问题解决了。
我修改了两个地方：
1、res/xml/preferences.xml中，我把<CheckBoxPreference android:title="@string/t_showtipscreens" android:key="showTipScreens" android:defaultValue="ture" />改为<CheckBoxPreference android:title="@string/t_showtipscreens" android:key="showTipScreens" android:defaultValue="false" />
修改后，软件的设置中，show tip screens还是灰色的，默认打的勾，已经去掉了。
2、把ActMain.smali中的method protected onResume()V这一段程序全部删掉了。删掉的内容如下：
.method protected onResume()V
    .locals 6

    const/4 v3, 0x1

    const/4 v5, 0x0

    invoke-super {p0}, Landroid/app/Activity;->onResume()V

    invoke-static {p0}, Landroid/preference/PreferenceManager;->getDefaultSharedPreferences(Landroid/content/Context;)Landroid/content/SharedPreferences;

    move-result-object v0

    const-string v1, "showTipScreens"

    invoke-interface {v0, v1, v3}, Landroid/content/SharedPreferences;->getBoolean(Ljava/lang/String;Z)Z

    move-result v1

    const-string v2, "showTut"

    invoke-interface {v0, v2, v3}, Landroid/content/SharedPreferences;->getBoolean(Ljava/lang/String;Z)Z

    move-result v2

    const-string v3, "lastVer"

    const/4 v4, 0x0

    invoke-interface {v0, v3, v4}, Landroid/content/SharedPreferences;->getString(Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String;

    move-result-object v3

    if-eqz v2, :cond_3

    iget-object v1, p0, Lmco/prj/app/bwgofree/ActMain;->z:Lmco/prj/app/bwgofree/cs;

    if-eqz v1, :cond_0

    iget-object v1, p0, Lmco/prj/app/bwgofree/ActMain;->z:Lmco/prj/app/bwgofree/cs;

    invoke-virtual {v1}, Lmco/prj/app/bwgofree/cs;->b()Z

    move-result v1

    if-nez v1, :cond_1

    :cond_0
    new-instance v1, Lmco/prj/app/bwgofree/cx;

    iget-boolean v2, p0, Lmco/prj/app/bwgofree/ActMain;->D:Z

    invoke-direct {v1, p0, v2}, Lmco/prj/app/bwgofree/cx;-><init>(Landroid/content/Context;Z)V

    iput-object v1, p0, Lmco/prj/app/bwgofree/ActMain;->z:Lmco/prj/app/bwgofree/cs;

    :cond_1
    iget-object v1, p0, Lmco/prj/app/bwgofree/ActMain;->z:Lmco/prj/app/bwgofree/cs;

    invoke-virtual {v1}, Lmco/prj/app/bwgofree/cs;->a()V

    :cond_2
    :goto_0
    invoke-interface {v0}, Landroid/content/SharedPreferences;->edit()Landroid/content/SharedPreferences$Editor;

    move-result-object v0

    const-string v1, "lastVer"

    invoke-static {}, Lmco/prj/app/bwgofree/dt;->a()Ljava/lang/String;

    move-result-object v2

    invoke-interface {v0, v1, v2}, Landroid/content/SharedPreferences$Editor;->putString(Ljava/lang/String;Ljava/lang/String;)Landroid/content/SharedPreferences$Editor;

    move-result-object v0

    invoke-interface {v0}, Landroid/content/SharedPreferences$Editor;->commit()Z

    invoke-virtual {p0}, Lmco/prj/app/bwgofree/ActMain;->getResources()Landroid/content/res/Resources;

    move-result-object v0

    invoke-virtual {v0}, Landroid/content/res/Resources;->getConfiguration()Landroid/content/res/Configuration;

    move-result-object v0

    iget v0, v0, Landroid/content/res/Configuration;->orientation:I

    sput v0, Lmco/prj/app/bwgofree/et;->a:I

    invoke-direct {p0}, Lmco/prj/app/bwgofree/ActMain;->o()V

    return-void

    :cond_3
    invoke-static {}, Lmco/prj/app/bwgofree/dt;->a()Ljava/lang/String;

    move-result-object v2

    invoke-virtual {v2, v3}, Ljava/lang/String;->equals(Ljava/lang/Object;)Z

    move-result v2

    if-nez v2, :cond_6

    iget-object v1, p0, Lmco/prj/app/bwgofree/ActMain;->z:Lmco/prj/app/bwgofree/cs;

    if-eqz v1, :cond_4

    iget-object v1, p0, Lmco/prj/app/bwgofree/ActMain;->z:Lmco/prj/app/bwgofree/cs;

    invoke-virtual {v1}, Lmco/prj/app/bwgofree/cs;->b()Z

    move-result v1

    if-nez v1, :cond_5

    :cond_4
    new-instance v1, Lmco/prj/app/bwgofree/dc;

    iget-boolean v2, p0, Lmco/prj/app/bwgofree/ActMain;->D:Z

    invoke-direct {v1, p0, v2}, Lmco/prj/app/bwgofree/dc;-><init>(Landroid/content/Context;Z)V

    iput-object v1, p0, Lmco/prj/app/bwgofree/ActMain;->z:Lmco/prj/app/bwgofree/cs;

    :cond_5
    iget-object v1, p0, Lmco/prj/app/bwgofree/ActMain;->z:Lmco/prj/app/bwgofree/cs;

    invoke-virtual {v1}, Lmco/prj/app/bwgofree/cs;->a()V

    goto :goto_0

    :cond_6
    iget-boolean v2, p0, Lmco/prj/app/bwgofree/ActMain;->H:Z

    if-eqz v2, :cond_7

    if-nez v1, :cond_8

    :cond_7
    invoke-virtual {p0}, Lmco/prj/app/bwgofree/ActMain;->getResources()Landroid/content/res/Resources;

    move-result-object v1

    invoke-virtual {v1}, Landroid/content/res/Resources;->getConfiguration()Landroid/content/res/Configuration;

    move-result-object v1

    iget v1, v1, Landroid/content/res/Configuration;->orientation:I

    sget v2, Lmco/prj/app/bwgofree/et;->a:I

    if-ne v1, v2, :cond_2

    :cond_8
    iget-object v1, p0, Lmco/prj/app/bwgofree/ActMain;->z:Lmco/prj/app/bwgofree/cs;

    if-eqz v1, :cond_9

    iget-object v1, p0, Lmco/prj/app/bwgofree/ActMain;->z:Lmco/prj/app/bwgofree/cs;

    invoke-virtual {v1}, Lmco/prj/app/bwgofree/cs;->b()Z

    move-result v1

    if-nez v1, :cond_a

    :cond_9
    new-instance v1, Lmco/prj/app/bwgofree/cv;

    iget-boolean v2, p0, Lmco/prj/app/bwgofree/ActMain;->D:Z

    invoke-direct {v1, p0, v2, v5}, Lmco/prj/app/bwgofree/cv;-><init>(Landroid/content/Context;ZZ)V

    iput-object v1, p0, Lmco/prj/app/bwgofree/ActMain;->z:Lmco/prj/app/bwgofree/cs;

    :cond_a
    iput-boolean v5, p0, Lmco/prj/app/bwgofree/ActMain;->H:Z

    iget-object v1, p0, Lmco/prj/app/bwgofree/ActMain;->z:Lmco/prj/app/bwgofree/cs;

    invoke-virtual {v1}, Lmco/prj/app/bwgofree/cs;->a()V

    goto :goto_0
.end method

修改这两处，保存后重新编译。安装测试，问题解决。

能否发个给我？