A visualização Recycler não preenche nenhum dado na minha tela
Minha atividade principal mostra um espaço vazioRecyclerView. MinhasCardView não é exibido.
Os dados são armazenados em um banco de dados Firebase, mas não são exibidos por algum motivo.
Também procurei na web, mas nada me ajudou. Eu tentei de tudo listado na web, bem como no Stack Overflow.
MainActivity.java
public class MainActivity1 extends AppCompatActivity {
private RecyclerView mQuestionList;
private CardView mCardVieww;
private DatabaseReference mDatabase;
private FirebaseAuth mAuth;
private FirebaseAuth.AuthStateListener mAuthListener;
private DatabaseReference mDatabaseUsers;
private LinearLayoutManager layoutManager;
private DatabaseReference mDatabaseCurrentUsers;
private DatabaseReference mDatabaseLike;
private boolean mProcessLike = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main1);
mAuth=FirebaseAuth.getInstance();
mAuthListener=new FirebaseAuth.AuthStateListener() {
@Override
public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
if (firebaseAuth.getCurrentUser()== null){
Intent loginIntent=new Intent(MainActivity1.this,LoginActivity.class);
loginIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(loginIntent);
}
}
};
mDatabase= FirebaseDatabase.getInstance().getReference().child("Question");
mDatabaseUsers=FirebaseDatabase.getInstance().getReference().child("Users");
mDatabaseLike=FirebaseDatabase.getInstance().getReference().child("Likes");
mDatabaseUsers.keepSynced(true);
mDatabaseLike.keepSynced(true);
mDatabase.keepSynced(true);
mQuestionList=(RecyclerView) findViewById(R.id.question_list);
layoutManager=new LinearLayoutManager(this);
layoutManager.setReverseLayout(true);
layoutManager.setStackFromEnd(true);
mQuestionList.setHasFixedSize(true);
mQuestionList.setLayoutManager(layoutManager);
checkUserExist();
}
@Override
protected void onStart() {
super.onStart();
mAuth.addAuthStateListener(mAuthListener);
FirebaseRecyclerAdapter <Question,QuestionViewHolder> fireRecyclerAdapter = new FirebaseRecyclerAdapter <Question,QuestionViewHolder>(
Question.class,
R.layout.question,
QuestionViewHolder.class,
mDatabase
){
@Override
protected void populateViewHolder(QuestionViewHolder viewHolder,Question model, int position){
final String post_key = getRef(position).getKey()
viewHolder.setTitle(model.getTitle());
viewHolder.setDesc(model.getDesc());
viewHolder.setImage(getApplicationContext(),model.getImage());
viewHolder.setUsername(model.getUsername());
viewHolder.setLikeBtn(post_key);
viewHolder.mView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// Toast.makeText(MainActivity1.this,post_key,Toast.LENGTH_LONG).show();
Intent singleQuestionIntent=new Intent(MainActivity1.this,QuestionSingleActivity.class);
singleQuestionIntent.putExtra("question_id",post_key);
startActivity(singleQuestionIntent);
}
});
viewHolder.mLikeBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mProcessLike = true;
mDatabaseLike.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
if (mProcessLike) {
if (dataSnapshot.child(post_key).hasChild(mAuth.getCurrentUser().getUid())) {
mDatabaseLike.child(post_key).child(mAuth.getCurrentUser().getUid()).removeValue();
mProcessLike = false;
} else {
mDatabaseLike.child(post_key).child(mAuth.getCurrentUser().getUid()).setValue("RandomValue");
mProcessLike = false;
}
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
});
}
};
mQuestionList.setHasFixedSize(true);
mQuestionList.setLayoutManager(layoutManager);
mQuestionList.setAdapter(fireRecyclerAdapter);
}
//cgeck user exist or not
private void checkUserExist() {
if (mAuth.getCurrentUser() != null) {
final String user_id = mAuth.getCurrentUser().getUid();
mDatabaseUsers.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
if (!dataSnapshot.hasChild(user_id)) {
Intent setupIntent = new Intent(MainActivity1.this, SetupActivity.class);
setupIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(setupIntent);
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
}
public static class QuestionViewHolder extends RecyclerView.ViewHolder{
View mView;
ImageButton mLikeBtn;
DatabaseReference mDatabaseLike;
FirebaseAuth mAuth;
public QuestionViewHolder(View itemView) {
super(itemView);
