我正在制作一款汉字卡片应用程序。我想在一个XML布局中声明一个代表卡片正面的LinearLayout和另一个代表卡片背面的LinearLayout。
问题是,第二个LinearLayout始终不可见,而第一个则会正常地动画显示。
是否有任何方法可以在动画进行时进行方法调用?我想将第一个布局的可见性设置为“GONE”,并将第二个布局设置为“VISIBLE”?
或者有没有其他更好的实现翻转卡片的方法?
以下是我的代码。提前感谢您的帮助。
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/card_container_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:background="#ff825e4e" >
<LinearLayout
android:id="@+id/card_front_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_margin="10dp"
android:gravity="center"
android:background="@drawable/card_shape_front">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="傘"
android:textColor="#ff000000"
android:textSize="200sp"/>
</LinearLayout>
<LinearLayout
android:id="@+id/card_back_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:layout_margin="10dp"
android:background="@drawable/card_shape_front">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="16dp"
android:gravity="center"
android:text="QWERTY"
android:textColor="#ff000000"/>
</LinearLayout>
</LinearLayout>
FlashcardsFragment.java
public class FlashcardsFragment extends Fragment
{
private AnimatorSet showFrontAnim = new AnimatorSet();
private AnimatorSet showBackAnim = new AnimatorSet();
private boolean isShowingBack = false;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
View v = inflater.inflate(R.layout.fragment_flashcard, container, false);
LinearLayout cardFront = (LinearLayout) v.findViewById(R.id.card_front_layout);
LinearLayout cardBack = (LinearLayout) v.findViewById(R.id.card_back_layout);
// Load the animator sets from XML and group them together
AnimatorSet leftIn = (AnimatorSet) AnimatorInflater
.loadAnimator(getActivity(), R.animator.card_flip_left_in);
AnimatorSet rightOut = (AnimatorSet) AnimatorInflater
.loadAnimator(getActivity(), R.animator.card_flip_right_out);
AnimatorSet leftOut = (AnimatorSet) AnimatorInflater
.loadAnimator(getActivity(), R.animator.card_flip_left_out);
AnimatorSet rightIn = (AnimatorSet) AnimatorInflater
.loadAnimator(getActivity(), R.animator.card_flip_right_in);
leftIn.setTarget(cardFront);
rightOut.setTarget(cardBack);
showFrontAnim.playTogether(leftIn, rightOut);
leftOut.setTarget(cardFront);
rightIn.setTarget(cardBack);
showBackAnim.playTogether(leftOut, rightIn);
LinearLayout cardContainer = (LinearLayout)
v.findViewById(R.id.card_container_layout);
// Set the flip animation to be triggered on container clicking
cardContainer.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View v)
{
if (isShowingBack) {
showFrontAnim.start();
isShowingBack = false;
}
else {
showBackAnim.start();
isShowingBack = true;
}
}
});
return v;
}
}