Android 设置自定义动画

Question

我一直在努力关注android flip card tutorial .按照指示，我创建了四个自定义动画师集

card_flip_right_in.xml:

<set xmlns:android="http://schemas.android.com/apk/res/android">
<objectAnimator
    android:valueFrom="1.0"
    android:valueTo="0.0"
    android:propertyName="alpha"
    android:duration="0" />

<objectAnimator
    android:valueFrom="180"
    android:valueTo="0"
    android:propertyName="rotationY"
    android:interpolator="@android:interpolator/accelerate_decelerate"
    android:duration="300" />

<objectAnimator
    android:valueFrom="0.0"
    android:valueTo="1.0"
    android:propertyName="alpha"
    android:startOffset="150"
    android:duration="1" />
</set>

card_flip_right_out.xml:

<set xmlns:android="http://schemas.android.com/apk/res/android">
<objectAnimator
    android:valueFrom="0"
    android:valueTo="-180"
    android:propertyName="rotationY"
    android:interpolator="@android:interpolator/accelerate_decelerate"
    android:duration="300" />

<objectAnimator
    android:valueFrom="1.0"
    android:valueTo="0.0"
    android:propertyName="alpha"
    android:startOffset="150"
    android:duration="1" />
</set>

card_flip_left_in.xml:

<set xmlns:android="http://schemas.android.com/apk/res/android">

<objectAnimator
    android:valueFrom="1.0"
    android:valueTo="0.0"
    android:propertyName="alpha"
    android:duration="0" />

<objectAnimator
    android:valueFrom="-180"
    android:valueTo="0"
    android:propertyName="rotationY"
    android:interpolator="@android:interpolator/accelerate_decelerate"
    android:duration="300" />

<objectAnimator
    android:valueFrom="0.0"
    android:valueTo="1.0"
    android:propertyName="alpha"
    android:startOffset="150"
    android:duration="1" />
</set>

card_flip_left_out.xml:

<set xmlns:android="http://schemas.android.com/apk/res/android">
<objectAnimator
    android:valueFrom="0"
    android:valueTo="180"
    android:propertyName="rotationY"
    android:interpolator="@android:interpolator/accelerate_decelerate"
    android:duration="300" />

<objectAnimator
    android:valueFrom="1.0"
    android:valueTo="0.0"
    android:propertyName="alpha"
    android:startOffset="150"
    android:duration="1" />
</set>

而且，我的 fragment 中有这个:

public class ContestantInfoFragment extends Fragment {

private Context context;

private String cName, cCountry, cDesc;

private TextView contestant_name, contestant_country, contestant_desc;
private ImageButton flip_btn;

public ContestantInfoFragment() {
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {

    View v = inflater.inflate(R.layout.fragment_contestant_info, container, false);

    context = inflater.getContext();

    Bundle bundle = this.getArguments();
    if(bundle != null) {
        cName = bundle.getString("NAME", "Problem loading contestant's name");
        cCountry = bundle.getString("COUNTRY", "Problem loading contestant's country");
        cDesc = bundle.getString("DESC", "Problem loading contestant's description");

        contestant_name = (TextView) v.findViewById(R.id.contestant_name);
        contestant_country = (TextView) v.findViewById(R.id.contestant_country);
        contestant_desc = (TextView) v.findViewById(R.id.contestant_desc);

        contestant_name.setText(cName);
        contestant_country.setText(cCountry);
        contestant_desc.setText(cDesc);
    }

    flip_btn = (ImageButton) v.findViewById(R.id.contestant_flip_btn);
    flip_btn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            getActivity().getSupportFragmentManager()
                    .beginTransaction()
                    .setCustomAnimations(R.animator.card_flip_right_in, R.animator.card_flip_right_out,
                                         R.animator.card_flip_left_in, R.animator.card_flip_left_out)
                    .replace(R.id.mainContent, new ContestantsFragment())
                                    .addToBackStack(null)
                                    .commit();
        }
    });

    return v;
}

但是，我在使用时遇到语法错误(红色 zipper 线)

.setCustomAnimations(R.animator.card_flip_right_in, R.animator.card_flip_right_out,
                                         R.animator.card_flip_left_in, R.animator.card_flip_left_out)

我得到的反馈是“Expected resource of type anim”任何人都知道为什么这不起作用？

Answer 1

根本原因:

Google 的示例使用 getFragmentManager()，我们明智的程序员正在尝试使用 getSupportFragmentManager()。

不幸的是，getSupportFragmentManager().setCustomAnimations() 签名不同。此外，objectAnimator 与 getSupportFragmentManager().setCustomAnimations()

不兼容

简而言之，Google 创建了一个无用的卡片翻转演示。如果你四处搜索，你会发现很多人都遇到过同样的问题。

---

解决方案:使用“Android Support Library v4 with NineOldAndroids”库 https://stackoverflow.com/a/18511350/550471

当然，Google 的支持库需要支持公开功能是有道理的。哈哈