CODEWITHSUNDEEP
androidfirebasefirebase-realtime-databasefirebaseui
Tarlan Ahad
Tarlan Ahad

Reputation: 370

Android - Firebase searching with filtering

I'm developing an app that will help the user to search the books and download them which have been uploaded by other users as a form of the post.

In order to download the books first, the user should search them owing to attribute such as Title.

enter image description here

The posts which meet the requirement of the user should be displayed in the firebase-UI recyclerview.

This is my Firebase data structure:

enter image description here

I want the sample code that will create a Query which returns Id of convenient Posts such as ImgBRr2YFYfAu1WwENS1Ucj6jz13_1514813350760.

Please help me to solve the problem, any suggestions and ideas will be welcomed

Upvotes: 1

Views: 3024

Answers (2)

mark922
mark922

Reputation: 1167

Here is what you can do,

For search by language and then filter by title & author

public void search(String languangeSearchString, String title, String author){  
        FirebaseDatabase.getInstance().getReference().child("Posts").equalTo("language").startAt(languangeSearchString).addChildEventListener(new ChildEventListener() {
            @Override
            public void onChildAdded(DataSnapshot dataSnapshot, String s) {
                 String id = dataSnapshot.getKey();
                if(dataSnapshot.child("title").exists() && dataSnapshot.child("author").exists()){
                    if(dataSnapshot.child("title").getValue(String.class).equals(title) && dataSnapshot.child("author").getValue(String.class).equals(author)){
                        //Here are the results
                    }
                }           
            }

            @Override
            public void onChildChanged(DataSnapshot dataSnapshot, String s) {

            }

            @Override
            public void onChildRemoved(DataSnapshot dataSnapshot) {

            }

            @Override
            public void onChildMoved(DataSnapshot dataSnapshot, String s) {

            }

            @Override
            public void onCancelled(DatabaseError databaseError) {

            }
        });

}

Upvotes: 3

Aditya
Aditya

Reputation: 3673

To perform searching on firebase-database, we commonly use orderBy(). Like

firebaseDatabase.getReference("Posts").child("postId")
                        .orderBy("authorId")

But it can't possible to use multiple orderBy() like,

firebaseDatabase.getReference("Posts").child("postId")
                     .orderBy("authorId")
                     .orderBy("title")     // this will throw an error
                     .orderBy("language")

So you have to perform searching only on one child-node. For more info check this Query based on multiple where clauses in Firebase

Upvotes: 1

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