1
我有一個在協調器佈局內有5個標籤的佈局。android:僅在第一個標籤上顯示晶圓廠圖標
我想僅在第一個選項卡上顯示晶圓廠圖標並隱藏其餘的圖標。
我想這和它的工作:
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) {
}
});
問題我也想爲FAB按鈕hide on scrolling
效果。
所以我創建延伸FloatingActionButton.Behavior一個ScrollAwareFABBehavior類和CoordinatorLayout行爲相關聯的浮動操作按鈕
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();
}
}
}
而且通過
<android.support.design.widget.FloatingActionButton
.
.
app:layout_behavior="com.simha.yatras.ScrollAwareFABBehavior"/>
實現,如果我從有到任何標籤第一個標籤,圖標消失。 (這是我想要的)。但如果我滾動,在該選項卡內,如果我在頂部並且在到達底部時消失,則圖標可見。
它出現在所有的選項卡中。
ScrollAwareFABBehavior正在所有選項卡上執行操作。如何限制它僅在第一個選項卡上執行操作。