W/ClassMapper: No setter/field for class

Question

I\'m simply just trying to populate data from Firebase Database into my recyclerview. My recyclerview shows perfectly, but the adapter won\'t set the values to the text in recyc

Answer 1

Even if I don't see your database structure, I can say from your code that your asking for everything under Street Problems, which includes all of the objects you pushed previously. I can see from the error message that it's trying to find a setter or field for the push ID -L57t4-97c3dLZjA_yXC that it found just under Street Problems node. If you want to get a single object, you're going to have to dig into the objects in the push IDs under Street Problems. Your code should look something like this:

dataSnapshot.child("Street Problems/-L57t4-97c3dLZjA_yXC").getValue(StreetClass.class);

If you want all StreetClass objects, then simply loop through its childrens like this:

DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference();
DatabaseReference yourRef = rootRef.child("Street Problems");
ValueEventListener eventListener = new ValueEventListener() {
    @Override
    public void onDataChange(DataSnapshot dataSnapshot) {
        for(DataSnapshot ds : dataSnapshot.getChildren()) {
            for(DataSnapshot dSnapshot : ds.getChildren()) {
                StreetClass streetClass = dSnapshot.getValue(StreetClass.class);
                Log.d("TAG", streetClass.getName());
            }
        }
    }

    @Override
    public void onCancelled(DatabaseError databaseError) {}
};
yourRef.addListenerForSingleValueEvent(eventListener);

This is an example on how to display the names using getName() method.

Edit:

As i see on your updatedquestion, the warning is because the casing mismatches between your field and you setter.

You have a field named and the corresponding setters and getters which are not correct!

private String sname;

public String getName() {
    return sname;
}

public void setName(String name) {
    this.sname = name;
}

The correct setters and getters should be:

public String getSname() {
    return sname;
}

public void setSname(String name) {
    this.sname = name;
}

The same problems is also with the other fields.

This is the correct way of structuring your model class:

public class StreetClass {
    private String id;
    private String semail;
    private String sname;
    private String stype;
    private String sdetail;
    private String slocation;
    private String sdate;
    private String imgurl;

    public StreetClass(){}

    public StreetClass(String id, String semail, String sname, String stype, String sdetail, String slocation, String sdate, String imgurl) {
        this.id = id;
        this.semail = semail;
        this.sname = sname;
        this.stype = stype;
        this.sdetail = sdetail;
        this.slocation = slocation;
        this.sdate = sdate;
        this.imgurl = imgurl;
    }

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getSemail() {
        return semail;
    }

    public void setSemail(String semail) {
        this.semail = semail;
    }

    public String getSname() {
        return sname;
    }

    public void setSname(String sname) {
        this.sname = sname;
    }

    public String getStype() {
        return stype;
    }

    public void setStype(String stype) {
        this.stype = stype;
    }

    public String getSdetail() {
        return sdetail;
    }

    public void setSdetail(String sdetail) {
        this.sdetail = sdetail;
    }

    public String getSlocation() {
        return slocation;
    }

    public void setSlocation(String slocation) {
        this.slocation = slocation;
    }

    public String getSdate() {
        return sdate;
    }

    public void setSdate(String sdate) {
        this.sdate = sdate;
    }

    public String getImgurl() {
        return imgurl;
    }

    public void setImgurl(String imgurl) {
        this.imgurl = imgurl;
    }
}

You can also use the String class as below:

DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference();
DatabaseReference yourRef = rootRef.child("Street Problems");
ValueEventListener eventListener = new ValueEventListener() {
    @Override
    public void onDataChange(DataSnapshot dataSnapshot) {
        for(DataSnapshot ds : dataSnapshot.getChildren()) {
            for(DataSnapshot dSnapshot : ds.getChildren()) {
                String sname = dSnapshot.child("sname").getValue(String.class);
                Log.d("TAG", sname);
            }
        }
    }

    @Override
    public void onCancelled(DatabaseError databaseError) {}
};
yourRef.addListenerForSingleValueEvent(eventListener);