存根类返回存根(“AnimatorSet！”)

Question

我试着制作了一个android FAB动画工具栏。我使用这个示例https://github.com/vpaliyX/FAB-Toolbar-Example来检查它是如何工作的，但我注意到了一件奇怪的事情。克隆示例中的AnimatorSet类看起来很好，但是当我尝试在我的项目中打开它时，我得到了如下信息。是实现问题还是导入问题？

package android.animation;

import android.animation.Animator;
import android.animation.TimeInterpolator;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

public final class AnimatorSet extends Animator {
    public AnimatorSet() {
        throw new RuntimeException("Stub!");
    }

    public void playTogether(Animator... items) {
        throw new RuntimeException("Stub!");
    }

    public void playTogether(Collection<Animator> items) {
        throw new RuntimeException("Stub!");
    }

    public void playSequentially(Animator... items) {
        throw new RuntimeException("Stub!");
    }

    public void playSequentially(List<Animator> items) {
        throw new RuntimeException("Stub!");
    }

    public ArrayList<Animator> getChildAnimations() {
        throw new RuntimeException("Stub!");
    }

    public void setTarget(Object target) {
        throw new RuntimeException("Stub!");
    }

    public void setInterpolator(TimeInterpolator interpolator) {
        throw new RuntimeException("Stub!");
    }

    public TimeInterpolator getInterpolator() {
        throw new RuntimeException("Stub!");
    }

    public AnimatorSet.Builder play(Animator anim) {
        throw new RuntimeException("Stub!");
    }

    public void cancel() {
        throw new RuntimeException("Stub!");
    }

    public void end() {
        throw new RuntimeException("Stub!");
    }

    public boolean isRunning() {
        throw new RuntimeException("Stub!");
    }

    public boolean isStarted() {
        throw new RuntimeException("Stub!");
    }

    public long getStartDelay() {
        throw new RuntimeException("Stub!");
    }

    public void setStartDelay(long startDelay) {
        throw new RuntimeException("Stub!");
    }

    public long getDuration() {
        throw new RuntimeException("Stub!");
    }

    public AnimatorSet setDuration(long duration) {
        throw new RuntimeException("Stub!");
    }

    public void setupStartValues() {
        throw new RuntimeException("Stub!");
    }

    public void setupEndValues() {
        throw new RuntimeException("Stub!");
    }

    public void pause() {
        throw new RuntimeException("Stub!");
    }

    public void resume() {
        throw new RuntimeException("Stub!");
    }

    public void start() {
        throw new RuntimeException("Stub!");
    }

    public AnimatorSet clone() {
        throw new RuntimeException("Stub!");
    }

    public String toString() {
        throw new RuntimeException("Stub!");
    }

    public long getTotalDuration() {
        throw new RuntimeException("Stub!");
    }

    public class Builder {
        Builder() {
            throw new RuntimeException("Stub!");
        }

        public AnimatorSet.Builder with(Animator anim) {
            throw new RuntimeException("Stub!");
        }

        public AnimatorSet.Builder before(Animator anim) {
            throw new RuntimeException("Stub!");
        }

        public AnimatorSet.Builder after(Animator anim) {
            throw new RuntimeException("Stub!");
        }

        public AnimatorSet.Builder after(long delay) {
            throw new RuntimeException("Stub!");
        }
    }
}

Answer 1

如果你想查看android框架类的源代码，那么你需要从SDK管理器下载它们。打开SDK管理器，查找"sources for Android x“，其中x是您正在开发的android版本，然后下载它。