Android仿視頻加載旋轉(zhuǎn)小球動(dòng)畫效果的實(shí)例代碼

更新時(shí)間：2018年09月04日 16:57:07 作者：萬學(xué)冬

這篇文章主要介紹了Android仿視頻加載旋轉(zhuǎn)小球動(dòng)畫效果的實(shí)例代碼,文中給大家提到了PathMeasure的用法，介紹的非常詳細(xì)，具有一定的參考借鑒價(jià)值，需要的朋友可以參考下

先上個(gè)效果圖，以免大家跑錯(cuò)地了。

嗯，除了只能錄三秒，其他沒啥問題。

下面分析一下怎么實(shí)現(xiàn)上面這個(gè)效果。

理性分析后我們可以看到是幾個(gè)小球繞著一個(gè)圓進(jìn)行運(yùn)動(dòng)，那這里面的重點(diǎn)我們看看什么。

繪制五個(gè)球，沒什么難度，讓球繞圓進(jìn)行運(yùn)動(dòng)，這個(gè)好像我們沒有見到是怎么去實(shí)現(xiàn)了，那下就說這個(gè)。

從本質(zhì)上看，球繞圓運(yùn)動(dòng)，其實(shí)我們可以看作是一個(gè)物體繞指定的路勁運(yùn)動(dòng)，那我們就有下面幾個(gè)東西需要說一下：

1：Path
2：ValueAnimator
3：PathMeasure

前兩個(gè)大家應(yīng)該都見過，一個(gè)是路徑，就是可以自己繪制路線的一個(gè)工具，一個(gè)是動(dòng)畫，用來指定物體運(yùn)動(dòng)的工具，那第三個(gè)是一個(gè)關(guān)于測(cè)量路徑的類。

下面說說PathMeasure的用法。

首先是初始化：

pathMeasure = new PathMeasure(path, false);

兩個(gè)參數(shù)第一個(gè)，第一個(gè)就是我們需要用到的路徑，第二個(gè)參數(shù)意思就是這個(gè)以路徑頭尾是否相連來計(jì)算結(jié)果，通常我們就寫false就行，不會(huì)有問題。

然后是用法：

private float[] mCurrentPositionOne = new float[2];
float value = (Float) 
animation.getAnimatedValue();
pathMeasure.getPosTan(value, mCurrentPositionOne, null);
  我們可以看見把一個(gè)二維數(shù)組放到了getPosTan這個(gè)方法里面，然后還有一個(gè)animation，這里的animation來自哪里呢？來自這里：valueAnimatorOne.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
  @Override
  public void onAnimationUpdate(ValueAnimator animation) {
    // 獲取當(dāng)前點(diǎn)坐標(biāo)封裝到mCurrentPosition
    float value = (Float) animation.getAnimatedValue();
    pathMeasure.getPosTan(value, mCurrentPositionOne, null);
    postInvalidate();
  }
});

看見沒，是動(dòng)畫的監(jiān)聽里面來的，getPosTan的最后一個(gè)參數(shù)通常也就寫null就行了，那么這整個(gè)一行的代碼意思就是當(dāng)動(dòng)畫發(fā)生了變化，就執(zhí)行這行代碼，然后這行代碼會(huì)把這個(gè)時(shí)間點(diǎn)的路徑上的坐標(biāo)賦值給mCurrentPositionOne。

那我們獲取到看這個(gè)路徑上的坐標(biāo)點(diǎn)怎么辦呢？

立馬用來ondraw里面啊，我的小球此時(shí)就可以根據(jù)這個(gè)坐標(biāo)點(diǎn)去繪制自己的位置，這個(gè)的話，當(dāng)動(dòng)畫開始時(shí)，小球就會(huì)不斷接受新的坐標(biāo)，然后不斷重繪，最終產(chǎn)生旋轉(zhuǎn)小球的效果。

我先把屬性動(dòng)畫的代碼貼出來：

if (valueAnimatorOne == null) {
   valueAnimatorOne = ValueAnimator.ofFloat(0, pathMeasure.getLength());
  valueAnimatorOne.setDuration(800);
  // 減速插值器
  valueAnimatorOne.setInterpolator(new DecelerateInterpolator());
  valueAnimatorOne.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
    @Override
    public void onAnimationUpdate(ValueAnimator animation) {
      // 獲取當(dāng)前點(diǎn)坐標(biāo)封裝到mCurrentPosition
      float value = (Float) animation.getAnimatedValue();
      pathMeasure.getPosTan(value, mCurrentPositionOne, null);
      postInvalidate();
    }
  });
  valueAnimatorOne.addListener(new Animator.AnimatorListener() {
    @Override
    public void onAnimationStart(Animator animator) {
      finishAnimateOne = 1;
    }
    @Override
    public void onAnimationEnd(Animator animator) {
      finishAnimateOne = 0;
    }
    @Override
    public void onAnimationCancel(Animator animator) {
    }
    @Override
    public void onAnimationRepeat(Animator animator) {
    }
  });
}
valueAnimatorOne.start();

