Question

当我设计我的设置页面以设置一些参数时，我遇到了以下问题：

当我打开设置页面时，它会在图片1 中显示默认值：
然后我将所有按钮设置为“打开”并返回主活动，如图片2 中所示：
当我从主要活动返回设置页面时，它会返回默认值，如图片3 中所示：我真正想要的是，当我在设置页面中设置所有参数时，当我从主活动返回时，设置页面应该与图片2相同（在设置页面之后），如果您对此有任何想法，我将非常感激问题，非常感谢：

修改：我添加了我的设置代码，如下所示： public class设置扩展了AppCompatActivity {

private SwitchButton acc, gra, lin, gyr, rot, mag, aur, aul, std, stc, scs, bat, act, bea;
private static  boolean macceleration, mgravity, mlinear_acceleration, mgyroscope, mrotation, mmagnetometer,
        maudio_recorder, maudio_level, mstep_detector, mstep_counter, mscreen_status, mbattery, mactivity, mbeacon_sets;


public static final Boolean[] bl = {macceleration, mgravity, mlinear_acceleration, mgyroscope, mrotation, mmagnetometer,
        maudio_recorder, maudio_level, mstep_detector, mstep_counter, mscreen_status, mbattery, mactivity, mbeacon_sets};

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

    ArrayList<SwitchButton> butt = new ArrayList<SwitchButton>();

    acc = (SwitchButton) findViewById(R.id.acceleration);
    gra = (SwitchButton) findViewById(R.id.gravity);
    lin = (SwitchButton) findViewById(R.id.linear_acceleration);
    gyr = (SwitchButton) findViewById(R.id.gyroscope);
    rot = (SwitchButton) findViewById(R.id.rotation);
    mag = (SwitchButton) findViewById(R.id.magnetometer);
    aur = (SwitchButton) findViewById(R.id.audio_recoder);
    aul = (SwitchButton) findViewById(R.id.audio_level);
    std = (SwitchButton) findViewById(R.id.step_detector);
    stc = (SwitchButton) findViewById(R.id.step_counter);
    scs = (SwitchButton) findViewById(R.id.screen_status);
    bat = (SwitchButton) findViewById(R.id.battery);
    act = (SwitchButton) findViewById(R.id.activity);
    bea = (SwitchButton) findViewById(R.id.beacon_sets);

    // 
    acc.setChecked(true);macceleration = true;
    gra.setChecked(true);mgravity = true;
    lin.setChecked(true);mlinear_acceleration = true;
    gyr.setChecked(true);mgyroscope = true;
    bea.setChecked(true);mbeacon_sets = true;

    final SwitchButton[] ar = {acc, gra, lin, gyr, rot, mag, aur, aul, std, stc, scs, bat, act, bea};


    for (int i = 0; i<ar.length;i++){
        final int j;
        j = i;
        ar[i].setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean b) {
                if (b) {
                    bl[j] = true;
                    // if selected yes, open this sensor
                } else {
                    bl[j] = false;
                    // if selected no, close this sensor
                }
            }
        });
    }

}

@Override
protected void onStart() {
    super.onStart();
}

@Override
protected void onStop() {
    super.onStop();
}
}

Answer 1

您没有向我们展示您的代码，但我认为这就是您所需要的

在SharedPrefernces中保存值

// MY_PREFS_NAME - a static String variable like: 
//public static final String MY_PREFS_NAME = "MyPrefsFile";
SharedPreferences.Editor editor = getSharedPreferences(MY_PREFS_NAME, MODE_PRIVATE).edit();
 editor.putBoolean(/*ButtonChecked boolean*/, "ButtonState");
 editor.apply();

从首选项中检索数据

SharedPreferences prefs = getSharedPreferences(MY_PREFS_NAME, MODE_PRIVATE); 
boolean restoredBool = prefs.getBoolean("ButtonState", null); //Use this boolean to enable and disable button in OnCreate method()

如何在不更改设置页面中的任何设置值的情况下转换为主要活动？

1 个答案: