我有一個ArrayList
>>它包含某些鍵值條目。如: -從ArrayList <HashMap <String,String >>>獲取鍵值到另一個數組中
ArrayList<HashMap<String, String>> myList = new ArrayList<HashMap<String,String>>();
HashMap<String,String> map = new HashMap<String,String>();
map.put("NewId", newId);
map.put("Title", title);
map.put("Description", description);
myList.add(map);
「NewId」對於多個條目可以是相似的。
另外我有一個顏色數組: -
String[] colors = new String[]{"#1F1A17", "#62934D", "#F9B03F", "#7959BC", "#74B8DE", "#E65641", "#7CC8BB", "#D7CE5D", "#D6BE95", "#B694D1"};
我希望有一個巢組全部用相同的「NEWID」條目在一起,爲它們分配第一顏色,其他項目旁邊類似的「NEWID」用第二種顏色等等,直到具有前10個相同「NewId」的項目被賦予它們各自的顏色。
例如: - 分組
NewId Title Description
101 title1 des1
102 title2 des2
103 title3 des3
101 title4 des4
102 title5 des5
103 title6 des6
分組後,前
NewId Title Description
101 title1 des1 ------> color1
101 title4 des4 ------> color1
102 title2 des2 ------> color2
102 title5 des5 ------> color2
103 title3 des3 ------> color3
103 title6 des6 ------> color3
我所做的尚未: -
public class MyList {
private ArrayList<HashMap<String, String>> list = new ArrayList<>();
public boolean add(HashMap<String, String> map) {
return list.add(map);
}
public void setColor(String newId, String color) {
for (HashMap<String, String> m : list)
if (m.containsKey(newId))
m.put("color", color);
}
public String getGroupKey(String key, int i) {
ArrayList<String> uniqeList = getUniqKeyList(key);
Collections.sort(uniqeList);
return uniqeList.get(i);
}
public ArrayList<String> getUniqKeyList(String key){
ArrayList<String> l = new ArrayList<>();
for (HashMap<String, String> m : list)
if(!l.contains(m.get(key)))
l.add(m.get(key));
return l;
}
}
public static void main(String[] args) throws Exception {
MyList myList = new MyList();
HashMap<String,String> map = new HashMap<String,String>();
map.put("NewId", newId);
map.put("Title", title);
map.put("Description", description);
myList.add(map);
String[] colors = new String[]{"#1F1A17", "#62934D","#B694D1"};
int i=0;
while (true) {
if(i == colors.length)
break;
String s = myList.getGroupKey("NewId", i);
if(s == null)
break;
else
myList.setColor(s, colors[i++]);
}
}
itemsAdapter = new LazyAdapter(myContext, myList);
但我得到一個錯誤: -
`E/AndroidRuntime(10276): Caused by: java.lang.IndexOutOfBoundsException: Invalid index 1, size is 1`
我該如何解決這個問題?
我仍然得到相同的錯誤 – user3534519