我有一个线性布局,当出现 Snackbar 时我想向上移动。
我看到了很多如何使用 FloatingButton 执行此操作的示例,但是常规视图呢?
我有一个线性布局,当出现 Snackbar 时我想向上移动。
我看到了很多如何使用 FloatingButton 执行此操作的示例,但是常规视图呢?
我将详细说明批准的答案,因为我认为有一个比那篇文章提供的更简单的实现。
我无法找到处理视图的通用移动的内置行为,但这是一个很好的通用选项(来自http://alisonhuang-blog.logdown.com/posts/290009-design-support -library-coordinator-layout-and-behavior链接在另一条评论中):
import android.content.Context;
import android.support.annotation.Keep;
import android.support.design.widget.CoordinatorLayout;
import android.support.design.widget.Snackbar;
import android.support.v4.view.ViewCompat;
import android.util.AttributeSet;
import android.view.View;
@Keep
public class MoveUpwardBehavior extends CoordinatorLayout.Behavior<View> {
public MoveUpwardBehavior() {
super();
}
public MoveUpwardBehavior(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
public boolean layoutDependsOn(CoordinatorLayout parent, View child, View dependency) {
return dependency instanceof Snackbar.SnackbarLayout;
}
@Override
public boolean onDependentViewChanged(CoordinatorLayout parent, View child, View dependency) {
float translationY = Math.min(0, ViewCompat.getTranslationY(dependency) - dependency.getHeight());
ViewCompat.setTranslationY(child, translationY);
return true;
}
//you need this when you swipe the snackbar(thanx to ubuntudroid's comment)
@Override
public void onDependentViewRemoved(CoordinatorLayout parent, View child, View dependency) {
ViewCompat.animate(child).translationY(0).start();
}
}
然后,在您的布局文件中添加一个 layout_behavior 如下:
<LinearLayout
android:id="@+id/main_content"
android:orientation="vertical"
app:layout_behavior="com.example.MoveUpwardBehavior"/>
其中 layout_behavior 是自定义行为的完整路径。除非您特别需要具有默认行为,否则无需将 LinearLayout 子类化,这似乎并不常见。
基于@Travis Castillo 的回答。修复了以下问题:
所以这里是MoveUpwardBehavior
Class 的固定代码:
import android.content.Context;
import android.support.annotation.Keep;
import android.support.design.widget.CoordinatorLayout;
import android.support.design.widget.Snackbar;
import android.support.v4.view.ViewCompat;
import android.util.AttributeSet;
import android.view.View;
@Keep
public class MoveUpwardBehavior extends CoordinatorLayout.Behavior<View> {
public MoveUpwardBehavior() {
super();
}
public MoveUpwardBehavior(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
public boolean layoutDependsOn(CoordinatorLayout parent, View child, View dependency) {
return dependency instanceof Snackbar.SnackbarLayout;
}
@Override
public boolean onDependentViewChanged(CoordinatorLayout parent, View child, View dependency) {
float translationY = Math.min(0, ViewCompat.getTranslationY(dependency) - dependency.getHeight());
//Dismiss last SnackBar immediately to prevent from conflict when showing SnackBars immediately after eachother
ViewCompat.animate(child).cancel();
//Move entire child layout up that causes objects on top disappear
ViewCompat.setTranslationY(child, translationY);
//Set top padding to child layout to reappear missing objects
//If you had set padding to child in xml, then you have to set them here by <child.getPaddingLeft(), ...>
child.setPadding(0, -Math.round(translationY), 0, 0);
return true;
}
@Override
public void onDependentViewRemoved(CoordinatorLayout parent, View child, View dependency) {
//Reset paddings and translationY to its default
child.setPadding(0, 0, 0, 0);
ViewCompat.animate(child).translationY(0).start();
}
}
此代码会提升用户在屏幕上看到的内容,并且在 SnackBar 显示时,用户可以访问布局中的所有对象。
如果您希望 SnackBar 覆盖对象而不是推送,并且用户确实可以访问所有对象,那么您需要更改方法onDependentViewChanged
:
@Override
public boolean onDependentViewChanged(CoordinatorLayout parent, View child, View dependency) {
float translationY = Math.min(0, ViewCompat.getTranslationY(dependency) - dependency.getHeight());
//Dismiss last SnackBar immediately to prevent from conflict when showing SnackBars immediately after eachother
ViewCompat.animate(child).cancel();
//Padding from bottom instead pushing top and padding from top.