我寫了個(gè)800，也就是動(dòng)畫的維持時(shí)間，但是我們發(fā)現(xiàn)有啊后幾個(gè)小球，所以我們需要繪制好幾個(gè)小球，然后給他們不同的動(dòng)畫，為什么呢？因?yàn)閯?dòng)畫都一樣，小球就疊加在一起了，我們就只能看見一個(gè)球了。

說到這里的話，我們的目標(biāo)算時(shí)完成了，具體的操作，大家參考以下代碼，或者去：android自定義View索引

里面動(dòng)畫的demo進(jìn)行下載，大家隨意，下面給出代碼：

/**


 * 仿視頻加載動(dòng)畫，旋轉(zhuǎn)的藍(lán)色小球
 */
public class RotaryBall extends View {
  private Path rotationPath;
  private float radius;
  private Paint circlePaintOne;
  private PathMeasure pathMeasure;
  private int finishAnimateOne = 0;  // 用來判斷當(dāng)前動(dòng)畫有沒有開始
  private int finishAnimateTwo = 0;  // 用來判斷當(dāng)前動(dòng)畫有沒有開始
  private int finishAnimateThree = 0;  // 用來判斷當(dāng)前動(dòng)畫有沒有開始
  private int finishAnimateFour = 0;  // 用來判斷當(dāng)前動(dòng)畫有沒有開始
  private int finishAnimateFive = 0;  // 用來判斷當(dāng)前動(dòng)畫有沒有開始
  private Handler handler;
  private float[] mCurrentPositionOne = new float[2];
  private float[] mCurrentPositionTwo = new float[2];
  private float[] mCurrentPositionThree = new float[2];
  private float[] mCurrentPositionFour = new float[2];
  private float[] mCurrentPositionFive = new float[2];
  private ValueAnimator valueAnimatorOne = null;
  private ValueAnimator valueAnimatorTwo = null;
  private ValueAnimator valueAnimatorThree = null;
  private ValueAnimator valueAnimatorFour = null;
  private ValueAnimator valueAnimatorFive = null;
  private int currentStatus = -1;  //-1表示第一次運(yùn)行，0表示動(dòng)畫結(jié)束或者沒開始，1表示正在運(yùn)動(dòng)中
  private boolean animateOrNot = true;  //用來決定是否開啟動(dòng)畫
  public RotaryBall(Context context) {
    super(context);
    initData();
  }
  public RotaryBall(Context context, AttributeSet attrs) {
    super(context, attrs);
    initData();
  }
  private void initData() {
    rotationPath = new Path();
    circlePaintOne = new Paint();
    circlePaintOne.setColor(Color.BLUE);
    circlePaintOne.setAntiAlias(true);
    handler = new Handler() {
      @Override
      public void handleMessage(Message msg) {
        super.handleMessage(msg);
        switch (msg.what) {
          case 4:
            if (finishAnimateOne == 0) {
              startAnimatorOne();
            }
            if (finishAnimateTwo == 0) {
              startAnimatorTwo();
            }
            if (finishAnimateThree == 0) {
              startAnimatorThree();
            }
            if (finishAnimateFour == 0) {
              startAnimatorFour();
            }
            if (finishAnimateFive == 0) {
              startAnimatorFive();
            }
            currentStatus = 0;
        }
      }
    };
  }
  @Override
  protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    radius = getMeasuredWidth() / 2;
  }
  @Override
  protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);
//    rotationPath.addCircle(radius, radius, radius - 10, CW);
    rotationPath.moveTo(radius, 0 + 10);
    rotationPath.cubicTo(radius, 0 + 10, radius * 2 - 10, 0 + 10, radius * 2 - 10, radius);
    rotationPath.cubicTo(radius * 2 - 10, radius, radius * 2 - 10, radius * 2 - 10, radius, radius * 2 - 10);
    rotationPath.cubicTo(radius, radius * 2 - 10, 0 + 10, radius * 2 - 10, 0 + 10, radius);
    rotationPath.cubicTo(0 + 10, radius, 0 + 10, 0 + 10, radius, 0 + 10);
    rotationPath.close();
    pathMeasure = new PathMeasure(rotationPath, false);
    //下面繪制不同半徑的小圓
    canvas.drawCircle(mCurrentPositionOne[0], mCurrentPositionOne[1], 10, circlePaintOne);
    canvas.drawCircle(mCurrentPositionTwo[0], mCurrentPositionTwo[1], 9, circlePaintOne);
    canvas.drawCircle(mCurrentPositionThree[0], mCurrentPositionThree[1], 7, circlePaintOne);
    canvas.drawCircle(mCurrentPositionFour[0], mCurrentPositionFour[1], 5, circlePaintOne);
    canvas.drawCircle(mCurrentPositionFive[0], mCurrentPositionFive[1], 3, circlePaintOne);
    if (currentStatus == -1) {
      Message message = new Message();
      message.what = 4;
      handler.sendMessage(message);
    }
    if (animateOrNot) {
      if (currentStatus == 0) {
        currentStatus = 1;
        new Thread() {      //用線程來統(tǒng)一五個(gè)圓的周期
          @Override
          public void run() {
            super.run();
            try {
