我想出来的新LayoutTransition
类蜂巢之前的延迟。我已经设置了一个动画,将其添加到ViewGroup
时,可以将View
滑动到位。我注意到,当视图首次渲染和动画开始时,会有一些延迟(大约20ms)。换句话说,在视图出现在屏幕上之后,它暂时挂在空中,然后开始动画到位。您甚至可以在ApiDemos
示例项目中注意到这一点。在布局动画示例中,在ViewGroup
的APPEARING动画开始之前始终存在延迟。我甚至尝试将其他LayoutTransition
动画设置为null,或者最终给予它们非常短的时间,但动画仍然延迟了APPEARING
。这里是我的代码:如何消除一个LayoutTransition动画
public class DebugExampleFour extends Activity {
private int numButtons = 1;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.debug_example_four);
final ViewGroup frame = (ViewGroup) findViewById(R.id.frame_container);
LayoutTransition transitioner = new LayoutTransition();
Animator appearingAnimation = ObjectAnimator.ofFloat(null, "translationX", 600, 0);
appearingAnimation.setDuration(45);
appearingAnimation.setStartDelay(0);
appearingAnimation.setInterpolator(new DecelerateInterpolator());
appearingAnimation.addListener(new AnimatorListenerAdapter() {
public void onAnimationEnd(Animator anim) {
View view = (View) ((ObjectAnimator) anim).getTarget();
view.setTranslationX(0f);
}
});
transitioner.setAnimator(LayoutTransition.APPEARING, appearingAnimation);
Animator dummyAnimation = ObjectAnimator.ofInt(0, 1);
dummyAnimation.setDuration(1);
dummyAnimation.setStartDelay(0);
transitioner.setAnimator(LayoutTransition.CHANGE_APPEARING, dummyAnimation);
transitioner.setAnimator(LayoutTransition.CHANGE_DISAPPEARING, dummyAnimation);
transitioner.setAnimator(LayoutTransition.DISAPPEARING, dummyAnimation);
frame.setLayoutTransition(transitioner);
Button addButton = (Button) findViewById(R.id.addNewButton);
addButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Button newButton = new Button(DebugExampleFour.this);
newButton.setText("Click To Remove " + (numButtons++));
newButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
frame.removeView(v);
}
});
frame.addView(newButton, new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
}
});
}
}
下面是与例如伴随而来的布局文件:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="match_parent"
android:orientation="vertical">
<Button android:layout_width="wrap_content"
android:layout_height="wrap_content" android:text="Add Button"
android:id="@+id/addNewButton" />
<LinearLayout android:orientation="vertical"
android:layout_width="match_parent" android:layout_height="match_parent"
android:id="@+id/frame_container" android:animateLayoutChanges="true" />
</LinearLayout>
如何消除APPEARING
动画之前的延迟?
感谢您澄清@Chet,我认为看到JavaDoc或官方开发人员博客上发布的这些隐式延迟会很有用。 – 2011-04-05 05:23:33
好主意 - 我会添加一些到LayoutTransition javadocs来讨论默认行为/延迟。 – 2011-04-05 14:14:53
.....切特刚刚触摸我的数码... – dell116 2016-07-29 04:36:17