如何启动活动只有一次，当应用程序被打开了第一次？ [英] How to launch activity only once when app is opened for first time?

问题描述

我有一个活动，我只希望当应用程序运行在第一次运行。

I have an activity that i only want to run when the application is ran for the first time.

和永远不会再。这是一个Facebook的登录活动。我只是想发动一次当应用程序最初开的第一次。

And never again. It is a facebook login activity. I only want to launch it once when the app is initially opened for the first time.

我要如何去这样做？

推荐答案

我一般都做什么是添加一个检查一个特定的共享preference在主要活动：如果该共享preference缺少然后启动一个运行的活动，否则继续的主要活动。当您启动一次运行活动创建共享preference因此它被忽略下一次。

What I've generally done is add a check for a specific shared preference in the Main Activity : if that shared preference is missing then launch the single-run Activity, otherwise continue with the main activity . When you launch the single run Activity create the shared preference so it gets skipped next time.

修改：在我的 onResume 默认的活动我这样做：

EDIT : In my onResume for the default Activity I do this:

    SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getBaseContext());
    boolean previouslyStarted = prefs.getBoolean(getString(R.string.pref_previously_started), false);
    if(!previouslyStarted) {
        SharedPreferences.Editor edit = prefs.edit();
        edit.putBoolean(getString(R.string.pref_previously_started), Boolean.TRUE);
        edit.commit();
        showHelp();
    }

基本上我加载默认共享preferences并查找 previously_started 布尔preference。如果还没有设置我将它设置，然后启动帮助文件。我用它自动显示的帮助下，第一次安装的应用程序。

Basically I load the default shared preferences and look for the previously_started boolean preference. If it hasn't been set I set it and then launch the help file. I use this to automatically show the help the first time the app is installed.

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