//If you had set padding to child in xml, then you have to set them here by <child.getPaddingLeft(), ...>
child.setPadding(0, 0, 0, -Math.round(translationY));
return true;
}
和方法onDependentViewRemoved
:
@Override
public void onDependentViewRemoved(CoordinatorLayout parent, View child, View dependency) {
//Reset paddings and translationY to its default
child.setPadding(0, 0, 0, 0);
}
不幸的是,当用户滑动删除时,您将失去动画SnackBar
。你必须使用ValueAnimator
类来为填充更改制作动画,这会在这里产生一些冲突,你必须调试它们。
https://developer.android.com/reference/android/animation/ValueAnimator.html
任何关于滑动删除动画的评论SnackBar
表示赞赏。
如果您可以跳过该动画,那么您可以使用它。
无论如何,我推荐第一种类型。
您需要向 LinearLayout 添加行为并将其嵌入到 CoordinatorLayout 中。您可能想阅读以下内容: http: //alisonhuang-blog.logdown.com/posts/290009-design-support-library-coordinator-layout-and-behavior
我实现了这一点,发现当小吃店消失时,小吃店位置的视图仍然保持空白,显然如果设备上的动画已被禁用,这就是已知的。
为了解决这个问题,我更改了 onDependentViewChanged 方法以存储此行为所附加到的视图的初始 Y 位置。然后在删除小吃店时将该视图的位置重置为存储的 Y 位置
private static float initialPositionY;
@Override
public boolean onDependentViewChanged(CoordinatorLayout parent, View child, View dependency) {
initialPositionY = child.getY();
float translationY = Math.min(0, dependency.getTranslationY() - dependency.getHeight());
child.setTranslationY(translationY);
return true;
}
@Override
public void onDependentViewRemoved(CoordinatorLayout parent, View child, View dependency) {
super.onDependentViewRemoved(parent, child, dependency);
child.setTranslationY(initialPositionY);
}
除了 Travis Castillo 的回答:为了允许在 内触发连续的 SnackBars,onDependentViewChanged()
您必须取消任何可能正在进行的动画onDependentViewRemoved()
:
@Override
public boolean onDependentViewChanged(CoordinatorLayout parent, View child, View dependency) {
float translationY = Math.min(0, ViewCompat.getTranslationY(dependency) - dependency.getHeight());
ViewCompat.animate(child).cancel(); //cancel potential animation started in onDependentViewRemoved()
ViewCompat.setTranslationY(child, translationY);
return true;
}
在不取消的情况下,当一个 SnackBar 被另一个 SnackBar 替换时,LinearLayout 将跳到第二个 SnackBar 下方。
我编写了一个库,可以添加其他视图以使用 SnackProgressBar 进行动画处理。它还包括progressBar 和其他东西。试试看https://github.com/tingyik90/snackprogressbar
假设您有以下要制作动画的视图。
View[] views = {view1, view2, view3};
在您的活动中创建一个 SnackProgressBarManager 的实例,并包含要制作动画的视图。
SnackProgressBarManager snackProgressBarManager = new SnackProgressBarManager(rootView)
.setViewsToMove(views)
当 SnackProgressBar 显示或关闭时,这些视图将相应地动画化。
进一步改进 Travis Castillo 的回答。
这修复了 janky 动画 + 转换为 Kotlin。
无需手动进行 Y 平移,因为它是自动处理的。
手动进行 Y 平移实际上会使动画看起来很乱。
import android.content.Context
import android.util.AttributeSet
import android.view.View
import androidx.annotation.Keep
import androidx.coordinatorlayout.widget.CoordinatorLayout
import androidx.core.view.ViewCompat
import com.google.android.material.snackbar.Snackbar.SnackbarLayout
import kotlin.math.min
import kotlin.math.roundToInt
/**
* To use this, the parent container must be a CoordinatorLayout.
