1. Android中如何从一个Activity中ArrayList<HashMap<String,Object>>传递到另一个activity？
eg：
存：intent.putExtra("arrayList", dataList);
取（记得强制类型转换）：
ArrayList<HashMap<String, Object>> dataList = new ArrayList<HashMap<String, Object>>();
dataList = (ArrayList<HashMap<String, Object>>) getIntent().getSerializableExtra("arrayList");
2. ArrayList<HashMap<String, Object>>如何更新键值对和删除键值对？
eg:
String[ ] name= new String[ ]{"张三","李四","王五","赵六","霍七"};
ArrayList<HashMap<String, Object>> arrayList = new ArrayList<HashMap<String, Object>>();
for( int i=0 ; i <name.length ; i++){
HashMap<String, Object> map = new HashMap<String, Object>();
map.put("Name", name[ i ]);
arrayList.add(map);
}
// 修改制定key
for (HashMap<String, Object> hashMap : arrayList)
{
if (hashMap.get("Name").equals("王五"))
{
hashMap.put("Name", "小明");
}
}
// 官方推荐的删除方法
Iterator<HashMap<String, Object>> iterator = arrayList.iterator();
while(iterator.hasNext())
{
if(iterator.next().get("Name").equals("李四"))
{
iterator.remove();
}
}
System.out.println(arrayList);
运行结果：
[{Name=张三}, {Name=小明}, {Name=赵六}, {Name=霍七}]
Map<String,Object> map1 = new HashMap<String,Object>();
map1.put("username",et_username.getText().toString().trim());
map1.put("password",et_password.getText().toString().trim());
Data.add(map1);
if(m!=null){
String username = m.get("username").toString().trim();
String password = m.get("password").toString().trim();
et_username.setText(username);
et_password.setText(password);
}else{
return;
}
}