我想要实现的是Button
CoordinatorLayout
容器
android.support.design.widget.CoordinatorLayout
android.widget.button
像FloatingActionButton
一样对SnackBar作出反应
那个使用FloatingActionButton
扩展CoordinatorLayout.Behavior<FloatingActionButton>
的行为。
我是否必须自己定义自定义行为,或者是否存在任何反应相同的通用组件?
答案 0 :(得分:1)
您可以定义自己的布局和自定义CoordinatorLayout.Behavior
您可以克隆FloatingActionButton
结构。
类似的东西:
@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
}
}
}
答案 1 :(得分:0)
您应该自定义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
}
}
,您必须使用以下两种方法之一将该行为分配给CoordinatorLayout的任何直接子视图
1-通过使用layout_behavior
自定义CoordinatorLayout
属性
<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,您也可以通过实现CoordinatorLayout.AttachedBehavior界面将行为分配给自己的自定义视图
class MyButton(context: Context, attrs: AttributeSet?)
: Button(context, attrs), CoordinatorLayout.AttachedBehavior {
...
override fun getBehavior(): CoordinatorLayout.Behavior<*> {
return SnackbarAwareBehaviour(context, null)
}
}