度為12點方向,0度為3點方向,這里用-90度作為起始;第四個參數(shù)表示是否與中心點填充為扇形,false表示只畫圓弧線;
畫圓弧drawArc()方法參數(shù)
@Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); //畫圓弧 RectF rectf = new RectF(6,6,dp2px(radius-2),dp2px(radius-2)); canvas.drawCircle(getMeasuredWidth()/2,getMeasuredHeight()/2,dp2px(radius)/2,bgPaint); canvas.drawCircle(getMeasuredWidth()/2,getMeasuredHeight()/2,dp2px(radius/3)/2,centerPaint); canvas.drawArc(rectf,startAngle,curAngle,false,paint); }
4.計時器,每100毫秒更新一次進度,可設(shè)置拍攝總時間totalTime;時間轉(zhuǎn)化為進度范圍為0-100;
public void countDown(final int totalTime){ countDownTimer = new CountDownTimer(totalTime, (long)(totalTime/100f)) { @Override public void onTick(long millisUntilFinished) { curPercentate = (int) ((totalTime-millisUntilFinished)/(float)totalTime*100); percentToAngle(curPercentate); } @Override public void onFinish() { curPercentate = 0; percentToAngle(curPercentate); } }.start(); }
5.按下開始拍攝,只要抬起就完成拍攝,進度恢復(fù)為0。
@Override public boolean onTouchEvent(MotionEvent event) { switch (event.getAction()){ case MotionEvent.ACTION_DOWN: countDown(countdownTime); break; case MotionEvent.ACTION_UP: countDownTimer.cancel(); curPercentate = 0; percentToAngle(curPercentate); break; } return true; }
CiclePercentView類完整代碼:
public class CiclePercentView extends View{ private Paint paint; private int curAngle; private int curPercentate; private Paint bgPaint,centerPaint; private int radius; private int ringColor; private int startAngle; private int countdownTime; private CountDownTimer countDownTimer; public CiclePercentView(Context context) { super(context); init(); } public CiclePercentView(Context context, @Nullable AttributeSet attrs) { super(context, attrs); TypedArray array = context.obtainStyledAttributes(attrs,R.styleable.CiclePercentView); radius = array.getInt(R.styleable.CiclePercentView_radius,85); ringColor = array.getColor(R.styleable.CiclePercentView_ring_color,Color.GREEN); array.recycle(); init(); } private void init() { paint = new Paint(); paint.setColor(ringColor); paint.setStyle(Paint.Style.STROKE); paint.setAntiAlias(true); paint.setStrokeWidth(14); bgPaint = new Paint(); bgPaint.setAntiAlias(true); bgPaint.setColor(getResources().getColor(R.color.halfwhite)); centerPaint = new Paint(); centerPaint.setAntiAlias(true); centerPaint.setColor(Color.WHITE); //起始角度 startAngle = -90; } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); //畫圓弧 RectF rectf = new RectF(6,6,dp2px(radius-2),dp2px(radius-2)); canvas.drawCircle(getMeasuredWidth()/2,getMeasuredHeight()/2,dp2px(radius)/2,bgPaint); canvas.drawCircle(getMeasuredWidth()/2,getMeasuredHeight()/2,dp2px(radius/3)/2,centerPaint); canvas.drawArc(rectf,startAngle,curAngle,false,paint); } private void percentToAngle(int percentage){ curAngle = (int) (percentage/100f*360); invalidate(); } public void setCountdownTime(int countdownTime){ this.countdownTime = countdownTime; } public void countDown(final int totalTime){ countDownTimer = new CountDownTimer(totalTime, (long)(totalTime/100f)) { @Override public void onTick(long millisUntilFinished) { curPercentate = (int) ((totalTime-millisUntilFinished)/(float)totalTime*100); percentToAngle(curPercentate); } @Override public void onFinish() { curPercentate = 0; percentToAngle(curPercentate); } }.start(); } @Override public boolean onTouchEvent(MotionEvent event) { switch (event.getAction()){ case MotionEvent.ACTION_DOWN: countDown(countdownTime); break; case MotionEvent.ACTION_UP: countDownTimer.cancel(); curPercentate = 0; percentToAngle(curPercentate); break; } return true; } private int dp2px(int dp){ return (int) (getContext().getResources().getDisplayMetrics().density*dp + 0.5); } }
附:Android Canvas drawArc方法介紹
public void drawArc(RectF oval, float startAngle, float sweepAngle, boolean useCenter, Paint paint)
- oval :指定圓弧的外輪廓矩形區(qū)域。
- startAngle: 圓弧起始角度,單位為度。
- sweepAngle: 圓弧掃過的角度,順時針方向,單位為度。
- useCenter: 如果為True時,在繪制圓弧時將圓心包括在內(nèi),通常用來繪制扇形。
- paint: 繪制圓弧的畫板屬性,如顏色,是否填充等。
下面演示drawArc的四種不同用法,
1. 填充圓弧但不含圓心:
mPaints[0] = new Paint(); mPaints[0].setAntiAlias(true); mPaints[0].setStyle(Paint.Style.FILL); mPaints[0].setColor(0x88FF0000); mUseCenters[0] = false;
2. 填充圓弧帶圓心(扇形)
mPaints[1] = new Paint(mPaints[0]); mPaints[1].setColor(0x8800FF00); mUseCenters[1] = true;
3. 只繪圓周,不含圓心
mPaints[2] = new Paint(mPaints[0]); mPaints[2].setStyle(Paint.Style.STROKE); mPaints[2].setStrokeWidth(4); mPaints[2].setColor(0x880000FF); mUseCenters[2] = false;
4. 只繪圓周,帶圓心(扇形)
mPaints[3] = new Paint(mPaints[2]); mPaints[3].setColor(0x88888888); mUseCenters[3] = true;
總結(jié)
以上就是這篇文章的全部內(nèi)容了,希望本文的內(nèi)容對大家的學(xué)習(xí)或者工作具有一定的參考學(xué)習(xí)價值,如果有疑問大家可以留言交流,謝謝大家對腳本之家的支持。
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