1
我有一个在协调器布局内有5个标签的布局。android:仅在第一个标签上显示晶圆厂图标
我想仅在第一个选项卡上显示晶圆厂图标并隐藏其余的图标。
我想这和它的工作:
viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
@Override
public void onPageSelected(int position) {
switch (position) {
case 0:
fab.show();
break;
default:
fab.hide();
break;
}
}
@Override
public void onPageScrollStateChanged(int state) {
}
});
问题我也想为FAB按钮hide on scrolling
效果。
所以我创建延伸FloatingActionButton.Behavior一个ScrollAwareFABBehavior类和CoordinatorLayout行为相关联的浮动操作按钮
package com.simha.yatras;
import android.content.Context;
import android.support.design.widget.CoordinatorLayout;
import android.support.design.widget.FloatingActionButton;
import android.support.v4.view.ViewCompat;
import android.util.AttributeSet;
import android.view.View;
public class ScrollAwareFABBehavior extends FloatingActionButton.Behavior {
public ScrollAwareFABBehavior(Context context, AttributeSet attrs) {
super();
}
@Override
public boolean onStartNestedScroll(final CoordinatorLayout coordinatorLayout, final FloatingActionButton child,
final View directTargetChild, final View target, final int nestedScrollAxes) {
// Ensure we react to vertical scrolling
return nestedScrollAxes == ViewCompat.SCROLL_AXIS_VERTICAL
|| super.onStartNestedScroll(coordinatorLayout, child, directTargetChild, target, nestedScrollAxes);
}
@Override
public void onNestedScroll(final CoordinatorLayout coordinatorLayout, final FloatingActionButton child,
final View target, final int dxConsumed, final int dyConsumed,
final int dxUnconsumed, final int dyUnconsumed) {
super.onNestedScroll(coordinatorLayout, child, target, dxConsumed, dyConsumed, dxUnconsumed, dyUnconsumed);
if (dyConsumed > 0 && child.getVisibility() == View.VISIBLE) {
// User scrolled down and the FAB is currently visible -> hide the FAB
child.hide();
} else if (dyConsumed < 0 && child.getVisibility() != View.VISIBLE) {
// User scrolled up and the FAB is currently not visible -> show the FAB
child.show();
}
}
}
而且通过
<android.support.design.widget.FloatingActionButton
.
.
app:layout_behavior="com.simha.yatras.ScrollAwareFABBehavior"/>
实现,如果我从有到任何标签第一个标签,图标消失。 (这是我想要的)。但如果我滚动,在该选项卡内,如果我在顶部并且在到达底部时消失,则图标可见。
它出现在所有的选项卡中。
ScrollAwareFABBehavior正在所有选项卡上执行操作。如何限制它仅在第一个选项卡上执行操作。