how to save Visibility android

Question

i tried to save the Visibility state of my cardviews, at first i have the views as gone, but if the user pres the button the cardview will show up. Could someone help me and tell me how i could store the visibility, I can't find anything on this topic

Thank you so much.

I tried shardPrefs but is does not work

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

    cv1= (CardView) findViewById(R.id.cv1);
    cv2= (CardView) findViewById(R.id.cv2);
    cv3= (CardView) findViewById(R.id.cv3);
    cv4= (CardView) findViewById(R.id.cv4);
    cv5= (CardView) findViewById(R.id.cv5);
    cv6= (CardView) findViewById(R.id.cv6);
    cv7= (CardView) findViewById(R.id.cv7);
    cv8= (CardView) findViewById(R.id.cv8);
    cv9= (CardView) findViewById(R.id.cv9);

    AddBar = findViewById(R.id.AddBar);
    AddVoorraad =findViewById(R.id.AddVoorraad);

    AddBar.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            clickcount = clickcount + 1;



            if (clickcount == 1) {

                cv1.setVisibility(View.VISIBLE);




            }

            if (clickcount == 2) {
                cv2.setVisibility(View.VISIBLE);
            }


            if (clickcount == 3) {
                cv3.setVisibility(View.VISIBLE);


            }
            if (clickcount == 4) {
                cv4.setVisibility(View.VISIBLE);


            }

            if (clickcount == 5) {
                cv5.setVisibility(View.VISIBLE);
            }


            if (clickcount == 6) {
                cv6.setVisibility(View.VISIBLE);


            }

            if (clickcount==7 ){
                cv7.setVisibility(View.VISIBLE);


            }

        }

    });

    AddVoorraad.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            clickcountV=clickcountV+1;

            if (clickcountV==1) {
                cv8.setVisibility(View.VISIBLE);


            }

            if (clickcount==2) {
                cv9.setVisibility(View.VISIBLE);
            }

        }
    });

    cv1.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

        }
    });

    cv2.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

        }
    });

    cv3.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

        }
    });


}

}`

Answer 1

You can retrieve the value from onSaveInstanceState when the configuration changes ( rotation) but when you close your app (back button) then you need to retrieve the state from the persistence storage like shared preferences.

Answer 2

I don't know what you tried exactly, but if all you want to do is store the state for later use you can certainly accomplish that with SharedPreferences. You can do something like this to save the state as a string representing the state:

SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences();
SharedPreferences.Editor editor = prefs.edit();  
editor.putString("cv1_visibility", "VISIBLE");
editor.putString("cv2_visibility", "INVISIBLE");
editor.putString("cv3_visivility", "GONE");
...
editor.commit();

and then you can read these values like this:

SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences();
String cv1_state = prefs.getString("cv1_visibility", "NOT_FOUND");
String cv2_state = prefs.getString("cv2_visibility", "NOT_FOUND");
String cv3_state = prefs.getString("cv3_visibility", "NOT_FOUND");
...

and then handle it appropriately based on the state at the start of your activity. Note that getString() has a defValue parameter (the second one) which is the value to return if the preference does not exist.

EDIT: You can choose to store them as int, but be mindful that some of these constants are not int. Take a look at this to see what I mean: https://developer.android.com/reference/android/view/View

Answer 3

Try to store visibility for each CardView inside SharedPrefs on condition. And retrieve those and set during initialization of CardView. Check below code:

SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);

int isVisible = sharedPreferences.getInt("cv1", View.GONE);
cv1.setVisibility(isVisible);
isVisible = sharedPreferences.getInt("cv2", View.GONE);
cv2.setVisibility(isVisible);
isVisible = sharedPreferences.getInt("cv3", View.GONE);
cv3.setVisibility(isVisible);
isVisible = sharedPreferences.getInt("cv4", View.GONE);
cv4.setVisibility(isVisible);
isVisible = sharedPreferences.getInt("cv5", View.GONE);
cv5.setVisibility(isVisible);
isVisible = sharedPreferences.getInt("cv6", View.GONE);
cv6.setVisibility(isVisible);
isVisible = sharedPreferences.getInt("cv7", View.GONE);
cv7.setVisibility(isVisible);
isVisible = sharedPreferences.getInt("cv8", View.GONE);
cv8.setVisibility(isVisible);
isVisible = sharedPreferences.getInt("cv9", View.GONE);
cv9.setVisibility(isVisible);

AddBar.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        clickcount = clickcount + 1;

        if (clickcount == 1) {

            cv1.setVisibility(View.VISIBLE);
            sharedPreferences.edit().putInt("cv1", View.VISIBLE).commit();
        }

        if (clickcount == 2) {
            cv2.setVisibility(View.VISIBLE);
            sharedPreferences.edit().putInt("cv2", View.VISIBLE).commit();
        }

        if (clickcount == 3) {
            cv3.setVisibility(View.VISIBLE);
            sharedPreferences.edit().putInt("cv3", View.VISIBLE).commit();
        }

        if (clickcount == 4) {
            cv4.setVisibility(View.VISIBLE);
            sharedPreferences.edit().putInt("cv4", View.VISIBLE).commit();
        }

        if (clickcount == 5) {
            cv5.setVisibility(View.VISIBLE);
            sharedPreferences.edit().putInt("cv5", View.VISIBLE).commit();
        }

        if (clickcount == 6) {
            cv6.setVisibility(View.VISIBLE);
            sharedPreferences.edit().putInt("cv6", View.VISIBLE).commit();
        }

        if (clickcount==7 ){
            cv7.setVisibility(View.VISIBLE);
            sharedPreferences.edit().putInt("cv7", View.VISIBLE).commit();
        }
    }
});

AddVoorraad.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        clickcountV=clickcountV+1;

        if (clickcountV==1) {
            cv8.setVisibility(View.VISIBLE);
            sharedPreferences.edit().putInt("cv8", View.VISIBLE).commit();
        }

        if (clickcountV==2) {
            cv9.setVisibility(View.VISIBLE);
            sharedPreferences.edit().putInt("cv9", View.VISIBLE).commit();
        }

    }
});