Android 在 UI 线程上加载共享首选项

Question

在我的应用程序中，我实现了密码屏幕，但需要运行检查以查看是否应显示 Activity A 或 Activity B，并且此检查显然是共享首选项的结果，但是，打开时有明显的延迟应用程序 - 代码如下所示，但我如何优化它以使其更快地打开且没有延迟？

启动器活动

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    boolean loggedIn = PreferenceUtils.getBoolean(LauncherActivity.this, PreferenceUtils.LOGGED_IN_STATE);
    boolean passwordEnabled = PreferenceUtils.getBoolean(LauncherActivity.this, PreferenceUtils.APPLICATION_PASSWORD_ENABLED);

    Log.d(TAG, "LOGGED IN: " + loggedIn + " " + "PW: " + passwordEnabled);
    if (!loggedIn) {
        // Start Login Activity
        Intent intent = new Intent(LauncherActivity.this, ApplicationIntro.class);
        startActivity(intent);

        //PreferenceUtils.clearPreferences(LauncherActivity.this);
    } else {
        if (passwordEnabled) {
            // Start Password Activity
            Intent intent = new Intent(LauncherActivity.this, PasswordActivity.class);
            startActivity(intent);
        } else {
            // Start Main Activity
            Intent intent = new Intent(LauncherActivity.this, MainActivity.class);
            startActivity(intent);
        }
    }

    finish();
}

密码活动

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

    setupActionBar();

    setupPreferences();
    findViews();
    setupValues();
    setListeners();

}

...

private void setupPreferences() {
    attemptsRemaining = PreferenceUtils.getInt(PasswordActivity.this, PreferenceUtils.APPLICATION_PASSWORD_ATTEMPTS);
    storedPassword = PreferenceUtils.getString(PasswordActivity.this, PreferenceUtils.APPLICATION_PASSWORD);
    duressPassword = PreferenceUtils.getString(PasswordActivity.this, PreferenceUtils.DURESS_PASSWORD);
}

偏好工具

public static void saveString(Context context, String key, String value) {
    SharedPreferences preferences = new SecurePreferences(context);
    SharedPreferences.Editor editor = preferences.edit();
    editor.putString(key, value);
    editor.apply();
}

public static String getString(Context context, String key) {
    SharedPreferences preferences = new SecurePreferences(context);
    return preferences.getString(key, "");
}

public static void saveBoolean(Context context, String key, boolean value) {
    SharedPreferences preferences = new SecurePreferences(context);
    SharedPreferences.Editor editor = preferences.edit();
    editor.putBoolean(key, value);
    editor.apply();
}

public static boolean getBoolean(Context context, String key) {
    SharedPreferences preferences = new SecurePreferences(context);
    return preferences.getBoolean(key, false);
}

Answer 1

Check 阻塞了 UI 线程，这就是应用滞后的原因。使用AsyncTaskhere is a link to AsyncTask documentation 在后台线程中执行延迟进程是一个好习惯。 请随时提出更多问题。