android - 发生自定义异常时创建强制关闭

Question

对于一个 android 库项目，我正在尝试创建一个 Force Close 以向该库的用户显示他忘记做某事。

为此，我尝试创建我的自定义异常，并抛出它们，但我只有 LogCat 中的一些警告，仅此而已。

例如:

MyActivity.java

protected void onResume() {
    super.onResume();
    try {
        this.isMenuButtonOk();
    } catch(MyCustomException e) {
        e.printStackTrace();
    }
}
private void isMenuButtonOk() throws MyCustomException{
    if(!this.mOnCreateOptionsMenuHasBeenCalledFlag)
        throw new MyCustomException("OnCreateOptionMenu() needs to call it's parent. Or you need to deactivate the use of the menubutton");
}

LogCat

08-02 18:28:13.507    3866-3866/com.example.testlibrary W/System.err: com.example.testlibrary.MyCustomException: OnCreateOptionMenu() needs to call it's parent. Or you need to deactivate the use of the menubutton
08-02 18:28:13.511    3866-3866/com.example.testlibrary W/System.err: at com.example.testlibrary.lib.MyActivity.isMenuButtonOk(MyActivity.java:286)
08-02 18:28:13.511    3866-3866/com.example.testlibrary W/System.err: at com.example.testlibrary.lib.MyActivity.onResume(MyActivity.java:244)
08-02 18:28:13.511    3866-3866/com.example.testlibrary W/System.err: at com.example.testlibrary.MainActivity.onResume(MainActivity.java:304)
08-02 18:28:13.511    3866-3866/com.example.testlibrary W/System.err: at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1184)
08-02 18:28:13.511    3866-3866/com.example.testlibrary W/System.err: at android.app.Activity.performResume(Activity.java:5082)
08-02 18:28:13.511    3866-3866/com.example.testlibrary W/System.err: at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2565)
08-02 18:28:13.511    3866-3866/com.example.testlibrary W/System.err: at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2603)
08-02 18:28:13.511    3866-3866/com.example.testlibrary W/System.err: at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2089)
08-02 18:28:13.511    3866-3866/com.example.testlibrary W/System.err: at android.app.ActivityThread.access$600(ActivityThread.java:130)
08-02 18:28:13.511    3866-3866/com.example.testlibrary W/System.err: at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
08-02 18:28:13.511    3866-3866/com.example.testlibrary W/System.err: at android.os.Handler.dispatchMessage(Handler.java:99)
08-02 18:28:13.511    3866-3866/com.example.testlibrary W/System.err: at android.os.Looper.loop(Looper.java:137)
08-02 18:28:13.511    3866-3866/com.example.testlibrary W/System.err: at android.app.ActivityThread.main(ActivityThread.java:4745)
08-02 18:28:13.511    3866-3866/com.example.testlibrary W/System.err: at java.lang.reflect.Method.invokeNative(Native Method)
08-02 18:28:13.511    3866-3866/com.example.testlibrary W/System.err: at java.lang.reflect.Method.invoke(Method.java:511)
08-02 18:28:13.511    3866-3866/com.example.testlibrary W/System.err: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
08-02 18:28:13.515    3866-3866/com.example.testlibrary W/System.err: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
08-02 18:28:13.515    3866-3866/com.example.testlibrary W/System.err: at dalvik.system.NativeStart.main(Native Method)

当发生此异常时，您是否知道如何模拟/创建此强制关闭？

Answer 1

如果您捕获异常并打印堆栈跟踪，是的，您会收到“警告”并且应用程序不会崩溃 - 这就是捕获异常的意义所在。确保 MyCustomException 扩展 RuntimeException(或使用 RuntimeException)并且不要声明 isMenuButtonOk() 方法 throws你的异常(exception)。

例如:

protected void onResume() {
    super.onResume();
    this.isMenuButtonOk();
}

private void isMenuButtonOk(){
    if(!this.mOnCreateOptionsMenuHasBeenCalledFlag){
        throw new RuntimeException("OnCreateOptionMenu() needs to call it's parent. Or you need to deactivate the use of the menubutton");
    }
}