如何解決Can not perform this action after onSaveInstanceState

先分析問題發(fā)生原因

private void checkStateLoss() {

    if (isStateSaved()) {

        throw new IllegalStateException(

        "Can not perform this action after onSaveInstanceState");

    }

}

public boolean isStateSaved() {

    // See saveAllState() for the explanation of this.  We do this for

    // all platform versions, to keep our behavior more consistent between

    // them.

    return mStateSaved ||mStopped;

}

通過分析源碼我們找到，當(dāng)activity執(zhí)行了onSaveInstanceState或onStop方法后，操作子fragment系統(tǒng)會(huì)檢測(cè)當(dāng)前狀態(tài)并拋出異常。

解決方法：

配合Lifecycle,我們只需要重寫添加：

lifecycleScope?.launchWhenResumed{

    //show fragment dialog

}

這樣系統(tǒng)會(huì)自動(dòng)在resumed后再?gòu)棾鰀ialogfragment，也能避免Can not perform this action after onSaveInstanceState
這樣即使是activity在后臺(tái)情況下返回前臺(tái)，也會(huì)立即彈窗。