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[英]FAB from design support library does not move upward when snackbar is shown
[英]Button has to act as FAB when the SnackBar is shown
我要實現的是在CoordinatorLayout
有一個Button
容器
android.support.design.widget.CoordinatorLayout
android.widget.button
對SnackBar的反應類似於FloatingActionButton
。
那個使用FloatingActionButton
。
擴展CoordinatorLayout.Behavior<FloatingActionButton>
行為。
我是否必須自己定義自定義行為,或者是否有任何通用組件以相同的方式做出反應?
您可以定義自己的布局和自定義CoordinatorLayout.Behavior
您可以克隆FloatingActionButton
結構。
就像是:
@CoordinatorLayout.DefaultBehavior(ButtonLayout.Behavior.class)
public class ButtonLayout extends LinearLayout {
public static class Behavior extends
android.support.design.widget.CoordinatorLayout.Behavior<ButtonLayout> {
public boolean layoutDependsOn(CoordinatorLayout parent, ButtonLayout child, View dependency) {
return dependency instanceof Snackbar.SnackbarLayout;
}
public boolean onDependentViewChanged(CoordinatorLayout parent, ButtonLayout child, View dependency) {
if(dependency instanceof Snackbar.SnackbarLayout) {
this.updateFabTranslationForSnackbar(parent, child, dependency);
}
return false;
}
private void updateFabTranslationForSnackbar(CoordinatorLayout parent, ButtonLayout fab, View snackbar) {
//copy from FloatingActionButton.Behavior
}
}
}
您應該制作自己的自定義CoordinatorLayout.Behavior
import android.content.Context
import android.util.AttributeSet
import android.view.View
import androidx.coordinatorlayout.widget.CoordinatorLayout
import com.google.android.material.snackbar.Snackbar
class SnackbarAwareBehaviour(context: Context, attrs: AttributeSet)
: CoordinatorLayout.Behavior<View>(context, attrs) {
override fun layoutDependsOn(parent: CoordinatorLayout, child: View, dependency: View): Boolean {
return dependency is Snackbar.SnackbarLayout
}
override fun onDependentViewChanged(parent: CoordinatorLayout, child: View, dependency: View): Boolean {
child.translationY = Math.min(0f, dependency.translationY - dependency.height)
return true
}
override fun onDependentViewRemoved(parent: CoordinatorLayout, child: View, dependency: View) {
child.translationY = 0f
}
}
並且您必須使用以下兩種方法之一將該行為分配給CoordinatorLayout的任何直接子視圖
1-通過使用layout_behavior
自定義CoordinatorLayout
屬性
<androidx.coordinatorlayout.widget.CoordinatorLayout
...>
...
<!-- The view which has the Behaviour should be a direct child to the CoordinatorLayout -->
<Button
...
app:layout_behavior="my.package.SnackbarAwareBehaviour"
/>
</androidx.coordinatorlayout.widget.CoordinatorLayout>
2-或者您也可以通過實現CoordinatorLayout.AttachedBehavior接口將行為分配給自己的自定義視圖
class MyButton(context: Context, attrs: AttributeSet?)
: Button(context, attrs), CoordinatorLayout.AttachedBehavior {
...
override fun getBehavior(): CoordinatorLayout.Behavior<*> {
return SnackbarAwareBehaviour(context, null)
}
}
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