2023學(xué)年完整公開課版補(bǔ)間動(dòng)畫Alpha

《通信業(yè)務(wù)開發(fā)》課程補(bǔ)間動(dòng)畫-Alpha補(bǔ)間動(dòng)畫-AlphaPART22-5動(dòng)畫原理相關(guān)類XML配置屬性實(shí)例演示動(dòng)畫原理示例漸變動(dòng)畫：根據(jù)起始/終止透明度，計(jì)算并漸變編碼實(shí)現(xiàn)AlphaAnimation<AnimationSet>AccelerateInterpolatorXML配置/res/anim<alpha><set

startOffset>

動(dòng)畫集時(shí)間偏移<interpolator>加速器AnimationUtils.loadAnimationstartAnimation實(shí)現(xiàn)No.屬性描述1android:fromAlpha

動(dòng)畫開始的透明度從0.0--1.00.0完全透明1.0完全不透明2android:toAlpha

動(dòng)畫結(jié)束時(shí)的透明度從0.0--1.00.0完全透明1.0完全不透明相關(guān)類與屬性AlphaAnimation1No.方法名稱類型描述1publicAnimationSet(booleanshareInterpolator)構(gòu)造true，使用Set的Interpolatorfalse，使用動(dòng)畫的Interpolator2publicvoidaddAnimation(Animationa)普通增加一個(gè)Animation組件3publicList<Animation>getAnimations()普通取得所有的Animation組件4publiclonggetDuration()普通取得動(dòng)畫的持續(xù)時(shí)間5publiclonggetStartTime()普通取得動(dòng)畫的開始時(shí)間6publicvoidreset()普通重置動(dòng)畫7publicvoidsetDuration(longdurationMillis)普通設(shè)置動(dòng)畫的持續(xù)時(shí)間8publicvoidsetStartTime(longstartTimeMillis)普通設(shè)置動(dòng)畫的開始時(shí)間相關(guān)類與屬性AnimationSet2No.子類描述1AccelerateDecelerateInterpolator加速-減速，動(dòng)畫在開始與結(jié)束的地方執(zhí)行速度慢，而中間部分時(shí)加速2AccelerateInterpolator加速，動(dòng)畫在開始的時(shí)候執(zhí)行速度慢，然后開始加速3DecelerateInterpolator減速，動(dòng)畫在開始的時(shí)候執(zhí)行速度塊，然后開始減速4CycleInterpolator動(dòng)畫循環(huán)播放特定的次數(shù)，速率改變沿著正弦曲線變化5LinearInterpolator動(dòng)畫以勻速的方式運(yùn)行相關(guān)類與屬性Interpolator子類

3相關(guān)類與屬性AnimationListener4No.方法描述1publicabstractvoidonAnimationStart(Animationanimation)動(dòng)畫開始時(shí)觸發(fā)2publicabstractvoidonAnimationRepeat(Animationanimation)動(dòng)畫重復(fù)時(shí)觸發(fā)3publicabstractvoidonAnimationEnd(Animationanimation)

動(dòng)畫結(jié)束時(shí)觸發(fā)No.可配置的元素描述1<set>為根節(jié)點(diǎn)，定義全部的動(dòng)畫元素2<alpha>定義漸變動(dòng)畫效果3<scale>定義縮放動(dòng)畫效果4<translate>定義平移動(dòng)畫效果5<rotate>定義旋轉(zhuǎn)動(dòng)畫效果XML配置屬性標(biāo)簽1No.可配置的屬性數(shù)據(jù)類型描述1android:durationlong動(dòng)畫持續(xù)時(shí)間，毫秒單位2android:fillAfterboolean動(dòng)畫轉(zhuǎn)化是否在動(dòng)畫結(jié)束后被應(yīng)用3android:fillBeforeboolean動(dòng)畫轉(zhuǎn)化是否在動(dòng)畫開始前被應(yīng)用4android:interpolatorString動(dòng)畫加速器：accelerate_decelerate_interpolator（加速-減速）accelerate_interpolator（加速）decelerate_interpolator（減速）5android:repeatCountint動(dòng)畫重復(fù)執(zhí)行的次數(shù)6android:repeatModeString動(dòng)畫重復(fù)的模式（restart、reverse）7android:startOffsetlong動(dòng)畫之間的間隔8android:zAdjustmentint動(dòng)畫ZOrder配置：0（保持不變）1（保持最上層）-1（保持最下層）9android:interpolatorString指定動(dòng)畫的執(zhí)行速率通用配置屬性2XML配置屬性實(shí)例演示publicclassFrameAnimationAcextendsActivity{Buttonbutton=null;ImageViewimgView=null;@OverridepublicvoidonCreate(BundlesavedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.frame);imgView=(ImageView)findViewById(R.id.imageView);button=(Button)findViewById(R.id.button1);button.setOnClickListener(newOnClickListener(){@OverridepublicvoidonClick(Viewv){AnimationSetset=newAnimationSet(true);

AlphaAnimationalpha=newAlphaAnimation(1,0.1f);set.setInterpolator(newAccelerateInterpolator());

set.addAnimation(alpha);

set.setDuration(3000);imgView.startAnimation(set);}});

}AnimationSet構(gòu)造AnimationSet中可添加多個(gè)動(dòng)畫效果對(duì)象，構(gòu)造復(fù)雜動(dòng)畫效果編碼實(shí)現(xiàn)1<?xml

version="1.0"

encoding="utf-8"?><set

xmlns:android="/apk/res/android"> <alpha

xmlns:android="/apk/res/android"

android:fromAlpha="1.0"

android:toAlpha="0.1"

android:duration="3000"

android:fillBefore="true">

</alpha></set>XML配置動(dòng)畫序列res/anim/alpha.xml實(shí)例演示XML配置2可將多個(gè)動(dòng)畫效果標(biāo)簽進(jìn)行組合，構(gòu)造復(fù)雜動(dòng)畫實(shí)例演示publicclassFrameAnimationAcextendsActivity{Buttonbutton=null;ImageViewimgView=null;@OverridepublicvoidonCreate(BundlesavedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.frame);imgView=(ImageView)findViewById(R.id.imageView);button=(Button)findViewById(R.id.button1);button.setOnClickListener(newOnClickListener(){@Override