java.lang.IllegalArgumentException: View=DecorView not attached to window manager(Android Dialog崩溃)

监控报警，Dialog偶现Crash。日志如下：

java.lang.IllegalArgumentException: View=DecorView@9d9a86 not attached to window managerat android.view.WindowManagerGlobal.findViewLocked(WindowManagerGlobal.java:619)at android.view.WindowManagerGlobal.removeView(WindowManagerGlobal.java:511)at android.view.WindowManagerImpl.removeViewImmediate(WindowManagerImpl.java:200)at android.app.Dialog.dismissDialog(Dialog.java:766)at android.app.Dialog.dismiss(Dialog.java:746)

对应代码如下：

private void doNetWork() {showLoading();//网络请求...hideLoading();
}private void showLoading() {if (loadingDialog == null) {loadingDialog = new LoadingDialog(this);}loadingDialog.show();
}private void hideLoading() {if (loadingDialog != null) {loadingDialog.dismiss();}
}

初步分析：dialog在diss时发现无可依附window，原因可能为异步网络请求返回时此Activity已经finish。

初步方案是：isShowLoading里有判断window所依赖的View是否为null，加上试试。

/*** @return Whether the dialog is currently showing.*/
public boolean isShowing() {return mDecor == null ? false : mDecor.getVisibility() == View.VISIBLE;
}

private void doNetWork() {showLoading();//网络请求inghideLoading();
}//....
private void hideLoading() {if (loadingDialog != null && loadingDialog.isShowing()) {loadingDialog.dismiss();}
}

为了mock还原场景，执行了如下代码，发现依然有“not attached to window manager”的日志报错。

private void doNetWork() {showLoading();finish();//网络请求inghideLoading();
}

需要判断当前依附Activity是否存在，最终优化代码如下：

private void hideLoading() {if (loadingDialog != null && loadingDialog.isShowing() && isValidActivity()) {loadingDialog.dismiss();}
}private boolean isValidActivity() {if (!isDestroyed() && !isFinishing()) {return true;}return false;
}

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