我有一个线性布局,我想显示或隐藏与动画,推动布局向上或向下每当我改变其可见性。
我在那里看过一些样品,但没有一个适合我的需要。
我已经为动画创建了两个xml文件,但我不知道当我改变线性布局的可见性时如何启动它们。
我有一个线性布局,我想显示或隐藏与动画,推动布局向上或向下每当我改变其可见性。
我在那里看过一些样品,但没有一个适合我的需要。
我已经为动画创建了两个xml文件,但我不知道当我改变线性布局的可见性时如何启动它们。
当前回答
如果你想同时显示/隐藏多个视图,你可以使用TransitionSet(因为你不能同时播放2个“单个”过渡)
fun slideTopBottomVisibility(topLayout: View, bottomLayout: View, show: Boolean) {
val topTransition: Transition = Slide(Gravity.TOP)
topTransition.duration = 600
topTransition.addTarget(topLayout)
val bottomTransition: Transition = Slide(Gravity.BOTTOM)
bottomTransition.duration = 600
bottomTransition.addTarget(bottomLayout)
val transitionSet = TransitionSet()
transitionSet.addTransition(topTransition)
transitionSet.addTransition(bottomTransition)
TransitionManager.beginDelayedTransition(topLayout.parent as ViewGroup, transitionSet)
topLayout.visibility = if (show) View.VISIBLE else View.GONE
bottomLayout.visibility = if (show) View.VISIBLE else View.GONE
}
其他回答
我在理解和应用公认的答案时遇到了困难。我需要更多的背景知识。现在我已经搞清楚了,下面是一个完整的例子:
MainActivity.java
public class MainActivity extends AppCompatActivity {
Button myButton;
View myView;
boolean isUp;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
myView = findViewById(R.id.my_view);
myButton = findViewById(R.id.my_button);
// initialize as invisible (could also do in xml)
myView.setVisibility(View.INVISIBLE);
myButton.setText("Slide up");
isUp = false;
}
// slide the view from below itself to the current position
public void slideUp(View view){
view.setVisibility(View.VISIBLE);
TranslateAnimation animate = new TranslateAnimation(
0, // fromXDelta
0, // toXDelta
view.getHeight(), // fromYDelta
0); // toYDelta
animate.setDuration(500);
animate.setFillAfter(true);
view.startAnimation(animate);
}
// slide the view from its current position to below itself
public void slideDown(View view){
TranslateAnimation animate = new TranslateAnimation(
0, // fromXDelta
0, // toXDelta
0, // fromYDelta
view.getHeight()); // toYDelta
animate.setDuration(500);
animate.setFillAfter(true);
view.startAnimation(animate);
}
public void onSlideViewButtonClick(View view) {
if (isUp) {
slideDown(myView);
myButton.setText("Slide up");
} else {
slideUp(myView);
myButton.setText("Slide down");
}
isUp = !isUp;
}
}
activity_mail.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.slideview.MainActivity">
<Button
android:id="@+id/my_button"
android:layout_centerHorizontal="true"
android:layout_marginTop="100dp"
android:onClick="onSlideViewButtonClick"
android:layout_width="150dp"
android:layout_height="wrap_content"/>
<LinearLayout
android:id="@+id/my_view"
android:background="#a6e1aa"
android:orientation="vertical"
android:layout_alignParentBottom="true"
android:layout_width="match_parent"
android:layout_height="200dp">
</LinearLayout>
</RelativeLayout>
笔记
感谢这篇文章为我指明了正确的方向。它比本页上的其他答案更有帮助。 如果你想从屏幕上的视图开始,那么不要将它初始化为INVISIBLE。 因为我们是完全在屏幕外制作动画,所以没有必要将它设置为INVISIBLE。如果你的动画不是完全脱离屏幕,那么你可以添加一个alpha动画,并使用AnimatorListenerAdapter设置可见性。 动画文档
Suragch用科特林语回答。这对我很管用。
class MainActivity : AppCompatActivity() {
var isUp: Boolean = false
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
var myView: View = findViewById(R.id.my_view)
var myButton: Button = findViewById(R.id.my_button)
//Initialize as invisible
myView.visibility = View.INVISIBLE
myButton.setText("Slide up")
isUp = false
}
fun View.slideUp(duration: Int = 500){
visibility = View.VISIBLE
val animate = TranslateAnimation(0f, 0f, this.height.toFloat(), 0f)
animate.duration = duration.toLong()
animate.fillAfter = true
this.startAnimation(animate)
}
fun View.slideDown(duration: Int = 500) {
visibility = View.VISIBLE
val animate = TranslateAnimation(0f, 0f, 0f, this.height.toFloat())
animate.duration = duration.toLong()
animate.fillAfter = true
this.startAnimation(animate)
}
fun onSlideViewButtonClick(view: View){
if(isUp){
my_view.slideDown()
my_button.setText("Slide Up")
}
else{
my_view.slideUp()
my_button.setText("Slide Down")
}
isUp = !isUp
}
}
if (filter_section.getVisibility() == View.GONE) {
filter_section.animate()
.translationY(filter_section.getHeight()).alpha(1.0f)
.setListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationStart(Animator animation) {
super.onAnimationStart(animation);
filter_section.setVisibility(View.VISIBLE);
filter_section.setAlpha(0.0f);
}
});
} else {
filter_section.animate()
.translationY(0).alpha(0.0f)
.setListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
super.onAnimationEnd(animation);
filter_section.setVisibility(View.GONE);
}
});
}
最简单的解决方案:在持有视图的容器上设置android:animateLayoutChanges="true"。
如果你有一个如下所示的布局,这个容器中所有视图的可见性变化都将自动动画化。
<LinearLayout android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:animateLayoutChanges="true"
>
<Views_which_change_visibility>
</LinearLayout>
你可以在动画布局变化- Android开发者上找到更多细节
当LinearLayout的可见性改变时,你可以通过创建LinearLayout的一个新的子类并覆盖setVisibility()来启动动画来启动正确的动画。考虑一下这样的事情:
public class SimpleViewAnimator extends LinearLayout
{
private Animation inAnimation;
private Animation outAnimation;
public SimpleViewAnimator(Context context)
{
super(context);
}
public void setInAnimation(Animation inAnimation)
{
this.inAnimation = inAnimation;
}
public void setOutAnimation(Animation outAnimation)
{
this.outAnimation = outAnimation;
}
@Override
public void setVisibility(int visibility)
{
if (getVisibility() != visibility)
{
if (visibility == VISIBLE)
{
if (inAnimation != null) startAnimation(inAnimation);
}
else if ((visibility == INVISIBLE) || (visibility == GONE))
{
if (outAnimation != null) startAnimation(outAnimation);
}
}
super.setVisibility(visibility);
}
}