Android 如何对嵌套类使用行为?
当AppToolBar隐藏时,我正在进行隐藏视图的操作。如果我将带有行为的Cardview放在定义了CoordinatorLayout的同一xml中,这个方法就有效了。然而,我需要更深层的层次结构,当我在片段中使用它时,它不再起作用Android 如何对嵌套类使用行为?,android,android-coordinatorlayout,Android,Android Coordinatorlayout,当AppToolBar隐藏时,我正在进行隐藏视图的操作。如果我将带有行为的Cardview放在定义了CoordinatorLayout的同一xml中,这个方法就有效了。然而,我需要更深层的层次结构,当我在片段中使用它时,它不再起作用 public class BottomBehaviour extends CoordinatorLayout.Behavior<CardView> { int totalHeigh; float dencity; int statusBar
public class BottomBehaviour extends CoordinatorLayout.Behavior<CardView> {
int totalHeigh;
float dencity;
int statusBarHeigh;
public BottomBehaviour() {
}
public BottomBehaviour(Context context, AttributeSet attrs) {
super(context, attrs);
dencity=context.getResources().getDisplayMetrics().density;
int height = context.getResources().getDisplayMetrics().heightPixels;
statusBarHeigh = getStatusBarHeight(context);
totalHeigh=height;
//totalHeigh = (int) (context.getResources().getDisplayMetrics().heightPixels - (56 * dencity));
Log.e("mcheck", "BottomBehaviour: ");
}
public int getStatusBarHeight(Context context) {
int result = 0;
int resourceId = context.getResources().getIdentifier("status_bar_height", "dimen", "android");
if (resourceId > 0) {
result = context.getResources().getDimensionPixelSize(resourceId);
}
return result;
}
@Override
public boolean layoutDependsOn(CoordinatorLayout parent, CardView child, View dependency) {
return dependency instanceof AppBarLayout;
}
@Override
public boolean onDependentViewChanged(CoordinatorLayout parent, CardView child, View dependency) {
int top = (int)(totalHeigh-child.getHeight()-(dependency.getY()));
child.setTranslationY(top);
Log.e("mcheck", "onDependentViewChanged: "+(dependency.getY()-statusBarHeigh)+" height "+dependency.getHeight()/dencity);
return super.onDependentViewChanged(parent, child, dependency);
}
}
public类行为扩展了CoordinatorLayout.Behavior{
整数总高度;
浮动密集度;
内特状态巴海;
公众行为{
}
公共行为(上下文、属性集属性){
超级(上下文,attrs);
dencity=context.getResources().getDisplayMetrics().density;
int height=context.getResources().getDisplayMetrics().heightPixels;
statusBarHeigh=GetStatusBarHeigh(上下文);
总高度=高度;
//totalHeigh=(int)(context.getResources().getDisplayMetrics().heightPixels-(56*dencity));
Log.e(“mcheck”,“bottombehavior:”);
}
public int getStatusBarHeight(上下文){
int结果=0;
int resourceId=context.getResources().getIdentifier(“status\u bar\u height”、“dimen”、“android”);
如果(资源ID>0){
结果=context.getResources().getDimensionPixelSize(resourceId);
}
返回结果;
}
@凌驾
公共布尔布局依赖项(协调布局父项、CardView子项、视图依赖项){
返回AppBarLayout的依赖实例;
}
@凌驾
公共布尔onDependentViewChanged(协调布局父项、CardView子项、视图依赖项){
inttop=(int)(totalHeigh child.getHeight()-(dependency.getY());
child.setTranslationY(顶部);
Log.e(“mcheck”、“onDependentViewChanged:”+(dependency.getY()-statusBarHeigh)+“height”+dependency.getHeight()/dencity);
返回super.onDependentViewChanged(父、子、依赖项);
}
}
一些片段xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/tools"
android:orientation="vertical">
<android.support.v7.widget.RecyclerView
android:id="@+id/list"
android:layout_width="match_parent"
android:layout_height="0dip"
android:layout_weight="1" />
<android.support.v7.widget.CardView
android:layout_width="match_parent"
android:layout_height="56dip"
app:layout_behavior="ua.miui.forum.widget.BottomBehaviour"
card_view:cardCornerRadius="0dip"
card_view:cardElevation="8dip">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal">
</LinearLayout>
</android.support.v7.widget.CardView>
</LinearLayout>
CoordinatorLayout.Behavior
s仅当目标视图,即包含app:layout\u Behavior=“ua.miui.forum.widget.bottomBehavior”
的视图是CoordinatorLayout
的直接后代时才起作用。否则,它将不会接收嵌套的滚动事件
如果您的LinearLayout
是CoordinatorLayout
的直接子级,请将行为添加到它,然后您可能应该调整您的cardwiew
查看视图id,并对嵌套滚动进行操作