如何退出时保存您的活动的状态？安卓 [英] How do you save your Activity's state when exiting? Android

问题描述

我有一个文本输入框，旋转器输入一个基本的应用程序，以及第二微调输入的阵列取决于在选项菜单中更改设置。

I have a basic app with text inputs, a spinner input, and a second spinner input whose array depends on a setting changed in the Options menu.

目前，当我preSS主页或preSS回报，而在我的应用程序，我要么返回桌面或循环回过旧的投入我把最近。

Currently, when I press Home or press Return while in my app, I either return to the desktop or cycle back through old inputs i put in recently.

我怎样才能prevent无法打开其自身的多个实例，以便有只有一个实例，在任何给定的时间运行，然后我怎么能保存数据输入到输入端，并选择在我的选项的设置我的应用程序菜单？

How can I prevent my app from opening multiple instances of itself so that there is only one instance running at any given time, and then how can I save the data entered into inputs, and the settings chosen in my option menu?

我是一个有点新的爪哇，所以我道歉，如果这是一个简单的问题。

I'm a bit new to Java, so I apologize if this is a simple problem.

推荐答案

在你acticity覆盖的onSaveInstanceState和onRestoreInstanceState。这些方法可以让您将数据保存到捆绑你还可以保存数据 preferences 。在我所有的应用我会覆盖的onSaveInstanceState和onRestoreInstanceState保存和负载值包。我还保存在onResume数据中的onPause preferences和负载preferences。此外，在的onCreate（捆绑savedInstanceState）我不喜欢这样的检查

In your acticity override onSaveInstanceState and onRestoreInstanceState. These methods will allow you to save data into a Bundle You can also save data to Preferences. In all of my applications I override both onSaveInstanceState and onRestoreInstanceState to save and load values to a Bundle. I also save data to preferences in onPause and load preferences in onResume. Also in onCreate(Bundle savedInstanceState) I do a check like this

    if(savedInstanceState != null)
    {
        m_mainView.restoreInstanceState(savedInstanceState);
    }
    else
    {
        m_mainView.loadGameFromDatabase(getPreferences(MODE_PRIVATE));
    }

这些做法一直为我工作。

These practices have always worked for me.

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