Android自定義View系列之Path繪制仿支付寶支付成功動(dòng)畫

更新時(shí)間：2016年12月14日 09:26:31 作者：lizebin_bin

這篇文章主要為大家詳細(xì)介紹了Android自定義View系列之Path繪制仿支付寶支付成功動(dòng)畫，具有一定的參考價(jià)值，感興趣的小伙伴們可以參考一下

前言

使用支付寶付款時(shí)，我們可以看到成功或者失敗都會(huì)有個(gè)動(dòng)畫提示，如果我們需要做這樣的效果的話，當(dāng)然，你可以讓設(shè)計(jì)師給你做個(gè)GIF，但是我們知道圖像比較耗內(nèi)存的，我們自己可以用代碼實(shí)現(xiàn)還是代碼實(shí)現(xiàn)好點(diǎn)吧。

效果

實(shí)現(xiàn)方法

首先我們需要了解PathMeasure這個(gè)類，這個(gè)類我們可以理解為用來(lái)管理Path。我們主要看幾個(gè)方法。

PathMeasure()： 構(gòu)造方法，實(shí)例化一個(gè)對(duì)象

PathMeasure(Path path,boolean isClosed)：傳入Path對(duì)象和是否閉合，path對(duì)象不能為空

getLength()：獲取當(dāng)前輪廓、外形的總長(zhǎng)度，如果沒有設(shè)置Path對(duì)象，返回0

getSegment(float startD,float stopD,Path dst,boolean startWithMoveTo)：調(diào)用這個(gè)方法，我們可以獲取到指定范圍內(nèi)的一段輪廓，存入到dst參數(shù)中。所以，這個(gè)方法傳入的參數(shù)分別為長(zhǎng)度起始值、結(jié)束值、裝這一段路徑的Path對(duì)象、是否MoveTo。另外，這個(gè)方法返回值為Boolean類型，如果getLength為0的話，返回false，或者startD > stopD，同樣返回false。

setPath(Path path , boolean isClosed)：給當(dāng)前PathMeasure對(duì)象設(shè)置Path

nextContour()：移動(dòng)到下一個(gè)輪廓

然后我們需要?jiǎng)悠饋?lái)，我們知道invalidate()方法可以刷新界面，也就是重新調(diào)用onDraw()方法，所以我們要不停調(diào)用invalidate方法，在onDraw方法中改變參數(shù)，這樣實(shí)現(xiàn)動(dòng)的效果。所以可以用到剛剛介紹的getSegment方法，不斷改變獲取的范圍，從0 * getLength，到1 * getLength，最后繪制完整。所以我們需要一個(gè)在一秒內(nèi)或兩秒內(nèi)一個(gè)從0到1的值的變化，so，我們使用ValueAnimator這個(gè)類來(lái)實(shí)現(xiàn)。

//實(shí)例化對(duì)象
mCircleAnimator = ValueAnimator.ofFloat(0, 1);
//設(shè)置時(shí)長(zhǎng)為1000ms
mCircleAnimator.setDuration(1000);
//開始動(dòng)畫
mCircleAnimator.start();
//設(shè)置動(dòng)畫監(jiān)聽
mCircleAnimator.addUpdateListener(this);

動(dòng)畫開始后，在監(jiān)聽方法中獲取當(dāng)前進(jìn)度并且重繪圖像

mCirclePercent = (float)animation.getAnimatedValue();
invalidate();

在onDraw方法中，繪制圖像

//畫圓
mPathCircle.addCircle(getWidth() / 2, getWidth() / 2, getWidth() / 2 - mLineWidth, Path.Direction.CW);
mPathMeasure.setPath(mPathCircle, false);
mPathMeasure.getSegment(0, mCirclePercent * mPathMeasure.getLength(), mPathCircleDst, true);
canvas.drawPath(mPathCircleDst, mPaint);

附上源碼，歡迎點(diǎn)評(píng)

package com.mintmedical.wavedemo;

import android.animation.ValueAnimator;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.PathMeasure;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;

