一个少见的线上 Crash 分析：Caused by: java.lang.IllegalStateException: View DecorView@2918947[RoomManageActivi

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于 2020-01-10 15:08:51 发布 · 908 阅读

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本文通过一个罕见的线上Crash案例，分析了由于在不同线程中两次显示Dialog导致的`java.lang.IllegalStateException`。详细探讨了Android中Window、DecorView和WindowManagerGlobal的关系，解释了为何重复添加相同View到WindowManagerGlobal会导致崩溃，并提供了问题的解决思路。

Take the Dialog for example.

Judge from the Android source code, let’s watch what happened when you called method Dialog#show() method. The code can be simplified as below:

    public void show() {
   
   
        if (mShowing) {
   
   
            // ...
            return;
        }
        // ...
        mDecor = mWindow.getDecorView();
        mWindowManager.addView(mDecor, l);
        // ...
        mShowing = true;
        // ...
    }