如何在共享首选项中保存布尔变量

Question

你好，我不知道怎么了。我要创建一个开关按钮，该状态保存在“共享首选项”中，并且当“活动”启动时，开关按钮应处于已保存状态。但是，当我将“ if（isChecked）”之后的代码更改为“ editor.putBoolean（“ SOUND”，false）;“时，按钮始终为true。则开关按钮始终为假。请告诉我我做错了什么，或者给我工作代码。

public class MainActivity extends AppCompatActivity implements View.OnClickListener, CompoundButton.OnCheckedChangeListener {

    ConstraintLayout startLayout;
    AnimationDrawable animationDrawable;
    Button start;
    TextView rangAnzeige;
    static Switch sound;
    static Boolean ka;
    public static final String NAME = "MeinePrefs";
    public static SharedPreferences mySettings;


    @SuppressLint({"NewApi", "ResourceAsColor"})
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                WindowManager.LayoutParams.FLAG_FULLSCREEN);
        setContentView(R.layout.activity_main);

        startLayout = findViewById(R.id.startLayout);
        animationDrawable = (AnimationDrawable) startLayout.getBackground();
        animationDrawable.setEnterFadeDuration(4500);
        animationDrawable.setExitFadeDuration(4500);
        animationDrawable.start();

        sound = findViewById(R.id.sound);
        rangAnzeige = findViewById(R.id.ranganzeige);
        start = findViewById(R.id.starten);
        TextView tvhighscore = findViewById(R.id.highscore);

          mySettings = getSharedPreferences(NAME, MODE_PRIVATE);
         sound.setOnCheckedChangeListener(this);

         einstellungenladen();
}

           public void einstellungenladen() {

            ka = mySettings.getBoolean("SOUND",true);

            if (ka = true) {
                sound.setChecked(true);
            }
            else {
                sound.setChecked(false);
            }
    }

    @Override
    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
        if (isChecked) {
            SharedPreferences.Editor editor = mySettings.edit();
            editor.putBoolean("SOUND",true);
            editor.apply();

        }
        else {
            SharedPreferences.Editor editor = mySettings.edit();
            editor.putBoolean("SOUND",false);
            editor.apply();
        }
    }
}