/**
 * Created by MooreLi on 2016/12/12.
 */

public class ResultAnimation extends View implements ValueAnimator.AnimatorUpdateListener {
 private Context mContext;
 /**
  * paint對(duì)象
  */
 private Paint mPaint;
 /**
  * Path和對(duì)應(yīng)的空Path用來(lái)填充
  */
 private Path mPathCircle;
 private Path mPathCircleDst;
 private Path mPathRight;
 private Path mPathRightDst;
 private Path mPathWrong1;
 private Path mPathWrong2;
 private Path mPathWrong1Dst;
 private Path mPathWrong2Dst;
 /**
  * Path管理
  */
 private PathMeasure mPathMeasure;
 /**
  * 動(dòng)畫
  */
 private ValueAnimator mCircleAnimator;
 private ValueAnimator mRightAnimator;
 private ValueAnimator mWrong1Animator;
 private ValueAnimator mWrong2Animator;
 /**
  * 當(dāng)前繪制進(jìn)度占總Path長(zhǎng)度百分比
  */
 private float mCirclePercent;
 private float mRightPercent;
 private float mWrong1Percent;
 private float mWrong2Percent;
 /**
  * 線寬
  */
 private int mLineWidth;
 /**
  * 正確動(dòng)畫 錯(cuò)誤動(dòng)畫
  */
 public static final int RESULT_RIGHT = 1;
 public static final int RESULT_WRONG = 2;
 /**
  * 當(dāng)前結(jié)果類型
  */
 private int mResultType = RESULT_WRONG;

 public ResultAnimation(Context context) {
  super(context);
  mContext = context;
  init();
 }

 public ResultAnimation(Context context, AttributeSet attrs) {
  super(context, attrs);
  mContext = context;
  init();
 }

 public ResultAnimation(Context context, AttributeSet attrs, int defStyleAttr) {
  super(context, attrs, defStyleAttr);
  mContext = context;
  init();
 }

 private void init() {
  mLineWidth = dp2px(3);
  mPaint = new Paint();
  mPaint.setAntiAlias(true);
  mPaint.setStrokeWidth(mLineWidth);
  mPaint.setStyle(Paint.Style.STROKE);
  mPaint.setColor(Color.GREEN);

  initPath();
 }

 private void initPath() {
  mPathCircle = new Path();
  mPathCircleDst = new Path();
  mPathRight = new Path();
  mPathRightDst = new Path();
  mPathWrong1 = new Path();
  mPathWrong2 = new Path();
  mPathWrong1Dst = new Path();
  mPathWrong2Dst = new Path();

  mPathMeasure = new PathMeasure();

  //實(shí)例化對(duì)象
  mCircleAnimator = ValueAnimator.ofFloat(0, 1);
  //設(shè)置時(shí)長(zhǎng)為1000ms
  mCircleAnimator.setDuration(1000);
  //開始動(dòng)畫
  mCircleAnimator.start();
  //設(shè)置動(dòng)畫監(jiān)聽
  mCircleAnimator.addUpdateListener(this);

  mRightAnimator = ValueAnimator.ofFloat(0, 1);
  mRightAnimator.setDuration(500);
  mRightAnimator.addUpdateListener(this);

  mWrong1Animator = ValueAnimator.ofFloat(0, 1);
  mWrong1Animator.setDuration(300);
  mWrong1Animator.addUpdateListener(this);
  mWrong2Animator = ValueAnimator.ofFloat(0, 1);
  mWrong2Animator.setDuration(300);
  mWrong2Animator.addUpdateListener(this);

 }

 @Override
 protected void onDraw(Canvas canvas) {
  super.onDraw(canvas);
  if (mResultType == RESULT_RIGHT) {
   mPaint.setColor(Color.GREEN);
  } else {
   mPaint.setColor(Color.RED);
  }

