Rasmus Rajje Josefsson Rasmus Rajje Josefsson - 6 months ago 368
Android Question

FirebaseRecyclerAdapter doesn't work for me

I need the parent key with it's child keys to represent a list of latitude and longitude in a RecyclerView. Guess I need to do something with the

LatLngsModel item
in the
populateViewHolder
inside the
FirebaseRecyclerAdapter
but no matter what I do I don't get it right.

I currently loops trough all the parent keys with it child keys as many parent keys it has, and adds it to the list...

The JSON structure:

{
"users" : {
"0057242b-81e2-4f97-bca7-b671212614ba" : {
"email" : "kalle@hotmail.se",
"waypoints" : {
"-KH9UAPH5NmLJExaUa5g" : {
"-KH9UAPH5NmLJExaS2s" : {
"latitude" : 111,
"longitude" : 111.1
}
},
"-KHB1VjqUdO90vxj9XCh" : {
"-KHB1VjqUdO90vxj9XCi" : {
"latitude" : 222.1,
"longitude" : 222.11
},
"-KHB1ZykbwgXM9sPNie9" : {
"latitude" : 222.2,
"longitude" : 222.22
}
}
}
},


UPDATED CODE

User

@JsonIgnoreProperties(ignoreUnknown=true)
public class User{

@JsonProperty("email")
String email;

MyWaypoint waypoints;

public User(){}

public User(String email){
this.email = email;
}

public String getEmail(){return this.email; }
public void setEmail(String _email){this.email = _email;}


public MyWaypoint getWaypoints(){return waypoints;}
public void setWaypoints(MyWaypoint points){ this.waypoints = points;}

}


Latitudes and longitudes POJO.

@JsonIgnoreProperties(ignoreUnknown = true)
public class MyWaypoint {

private double latitude;
private double longitude;

public MyWaypoint() {
}
public MyWaypoint(double latitude, double longitude) {
this.latitude = latitude;
this.longitude = longitude;
}

public double getLatitude() {
return latitude;
}
public double getLongitude() {
return longitude;
}
}


My Activity

public class MapListActivityRealBack2 extends AppCompatActivity {

private String LOG_TAG = "LOG_TAG";
private Firebase mRef;
private Firebase userRef;
private String mUserId;

FirebaseRecyclerAdapter<User, LatLngViewHolderBack2> mAdapter;


@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_list);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);


mRef = new Firebase(Constants.FIREBASE_URL);
if (mRef.getAuth() == null) {
loadLoginView();
}


try {
mUserId = mRef.getAuth().getUid();
} catch (Exception e) {
loadLoginView();
}


final RecyclerView mRecyclerView = (RecyclerView) findViewById(R.id.card_recycler_view);
mRecyclerView.setHasFixedSize(false);
LinearLayoutManager manager = new LinearLayoutManager(this);
manager.setReverseLayout(false);
mRecyclerView.setLayoutManager(manager);


// https://todoapprj.firebaseio.com/users/1a96a633-7e67-41b8-9aa7-c70d4b7eb59c
final String userUrl = Constants.FIREBASE_URL + "/users/" + mUserId;
userRef = new Firebase(userUrl);


mAdapter = new FirebaseRecyclerAdapter<User, LatLngViewHolderBack2>(User.class, R.layout.list_item, LatLngViewHolderBack2.class, userRef) {
@Override
protected void populateViewHolder(final LatLngViewHolderBack2 latLngViewHolder, User item, final int i) {




userRef.addValueEventListener(new ValueEventListener() {
List<MyWaypoint> userWayPointsList = new ArrayList<MyWaypoint>();

@Override
public void onDataChange(DataSnapshot wayPointsDataSnapshot) {
if(wayPointsDataSnapshot.getChildrenCount() > 0){
for (DataSnapshot wayPointsSnapshotChild : wayPointsDataSnapshot.getChildren()){
Log.i("FireBaseTester", "For-Loop :: wayPointsSnapshotChild.getValue() : "+wayPointsSnapshotChild.getValue());
if(wayPointsSnapshotChild.getChildrenCount()>0){

for (DataSnapshot wayPointsChild : wayPointsSnapshotChild.getChildren()){
//this is where we get the Lat and Lon
double latitude = Double.parseDouble(wayPointsChild.child("latitude").getValue().toString());
double longitude = Double.parseDouble(wayPointsChild.child("longitude").getValue().toString());
userWayPointsList.add(new MyWaypoint( latitude, longitude));
Log.i("FireBaseTester","latitude = "+latitude+" , longitude = "+longitude);
}
}

