如何在SharedPreferences中保存应用程序的主题？

Question

public class Utils {
private  static int sTheme;
public final static int THEME_DARK = 1;
public final static  int THEME_LIGHT = 0;
//Set the theme of the Activity and restart the activity
public static void changeToTheme(Activity activity, int theme) {
    sTheme = theme;
    activity.finish();
    activity.startActivity(new Intent(activity, activity.getClass()).addFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION));
    activity.overridePendingTransition(0,0);
}
//Set the theme of the activity according to the configuration
public static void onActivityCreateSetTheme(Activity activity) {
    switch (sTheme) {
        default:
        case THEME_LIGHT:
            activity.setTheme(R.style.AimBet_Light);
            break;
        case THEME_DARK:
            activity.setTheme(R.style.AimBet_Dark);
            break;
    }
}

SwitchMaterial themeSwitch;

SharedPreferences myPrefs;
SharedPreferences.Editor myEditor;

private static final String MY_PREFS = "switchPrefs";

private static final String DARK_MODE_SWITCH_STATUS = "switchStatus";

boolean dark_mode_switch_status;

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

    navigationView.getMenu().findItem(R.id.nav_theme).setActionView(new SwitchMaterial(this));

    themeSwitch = (SwitchMaterial) navigationView.getMenu().findItem(R.id.nav_theme).getActionView();

    myPrefs = getSharedPreferences(MY_PREFS, MODE_PRIVATE);
    myEditor = myPrefs.edit();

    dark_mode_switch_status = myPrefs.getBoolean(DARK_MODE_SWITCH_STATUS, false); //false is the default value

    themeSwitch.setChecked(dark_mode_switch_status);

    themeSwitch.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
            if (themeSwitch.isChecked()) {
                Utils.changeToTheme(MainActivity.this, Utils.THEME_DARK);
                myEditor.putBoolean(DARK_MODE_SWITCH_STATUS, true);
                myEditor.apply();
            } else {
                Utils.changeToTheme(MainActivity.this, Utils.THEME_LIGHT);
                myEditor.putBoolean(DARK_MODE_SWITCH_STATUS, false);
                myEditor.apply();
            }
        }
    });

}

Answer 1

首先，在切换时将数据保存到设备中。

myEditor.putBoolean(DARK_MODE_SWITCH_STATUS, isChecked)
myEditor.apply()

然后，在onCreate（）

if(myPrefs.getBoolean(DARK_MODE_SWITCH_STATUS)){
    Utils.changeToTheme(MainActivity.this, Utils.THEME_DARK);
} else {
    Utils.changeToTheme(MainActivity.this, Utils.THEME_LIGHT);
}

这真的应该管用。如果还有问题请告诉我！：）