我尝试保存卡片视图的可见性状态，起初我的视图消失了，但是如果用户按下按钮，卡片视图就会显示。有人可以帮助我并告诉我如何存储可见性，我找不到有关此主题的任何内容太感谢了。我尝试了 shardPrefs 但不起作用@Overrideprotected 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); } } });
3 回答
catspeake
TA贡献1111条经验 获得超0个赞
尝试根据条件存储每个CardView内部的可见性。SharedPrefs并在 CardView 初始化期间检索并设置它们。检查下面的代码：
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();
}
}
});
DIEA
TA贡献1820条经验 获得超2个赞
当配置更改（旋转）时，您可以从 onSaveInstanceState 检索值，但是当您关闭应用程序（后退按钮）时，您需要从持久性存储中检索状态，例如共享首选项。
慕盖茨4494581
TA贡献1850条经验 获得超11个赞
我不知道你到底尝试了什么，但如果你想做的只是存储状态以供以后使用，你当然可以使用 SharedPreferences 来实现这一点。您可以执行以下操作将状态保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();
然后你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的处理。请注意，getString()有一个defValue参数（第二个参数），该参数是首选项不存在时要返回的值。
编辑：您可以选择将它们存储为 int，但请注意其中一些常量不是 int。看看这个就明白我的意思了：https ://developer.android.com/reference/android/view/View
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