我有一个编辑文本。我正在观看每个字母处的文本更改,并为添加的每个字母查询查询Firebase的请求,从而为我添加了该字母的结果。因此,我尝试了以下提供的以下解决方案-
How to do a simple search in string in Firebase database?
,它似乎不起作用。
我的数据库中有以下JSON配置文件:
{
"002xUGm1uRXDYc8JpEy7AKFWFyy2" : {
"contest_uid" : "-LRoyQlTw5vo3CIE3tfb",
"created_at" : 1543726522,
"device_id" : "354020096008438",
"email" : "koushickroy321@gmail.com",
"is_suspended" : false,
"is_uploading" : false,
"last_login_at" : 1543726522,
"last_upload_started_at" : 0,
"name" : "gold rush eren patym cash patym",
"photoUrl" : "*"
},
"00IumwilishPwTgPUXX6GmveP5w2" : {
"contest_uid" : "-LRoyQlTw5vo3CIE3tfb",
"created_at" : 1543214441,
"device_id" : "865758030661505",
"email" : "khushyouheart@gmail.com",
"is_suspended" : false,
"is_uploading" : false,
"last_login_at" : 1543214441,
"last_upload_started_at" : 0,
"name" : "Khushal Chouhan",
"photoUrl" : "*"
},
"00TRPNqSi1R41F4SUuhHOgHBdkN2" : {
"contest_uid" : "-LO3Eg7zf1xh9RGDUy0e",
"created_at" : 1541355818,
"device_id" : "357149084088198",
"is_suspended" : false,
"is_uploading" : false,
"last_login_at" : 1541355818,
"last_upload_started_at" : 0,
"name" : "Gagan Singh Gaur",
"photoUrl" : "*"
},
这就是我已经尝试做的-
mExploreSearchEditText.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {
}
@Override
public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
}
@Override
public void afterTextChanged(Editable editable) {
if (editable.length() < 1) {
mExploreSearchRecommendedProfiles.setVisibility(View.VISIBLE);
fetchSixRandomProfiles();
} else {
mExploreSearchRecommendedProfiles.setVisibility(View.GONE);
fetchNewListFromEditable(editable);
}
}
});
}
private void fetchNewListFromEditable(Editable editable) {
String text = editable.toString();
Query query = FirebaseDatabase.getInstance().getReference().child("profiles").orderByChild("").startAt(text).endAt(text +"\uf8ff");
query.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
if (dataSnapshot.exists()) {
String users = dataSnapshot.getValue(String.class);
Timber.tag("similar users").d(users); // <-- I have never got to this point
} else {
Toast.makeText(App.getAppContext(), "snapshot does not exist", Toast.LENGTH_SHORT).show();
}
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
Timber.tag("similar users error - " + databaseError.getMessage());
}
});
}
我需要的是添加的每个字母,查询整个“配置文件”表,如果配置文件的名称从一开始就包含整个字符序列,那么我需要名称和photoURL。达到此结果的最佳方法是什么?
答案 0 :(得分:1)
类似这样的事情应该可以解决:
Query query = FirebaseDatabase.getInstance().getReference().child("profiles").orderByChild("name").startAt(text).endAt(text +"\uf8ff");
query.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
if (dataSnapshot.exists()) {
for (DataSnapshot snapshot: dataSnapshot.getChildren()) {
String users = snapshot.child("name").getValue(String.class);
Timber.tag("similar users").d(users);
}
} else {
Toast.makeText(App.getAppContext(), "snapshot does not exist", Toast.LENGTH_SHORT).show();
}
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
Timber.tag("similar users error - " + databaseError.getMessage());
}
})
更改:
orderByChild("name")
对name
属性值的配置文件进行排序/过滤。onDataChange
中循环遍历子级,因为查询可以有多个结果。snapshot.child("name").getValue(String.class)
我还没有做的事情:
notifyDataSetChanged()
。