问题描述
我正在开发一个Android应用,并且已经使用Firebase实现了身份验证.登录后,在我的NavigationDrawerActivity
中,我有一个ListView
,我已经设置了FirebaseListAdapater
来获取用户特定的数据.
I am developing an Android app, and I have already implemented authentication with Firebase. After logging in, in my NavigationDrawerActivity
I have a ListView
that I had set a FirebaseListAdapater
to that gets user specific data.
在我的onCreate()
方法中,我有以下内容:
In my onCreate()
method I have the following:
firebaseAuth = FirebaseAuth.getInstance();
FirebaseUser localUser = firebaseAuth.getCurrentUser();
String localUserEmail = localUser.getEmail();
String localUserEmailUniqueID = getEmailAddressUniqueID(localUserEmail);
String dbUsersRoot = "https://DATABASENAME.firebaseio.com/Users/";
String dbUniqueRefForCurrentUser = dbUsersRoot + localUserEmailUniqueID +"/parishioners";
DatabaseReference databaseReferenceCurrentUser = FirebaseDatabase.getInstance().getReferenceFromUrl(dbUniqueRefForCurrentUser);
final FirebaseListAdapter<String> firebaseListAdapter = new FirebaseListAdapter<String>(
this,
String.class,
android.R.layout.simple_list_item_2,
databaseReferenceCurrentUser
) {
@Override
protected void populateView(View v, String model, int position) {
TextView textView = (TextView) v.findViewById(android.R.id.text1);
textView.setText(model);
}
};
mListView.setAdapter(firebaseListAdapter);
现在,在我的onStart()
方法中,我已经向按钮添加了setOnClickListener
,该按钮希望将新项目添加到列表中,如下所示:
Now, in my onStart()
method I have added an setOnClickListener
to a button that wishes to add a new item into my list , like this :
@Override
protected void onStart(){
super.onStart();
mButtonAdd.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
firebaseAuth = FirebaseAuth.getInstance();
FirebaseUser localUser = firebaseAuth.getCurrentUser();
String localUserEmail = localUser.getEmail();
String localUserEmailUniqueID = getEmailAddressUniqueID(localUserEmail);
String dbUsersRoot = "https://DATABASENAME.firebaseio.com/Users/";
String dbUniqueRefForCurrentUser = dbUsersRoot + localUserEmailUniqueID +"/parishioners";
DatabaseReference databaseReferenceCurrentUser = FirebaseDatabase.getInstance().getReferenceFromUrl(dbUniqueRefForCurrentUser);
databaseReferenceCurrentUser.push().setValue(editTextNewMember.getText().toString().trim());
}
});
}
单击添加"按钮后,我将在数据库中输入以下内容(假设EditText
中包含字符串"capuccino"):
On clicking the Add Button, I'll have in my database something like this (supposing the EditText
has in it the string 'capuccino'):
"luminittta" : {
"parishioners" : {
"-KX1GcEWPMy7oFWgt_3h" : "capuccino"
现在,我的列表将显示"capuccino"(因为它是实时数据库,因此我的列表将自动使用新添加的值进行更新).
Now, my List will show 'capuccino' (since it's a realtime database my list will automatically get updated with the newly added value).
我的问题是:接下来,我如何实现删除功能,当用户长时间单击ListView
中的某个项目时,该项目将被删除?
My question is:How can I implement next a delete functionality that when the user long clicks an item from the ListView
it gets removed?
整个数据库如下:
{
"Users" : {
"davidivanmircea" : {
"parishioners" : {
"-KX1FNcgSXgsMNz6QRIS" : "Gus Crick",
"-KX1FVIzzPM4nMrMvm9x" : "Florentino Williams",
"-KX1FZ27M-KS5TQZQ76u" : "Marc Raff",
"-KX1FbercKpPrl9r9tb4" : "Frederick Haddon",
"-KX1FgguOlRRN4sZKS8Z" : "Cristobal Wolfe",
"-KX1FkgwifQLIHplsZNx" : "Scott Nodal",
"-KX1Fp64Sa2QD94GR9uK" : "Odis Nevers",
"-KX1FrYK5PeuBucEiamY" : "Chauncey Mossman",
"-KX1FvIBDSrvppC3e4Ip" : "Alfonso Ignacio",
"-KX1Fy7dEHH8Z9JV-BRL" : "Douglas Hettinger",
"-KX1WdtbV4PEiscJV6E_" : "Daniel Muresan",
"-KX1WvYqekJZdWS6wGh6" : "Angelina Jolie"
}
},
"luminittta" : {
"parishioners" : {
"-KX1GYuSsgmHyGk5LQLA" : "mocha",
"-KX1G_Q130sWitNGzlAR" : "triplo",
"-KX1GaPIhuIyhV4vmLGe" : "latte",
"-KX1GcEWPMy7oFWgt_3h" : "capuccino",
"-KX1Gf7TKY3N8IQETig-" : "machiatto",
"-KX1Gh4KoYpcVpCDFI2x" : "cafe melange",
"-KX1GoCutX3XO-CRWWB3" : "ristretto",
"-KX1GpvdE5i9UR2ZaX0K" : "americano",
"-KX1Grb8S5QZu4HT9cuW" : "espresso"
}
}
}
}
非常感谢您的帮助!
PS:我已经在代码中用"DATABASENAME"修改了我的实际数据库名称.
PS: I have modified my actual database name with 'DATABASENAME' inside the code.
推荐答案
要删除LongClick上的特定项目,请在populateView中写入
To remove a specific item on LongClick write this in populateView
v.setOnLongClickListener(new View.OnLongClickListener() {
@Override
public boolean onLongClick(View view) {
getRef(position).removeValue();
notifyDataSetChanged();
return true;
}
});
这篇关于如何在与FirebaseListAdapter一起使用的ListView中删除当前选定的项目?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!