如何保存Visibility android

Question

我试图保存我的卡片视图的可见性状态，起初我没有使用这些视图，但是如果用户按下按钮，卡片视图就会显示出来。有人可以帮助我，告诉我如何存储可见性，但是我找不到关于此主题的任何内容

非常感谢。

我尝试了shardPrefs，但不起作用

@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

尝试根据情况存储CardView内部每个SharedPrefs的可见性。并检索它们并在CardView初始化期间进行设置。检查以下代码：

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();
        }

    }
});

Answer 2

我不知道您到底尝试了什么，但是如果您只想存储状态供以后使用，您当然可以使用SharedPreferences完成此操作。您可以执行以下操作将状态另存为表示状态的字符串：

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();

然后您可以像这样读取这些值：

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");
...

，然后根据活动开始时的状态进行适当处理。请注意，getString()具有一个defValue参数（第二个参数），该参数是在首选项不存在时返回的值。

编辑：您可以选择将它们存储为int，但请注意，其中某些常量不是int的。看看这个，看看我的意思是：https://developer.android.com/reference/android/view/View