对话框导致应用崩溃

这是问题，我有一个对话框仅在用户首次安装我的应用程序时出现。在使用我自己的设备进行测试后，我看到在弹出框后不进行任何操作都会导致应用崩溃。我的意图是让此对话框成为用户在安装应用程序后首先看到的东西。它的确出现了，但是如果用户在大约3秒钟内未按任何按钮，则会导致应用程序崩溃。但是，如果我在崩溃后重新启动该应用程序，则该框将永久显示，直到用户按下按钮为止，这是我为该框指定的目标。

这是logcat：

12-13 15:25:28.625: ERROR/WindowManager(15315): Activity com.nick.simplequiz.MainActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{41506ff0 V.E..... R....... 0,0-684,679} that was originally added here
    android.view.WindowLeaked: Activity com.nick.simplequiz.MainActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{41506ff0 V.E..... R....... 0,0-684,679} that was originally added here
    at android.view.ViewRootImpl.<init>(ViewRootImpl.java:458)
    at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:216)
    at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:94)
    at android.app.Dialog.show(Dialog.java:286)
    at com.nick.simplequiz.MainActivity.onCreate(MainActivity.java:216)
    at android.app.Activity.performCreate(Activity.java:5165)
    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1103)
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2419)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2520)
    at android.app.ActivityThread.access$600(ActivityThread.java:162)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1366)
    at android.os.Handler.dispatchMessage(Handler.java:99)
    at android.os.Looper.loop(Looper.java:158)
    at android.app.ActivityThread.main(ActivityThread.java:5751)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:511)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1083)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:850)
    at de.robv.android.xposed.XposedBridge.main(XposedBridge.java:115)
    at dalvik.system.NativeStart.main(Native Method)

这是根据logcat发生错误的行：

alertDialog.show();

是什么原因导致这种情况发生？

这是onCreate方法内部的代码：

AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(
                context);

    alertDialogBuilder.setCancelable(false);
    alertDialogBuilder.setTitle("...."); //Set the title of the box
    alertDialogBuilder.setMessage("....");
    alertDialogBuilder.setPositiveButton("Dismiss", new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int id) {
            dialog.cancel(); //when they click dismiss we will dismiss the box
            SharedPreferences.Editor edit2 = sp.edit();
            edit2.putInt("SHOW", 1);
            edit2.commit();
        }
    });
    alertDialogBuilder.setNegativeButton("", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialogInterface, int i) {
            .......
        }
    });
    AlertDialog alertDialog = alertDialogBuilder.create(); //create the box
    alertDialog.show(); //*************error happens here