animation之objectAnimator_html/css_WEB-ITnose

这次借助github上的开源项目ShapeLoadingView来学习下ObjectAnimator和animatorSet.
代码结构目录：

1. ShapeLoadingView.java
2. LoadingView.java
   LoadingView是绘制三个基本图形的类。
   ShapeLoadingView初始化图形并操作图形进行动画。
   下面上加了注释的代码：

package com.mingle.widget;import android.annotation.TargetApi;import android.content.Context;import android.content.res.TypedArray;import android.os.Build;import android.text.TextUtils;import android.util.AttributeSet;import android.view.Gravity;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.view.animation.AccelerateInterpolator;import android.view.animation.DecelerateInterpolator;import android.widget.FrameLayout;import android.widget.ImageView;import android.widget.TextView;import com.mingle.shapeloading.R;import com.nineoldandroids.animation.Animator;import com.nineoldandroids.animation.AnimatorSet;import com.nineoldandroids.animation.ObjectAnimator;/** * Created by zzz40500 on 15/4/6. */public class LoadingView extends FrameLayout {    private static final int ANIMATION_DURATION = 500;    private static  float mDistance = 200;    private ShapeLoadingView mShapeLoadingView;    private ImageView mIndicationIm;    private TextView mLoadTextView;    private int mTextAppearance;    private String mLoadText;    public LoadingView(Context context) {        super(context);    }    public LoadingView(Context context, AttributeSet attrs) {        //构造函数        super(context, attrs, 0);        init(context, attrs);    }    private void init(Context context, AttributeSet attrs) {        //这里是通过自定义属性来显示字符串        TypedArray typedArray = context                .obtainStyledAttributes(attrs, R.styleable.LoadingView);        mLoadText = typedArray.getString(R.styleable.LoadingView_loadingText);        mTextAppearance = typedArray.getResourceId(R.styleable.LoadingView_loadingTextAppearance, -1);        typedArray.recycle();    }    public LoadingView(Context context, AttributeSet attrs, int defStyleAttr) {        //构造函数        super(context, attrs, defStyleAttr);        init(context, attrs);    }    //这里定义了一个针对LL版本的构造函数，我这可能因为sdk版本这里会报错，如果报错注释掉就行了    @TargetApi(Build.VERSION_CODES.LOLLIPOP)    public LoadingView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {        super(context, attrs, defStyleAttr, defStyleRes);        init(context, attrs);    }    //dp和像素的转换    public int dip2px(float dipValue) {        final float scale = getContext().getResources().getDisplayMetrics().density;        return (int) (dipValue * scale + 0.5f);    }    //引入布局    @Override    protected void onFinishInflate() {        super.onFinishInflate();        View view = LayoutInflater.from(getContext()).inflate(R.layout.load_view, null);        mDistance = dip2px(54f);        LayoutParams layoutParams = new LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);        layoutParams.gravity = Gravity.CENTER;        mShapeLoadingView = (ShapeLoadingView) view.findViewById(R.id.shapeLoadingView);        mIndicationIm = (ImageView) view.findViewById(R.id.indication);        mLoadTextView = (TextView) view.findViewById(R.id.promptTV);        if (mTextAppearance != -1) {            mLoadTextView.setTextAppearance(getContext(), mTextAppearance);        }        setLoadingText(mLoadText);        //显示绘画布局        addView(view, layoutParams);        //这里是设计一个延时 每隔900调用一次跌落，相当于900ms是一次动画的周期        this.postDelayed(new Runnable() {            @Override            public void run() {                freeFall();            }        }, 900);    }    public void setLoadingText(CharSequence loadingText) {        if (TextUtils.isEmpty(loadingText)) {            mLoadTextView.setVisibility(GONE);        } else {            mLoadTextView.setVisibility(VISIBLE);        }        mLoadTextView.setText(loadingText);    }    /** * 上抛，上抛是动画的核心，上抛是两个组合动作：1，图形进行旋转；2，图形向上平移，同时还有下面阴影部分随着图形位置变化 * 进行的跟随变化。这里使用了ObjectAnimator来控制每个动画的动作，最后使用AnimatorSet将三个部分组合在一起。 * 看一下具体的动作 */    public void upThrow() {        //mShapeLoadingView就是LoadingView里面绘制的图形买第一个objectAnimator控制它进行平移        //使用objectAnimator.ofFloat及参数translationY来进行纵向的平移        ObjectAnimator objectAnimator = ObjectAnimator.ofFloat(mShapeLoadingView, "translationY", mDistance, 0);        //动画下部的阴影这里使用ofFloat及参数scaleX来进行X轴的缩放，02f-1是缩放比例 阴影在20%到100%之间变化        ObjectAnimator scaleIndication = ObjectAnimator.ofFloat(mIndicationIm, "scaleX", 0.2f, 1);        //这段是对图形做一个旋转的动作        ObjectAnimator objectAnimator1 = null;        switch (mShapeLoadingView.getShape()) {            case SHAPE_RECT:                objectAnimator1 = ObjectAnimator.ofFloat(mShapeLoadingView, "rotation", 0, -120);                break;            case SHAPE_CIRCLE:                objectAnimator1 = ObjectAnimator.ofFloat(mShapeLoadingView, "rotation", 0, 180);                break;            case SHAPE_TRIANGLE:                objectAnimator1 = ObjectAnimator.ofFloat(mShapeLoadingView, "rotation", 0, 180);                break;        }        //设置animation的持续时间，通过setDuration.        objectAnimator.setDuration(ANIMATION_DURATION);        objectAnimator1.setDuration(ANIMATION_DURATION);        //设置一个减速插值器        objectAnimator.setInterpolator(new DecelerateInterpolator(factor));        objectAnimator1.setInterpolator(new DecelerateInterpolator(factor));        AnimatorSet animatorSet = new AnimatorSet();        animatorSet.setDuration(ANIMATION_DURATION);        //animatorSet的方法playtogther让三个动画同时运行        animatorSet.playTogether(objectAnimator, objectAnimator1, scaleIndication);        animatorSet.addListener(new Animator.AnimatorListener() {            @Override            public void onAnimationStart(Animator animation) {            }            @Override            public void onAnimationEnd(Animator animation) {                freeFall();            }            @Override            public void onAnimationCancel(Animator animation) {            }            @Override            public void onAnimationRepeat(Animator animation) {            }        });        animatorSet.start();    }    public float factor = 1.2f;    /** * 下落 */    public void freeFall() {        //主要的点和上抛一致不讲了        ObjectAnimator objectAnimator = ObjectAnimator.ofFloat(mShapeLoadingView, "translationY", 0, mDistance);        ObjectAnimator scaleIndication = ObjectAnimator.ofFloat(mIndicationIm, "scaleX", 1, 0.2f);        objectAnimator.setDuration(ANIMATION_DURATION);        objectAnimator.setInterpolator(new AccelerateInterpolator(factor));        AnimatorSet animatorSet = new AnimatorSet();        animatorSet.setDuration(ANIMATION_DURATION);        animatorSet.playTogether(objectAnimator, scaleIndication);        animatorSet.addListener(new Animator.AnimatorListener() {            @Override            public void onAnimationStart(Animator animation) {            }            @Override            public void onAnimationEnd(Animator animation) {                //下落到底端改变图形                mShapeLoadingView.changeShape();                upThrow();            }            @Override            public void onAnimationCancel(Animator animation) {            }            @Override            public void onAnimationRepeat(Animator animation) {            }        });        animatorSet.start();    }}

package com.mingle.widget;import android.annotation.TargetApi;import android.content.Context;import android.graphics.Canvas;import android.graphics.Paint;import android.graphics.Path;import android.os.Build;import android.util.AttributeSet;import android.view.View;import com.mingle.shapeloading.R;/** * Created by zzz40500 on 15/4/4. */public class ShapeLoadingView extends View {    private static final float genhao3 = 1.7320508075689f;    private static  final  float mTriangle2Circle =0.25555555f;    private Shape mShape = Shape.SHAPE_CIRCLE;    /** * 用贝赛尔曲线画圆 */    private float mMagicNumber = 0.55228475f;    public ShapeLoadingView(Context context) {        super(context);        init();    }    public ShapeLoadingView(Context context, AttributeSet attrs) {        super(context, attrs);        init();    }    public ShapeLoadingView(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);    }    @TargetApi(Build.VERSION_CODES.LOLLIPOP)    public ShapeLoadingView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {        super(context, attrs, defStyleAttr, defStyleRes);        