* This can be applied to a child ViewGroup with app:layout_behavior="com.example.MoveUpwardBehavior"
*/
@Keep
class MoveUpwardBehavior(context: Context?, attrs: AttributeSet?) : CoordinatorLayout.Behavior<View>(context, attrs) {
override fun layoutDependsOn(parent: CoordinatorLayout, targetView: View, snackBar: View): Boolean {
return snackBar is SnackbarLayout
}
/**
* @param parent - the parent container
* @param targetView - the view that applies the layout_behavior
* @param snackBar
*/
override fun onDependentViewChanged(parent: CoordinatorLayout, targetView: View, snackBar: View): Boolean {
val bottomPadding = min(0f, snackBar.translationY - snackBar.height).roundToInt()
//Dismiss last SnackBar immediately to prevent from conflict when showing SnackBars immediately after each other
ViewCompat.animate(targetView).cancel()
//Set bottom padding so the target ViewGroup is not hidden
targetView.setPadding(targetView.paddingLeft, targetView.paddingTop, targetView.paddingRight, -bottomPadding)
return true
}
override fun onDependentViewRemoved(parent: CoordinatorLayout, targetView: View, snackBar: View) {
//Reset padding to default value
targetView.setPadding(targetView.paddingLeft, targetView.paddingTop, targetView.paddingRight, 0)
}
}
@Markymark 提出了很好的解决方案,但是在快餐栏的第一帧上,translationY==0,在第二个translationY==full height 上并开始正确减小,因此依赖布局在第一帧上出现卡顿。这可以通过跳过第一帧 + 恢复原始填充作为良好的副作用来解决。
class MoveUpwardBehavior(context: Context?, attrs: AttributeSet?) : CoordinatorLayout.Behavior<View>(context, attrs), Parcelable {
var originalPadding = -1
constructor(parcel: Parcel) : this(
TODO("context"),
TODO("attrs")
) {
}
override fun layoutDependsOn(parent: CoordinatorLayout, targetView: View, snackBar: View): Boolean {
return snackBar is Snackbar.SnackbarLayout
}
/**
* @param parent - the parent container
* @param targetView - the view that applies the layout_behavior
* @param snackBar
*/
override fun onDependentViewChanged(parent: CoordinatorLayout, targetView: View, snackBar: View): Boolean {
if (originalPadding==-1) {
originalPadding = targetView.paddingBottom
return true
}
val bottomPadding = min(0f, snackBar.translationY - snackBar.height).roundToInt()
// println("bottomPadding: ${snackBar.translationY} ${snackBar.height}")
//Dismiss last SnackBar immediately to prevent from conflict when showing SnackBars immediately after each other
ViewCompat.animate(targetView).cancel()
//Set bottom padding so the target ViewGroup is not hidden
targetView.setPadding(targetView.paddingLeft, targetView.paddingTop, targetView.paddingRight, -(bottomPadding-originalPadding))
return true
}
override fun onDependentViewRemoved(parent: CoordinatorLayout, targetView: View, snackBar: View) {
//Reset padding to default value
targetView.setPadding(targetView.paddingLeft, targetView.paddingTop, targetView.paddingRight, originalPadding)
originalPadding = -1
}
override fun writeToParcel(parcel: Parcel, flags: Int) {
}
override fun describeContents(): Int {
return 0
}
companion object CREATOR : Parcelable.Creator<MoveUpwardBehavior> {
override fun createFromParcel(parcel: Parcel): MoveUpwardBehavior {
return MoveUpwardBehavior(parcel)
}
override fun newArray(size: Int): Array<MoveUpwardBehavior?> {
return arrayOfNulls(size)
}
}
}
不需要使用常规视图的协调器布局,将小吃栏对齐到视图的底部,并将按钮放在它的顶部,点击任何您的逻辑按钮显示小吃栏或线性布局。
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
/*snackbar code
<LinearLayout
android:id="@+id/linear_snack bar"
android:layout_width="match_parent"
android:layout_height="@dimen/margin_45"
android:layout_alignParentBottom="true"
android:layout_marginTop="@dimen/margin_0"
android:background="@color/dark_grey">
<TextView
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:background="@color/orange"
android:gravity="center"
android:textColor="@color/white"
android:textSize="@dimen/text_size_h7" />
<TextView
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:gravity="center"
android:textSize="@dimen/text_size_h7" />
</LinearLayout>
<View android:layout_above="@+id/linear_snack bar"
</RelativeLayout>