android – 如何制作像whatsapp调用屏幕的动画？
作者：互联网
我正在尝试在WhatsApp Call屏幕中编写动画.但我不知道实现这一目标的真正方法是什么.
为了实现这个动画,我开始尝试使用fadein和fadeout动画.这些是我设置淡入淡出动画的方法.
private Animation setAnimFadeOut(int startOff,int duration){
Animation animFadeOut;
animFadeOut = new AlphaAnimation(1, 0);
animFadeOut.setInterpolator(new AccelerateInterpolator());
animFadeOut.setStartOffset(startOff);
animFadeOut.setDuration(duration);
return animFadeOut;
}
private Animation setAnimFadeIn(int startOff,int duration){
Animation animFadeIn;
animFadeIn = new AlphaAnimation(0, 1);
animFadeIn.setInterpolator(new AccelerateInterpolator());
animFadeIn.setStartOffset(startOff);
animFadeIn.setDuration(duration);
return animFadeIn;
}
对于每个动画,animationlisteners onAnimationEnd方法触发动画重启. fadeIn动画启动fadeOut动画,fadeOut启动fadeIn动画.
right1FadeOut.setAnimationListener(new Animation.AnimationListener() {
@Override
public void onAnimationEnd(Animation animation) {
right1.startAnimation(right1FadeIn);
Log.i(TAG, "onAnimationEnd: 1 outEnd");
}
});
right1FadeIn.setAnimationListener(new Animation.AnimationListener() {
Override
public void onAnimationEnd(Animation animation) {
right1.startAnimation(right1FadeOut);
Log.i(TAG, "onAnimationEnd: 1 inEnd");
}
});
初始化
int startOff = 0;
int diff = 100;
int duration = 600;
final Animation right1FadeOut = setAnimFadeOut(startOff,duration);
final Animation right1FadeIn = setAnimFadeIn(0,duration);
final Animation right2FadeOut = setAnimFadeOut(startOff+diff,duration+diff);
final Animation right2FadeIn = setAnimFadeIn(0,duration);
final Animation right3FadeOut = setAnimFadeOut(startOff+diff*2,duration+diff*2);
final Animation right3FadeIn = setAnimFadeIn(0,duration);
我正在为每个按钮开始调用fadeout的动画,它没有像我预期的那样工作.我怎样才能实现像WhatsApp这样的动画？
right1.startAnimation(right1FadeOut);
right2.startAnimation(right2FadeOut);
right3.startAnimation(right3FadeOut);
结果就是这样.
解决方法:
我首先使用Animator对象而不是动画,然后我可以使用AnimatorSet来控制所有动画师作为一个组. (又名：订单)
例如：
活动XML：
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="@+id/txt"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:clickable="true"
android:focusable="true"
android:text="Hello World!"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical">
<ImageView
android:id="@+id/img1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:alpha="0"
android:src="@drawable/ic_launcher_foreground" />
<ImageView
android:id="@+id/img2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:alpha="0"
android:src="@drawable/ic_launcher_foreground" />
<ImageView
android:id="@+id/img3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:alpha="0"
android:src="@drawable/ic_launcher_foreground" />
<ImageView
android:id="@+id/img4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:alpha="0"
android:src="@drawable/ic_launcher_foreground" />
</LinearLayout>
</android.support.constraint.ConstraintLayout>
活动类：
Java的：
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
View[] images = {findViewById(R.id.img1), findViewById(R.id.img2), findViewById(R.id.img3), findViewById(R.id.img4),}; //array of views that we want to animate
//we will have 2 animator foreach view, fade in & fade out
//prepare animators - creating array of animators & instantiating Object animators
ArrayList<ObjectAnimator> anims = new ArrayList<>(images.length * 2);
for (View v : images) anims.add(ObjectAnimator.ofFloat(v, View.ALPHA, 0f, 1f).setDuration(80)); //fade in animator
for (View v : images) anims.add(ObjectAnimator.ofFloat(v, View.ALPHA, 1f, 0f).setDuration(80)); //fade out animator
final AnimatorSet set = new AnimatorSet(); //create Animator set object
//if we want to repeat the animations then we set listener to start again in 'onAnimationEnd' method
set.addListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
set.start(); //repeat animator set indefinitely
}
});
set.setStartDelay(600); //set delay every time we start the chain of animations
for (int i = 0; i < anims.size() - 1; i++) set.play(anims.get(i)).before(anims.get(i + 1)); //put all animations in set by order (from first to last)
findViewById(R.id.txt).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) { //start the animations on click
set.start();
}
});
}
}
科特林：
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
val images = arrayOf(img1, img2, img3, img4) //array of views that we want to animate
//we will have 2 animator foreach view, fade in & fade out
//prepare animators - creating array of animators & instantiating Object animators
val anims = ArrayList<ObjectAnimator>(images.size * 2)
for (v in images) anims.add(ObjectAnimator.ofFloat(v, View.ALPHA, 0f, 1f).setDuration(80)) //fade in animator
for (v in images) anims.add(ObjectAnimator.ofFloat(v, View.ALPHA, 1f, 0f).setDuration(80)) //fade out animator
val set = AnimatorSet() //create Animator set object
//if we want to repeat the animations then we set listener to start again in 'onAnimationEnd' method
set.addListener(object : AnimatorListenerAdapter() {
override fun onAnimationEnd(animation: Animator?) = set.start() //repeat animator set indefinitely
})
set.startDelay = 600 //set delay every time we start the chain of animations
for (i in 0 until anims.size - 1) set.play(anims[i]).before(anims[i + 1]) //put all animations in set by order (from first to last)
txt.setOnClickListener { set.start() } //start the animations on click
}
}
标签：android,animation,fadein,fadeout 来源： https://codeday.me/bug/20190701/1347099.html