init();    }    private void init() {        mPaint = new Paint();        mPaint.setColor(getResources().getColor(R.color.triangle));        mPaint.setAntiAlias(true);        //看到网上说这个FILL_AND_STROKE有去锯齿的作用        mPaint.setStyle(Paint.Style.FILL_AND_STROKE);        setBackgroundColor(getResources().getColor(R.color.view_bg));    }    public boolean mIsLoading = false;    private Paint mPaint;    private float mControlX = 0;    private float mControlY = 0;    private float mAnimPercent;    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        //绘制三个图形的三角形方框圆形的位置，作者在这里标记动画可以优化，估计会有后续修改        if(getVisibility()==GONE){            return;        }        // FIXME: 15/6/15 动画待优化        switch (mShape) {            case SHAPE_TRIANGLE:                if (mIsLoading) {                    mAnimPercent += 0.1611113;                    // triangle to circle                    Path path = new Path();                    path.moveTo(relativeXFromView(0.5f), relativeYFromView(0f));                    if (mAnimPercent >= 1) {                        mShape = Shape.SHAPE_CIRCLE;                        mIsLoading = false;                        mAnimPercent=1;                    }                    float controlX = mControlX - relativeXFromView(mAnimPercent* mTriangle2Circle)                            * genhao3;                    float controlY = mControlY - relativeYFromView(mAnimPercent* mTriangle2Circle);                    path.quadTo(relativeXFromView(1) - controlX, controlY, relativeXFromView(0.5f + genhao3 / 4), relativeYFromView(0.75f));                    path.quadTo(relativeXFromView(0.5f), relativeYFromView(0.75f + 2 * mAnimPercent* mTriangle2Circle), relativeXFromView(0.5f - genhao3 / 4), relativeYFromView(0.75f));                    path.quadTo(controlX, controlY, relativeXFromView(0.5f), relativeYFromView(0f));                    path.close();                    canvas.drawPath(path, mPaint);                    invalidate();                } else {                    Path path = new Path();                    mPaint.setColor(getResources().getColor(R.color.triangle));                    path.moveTo(relativeXFromView(0.5f), relativeYFromView(0f));                    path.lineTo(relativeXFromView(1), relativeYFromView(genhao3 / 2f));                    path.lineTo(relativeXFromView(0), relativeYFromView(genhao3/2f));                    mControlX = relativeXFromView(0.5f - genhao3 / 8.0f);                    mControlY = relativeYFromView(3 / 8.0f);                    mAnimPercent = 0;                    path.close();                    canvas.drawPath(path, mPaint);                }                break;            case SHAPE_CIRCLE:                if (mIsLoading) {                    float magicNumber = mMagicNumber + mAnimPercent;                    mAnimPercent += 0.12;                    if (magicNumber + mAnimPercent >= 1.9f) {                        mShape = Shape.SHAPE_RECT;                        mIsLoading = false;                    }                    Path path = new Path();                    path.moveTo(relativeXFromView(0.5f), relativeYFromView(0f));                    path.cubicTo(relativeXFromView(0.5f + magicNumber / 2), relativeYFromView(0f),                            relativeXFromView(1), relativeYFromView(0.5f - magicNumber / 2),                            relativeXFromView(1f), relativeYFromView(0.5f));                    path.cubicTo(                            relativeXFromView(1), relativeXFromView(0.5f + magicNumber / 2),                            relativeXFromView(0.5f + magicNumber / 2), relativeYFromView(1f),                            relativeXFromView(0.5f), relativeYFromView(1f));                    path.cubicTo(relativeXFromView(0.5f - magicNumber / 2), relativeXFromView(1f),                            relativeXFromView(0), relativeYFromView(0.5f + magicNumber / 2),                            relativeXFromView(0f), relativeYFromView(0.5f));                    path.cubicTo(relativeXFromView(0f), relativeXFromView(0.5f - magicNumber / 2),                            relativeXFromView(0.5f - magicNumber / 