利用Android模仿微信攝像圓環(huán)進度效果實例

發(fā)布時間：2020-09-02 09:02:14 來源：腳本之家閱讀：166 作者：翻滾吧李博欄目：移動開發(fā)

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：

利用Android模仿微信攝像圓環(huán)進度效果實例

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??；第二、三個參數(shù)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(shù)表示是否與中心點填充為扇形，false表示只畫圓弧線；

利用Android模仿微信攝像圓環(huán)進度效果實例

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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利用Android模仿微信攝像圓環(huán)進度效果實例

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