在Handler队列里面执行引发的【java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState】

[Jiiiiiin]

我们使用bugtags收集到一个如下的崩溃日志，目前线上项目使用的lib版本是：

ext.ANDROID_SUPPORT_LIBRARY_VERSION = "27.1.1"

dependencies {
    // ..... 省略
    // Android Support包
    api 'com.android.support:support-v4:' + ANDROID_SUPPORT_LIBRARY_VERSION
    api 'com.android.support:appcompat-v7:' + ANDROID_SUPPORT_LIBRARY_VERSION
    api 'com.android.support:design:' + ANDROID_SUPPORT_LIBRARY_VERSION
    api 'com.android.support:cardview-v7:' + ANDROID_SUPPORT_LIBRARY_VERSION


    // Fragmentation https://github.com/YoKeyword/Fragmentation/releases
    api 'me.yokeyword:fragmentation:1.3.3'
    api 'me.yokeyword:fragmentation-swipeback:1.3.3'

收集日志截图：

java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState
	at android.support.v4.app.FragmentManagerImpl.checkStateLoss(FragmentManagerImpl.java:2053)
	at android.support.v4.app.FragmentManagerImpl.enqueueAction(FragmentManagerImpl.java:2079)
	at android.support.v4.app.FragmentManagerImpl.popBackStack(FragmentManagerImpl.java:791)
	at android.support.v4.app.FragmentationMagician$1.run(FragmentationMagician.java:87)
	at android.support.v4.app.FragmentationMagician.hookStateSaved(FragmentationMagician.java:183)
	at android.support.v4.app.FragmentationMagician.popBackStackAllowingStateLoss(FragmentationMagician.java:84)
	at me.yokeyword.fragmentation.TransactionDelegate$6.run(TransactionDelegate.java:171)
	at me.yokeyword.fragmentation.queue.ActionQueue.handleAction(ActionQueue.java:53)
	at me.yokeyword.fragmentation.queue.ActionQueue.enqueueAction(ActionQueue.java:45)
	at me.yokeyword.fragmentation.queue.ActionQueue.access$000(ActionQueue.java:17)
	at me.yokeyword.fragmentation.queue.ActionQueue.access$100(ActionQueue.java:17)
	at me.yokeyword.fragmentation.queue.ActionQueue$1.run(ActionQueue.java:37)
	at android.os.Handler.handleCallback(Handler.java:739)
	at android.os.Handler.dispatchMessage(Handler.java:95)
	at android.os.Looper.loop(Looper.java:158)
	at android.app.ActivityThread.main(ActivityThread.java:7233)
	at java.lang.reflect.Method.invoke(Method.java)
	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)

重现步骤：

感觉是应用从后台重新恢复到前台的时候爆出来的；

请问这种问题怎么解决呢？

而且这个异常没有被fragmention统一异常处理收集：

public final void configure() {
        initIcons();
        VP_CONFIGS.put(ConfigKeys.CONFIG_READY, true);
        final boolean isDebug = ViewPlus.IS_DEBUG();
        // 初始化Logger
        Logger.addLogAdapter(new AndroidLogAdapter());
        if (isDebug) {
            // 设置日志级别
            LoggerProxy.setLEVEL(LoggerProxy.DEBUG);
            // 建议在Application里初始化
            Fragmentation.builder()
                    // 显示悬浮球 ; 其他Mode:SHAKE: 摇一摇唤出   NONE：隐藏
                    .stackViewMode(Fragmentation.BUBBLE)
                    .debug(true)
                    // 在遇到After onSaveInstanceState时，不会抛出异常，会回调到下面的ExceptionHandler
                    .handleException(e -> {
                        // 建议在该回调处上传至我们的Crash监测服务器
                        // 以Bugtags为例子: 手动把捕获到的 Exception 传到 Bugtags 后台。
                        LoggerProxy.e(e, "Fragmentation 统一异常捕获发现错误");
                    })
                    .install();
        } else {
            // 设置日志级别
            LoggerProxy.setLEVEL(LoggerProxy.ERROR);
        }
        // 需要插件初始化完毕之后在进行初始化
        Utils.init((Application) ViewPlus.getApplicationContext());
    }

走的不是上面的渠道爆出来的

@williamwue
@YoKeyword

[Jiiiiiin]

同样是从后台进入前台还出现另外一种问题：

java.lang.NullPointerException: There is no Fragment in the FragmentManager, maybe you need to call loadRootFragment() first!
	at me.yokeyword.fragmentation.TransactionDelegate$6.run(TransactionDelegate.java:158)
	at me.yokeyword.fragmentation.queue.ActionQueue.handleAction(ActionQueue.java:53)
	at me.yokeyword.fragmentation.queue.ActionQueue.enqueueAction(ActionQueue.java:45)
	at me.yokeyword.fragmentation.queue.ActionQueue.access$000(ActionQueue.java:17)
	at me.yokeyword.fragmentation.queue.ActionQueue.access$100(ActionQueue.java:17)
	at me.yokeyword.fragmentation.queue.ActionQueue$1.run(ActionQueue.java:37)
	at android.os.Handler.handleCallback(Handler.java:739)
	at android.os.Handler.dispatchMessage(Handler.java:95)
	at android.os.Looper.loop(Looper.java:135)
	at android.app.ActivityThread.main(ActivityThread.java:5401)
	at java.lang.reflect.Method.invoke(Method.java)
	at java.lang.reflect.Method.invoke(Method.java:372)
	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:919)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:714)

现在的执行代码是这样的，麻烦大佬帮忙看看是否存在问题：

public abstract class AbstractProxyActivity extends SupportActivity {

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        initContainer(savedInstanceState);
    }

    /**
     * 返回根Delegate
     *
     * @return
     */
    public abstract AbstractViewPlusDelegate setRootDelegate();

    private void initContainer(@Nullable Bundle savedInstanceState) {
        final ContentFrameLayout container = new ContentFrameLayout(this);
        container.setId(R.id.delegate_container);
        setContentView(container);
        if (savedInstanceState == null) {
            // 初次加载主入口activity的时候设置根Delegate
            loadRootFragment(R.id.delegate_container, setRootDelegate());
        }
    }

[YoKeyword]

@Jiiiiiin 找到了原因， support v27.1.1 检查StateLoss的机制变了

    @Override
    public boolean isStateSaved() {
        return mStateSaved || mStopped; // 在27.1.1之前，只检查mStateSaved
    }

在Fragmentation FragmentationMagician中

    private static void hookStateSaved(FragmentManager fragmentManager, Runnable runnable) {
        ...
        if (isStateSaved(fragmentManager)) {
            fragmentManagerImpl.mStateSaved = false; // 在之前版本中hack了该参数，让其绕过检查
            runnable.run();
            fragmentManagerImpl.mStateSaved = true;
        } else {
            runnable.run();
        }
    }

暂时提供2个方案：
1、退回27.1.0
2、不要在Fragment onStop()后出栈，保证Fragment在可见时出栈

PS： 后续我会看下mStop的作用，如果可行，会考虑同时hack

另外:
java.lang.NullPointerException: There is no Fragment in the FragmentManager, maybe you need to call loadRootFragment() first!

该异常只会出现在 startWithPop() 或者startWithPopTo()时， 先排查异常发生的位置

[YoKeyword]

v1.3.4兼容了该问题

[Jiiiiiin]

@YoKeyword thx

[wilsonssss]

support 28.0.0 comes up again