android 一个好看的翻转动画实现
16lz
2021-12-04
工具类
import android.graphics.Camera;import android.graphics.Matrix;import android.view.animation.Animation;import android.view.animation.Transformation;/** * A 3D Flip Card for Android */public class FlipCardAnimation extends Animation { private final float mFromDegrees; private final float mToDegrees; private final float mCenterX; private final float mCenterY; private Camera mCamera; //用于确定内容是否开始变化 private boolean isContentChange = false; private OnContentChangeListener listener; public FlipCardAnimation(float fromDegrees, float toDegrees, float centerX, float centerY) { mFromDegrees = fromDegrees; mToDegrees = toDegrees; mCenterX = centerX; mCenterY = centerY; } ////用于确定内容是否开始变化 在动画开始之前调用 public void setCanContentChange(){ this.isContentChange = false; } @Override public void initialize(int width, int height, int parentWidth, int parentHeight) { super.initialize(width, height, parentWidth, parentHeight); mCamera = new Camera(); } @Override protected void applyTransformation(float interpolatedTime, Transformation t) { final float fromDegrees = mFromDegrees; float degrees = fromDegrees + ((mToDegrees - fromDegrees) * interpolatedTime); final float centerX = mCenterX; final float centerY = mCenterY; final Camera camera = mCamera; final Matrix matrix = t.getMatrix(); camera.save(); if (degrees>90 || degrees<-90){ if (!isContentChange){ if(listener!=null){ listener.contentChange(); } isContentChange = true; } if (degrees>0) { degrees = 270 + degrees - 90; }else if (degrees<0){ degrees = -270+(degrees+90); } } camera.rotateX(degrees); camera.getMatrix(matrix); camera.restore(); matrix.preTranslate(-centerX, -centerY); matrix.postTranslate(centerX, centerY); } public void setOnContentChangeListener(OnContentChangeListener listener) { this.listener = listener; } public interface OnContentChangeListener{ void contentChange(); }}调用方法
private void startAnimation(FlipCardAnimation animation, View view) { if (animation != null) { animation.setCanContentChange(); view.startAnimation(animation); } else { int width = view.getWidth() / 2; int height = view.getHeight() / 2; animation = new FlipCardAnimation(0, 180, width, height); animation.setInterpolator(new AnticipateOvershootInterpolator()); animation.setDuration(3000); animation.setFillAfter(false);// animation.setRepeatCount(-1); //循环翻转 animation.setAnimationListener(new Animation.AnimationListener() { @Override public void onAnimationStart(Animation animation) { } @Override public void onAnimationEnd(Animation animation) { } @Override public void onAnimationRepeat(Animation animation) {// ((FlipCardAnimation)animation).setCanContentChange(); //循环翻转 } }); view.startAnimation(animation); } }第一个参数的工具类 第二个是view
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