}
}
//here you can assign the points to the user
Log.i("FireBaseTester","There are "+userWayPointsList.size()+ " Points for User");
}

@Override
public void onCancelled(FirebaseError firebaseError) {
Log.e("FireBaseTester", "onCancelled - wayPointRef Error is " + firebaseError.getMessage());
}
});
}
};

mRecyclerView.setAdapter(mAdapter);

}



private void loadLoginView() {
Intent intent = new Intent(this, LoginActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(intent);
}
}



FATAL EXCEPTION: main
Process: com.example.rasmusjosefsson.rjcar, PID: 19134
com.firebase.client.FirebaseException: Failed to bounce to type
at com.firebase.client.DataSnapshot.getValue(DataSnapshot.java:185)
at
com.firebase.ui.FirebaseRecyclerAdapter.parseSnapshot(FirebaseRecyclerAdapter.java:161)
at
com.firebase.ui.FirebaseRecyclerAdapter.getItem(FirebaseRecyclerAdapter.java:150)
at
com.firebase.ui.FirebaseRecyclerAdapter.onBindViewHolder(FirebaseRecyclerAdapter.java:190)
at
android.support.v7.widget.RecyclerView$Adapter.onBindViewHolder(RecyclerView.java:5471)
at
android.support.v7.widget.RecyclerView$Adapter.bindViewHolder(RecyclerView.java:5504)
at
android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:4741)
at
android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:4617)
at
android.support.v7.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:1994)
at
android.support.v7.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1390)
at
android.support.v7.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1353)
at
android.support.v7.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:574)
at
android.support.v7.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:3028)
at
android.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:2906)
at
android.support.v7.widget.RecyclerView.onLayout(RecyclerView.java:3283)
at android.view.View.layout(View.java:16630)
at android.view.ViewGroup.layout(ViewGroup.java:5437)
at
android.support.design.widget.HeaderScrollingViewBehavior.layoutChild(HeaderScrollingViewBehavior.java:122)
at
android.support.design.widget.ViewOffsetBehavior.onLayoutChild(ViewOffsetBehavior.java:42)
at
android.support.design.widget.AppBarLayout$ScrollingViewBehavior.onLayoutChild(AppBarLayout.java:1170)
at
android.support.design.widget.CoordinatorLayout.onLayout(CoordinatorLayout.java:814)
at android.view.View.layout(View.java:16630)
at android.view.ViewGroup.layout(ViewGroup.java:5437)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:336)
at android.widget.FrameLayout.onLayout(FrameLayout.java:273)
at android.view.View.layout(View.java:16630)
at android.view.ViewGroup.layout(ViewGroup.java:5437)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1743)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1586)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1495)
at android.view.View.layout(View.java:16630)
at android.view.ViewGroup.layout(ViewGroup.java:5437)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:336)
at android.widget.FrameLayout.onLayout(FrameLayout.java:273)
at android.view.View.layout(View.java:16630)
at android.view.ViewGroup.layout(ViewGroup.java:5437)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1743)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1586)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1495)
at android.view.View.layout(View.java:16630)
at android.view.ViewGroup.layout(ViewGroup.java:5437)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:336)
at android.widget.FrameLayout.onLayout(FrameLayout.java:273)
at
com.android.internal.policy.PhoneWindow$DecorView.onLayout(PhoneWindow.java:2678)
at android.view.View.layout(View.java:16630)
at android.view.ViewGroup.layout(ViewGroup.java:5437)
at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2171)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1931)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1107)
at
android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6013)
at
android.view.Choreographer$CallbackRecord.run(Choreographer.java:858)
at android.view.Choreographer.doCallbacks(Choreographer.java:670)
at android.view.Choreographer.doFrame(Choreographer.java:606)
at
android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:844)
at android.os.H

Answer

The solution I found to work, was using List<List<String>> that retrieves waypoints from the onDataChange() and puts them into the nested list.

