java - Android 使用共享首选项来检查首次运行

Question

您好，我正在尝试检测我的应用程序是否是第一次打开。如果有，我需要运行一个 Activity ，一旦第二次打开它就不应该再次显示。

这是我的代码:

fragment :

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    //Intent intent = new Intent(getActivity(), TutorialFeaturedActivity.class);
    //startActivity(intent);

    SharedPreferences settings = this.getActivity().getSharedPreferences(PREFS_NAME, 0); // Get preferences file (0 = no option flags set)
    boolean firstRun = settings.getBoolean("firstRun", true); // Is it first run? If not specified, use "true"

    if(firstRun) {
        Log.w("onCreate: ","first time" );
        Intent intent = new Intent(getActivity(), TutorialFeaturedActivity.class);
        startActivity(intent);

        SharedPreferences.Editor editor = settings.edit(); // Open the editor for our settings
        editor.putBoolean("firstRun", false); // It is no longer the first run
        editor.apply(); // Save all changed settings
    } else {
        Log.w("onCreate: ","second time");
        Intent intent = new Intent(getActivity(), MainActivity.class);
        startActivity(intent);
    }

    getSpecials();
}

但它所做的只是启动 Activity ，当我再次启动它时，它卡住在白屏中，但检查它显示的日志，就像 else 语句不断地一遍又一遍地运行一样。我对 Android 相当陌生，因此我们将不胜感激一些帮助或建议

Answer 1

@Override
public void onCreate(Bundle savedInstanceState)
 {
    super.onCreate(savedInstanceState);
    SharedPreferences pref = YourActivityName.this.getSharedPreferences(PREFS_NAME,0);
    SharedPreferences.Editor editor= pref.edit();
    boolean firstRun = pref.getBoolean("firstRun", true); 
    if(firstRun)
    {
        Log.i("onCreate: ","first time" );
        editor.putBoolean("firstRun",false);
        editor.commit();
        Intent intent = new Intent(getActivity(), TutorialFeaturedActivity.class);
        startActivity(intent);
    }
    else
    {
        Log.i("onCreate: ","second time");
        Intent intent = new Intent(getActivity(), MainActivity.class);
        startActivity(intent);

    }
   // getSpecials();
}