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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，來一起看看詳細的介紹吧。
微信效果：
源碼下載：
github代碼直通車
本地下載
自制效果：
實現過程：
1.自定義圓半徑和圓環顏色屬性：
<declare-styleable name="CiclePercentView"> <attr name="radius" format="integer"/> <attr name="ring_color" format="color"/> </declare-styleable>
2.設置3支畫筆，分別畫圓環，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() ，第一個參數表示圓弧外切矩形大小；第二、三個參數表示起始角度，當前角度，-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
@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，可設置拍攝總時間totalTime;時間轉化為進度范圍為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)
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
以上就是這篇文章的全部內容了，希望本文的內容對大家的學習或者工作具有一定的參考學習價值，如果有疑問大家可以留言交流，謝謝大家對億速云的支持。
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