This nested list is later used in the recyclerView where each list from the nested list represent a "View item" in my recyclerView

    private Firebase mRef;
    private Firebase mUserRef;
    private String mUserId;
    List<List<String>> latitudeNlongitude = new ArrayList<>();


    //  FirebaseRecyclerAdapter<MyLatLng123, LatLngViewHolderBack2> mAdapter;
    FirebaseRecyclerAdapter<MyWaypoint, LatLngViewHolderBack2> mAdapter;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_list);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);


        mRef = new Firebase(Constants.FIREBASE_URL);
        if (mRef.getAuth() == null) {
            loadLoginView();
        }


        try {
            mUserId = mRef.getAuth().getUid();
        } catch (Exception e) {
            loadLoginView();
        }


        final RecyclerView mRecyclerView = (RecyclerView) findViewById(R.id.card_recycler_view);
        mRecyclerView.setHasFixedSize(false);
        LinearLayoutManager manager = new LinearLayoutManager(this);
        manager.setReverseLayout(false);
        mRecyclerView.setLayoutManager(manager);


        // https://todoapprj.firebaseio.com/users/1a96a633-7e67-41b8-9aa7-c70d4b7eb59c/waypoints
        final String userUrl = Constants.FIREBASE_URL + "/users/" + mUserId + "/waypoints";
        mUserRef = new Firebase(userUrl);


        if (mUserRef != null) {
            mUserRef.addValueEventListener(new ValueEventListener() {
                //this keeps per-user list of points
                List<MyWaypoint> userWayPointsList = new ArrayList<MyWaypoint>();

                @Override
                public void onDataChange(DataSnapshot wayPointsDataSnapshot) {
                    if (wayPointsDataSnapshot.getChildrenCount() > 0) {


                        for (DataSnapshot wayPointsSnapshotChild : wayPointsDataSnapshot.getChildren()) {
                            Log.i("FireBaseTester", "For-Loop :: wayPointsSnapshotChild.getValue() : " + wayPointsSnapshotChild.getValue());
                            if (wayPointsSnapshotChild.getChildrenCount() > 0) {


                                // Temporary list
                                List<String> latLngListTemp = new ArrayList<>();


                                for (DataSnapshot wayPointsChild : wayPointsSnapshotChild.getChildren()) {

                                    //this is where we get the Lat and Lon
                                    double latitude = Double.parseDouble(wayPointsChild.child("latitude").getValue().toString());
                                    double longitude = Double.parseDouble(wayPointsChild.child("longitude").getValue().toString());
                                    Log.i("FireBaseTester", "latitude = " + latitude + " , longitude = " + longitude);

                                    latLngListTemp.add(latitude + ", " + longitude);


                                }

                                // List containing a nested List<List<String>>
                                latitudeNlongitude.add(latLngListTemp);
                            }

                        }

                    }

                    //here you can assign the points to the user
                    Log.i("FireBaseTester", "There are " + userWayPointsList.size() + " Points for User");
                }

                @Override
                public void onCancelled(FirebaseError firebaseError) {
                    Log.e("FireBaseTester", "onCancelled - wayPointRef Error is " + firebaseError.getMessage());
                }
            });
        } else {
            Log.i("FireBaseTester", "No WayPoints Data Received");
        }


        mAdapter = new FirebaseRecyclerAdapter<MyWaypoint, LatLngViewHolderBack2>(MyWaypoint.class, R.layout.list_item, LatLngViewHolderBack2.class, mUserRef) {
            @Override
            protected void populateViewHolder(final LatLngViewHolderBack2 latLngViewHolder, MyWaypoint item, final int i) {




                // Reterives a List from the position (i) of the nested list at onDataChange --- > List<List<String>> latitudeNlongitude
                List<String> latlngListIterator = latitudeNlongitude.get(i);

                // New Empty list for each iteration
                List<String> latLngListTemporary  = new ArrayList<>();

                // Adding items to a new empty list for use in next method with googles api.
                for (String value : latlngListIterator) {
                    latLngListTemporary.add(value);
                }

                // Getting the start location and the endlocation
                String startLatLng = latLngListTemporary.get(0);
                String endLatLng = latLngListTemporary.get(latLngListTemporary .size() - 1);


                // Reterives the information from googles API in JSON and turns them into POJOS
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