自定义控件之58同城加载

分析：这是一个组合控件加上属性动画来实现，布局是一个线性布局，一个变化的控件ShapeView，圆形，正方形，三角形不断变换，底部还有一个阴影，先下落动画和缩放，接着上抛和缩放动画并旋转，通过动画监听来控制旋转动画。效果如下图所示

<?xml version="1.0" encoding="utf-8"?>
<LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"xmlns:app="http://schemas.android.com/apk/res-auto"android:layout_width="match_parent"android:orientation="vertical"android:background="#FFFFFF"android:gravity="center"android:layout_height="match_parent"><com.cmj.myview.view.ShapeViewandroid:id="@+id/shape_view"android:layout_width="25dp"android:layout_marginBottom="82dp"android:layout_height="25dp" /><Viewandroid:id="@+id/shadow_view"android:background="@drawable/loading_shadow_bg"android:layout_width="25dp"android:layout_height="3dp"/><TextViewandroid:layout_marginTop="5dp"android:layout_width="wrap_content"android:text="玩命记载中..."android:layout_height="wrap_content" /></LinearLayout>

阴影布局

<?xml version="1.0" encoding="utf-8"?>
<shapexmlns:android="http://schemas.android.com/apk/res/android"android:shape="oval"><solid android:color="#000000"/>
</shape>

/*** @author cmjsp1990@163.com* @date 2018/12/17* 先下落动画，同时缩放，接着上抛动画，同时旋转*/

public class ShapeView extends View {private Shape mCurrentShape = Shape.Circle;private Paint mPaint;private Path mPath;public ShapeView(Context context) {this(context, null);}public ShapeView(Context context, @Nullable AttributeSet attrs) {this(context, attrs, 0);}public ShapeView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr);mPaint = new Paint();mPaint.setAntiAlias(true);}@Overrideprotected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {super.onMeasure(widthMeasureSpec, heightMeasureSpec);//只保证正方形int width = MeasureSpec.getSize(widthMeasureSpec);int height = MeasureSpec.getSize(heightMeasureSpec);setMeasuredDimension(Math.min(width, height), Math.min(width, height));}@Overrideprotected void onDraw(Canvas canvas) {super.onDraw(canvas);switch (mCurrentShape) {case Circle://画圆形int center = getWidth() / 2;mPaint.setColor(ContextCompat.getColor(getContext(), R.color.circle));canvas.drawCircle(center,center,center,mPaint);break;case Square://画正方形mPaint.setColor(ContextCompat.getColor(getContext(),R.color.rect));canvas.drawRect(0,0,getWidth(),getHeight(),mPaint);break;case Triangle://三角mPaint.setColor(ContextCompat.getColor(getContext(),R.color.triangle));if (mPath==null){mPath = new Path();mPath.moveTo(getWidth() / 2, 0);mPath.lineTo(0, (float) ((getWidth()/2)*Math.sqrt(3)));mPath.lineTo(getWidth(), (float) ((getWidth()/2)*Math.sqrt(3)));// path.lineTo(getWidth()/2,0);mPath.close();// 把路径闭合}canvas.drawPath(mPath,mPaint);break;}}public Shape getCurrentShape() {return mCurrentShape;}/*** 改变形状*/public void exchange() {switch (mCurrentShape) {case Circle://画圆形mCurrentShape=Shape.Square;break;case Square:mCurrentShape=Shape.Triangle;break;case Triangle:mCurrentShape=Shape.Circle;break;}invalidate();}public enum Shape {Circle, Square, Triangle}
}

public class LoadingView extends LinearLayout {private final ShapeView mShapeView;private final View mShadowView;private int mTranslationDistance = 0;// 动画执行的时间private final long ANIMATOR_DURATION = 300;// 是否停止动画private boolean mIsStopAnimator = false;public LoadingView(Context context) {this(context, null);}public LoadingView(Context context, @Nullable AttributeSet attrs) {this(context, attrs, 0);}public LoadingView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr);inflate(context, R.layout.ui_loading_view, this);mShapeView = (ShapeView) findViewById(R.id.shape_view);mShadowView = findViewById(R.id.shadow_view);mTranslationDistance = dip2px(80);post(new Runnable() {@Overridepublic void run() {startFallAnimator();}});}/*** 开始下落动画*/private void startFallAnimator() {if (mIsStopAnimator){return;}//下落位移动画ObjectAnimator translationY = ObjectAnimator.ofFloat(mShapeView, "translationY", 0, mTranslationDistance);//配合中间阴影缩小ObjectAnimator scaleX = ObjectAnimator.ofFloat(mShapeView, "scaleX", 1f, 0.3f);//组合动画AnimatorSet animatorSet = new AnimatorSet();animatorSet.setDuration(ANIMATOR_DURATION);//加速差值器animatorSet.setInterpolator(new AccelerateInterpolator());animatorSet.playTogether(translationY, scaleX);animatorSet.start();animatorSet.addListener(new AnimatorListenerAdapter() {@Overridepublic void onAnimationEnd(Animator animation) {super.onAnimationEnd(animation);//改变形状mShapeView.exchange();//下落结束后就进行上抛动画startUpAnimator();}});}/*** 开始上抛动画*/private void startUpAnimator() {if (mIsStopAnimator){return;}ObjectAnimator translationY = ObjectAnimator.ofFloat(mShapeView, "translationY", mTranslationDistance, 0);ObjectAnimator scaleX = ObjectAnimator.ofFloat(mShapeView, "scaleX", 0.3f, 1f);AnimatorSet animatorSet = new AnimatorSet();animatorSet.setDuration(ANIMATOR_DURATION);//减速差值器animatorSet.setInterpolator(new DecelerateInterpolator());animatorSet.playTogether(translationY, scaleX);animatorSet.start();animatorSet.addListener(new AnimatorListenerAdapter() {@Overridepublic void onAnimationEnd(Animator animation) {//上抛结束就下落startFallAnimator();}@Overridepublic void onAnimationStart(Animator animation) {//开始旋转startRotateAnimator();}});}/*** 开始旋转动画*/private void startRotateAnimator() {ObjectAnimator rotationAnimator = null;switch (mShapeView.getCurrentShape()) {case Circle:case Square:rotationAnimator.ofFloat(mShapeView,"rotation",0,180);break;case Triangle:rotationAnimator.ofFloat(mShapeView,"rotation",0,-120);break;}rotationAnimator.setDuration(ANIMATOR_DURATION);rotationAnimator.setInterpolator(new DecelerateInterpolator());rotationAnimator.start();}@Overridepublic void setVisibility(int visibility) {super.setVisibility(View.INVISIBLE);//清理动画mShapeView.clearAnimation();mShadowView.clearAnimation();ViewGroup parent = (ViewGroup) getParent();if (parent!=null){parent.removeView(this);removeAllViews();}mIsStopAnimator=true;}private int dip2px(int dip) {return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dip, getResources().getDisplayMetrics());}
}

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