[英]How to hide or show the partially hidden toolbar/actionbar when you stop scrolling the listview/recyclerview in android
因此,在滾動時顯示和隱藏操作欄我使用協調器布局和appbarlayout使用此方法
但是,當我停止滾動工具欄中間的列表被隱藏或顯示時,它停留在那里,只有部分工具欄可見。
我想要做的是根據可見工具欄的百分比使工具欄完全顯示或隱藏。
有沒有辦法可以使用協調器布局和appbarlayout實現這一點?
編輯 - 只需獲得23.1.0設計庫並在ToolBar布局中添加“| snap”屬性:
<android.support.design.widget.CoordinatorLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_scrollFlags="scroll|enterAlways|snap />
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所以你不需要使用以下代碼:
您是否嘗試將layout_behaviour屬性添加到AppBarLayout?
app:layout_behavior="AppBarLayoutSnapBehavior"
然后你需要創建類“AppBarLayoutSnapBehavior”:
public class AppBarLayoutSnapBehavior extends AppBarLayout.Behavior {
private ValueAnimator mAnimator;
private boolean mNestedScrollStarted = false;
public AppBarLayoutSnapBehavior(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
public boolean onStartNestedScroll(CoordinatorLayout coordinatorLayout, AppBarLayout child,
View directTargetChild, View target, int nestedScrollAxes) {
mNestedScrollStarted = super.onStartNestedScroll(coordinatorLayout, child, directTargetChild, target, nestedScrollAxes);
if (mNestedScrollStarted && mAnimator != null) {
mAnimator.cancel();
}
return mNestedScrollStarted;
}
@Override
public void onStopNestedScroll(CoordinatorLayout coordinatorLayout, AppBarLayout child, View target) {
super.onStopNestedScroll(coordinatorLayout, child, target);
if (!mNestedScrollStarted) {
return;
}
mNestedScrollStarted = false;
int scrollRange = child.getTotalScrollRange();
int topOffset = getTopAndBottomOffset();
if (topOffset <= -scrollRange || topOffset >= 0) {
// Already fully visible or fully invisible
return;
}
if (topOffset < -(scrollRange / 2f)) {
// Snap up (to fully invisible)
animateOffsetTo(-scrollRange);
} else {
// Snap down (to fully visible)
animateOffsetTo(0);
}
}
private void animateOffsetTo(int offset) {
if (mAnimator == null) {
mAnimator = new ValueAnimator();
mAnimator.setInterpolator(new DecelerateInterpolator());
mAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
setTopAndBottomOffset((int) animation.getAnimatedValue());
}
});
} else {
mAnimator.cancel();
}
mAnimator.setIntValues(getTopAndBottomOffset(), offset);
mAnimator.start();
}
應該適合你。
我有部分解決方案。 在您的recyclerview中添加onScrollListener,在param中添加AppBarLayout
public class ImprovedScrollListener extends RecyclerView.OnScrollListener {
private WeakReference<AppBarLayout> mAppBarLayout;
public ImprovedScrollListener(AppBarLayout appBarLayout) {
mAppBarLayout = new WeakReference<>(appBarLayout);
}
@Override
public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
super.onScrollStateChanged(recyclerView, newState);
if (newState == RecyclerView.SCROLL_STATE_IDLE && mAppBarLayout.get() != null) {
if (!recyclerView.canScrollVertically(-1) && !recyclerView.canScrollVertically(1)) {
/// TODO: 21.10.2015 handle this state
}else if(!recyclerView.canScrollVertically(-1)){
mAppBarLayout.get().setExpanded(true, true);
} else {
mAppBarLayout.get().setExpanded(false, true);
}
}
}
}
這將適用於可以滾動的recyclerviews,當recyclerview不可滾動時,這仍然表現得很難看(參見代碼中的TODO)。 如果有人為此案找到解決方案,請告訴我
在AppBarLayout和cordinationLayout中設置工具欄本身將負責隱藏和顯示actionBar
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:id="@+id/cordinationLayout"
android:layout_height="match_parent">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:layout_scrollFlags="scroll|enterAlways"
app:popupTheme="@style/ThemeOverlay.AppCompat.Light" />
</android.support.design.widget.AppBarLayout>
</android.support.design.widget.CoordinatorLayout>
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