Android使用共享首選項來檢查第一次運行

Question

嗨我試圖檢測我的應用程序是否已經第一次打開。如果有，我需要運行一個活動，一旦它第二次打開，它不應該再次顯示它。

這是我的代碼：

片段：

@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(); 
} 

但它是所有啓動的活動，當我再次啓動它，它凍結在一個白色的屏幕，但檢查記錄，它顯示像其他聲明不斷地反覆運行。我對Android很陌生，所以一些幫助或建議將不勝感激

Answer 1

試試這個辦法：

public class MainActivity extends Activity { 

    SharedPreferences prefs = null; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 

     prefs = getSharedPreferences(PREFS_NAME, MODE_PRIVATE); 
    } 

    @Override 
    protected void onResume() { 
     super.onResume(); 

     if (prefs.getBoolean("firstRun", true)) { 
      Intent intent = new Intent(MainActivity.this, TutorialFeaturedActivity.class); 
      startActivity(intent); 
      prefs.edit().putBoolean("firstRun", false).commit(); 
     } 
     else 
     { 
      //do nothing 
     } 

     getSpecials(); 
    } 
} 

Answer 2

它看起來像你的活動循環，因爲在你的else語句中，你告訴它重新開始在else語句中再次登陸的活動，等等等等。

Answer 3

嘗試使用editor.commit如果editor.apply不工作

editor.putBoolean("firstRun", false); 
editor.apply(); // Save all changed settings 
editor.commit(); // Save all changed settings 

Answer 4

在其他情況下，你的起點 「MainActivity.class」。 爲什麼從MainActivity的oncreate中加載MainActivity？ 它會形成一個循環。

從其他案例中刪除開始活動。

Answer 5

@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(); 
} 

Answer 6

請儘量將我的朋友

public class SessionManager { 

private static String TAG = SessionManager.class.getSimpleName(); 

SharedPreferences pref; 
SharedPreferences.Editor editor; 
Context _context; 

// Shared pref mode 
int PRIVATE_MODE = 0; 

// Shared preferences file name 
private static final String PREF_NAME = "ManageRun"; 

private static final String KEY_IS_RUN = "isRun"; 


public SessionManager(Context context) { 
    this._context = context; 
    pref = _context.getSharedPreferences(PREF_NAME, PRIVATE_MODE); 
    editor = pref.edit(); 
} 

public void setLatest(boolean isRun) { 

    editor.putBoolean(KEY_IS_RUN, isRun); 
    // commit changes 
    editor.commit(); 
    Log.d(TAG, "Manage Version session modified!"); 
} 

public boolean isLatest() { 
    return pref.getBoolean(KEY_IS_RUN, true); 
} 
} 

**在第一個活動檢查**

private SessionManager session; 


session = new SessionManager(getApplicationContext()); 

if (session.isLatest()) { 
    session.setLatest(false); 
    Log.w("onCreate: ","first time"); 
    Intent intent = new Intent(getActivity(), TutorialFeaturedActivity.class); 
    startActivity(intent); 
} 
else 
{ 
    Log.w("onCreate: ","second time"); 
    Intent intent = new Intent(getActivity(), MainActivity.class); 
    startActivity(intent); 
} 

Answer 7

private boolean isFirstTime() { 
     if (firstTime == null) { 
      SharedPreferences mPreferences = this.getSharedPreferences("first_time", Context.MODE_PRIVATE); 
      firstTime = mPreferences.getBoolean("firstTime", true); 
      if (firstTime) { 
       SharedPreferences.Editor editor = mPreferences.edit(); 
       editor.putBoolean("firstTime", false); 
       editor.commit(); 
      } 
     } 
     return firstTime; 
    } 



if (isFirstTime()) { 

        Intent i = new Intent(SplashActivity.this, Intro_slider.class); 
        i.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); 
        startActivity(i); 
        finish(); 

       } else { 
        final UserFunctions uf = new UserFunctions(); 
        if (uf.isUserLoggedIn(SplashActivity.this)) { 
         Intent i = new Intent(SplashActivity.this, MainActivity.class); 
         i.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); 
         startActivity(i); 
         finish(); 
        } else { 
         Intent i = new Intent(SplashActivity.this, Social_Login_Activity.class); 
         i.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); 
         startActivity(i); 
         finish(); 
        } 
       } 

試試這個代碼。