2), relativeYFromView(0),                            relativeXFromView(0.5f), relativeYFromView(0f));                    path.close();                    canvas.drawPath(path, mPaint);                    invalidate();                } else {      mPaint.setColor(getResources().getColor(R.color.circle));                    Path path = new Path();                    float magicNumber = mMagicNumber;                    path.moveTo(relativeXFromView(0.5f), relativeYFromView(0f));                    path.cubicTo(relativeXFromView(0.5f + magicNumber / 2), 0,                            relativeXFromView(1), relativeYFromView(magicNumber / 2),                            relativeXFromView(1f), relativeYFromView(0.5f));                    path.cubicTo(                            relativeXFromView(1), relativeXFromView(0.5f + magicNumber / 2),                            relativeXFromView(0.5f + magicNumber / 2), relativeYFromView(1f),                            relativeXFromView(0.5f), relativeYFromView(1f));                    path.cubicTo(relativeXFromView(0.5f - magicNumber / 2), relativeXFromView(1f),                            relativeXFromView(0), relativeYFromView(0.5f + magicNumber / 2),                            relativeXFromView(0f), relativeYFromView(0.5f));                    path.cubicTo(relativeXFromView(0f), relativeXFromView(0.5f - magicNumber / 2),                            relativeXFromView(0.5f - magicNumber / 2), relativeYFromView(0),                            relativeXFromView(0.5f), relativeYFromView(0f));                    mAnimPercent = 0;                    path.close();                    canvas.drawPath(path, mPaint);                }                break;            case SHAPE_RECT:                if (mIsLoading) {                    mAnimPercent += 0.15;                    if (mAnimPercent >= 1) {                        mShape = Shape.SHAPE_TRIANGLE;                        mIsLoading = false;                        mAnimPercent = 1;                    }                    Path path = new Path();                    path.moveTo(relativeXFromView(0.5f * mAnimPercent), 0);                    path.lineTo(relativeYFromView(1 - 0.5f * mAnimPercent), 0);                    float distanceX = (mControlX) * mAnimPercent;                    float distanceY = (relativeYFromView(1f) - mControlY) * mAnimPercent;                    path.lineTo(relativeXFromView(1f) - distanceX, relativeYFromView(1f) - distanceY);                    path.lineTo(relativeXFromView(0f) + distanceX, relativeYFromView(1f) - distanceY);                    path.close();                    canvas.drawPath(path, mPaint);                    invalidate();                } else {                    mPaint.setColor(getResources().getColor(R.color.rect));                    mControlX = relativeXFromView(0.5f - genhao3 / 4);                    mControlY = relativeYFromView(0.75f);                    Path path = new Path();                    path.moveTo(relativeXFromView(0f), relativeYFromView(0f));                    path.lineTo(relativeXFromView(1f), relativeYFromView(0f));                    path.lineTo(relativeXFromView(1f), relativeYFromView(1f));                    path.lineTo(relativeXFromView(0f), relativeYFromView(1f));                    path.close();                    mAnimPercent = 0;                    canvas.drawPath(path, mPaint);                }                break;        }    }    private float relativeXFromView(float percent) {        return getWidth() * percent;    }    private float relativeYFromView(float percent) {        return getHeight() * percent;    }    public void changeShape() {        mIsLoading = true;        invalidate();    public enum Shape {        SHAPE_TRIANGLE, SHAPE_RECT, SHAPE_CIRCLE    }    @Override    public void setVisibility(int visibility) {        super.setVisibility(visibility);        if(visibility==VISIBLE){            invalidate();        }    }    public Shape getShape() {        return mShape;    }}

这个开源项目我们学习的两个主要知识
1.使用path绘制图形
2.ObjectAnimation&AnimatorSet
看了这个项目是不是可以用这两个知识点做一个自己喜欢的动画？
just do it.

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