              Log.d("thread", "thread");
              Thread.sleep(1600);
              Message message = new Message();
              message.what = 4;
              handler.sendMessage(message);
            } catch (InterruptedException e) {
              e.printStackTrace();
            }
          }
        }.start();
      }
    }
  }
  //供外部調(diào)用，開始動(dòng)畫
  public void startAnimate() {
    if (!animateOrNot) {
      animateOrNot = true;
      currentStatus = -1;
      invalidate();
    }
  }
  //供外部調(diào)用，停止動(dòng)畫
  public void stopAnimate() {
    if (animateOrNot) {
      animateOrNot = false;
    }
  }
  //界面被銷毀
  @Override
  protected void onDetachedFromWindow() {
    super.onDetachedFromWindow();
    stopAnimate();
    clearAllAnimation();
  }
  //清除所有動(dòng)畫效果
  private void clearAllAnimation() {
    if (valueAnimatorOne != null){
      if (valueAnimatorOne.isRunning()){
        valueAnimatorOne.cancel();
      }
      valueAnimatorOne.removeAllUpdateListeners();
      valueAnimatorOne = null;
    }
    if (valueAnimatorTwo != null){
      if (valueAnimatorTwo.isRunning()){
        valueAnimatorTwo.cancel();
      }
      valueAnimatorTwo.removeAllUpdateListeners();
      valueAnimatorTwo = null;
    }
    if (valueAnimatorThree != null){
      if (valueAnimatorThree.isRunning()){
        valueAnimatorThree.cancel();
      }
      valueAnimatorThree.removeAllUpdateListeners();
      valueAnimatorThree = null;
    }
    if (valueAnimatorFour != null){
      if (valueAnimatorFour.isRunning()){
        valueAnimatorFour.cancel();
      }
      valueAnimatorFour.removeAllUpdateListeners();
      valueAnimatorFour = null;
    }
    if (valueAnimatorFive != null){
      if (valueAnimatorFive.isRunning()){
        valueAnimatorFive.cancel();
      }
      valueAnimatorFive.removeAllUpdateListeners();
      valueAnimatorFive = null;
    }
  }
  //開始第一個(gè)小球的動(dòng)畫
  private void startAnimatorOne() {
    if (valueAnimatorOne == null) {
      Log.d("valueAnimatorOne", "valueAnimatorOne");
      valueAnimatorOne = ValueAnimator.ofFloat(0, pathMeasure.getLength());
      valueAnimatorOne.setDuration(800);
      // 減速插值器
      valueAnimatorOne.setInterpolator(new DecelerateInterpolator());
      valueAnimatorOne.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
        @Override
        public void onAnimationUpdate(ValueAnimator animation) {
          // 獲取當(dāng)前點(diǎn)坐標(biāo)封裝到mCurrentPosition
          float value = (Float) animation.getAnimatedValue();
          pathMeasure.getPosTan(value, mCurrentPositionOne, null);
          postInvalidate();
        }
      });
      valueAnimatorOne.addListener(new Animator.AnimatorListener() {
        @Override
        public void onAnimationStart(Animator animator) {
          finishAnimateOne = 1;
        }
        @Override
        public void onAnimationEnd(Animator animator) {
          finishAnimateOne = 0;
        }
        @Override
        public void onAnimationCancel(Animator animator) {
        }
        @Override
        public void onAnimationRepeat(Animator animator) {
        }
      });
    }
    valueAnimatorOne.start();
  }
  //開始第二個(gè)小球的動(dòng)畫
  private void startAnimatorTwo() {
    if (valueAnimatorTwo == null) {
      valueAnimatorTwo = ValueAnimator.ofFloat(0, pathMeasure.getLength());
      valueAnimatorTwo.setDuration(1000);
      // 減速插值器
      valueAnimatorTwo.setInterpolator(new DecelerateInterpolator());
      valueAnimatorTwo.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
        @Override
        public void onAnimationUpdate(ValueAnimator animation) {
          float value = (Float) animation.getAnimatedValue();
          // 獲取當(dāng)前點(diǎn)坐標(biāo)封裝到mCurrentPosition
          pathMeasure.getPosTan(value, mCurrentPositionTwo, null);
          postInvalidate();
        }
      });
      valueAnimatorTwo.addListener(new Animator.AnimatorListener() {
        @Override
        public void onAnimationStart(Animator animator) {
          finishAnimateTwo = 1;
        }
        @Override
        public void onAnimationEnd(Animator animator) {
          finishAnimateTwo = 0;
        }