mView=itemView;
mLikeBtn=(ImageButton) mView.findViewById(R.id.likeBtn);
mDatabaseLike= FirebaseDatabase.getInstance().getReference().child("Likes");
mAuth=FirebaseAuth.getInstance();
mDatabaseLike.keepSynced(true);
}
public void setLikeBtn(final String post_key){
mDatabaseLike.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
if (dataSnapshot.child(post_key).hasChild(mAuth.getCurrentUser().getUid())){
mLikeBtn.setImageResource(R.mipmap.thumb_grey);
}else{
mLikeBtn.setImageResource(R.mipmap.thumb_grey);
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
public void setTitle(String title){
TextView post_title=(TextView) mView.findViewById(R.id.post_title);
post_title.setText(title);
}
public void setDesc(String desc){
TextView post_desc=(TextView) mView.findViewById(R.id.post_desc);
post_desc.setText(desc);
}
public void setUsername(String username){
TextView post_username=(TextView) mView.findViewById(R.id.post_username);
post_username.setText(username);
}
public void setImage(final Context ctx, final String image){
final ImageView post_image=(ImageView) mView.findViewById(R.id.post_image);
//Picasso.with(ctx).load(image).into(post_image);
Picasso.with(ctx).load(image).networkPolicy(NetworkPolicy.OFFLINE).into(post_image, new Callback() {
@Override
public void onSuccess() {
}
@Override
public void onError() {
Picasso.with(ctx).load(image).into(post_image);
}
});
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main_menu,menu);
return super.onCreateOptionsMenu(menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if(item.getItemId()==R.id.action_add){
startActivity(new Intent(MainActivity1.this,PostActivity.class));
}
if(item.getItemId()==R.id.action_logout){
logout();
}
if(item.getItemId()==R.id.action_Qp){
startActivity(new Intent(MainActivity1.this,MainActivity2.class));
}
return super.onOptionsItemSelected(item);
}
private void logout() {
mAuth.signOut();
}
}
Question.java
public class Question {
private CardView mCardView;
private String title;
private String desc;
private String image;
private String username;
public Question(){
}
public Question(String title, String desc, String image,String username) {
this.title = title;
this.desc = desc;
this.image = image;
this.username = username;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getDesc() {
return desc;
}
public void setDesc(String desc) {
this.desc = desc;
}
public String getImage() {
return image;
}
public void setImage(String image) {
this.image = image;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
}
activity_main1.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"
tools:context="com.example.akhil.rtmnuforum.MainActivity1">
<android.support.v7.widget.RecyclerView
android:id="@+id/question_list"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/background">
</android.support.v7.widget.RecyclerView>
</LinearLayout>
question.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/cardview"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="20dp"
android:visibility="visible"
tools:context="com.example.akhil.rtmnuforum.MainActivity1">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<ImageView
android:id="@+id/post_image"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:adjustViewBounds="true"
android:scaleType="centerCrop"
android:src="@mipmap/add_btn" />
<TextView
android:id="@+id/post_title"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="15dp"
android:text="Post Title Goes here"
android:textSize="16dp"
android:textStyle="bold" />
<TextView
android:id="@+id/post_desc"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingBottom="15dp"
android:paddingLeft="15dp"
android:paddingRight="15dp"
android:text="Question Description Goes here" />
<TextView
android:id="@+id/post_username"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingBottom="15dp"
android:paddingLeft="15dp"
android:paddingRight="15dp"
android:text="username"
android:textSize="12dp"
android:textStyle="bold" />
<ImageButton
android:id="@+id/likeBtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="10dp"
android:background="@color/cardview_light_background"
app:srcCompat="@mipmap/ic_thumb_up_black_24dp" />
</LinearLayout>
</android.support.v7.widget.CardView>