i am not getting my list view on the screen. following code is used for application.when i tried Log.v("abcd",dataSnapshot.toString()); replies me the object as string in logcat. i dont understand in which part i have problem. logcat is not showing any errors. but my screen remains blank.
FragmentLastView.class
package com.example.shiva.gconnection.extendedVersion;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import com.example.shiva.gconnection.R;
import com.example.shiva.gconnection.UploadingDetails;
import com.google.firebase.database.ChildEventListener;
import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import java.util.ArrayList;
import java.util.List;
public class FragmentLastView extends Fragment {
private FirebaseDatabase mdatabase;
private DatabaseReference mdbRef;
private ListView mItemLV;
private ChildEventListener childEventListener;
private ArrayAdapter mUploadItemAdapter;
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view= inflater.inflate(R.layout.uploaded_material,container,false);
mdatabase = FirebaseDatabase.getInstance();
mdbRef = mdatabase.getReference("College");
final String subjectName = getArguments().getString("SubjectName");
final String branchname = getArguments().getString("BranchName");
final String class1Name = getArguments().getString("Class1Name");
final String className = getArguments().getString("ClassName");
final ArrayList<UploadingDetails> uploadingDetails = new ArrayList<>();
mItemLV= (ListView)view.findViewById(R.id.lv_upload_item);
childEventListener = new ChildEventListener() {
@Override
public void onChildAdded(DataSnapshot dataSnapshot, String s) {
UploadingDetails updetails = dataSnapshot.getValue(UploadingDetails.class);
uploadingDetails.add(updetails);
}
@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) {}
};
if (uploadingDetails==null){
Log.v("abcd","this is null");
}
mdbRef.child(branchname).child(subjectName).child(className).child(class1Name).addChildEventListener(childEventListener);
mUploadItemAdapter = new UploadItemAdapter(getContext(),R.layout.uploaded_material_child,uploadingDetails);
mItemLV.setAdapter(mUploadItemAdapter);
return view;
}
}
UpdateItemAdapter.class
package com.example.shiva.gconnection.extendedVersion;
import android.app.Activity;
import android.content.Context;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;
import com.example.shiva.gconnection.R;
import com.example.shiva.gconnection.UploadingDetails;
import java.util.List;
/**
* Created by shiva on 3/3/18.
*/
public class UploadItemAdapter extends ArrayAdapter<UploadingDetails>{
public UploadItemAdapter( Context context, int resource, List<UploadingDetails> objects) {
super(context, resource, objects);
}
@Override
public View getView(int position ,View convertView,ViewGroup parent) {
if (convertView == null) {
convertView = ((Activity) getContext()).getLayoutInflater().inflate(R.layout.uploaded_material_child, parent, false);
}
TextView titalTV = (TextView) convertView.findViewById(R.id.title_item_upload_material);
TextView discriptionTV= (TextView) convertView.findViewById(R.id.discription_item_upload_material);
UploadingDetails uploadingDetails = getItem(position);
titalTV.setText(uploadingDetails.getTitle());
discriptionTV.setText(uploadingDetails.getDiscription());
return convertView;
}
}
uploaded_material.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_margin="10dp"
android:orientation="vertical">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="this is sample" />
<ListView
android:id="@+id/lv_upload_item"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:transcriptMode="alwaysScroll"
tools:listitem="@layout/uploaded_material_child" />
</LinearLayout>
uploaded_material_child.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:orientation="vertical"
android:layout_height="wrap_content">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Title"
android:id="@+id/title_item_upload_material"
android:textSize="20dp"
android:layout_margin="5dp"/>
<TextView
android:layout_margin="5dp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Discription"
android:id="@+id/discription_item_upload_material"
android:textSize="16dp" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="UploadedBy"
android:id="@+id/uploaded_by"
android:textSize="16dp"
android:layout_margin="5dp"/>
</LinearLayout>
UploadingDetails.class
package com.example.shiva.gconnection;
public class UploadingDetails {
private String mTitle;
private String mDiscription;
private String mArrayUri;
public UploadingDetails(){
}
public UploadingDetails(String title, String discription,String arrayUri){
this.mTitle= title;
this.mDiscription=discription;
this.mArrayUri=arrayUri;
}
public String getTitle(){
return this.mTitle;
}
public String getDiscription(){
return this.mDiscription;
}
public String getArrayUri(){return this.mArrayUri;}
}
