我嘗試保存卡片視圖的可見性狀態，起初我的視圖消失了，但是如果用戶按下按鈕，卡片視圖就會顯示。有人可以幫助我并告訴我如何存儲可見性，我找不到有關此主題的任何內容太感謝了。我嘗試了 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貢獻1111條經驗 獲得超0個贊
嘗試根據條件存儲每個CardView內部的可見性。SharedPrefs并在 CardView 初始化期間檢索并設置它們。檢查下面的代碼：
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貢獻1820條經驗 獲得超2個贊
當配置更改（旋轉）時，您可以從 onSaveInstanceState 檢索值，但是當您關閉應用程序（后退按鈕）時，您需要從持久性存儲中檢索狀態，例如共享首選項。
慕蓋茨4494581
TA貢獻1850條經驗 獲得超11個贊
我不知道你到底嘗試了什么，但如果你想做的只是存儲狀態以供以后使用，你當然可以使用 SharedPreferences 來實現這一點。您可以執行以下操作將狀態保存為表示狀態的字符串：
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();
然后你可以像這樣讀取這些值：
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");
...
然后根據活動開始時的狀態進行適當的處理。請注意，getString()有一個defValue參數（第二個參數），該參數是首選項不存在時要返回的值。
編輯：您可以選擇將它們存儲為 int，但請注意其中一些常量不是 int?？纯催@個就明白我的意思了：https ://developer.android.com/reference/android/view/View
添加回答
舉報
0/150
提交
取消