SharedPreferences.edit() without a corresponding commit() or apply() call

问题

I'm using SharedPreferences for my apps' Intro Slider. However, I'm getting an error on this line:

class PrefManager {
    private SharedPreferences pref;
    private SharedPreferences.Editor editor;


    private static final String PREF_NAME = "welcome";

    private static final String IS_FIRST_TIME_LAUNCH = "IsFirstTimeLaunch";

    PrefManager(Context context) {
        int PRIVATE_MODE = 0;
        pref = context.getSharedPreferences(PREF_NAME, PRIVATE_MODE);
        editor = pref.edit();
    }

    void setFirstTimeLaunch(boolean isFirstTime) {
        editor.putBoolean(IS_FIRST_TIME_LAUNCH, isFirstTime);
        editor.commit();
    }

    boolean isFirstTimeLaunch() {
        return pref.getBoolean(IS_FIRST_TIME_LAUNCH, true);
    }

}

editor = pref.edit();

What happens if I don't call commit() or apply() after calling edit()?

回答1:

If you do not call commit() or apply(), your changes will not be saved.

Commit() writes the changes synchronously and directly to the file
Apply() writes the changes to the in-memory SharedPreferences immediately but begins an asynchronous commit to disk

回答2:

What happens if I don't call commit() or apply() after calling edit()?

Nothing.

回答3:

Simple Method

 sharedPreferences = getSharedPreferences("ShaPreferences", Context.MODE_PRIVATE);
                SharedPreferences.Editor editor = sharedPreferences.edit();
                boolean firstTime = sharedPreferences.getBoolean("first", true);
                if (firstTime) {
                    editor.putBoolean("first", false);
                    //For commit the changes, Use either editor.commit(); or  editor.apply();.
                    editor.commit();
                    Intent i = new Intent(SplashActivity.this, StartUpActivity.class);
                    startActivity(i);
                    finish();
                } else {
                        Intent i = new Intent(SplashActivity.this, HomeActivity.class);
                        startActivity(i);
                        finish();
                }
                    }

回答4:

You can add @SuppressLint("CommitPrefEdits") to ignore this message. In my case I am using it, because I want to use the same editor field in my class.

public class ProfileManager {

    private SharedPreferences preferences;
    private SharedPreferences.Editor editor;

    @SuppressLint("CommitPrefEdits")
    @Inject
    ProfileManager(SharedPreferences preferences) {
        this.preferences = preferences;
        this.editor = preferences.edit();
    }

    public void setAccountID(int accountID) {
        editor.putInt(AppConstants.ACCOUNT_ID_KEY, accountID)
                .apply();
    }

    public int getAccountID() {
        return preferences.getInt(AppConstants.ACCOUNT_ID_KEY, AppConstants.INVALID_ACCOUNT_ID);
    }

}

来源：https://stackoverflow.com/questions/42092753/sharedpreferences-edit-without-a-corresponding-commit-or-apply-call

标签

android

sharedpreferences