我想?yún)^(qū)分視圖的背景顏色，但我不知道該怎么做。誰能幫我完成任務(wù)。下面是我的 DatabaseHelper.java 類public List<HouseModal> get_Working_Area_Structures_House(int limit, int offset,String searched_Str) { if(database == null){ database = getWritableDatabase(); } List<HouseModal> list_krd= new ArrayList<>(); String selectQuery = "SELECT DISTINCT\n" + "\tWAS.Para_Structure_ID,\n" + "\tWAS.Para_Code || ' ' || CAST (WAS.Structure_No AS int) AS Structure_No,\n" + "\tST.Family_Count AS Families,\n" + "\tFM.Family_Members_Count AS Family_Members, \n" + "\t FM.Family_Migration AS Family_Migration\n" + "FROM\n" + "\t (\n" + "\t\t SELECT\n" + "\t\t\tP.Para_Code,\n" + "\t\t\tPS.Para_Structure_ID,\n" + "\t\t\tPS.Structure_No \n" + "\t\tFROM\n" + "\t\t\tPara_Structure AS PS\n" + "\t\tINNER JOIN Working_Area_Structures AS WAS ON PS.Para_Structure_ID = WAS.Para_Structure_ID\n" + "\t\tINNER JOIN Field_Station_Paras AS P ON PS.Para_ID = P.Para_ID \n" + "\t) AS WAS,\n" + "\t (\n" + "\tSELECT\n" + "\t\t\tKH.Para_Structure_ID,\n" + "\t\t\tCOUNT(DISTINCT KH.House_Hold_ID) AS Family_Count \n" + "\t\tFROM\n" + "\t\t\tKhandan_Register_Header AS KH\n" + "\t\tLEFT JOIN Family_Visit_History AS FVH ON KH.House_Hold_ID = FVH.House_Hold_ID \n" + "\t\tWHERE\n" + "\t\t(FVH.Visit_Status = 0 OR FVH.Visit_Status IS NULL)\n" + "\t\t--AND ((date(FVH.Visit_Date) >= (SELECT date(Starting_Date) FROM Working_Cycle WHERE DATE('NOW') BETWEEN date(Starting_Date)AND date(Ending_Date)) AND date(FVH.Visit_Date) <= (SELECT date(Ending_Date) FROM Working_Cycle WHERE DATE('NOW') BETWEEN date(Starting_Date)AND date(Ending_Date))) OR date(FVH.Visit_Date) IS NULL) \n" +
2 回答
蝴蝶刀刀
TA貢獻1801條經(jīng)驗 獲得超8個贊
放
if(holder.structureID.isEmpty(){
view.findViewById(R.id.structureID).setBackgroundColor(Color.parseColor("#CFD8DC")); //light gray
} else {
view.findViewById(R.id.structureID).setBackgroundColor(Color.parseColor("#FDFDE9")); //light yellow
}
在 if(view == null) 之外并進入 else 塊，以便在重繪時獲得更改，因為 recyclerview 將重用單元格，并且需要更改的任何內(nèi)容（文本、值、顏色）都需要也重新申請
編輯：只是為了澄清 - 如果您更改 getView() 方法以便您只為viewHolder 對象在 if/else 語句中，然后在下面更改視圖本身所需的所有值，它最終會變得更清晰、更易于閱讀
RISEBY
TA貢獻1856條經(jīng)驗 獲得超5個贊
如果您的項目為空，如何更改它的顏色或如何檢查它？
null 為空。
您應(yīng)該檢查 Null 以確保崩潰的安全性而不改變顏色。如果您想更改顏色，您應(yīng)該從數(shù)據(jù)庫中獲取一個特定字段，該字段顯示此列中沒有值或為空。然后你可以檢查它的顏色
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