        @Override
        public void onAnimationCancel(Animator animator) {
        }
        @Override
        public void onAnimationRepeat(Animator animator) {
        }
      });
    }
    valueAnimatorTwo.start();
  }
  //開始第三個(gè)小球的動(dòng)畫
  private void startAnimatorThree() {
    if (valueAnimatorThree == null) {
      valueAnimatorThree = ValueAnimator.ofFloat(0, pathMeasure.getLength());
      valueAnimatorThree.setDuration(1200);
      // 減速插值器
      valueAnimatorThree.setInterpolator(new DecelerateInterpolator());
      valueAnimatorThree.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
        @Override
        public void onAnimationUpdate(ValueAnimator animation) {
          float value = (Float) animation.getAnimatedValue();
          // 獲取當(dāng)前點(diǎn)坐標(biāo)封裝到mCurrentPosition
          pathMeasure.getPosTan(value, mCurrentPositionThree, null);
          postInvalidate();
        }
      });
      valueAnimatorThree.addListener(new Animator.AnimatorListener() {
        @Override
        public void onAnimationStart(Animator animator) {
          finishAnimateThree = 1;
        }
        @Override
        public void onAnimationEnd(Animator animator) {
          finishAnimateThree = 0;
        }
        @Override
        public void onAnimationCancel(Animator animator) {
        }
        @Override
        public void onAnimationRepeat(Animator animator) {
        }
      });
    }
    valueAnimatorThree.start();
  }
  //開始第四個(gè)小球的動(dòng)畫
  private void startAnimatorFour() {
    if (valueAnimatorFour == null) {
      valueAnimatorFour = ValueAnimator.ofFloat(0, pathMeasure.getLength());
      valueAnimatorFour.setDuration(1400);
      // 減速插值器
      valueAnimatorFour.setInterpolator(new DecelerateInterpolator());
      valueAnimatorFour.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
        @Override
        public void onAnimationUpdate(ValueAnimator animation) {
          float value = (Float) animation.getAnimatedValue();
          // 獲取當(dāng)前點(diǎn)坐標(biāo)封裝到mCurrentPosition
          pathMeasure.getPosTan(value, mCurrentPositionFour, null);
          postInvalidate();
        }
      });
      valueAnimatorFour.addListener(new Animator.AnimatorListener() {
        @Override
        public void onAnimationStart(Animator animator) {
          finishAnimateFour = 1;
        }
        @Override
        public void onAnimationEnd(Animator animator) {
          finishAnimateFour = 0;
        }
        @Override
        public void onAnimationCancel(Animator animator) {
        }
        @Override
        public void onAnimationRepeat(Animator animator) {
        }
      });
    }
    valueAnimatorFour.start();
  }
  //開始第五個(gè)小球的動(dòng)畫
  private void startAnimatorFive() {
    if (valueAnimatorFive == null) {
      valueAnimatorFive = ValueAnimator.ofFloat(0, pathMeasure.getLength());
      valueAnimatorFive.setDuration(1600);
      // 減速插值器
      valueAnimatorFive.setInterpolator(new DecelerateInterpolator());
      valueAnimatorFive.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
        @Override
        public void onAnimationUpdate(ValueAnimator animation) {
          float value = (Float) animation.getAnimatedValue();
          // 獲取當(dāng)前點(diǎn)坐標(biāo)封裝到mCurrentPosition
          pathMeasure.getPosTan(value, mCurrentPositionFive, null);
          postInvalidate();
        }
      });
      valueAnimatorFive.addListener(new Animator.AnimatorListener() {
        @Override
        public void onAnimationStart(Animator animator) {
          finishAnimateFive = 1;
        }
        @Override
        public void onAnimationEnd(Animator animator) {
          finishAnimateFive = 0;
        }
        @Override
        public void onAnimationCancel(Animator animator) {
        }
        @Override
        public void onAnimationRepeat(Animator animator) {
        }
      });
    }
    valueAnimatorFive.start();
  }
}

總結(jié)

以上所述是小編給大家介紹的Android仿視頻加載旋轉(zhuǎn)小球動(dòng)畫實(shí)例代碼，希望對(duì)大家有所幫助，如果大家有任何疑問請(qǐng)給我留言，小編會(huì)及時(shí)回復(fù)大家的。在此也非常感謝大家對(duì)腳本之家網(wǎng)站的支持！

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