STAMINA模式使用自定义动画打破了片段加载 [英] STAMINA mode breaks fragment loading with custom animations

问题描述

此代码可在除激活了STAMINA模式的Sony设备上的所有设备上正常工作:

This code is working as expected on all devices except Sony devices with activated STAMINA mode:

int backStackCount = getSupportFragmentManager().getBackStackEntryCount();    
getFragmentManager()
                .beginTransaction()
                .setCustomAnimations(backStackCount == 0? R.animator.noanim : R.animator.slide_in,
                        R.animator.zoom_out, R.animator.zoom_in, backStackCount == 0? R.animator.noanim : R.animator.slide_out)
                .replace(R.id.container, fragment, String.valueOf(backStackCount))
                .addToBackStack(fragment.getClass().toString())
                .commit();

在STAMINA模式下，第一个片段正常加载，但是下一个片段根本不显示(屏幕保持黑色).如果我注释掉 setCustomAnimations 方法，则事务将按预期工作.这是怎么回事，如何使交易在激活的STAMINA模式下工作?

With STAMINA mode the first Fragment is loaded normally, but the next one does not show up at all (the screen remains black). If I comment out the setCustomAnimations method, the transaction works as expected. What is going on here, how to get the transaction working with activated STAMINA mode?

R.animator.slide_in:

R.animator.slide_in:

<?xml version="1.0" encoding="utf-8"?>
<set>
    <objectAnimator xmlns:android="http://schemas.android.com/apk/res/android"
                    android:interpolator="@android:anim/decelerate_interpolator"
                    android:valueFrom="1.0"
                    android:valueTo="0"
                    android:propertyName="xFraction"
                    android:duration="@android:integer/config_mediumAnimTime" />
</set>

编辑:由我自己解决，请参见下文

EDIT: solved by myself, see below

推荐答案

我使用了罗马·努里克(Roman Nurik)的方法来为片段.如果激活了STAMINA模式，则会禁用动画，并且仅以动画的结束值调用一次 setXFraction 方法.此时 View 的宽度为0，因此永远不会将其放置在正确的位置.

I used Roman Nurik's method for animating the Fragments. If the STAMINA mode is activated, the animations are disabled and the setXFraction method is called only once with the end value of the animation. The width of the View is 0 at this moment, so it's never going to be placed at the right position.

解决方案是将布局推迟到布局完成为止:

The solution is to delay the placement until the layout is finished:

public void setXFraction(float xFraction) {
    this.xFraction = xFraction;
    post(() -> {
        final int width = getWidth();
        setX((width > 0) ? (this.xFraction * width) : -9999);
    });
}

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