  //畫圓
  mPathCircle.addCircle(getWidth() / 2, getWidth() / 2, getWidth() / 2 - mLineWidth, Path.Direction.CW);
  mPathMeasure.setPath(mPathCircle, false);
  mPathMeasure.getSegment(0, mCirclePercent * mPathMeasure.getLength(), mPathCircleDst, true);
  canvas.drawPath(mPathCircleDst, mPaint);
  if (mResultType == RESULT_RIGHT) {
   //畫對(duì)勾
   mPathRight.moveTo(getWidth() / 4, getWidth() / 2);
   mPathRight.lineTo(getWidth() / 2, getWidth() / 4 * 3);
   mPathRight.lineTo(getWidth() / 4 * 3, getWidth() / 4);
   if (mCirclePercent == 1) {
    mPathMeasure.nextContour();
    mPathMeasure.setPath(mPathRight, false);
    mPathMeasure.getSegment(0, mRightPercent * mPathMeasure.getLength(), mPathRightDst, true);
    canvas.drawPath(mPathRightDst, mPaint);
   }
  } else {
   mPathWrong1.moveTo(getWidth() / 4 * 3, getWidth() / 4);
   mPathWrong1.lineTo(getWidth() / 4, getWidth() / 4 * 3);

   mPathWrong2.moveTo(getWidth() / 4, getWidth() / 4);
   mPathWrong2.lineTo(getWidth() / 4 * 3, getWidth() / 4 * 3);

   if (mCirclePercent == 1) {
    mPathMeasure.nextContour();
    mPathMeasure.setPath(mPathWrong1, false);
    mPathMeasure.getSegment(0, mWrong1Percent * mPathMeasure.getLength(), mPathWrong1Dst, true);
    canvas.drawPath(mPathWrong1Dst, mPaint);
   }
   if (mWrong1Percent == 1) {
    mPathMeasure.nextContour();
    mPathMeasure.setPath(mPathWrong2, false);
    mPathMeasure.getSegment(0, mWrong2Percent * mPathMeasure.getLength(), mPathWrong2Dst, true);
    canvas.drawPath(mPathWrong2Dst, mPaint);
   }
  }
 }

 private int dp2px(int dp) {
  float scale = mContext.getResources().getDisplayMetrics().density;
  return (int) (scale * dp + 0.5f);
 }

 @Override
 public void onAnimationUpdate(ValueAnimator animation) {
  //圓形動(dòng)畫
  if (animation.equals(mCircleAnimator)) {
   mCirclePercent = (float) animation.getAnimatedValue();
   invalidate();
   Log.e("TEST","percent:"+mCirclePercent);
   if (mCirclePercent == 1) {
    if (mResultType == RESULT_RIGHT)
     mRightAnimator.start();
    else
     mWrong1Animator.start();
   }
  }
  //正確時(shí) 對(duì)勾動(dòng)畫
  else if (animation.equals(mRightAnimator)) {
   mRightPercent = (float) animation.getAnimatedValue();
   invalidate();
  }
  //錯(cuò)誤時(shí) 右側(cè)動(dòng)畫
  else if (animation.equals(mWrong1Animator)) {
   mWrong1Percent = (float) animation.getAnimatedValue();
   invalidate();
   if (mWrong1Percent == 1) {
    mWrong2Animator.start();
   }
  }
  //錯(cuò)誤時(shí) 左側(cè)動(dòng)畫
  else if (animation.equals(mWrong2Animator)) {
   mWrong2Percent = (float) animation.getAnimatedValue();
   invalidate();
  }
 }

 public void setmResultType(int mResultType) {
  this.mResultType = mResultType;
  invalidate();
 }

 /**
  * 固定寫死了寬高，可重新手動(dòng)調(diào)配
  *
  * @param widthMeasureSpec
  * @param heightMeasureSpec
  */
 @Override
 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
  super.onMeasure(widthMeasureSpec, heightMeasureSpec);
  setMeasuredDimension(dp2px(50), dp2px(50));
 }
}

github地址: https://github.com/lizebinbin

以上就是本文的全部?jī)?nèi)容，希望對(duì)大家的學(xué)習(xí)有所幫助，也希望大家多多支持腳本之家。

您可能感興趣的文章: