Android控件显示、隐藏时，增加动画效果(1)，深入理解Flutter动画原理

MainActivity.java

package com.llw.animationdemo;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;

import android.view.View;

import android.view.animation.AlphaAnimation;

import android.view.animation.Animation;

import android.view.animation.AnimationUtils;

import android.view.animation.ScaleAnimation;

import android.view.animation.TranslateAnimation;

import android.widget.Button;

import android.widget.ImageView;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

private ImageView ivLogo, ivAlphaLogo, ivTranslateLogo, ivScaleLogo;

private Button btnShow, btnHide, btnAlphaShow, btnAlphaHide, btnTranslateShow,

btnTranslateHide, btnScaleShow, btnScaleHide;

private AlphaAnimation alphaAniShow, alphaAniHide;

private TranslateAnimation translateAniShow, translateAniHide;

private Animation bigAnimation, smallAnimation;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

initView();

}

//初始化控件

private void initView() {

ivLogo = (ImageView) findViewById(R.id.iv_logo);

ivAlphaLogo = (ImageView) findViewById(R.id.iv_alpha_logo);

ivTranslateLogo = (ImageView) findViewById(R.id.iv_translate_logo);

ivScaleLogo = (ImageView) findViewById(R.id.iv_scale_logo);

btnShow = (Button) findViewById(R.id.btn_show);

btnHide = (Button) findViewById(R.id.btn_hide);

btnAlphaShow = (Button) findViewById(R.id.btn_alpha_show);

btnAlphaHide = (Button) findViewById(R.id.btn_alpha_hide);

btnTranslateShow = (Button) findViewById(R.id.btn_translate_show);

btnTranslateHide = (Button) findViewById(R.id.btn_translate_hide);

btnScaleShow = (Button) findViewById(R.id.bt