android 高度动画,android
android-如何使用动画扩展布局高度？
对于如何执行此操作，我找不到很好的例子。
我有一个x高度设置的RelativeLayout。
我想添加一个将高度扩展到x + y高度的按钮。
有人可以向我推荐一个有关如何以编程方式进行操作的好例子吗？
5个解决方案
65 votes
您标记了最接近的解决方案。 这是确切的解决方案。 我有同样的问题。 希望这个答案可以帮助其他人。
实例化ResizeAnimation
ResizeAnimation resizeAnimation = new ResizeAnimation(
view,
targetHeight,
startHeight
);
resizeAnimation.setDuration(duration);
view.startAnimation(resizeAnimation);
ResizeAnimation类应该看起来像这样
public class ResizeAnimation extends Animation {
final int targetHeight;
View view;
int startHeight;
public ResizeAnimation(View view, int targetHeight, int startHeight) {
this.view = view;
this.targetHeight = targetHeight;
this.startHeight = startHeight;
}
@Override
protected void applyTransformation(float interpolatedTime, Transformation t) {
int newHeight = (int) (startHeight + targetHeight * interpolatedTime);
//to support decent animation, change new heigt as Nico S. recommended in comments
//int newHeight = (int) (startHeight+(targetHeight - startHeight) * interpolatedTime);
view.getLayoutParams().height = newHeight;
view.requestLayout();
}
@Override
public void initialize(int width, int height, int parentWidth, int parentHeight) {
super.initialize(width, height, parentWidth, parentHeight);
}
@Override
public boolean willChangeBounds() {
return true;
}
}
the_prole answered 2020-07-26T03:05:49Z
18 votes
您需要缩放动画，这是官方文档
这是在代码中
private void animate() {
ImageView imageView = (ImageView) findViewById(R.id.ImageView01);
ScaleAnimation scale = new ScaleAnimation((float)1.0, (float)1.5, (float)1.0, (float)1.5);
scale.setFillAfter(true);
scale.setDuration(500);
imageView.startAnimation(scale);
}
Lukap answered 2020-07-26T03:06:14Z
16 votes
请检查以下新编辑的答案，如下所示。 但是在这里，您需要知道确切的新高度。
public class LayoutAnimationActivity extends Activity {
RelativeLayout ril1;
Button btn;
int initialHeight;
int actualHeight;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main2);
ril1 = (RelativeLayout) findViewById(R.id.relativeLayout1);
btn = new Button(this);
btn.setWidth(100);
btn.setHeight(200);
btn.setText("Button");
actualHeight = 210;
Ani a = new Ani();
a.setDuration(2000);
ril1.startAnimation(a);
}
class Ani extends Animation {
public Ani() {}
@Override
protected void applyTransformation(float interpolatedTime, Transformation t) {
int newHeight;
newHeight = (int) (initialHeight * interpolatedTime);
ril1.removeAllViews();
btn.setWidth(100);
btn.setHeight(300);
btn.setText("as");
ril1.addView(btn);
ril1.getLayoutParams().height = newHeight;
ril1.requestLayout();
}
@Override
public void initialize(int width, int height, int parentWidth, int parentHeight) {
super.initialize(width, height, parentWidth, parentHeight);
initialHeight = actualHeight;
}
@Override
public boolean willChangeBounds() {
return true;
}
};
}
Maneesh answered 2020-07-26T03:05:21Z
4 votes
没有Animation类的两种简单方法：
1)在您的xml布局文件中设置android:animateLayoutChanges="true"
2)使用ViewProperty动画师
layout.setPivot(0);
layout.animate().scaleY(scaleFactor).setDuration(500);
枢轴告诉视图从何处缩放，默认在中间，根据我的经验，这几乎从来都不是您想要的。 持续时间是可选的(默认= 1000)。
GLee answered 2020-07-26T03:06:47Z
2 votes
final Button button1 = (Button) view.findViewById(R.id.button);
final CollapseAnimator animator = new CollapseAnimator(topLayout);
final ViewTreeObserver.OnGlobalLayoutListener listener = new ViewTreeObserver.OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
int mHeight = button1.getMeasuredHeight();
KLog.i("onGlobalLayout() mHeight:" + mHeight);
animator.setValues(mHeight*2, mHeight);
}
};
button1.getViewTreeObserver().addOnGlobalLayoutListener(listener);
button1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
view.post(new Runnable() {
@Override
public void run() {
button1.getViewTreeObserver().removeOnGlobalLayoutListener(listener);
animator.collapse();
}
});
}
});
和课
public class CollapseAnimator {
private View view;
private boolean collapse=true;
private int duation=300;
private int destHeight=300;
private ValueAnimator animator;
private int originHeight=0;
private int from=0;
private int to=0;
public CollapseAnimator(View view ) {
this.view = view;
}
public void setValues(int destHeight,int originHeight){
this.destHeight = destHeight;
this.originHeight=originHeight;
from=originHeight;
to=originHeight;
}
public void collapse(){
from=to;
if(collapse){
to=destHeight;
collapse=false;
}else{
to=originHeight;
collapse=true;
}
KLog.i("from:" + from+",to:"+to);
animator = ValueAnimator.ofInt(from, to);
animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator valueAnimator) {
int val = (Integer) valueAnimator.getAnimatedValue();
ViewGroup.LayoutParams layoutParams = view.getLayoutParams();
layoutParams.height = val;
view.setLayoutParams(layoutParams);
}
});
animator.setDuration(duation);
animator.start();
}
}
adsl99801 answered 2020-07-26T03:07:08Z