Android xml动画无法正常工作

Question

我有一个 Activity，它有一个 BottomNavigationView。它有 2 个项目（片段）。第一个片段必须从左侧进入并从左侧退出。同样，第二个片段必须从向右并向右退出。两个片段都正确进入，但退出的方式相反。看看这里：

enter_from_left.xml：

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:duration="300"
    android:shareInterpolator="false">
<translate
    android:interpolator="@android:anim/accelerate_decelerate_interpolator"
    android:fromXDelta="-100%"
    android:toXDelta="0%"
    >
</translate>
</set>

exit_to_left.xml：

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:duration="300"
    android:shareInterpolator="false"
    >
<translate
    android:interpolator="@android:anim/accelerate_decelerate_interpolator"
   android:fromXDelta="0%"
    android:toXDelta="-100%"
    >
</translate>
</set>

enter_from_right.xml：

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:duration="300"
    android:shareInterpolator="false">
<translate
    android:interpolator="@android:anim/accelerate_decelerate_interpolator"
    android:fromXDelta="100%"
    android:toXDelta="0%"
    >

</translate>
</set>

exit_to_right.xml：

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:duration="300"
    android:shareInterpolator="false">
<translate
    android:interpolator="@android:anim/accelerate_decelerate_interpolator"
     android:fromXDelta="0%"
    android:toXDelta="100%">

</translate>
</set>

代码：（两个片段的退出动画效果相反）

 private BottomNavigationView.OnNavigationItemSelectedListener mOnNavigationItemSelectedListener
            = new BottomNavigationView.OnNavigationItemSelectedListener() {

        @Override
        public boolean onNavigationItemSelected(@NonNull MenuItem item) {
            switch (item.getItemId()) {
                case R.id.sendSms:
                    FragmentTransaction transaction=getSupportFragmentManager().beginTransaction();
                    transaction.setCustomAnimations(R.anim.enter_from_left,R.anim.exit_to_left);
                    transaction.replace(R.id.fragcontainer,new SendSmsFragment());
                    transaction.commit();
                    return true;
                case R.id.receiveSms:
                    FragmentTransaction transaction1=getSupportFragmentManager().beginTransaction();
                    transaction1.setCustomAnimations(R.anim.enter_from_right,R.anim.exit_to_right);
                    transaction1.replace(R.id.fragcontainer,new ReceiveSmsFragment());
                    transaction1.commit();
                    return true;

            }
            return false;
        }
    };

Answer 1

试试 exit_to_right：transaction.setCustomAnimations(R.anim.enter_from_left,R.anim.exit_to_right);