我想在单击时用一点动画展开我的 CardView,并显示 TextView 的其余部分。
这是我的 .xml 文件
<LinearLayout android:id="@+id/yolo"
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<!-- A CardView that contains a TextView -->
<android.support.v7.widget.CardView
android:id="@+id/card_view1"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="top"
android:layout_marginBottom="10dp"
android:layout_marginEnd="20dp"
android:layout_marginStart="20dp"
android:layout_marginTop="10dp"
android:longClickable="true"
android:orientation="vertical"
card_view:cardCornerRadius="4dp"
card_view:cardElevation="4dp"
card_view:cardUseCompatPadding="true"
card_view:contentPadding="10dp"
>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
android:id="@+id/info_text"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textColor="#FF4444"
android:maxLines="1"
android:text="Did you know? Arnold Schwarzennegger was born in the Austria, Europe. "
android:textAlignment="center"
android:textSize="24sp"
/>
</LinearLayout>
</android.support.v7.widget.CardView>
<android.support.v7.widget.CardView
android:id="@+id/card_view2"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="top"
android:layout_marginBottom="10dp"
android:layout_marginEnd="20dp"
android:layout_marginStart="20dp"
android:layout_marginTop="10dp"
android:longClickable="true"
android:orientation="vertical"
card_view:cardCornerRadius="4dp"
card_view:cardElevation="4dp"
card_view:cardUseCompatPadding="true"
card_view:contentPadding="10dp"
>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
android:id="@+id/info_text2"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:maxLines="1"
android:text="Did you know? Arnold Schwarzennegger was born in the Austria, Europe. "
android:textAlignment="center"
android:textColor="#FF4444"
android:textSize="24sp"
/>
</LinearLayout>
</android.support.v7.widget.CardView>
<android.support.v7.widget.CardView
android:id="@+id/card_view3"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="top"
android:layout_marginBottom="10dp"
android:layout_marginEnd="20dp"
android:layout_marginStart="20dp"
android:layout_marginTop="10dp"
android:longClickable="true"
android:orientation="vertical"
card_view:cardCornerRadius="4dp"
card_view:cardElevation="4dp"
card_view:cardUseCompatPadding="true"
card_view:contentPadding="10dp"
>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
android:id="@+id/info_text3"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:maxLines="1"
android:text="Did you know? Arnold Schwarzennegger was born in the Austria, Europe. "
android:textAlignment="center"
android:textColor="#FF4444"
android:textSize="24sp"
/>
</LinearLayout>
</android.support.v7.widget.CardView>
<android.support.v7.widget.CardView
android:id="@+id/card_view"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="top"
android:layout_marginBottom="10dp"
android:layout_marginEnd="20dp"
android:layout_marginStart="20dp"
android:layout_marginTop="10dp"
android:longClickable="true"
android:orientation="vertical"
card_view:cardCornerRadius="4dp"
card_view:cardElevation="4dp"
card_view:cardUseCompatPadding="true"
card_view:contentPadding="10dp"
>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
android:id="@+id/info_et"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:maxLines="1"
android:text="Did you know? Arnold Schwarzennegger was born in the Austria, Europe. "
android:textAlignment="center"
android:textColor="#FF4444"
android:textSize="24sp"
/>
</LinearLayout>
</android.support.v7.widget.CardView>
这就是它的样子。我想让它展开,这样您就可以在带有一点展开动画的 TextView 中看到其他信息。
最佳答案
我用以下结构做同样的事情:
首先像下面这样创建 AnimationHelper 类:
public class AnimationHelper {
public static void expand(final View v) {
v.measure(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);
final int targetHeight = v.getMeasuredHeight();
v.getLayoutParams().height = 0;
v.setVisibility(View.VISIBLE);
Animation a = new Animation() {
@Override
protected void applyTransformation(float interpolatedTime, Transformation t) {
v.getLayoutParams().height = interpolatedTime == 1
? LinearLayout.LayoutParams.WRAP_CONTENT
: (int) (targetHeight * interpolatedTime);
v.requestLayout();
}
@Override
public boolean willChangeBounds() {
return true;
}
};
// 1dp/ms
a.setDuration((int) (targetHeight / v.getContext().getResources().getDisplayMetrics().density));
v.startAnimation(a);
}
public static void collapse(final View v) {
final int initialHeight = v.getMeasuredHeight();
Animation a = new Animation() {
@Override
protected void applyTransformation(float interpolatedTime, Transformation t) {
if (interpolatedTime == 1) {
v.setVisibility(View.GONE);
} else {
v.getLayoutParams().height = initialHeight - (int) (initialHeight * interpolatedTime);
v.requestLayout();
}
}
@Override
public boolean willChangeBounds() {
return true;
}
};
// 1dp/ms
a.setDuration((int) (initialHeight / v.getContext().getResources().getDisplayMetrics().density));
v.startAnimation(a);
}
}
然后在你的 xml 中放置你想要展开的布局,如下所示(在我的例子中是 view_popup_menu_expand
):
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/default_background"
android:orientation="vertical">
<android.support.v7.widget.CardView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/card_background">
<TextView
android:id="@+id/btn_expand"
style="@style/IconFont.Large"
android:layout_width="36dp"
android:layout_height="36dp"
android:layout_gravity="right"
android:text="@string/icon_chevron_up"
android:textColor="@color/color_primary_dark" />
</android.support.v7.widget.CardView>
<include layout="@layout/view_popup_menu_expand" />
</LinearLayout>
然后为您的 Card 设置一个监听器并将您的 view_popup_menu_exapand
传递给 AnimationHelper.expand()
您可以找到完整的实现 Here
关于android - 单击时使用 TextView 扩展 cardView,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/36952436/