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How to setEmptyView to RecyclerView - tutorial (http://alexzh.com/tutorials/how-to-setemptyview-to-recyclerview/)
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.alexzh.recyclerviewsetemptyview.EmptyRecyclerView
android:id="@+id/recycler_view"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
<TextView
android:id="@+id/empty_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:text="Add more notes"
android:textSize="36sp" />
</RelativeLayout>
package com.alexzh.recyclerviewsetemptyview;
import android.content.Context;
import android.support.annotation.Nullable;
import android.support.v7.widget.RecyclerView;
import android.util.AttributeSet;
import android.view.View;
public class EmptyRecyclerView extends RecyclerView {
private View mEmptyView;
public EmptyRecyclerView(Context context) {
super(context);
}
public EmptyRecyclerView(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
}
public EmptyRecyclerView(Context context, @Nullable AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
private void initEmptyView() {
if (mEmptyView != null) {
mEmptyView.setVisibility(
getAdapter() == null || getAdapter().getItemCount() == 0 ? VISIBLE : GONE);
EmptyRecyclerView.this.setVisibility(
getAdapter() == null || getAdapter().getItemCount() == 0 ? GONE : VISIBLE);
}
}
final AdapterDataObserver observer = new AdapterDataObserver() {
@Override
public void onChanged() {
super.onChanged();
initEmptyView();
}
@Override
public void onItemRangeInserted(int positionStart, int itemCount) {
super.onItemRangeInserted(positionStart, itemCount);
initEmptyView();
}
@Override
public void onItemRangeRemoved(int positionStart, int itemCount) {
super.onItemRangeRemoved(positionStart, itemCount);
initEmptyView();
}
};
@Override
public void setAdapter(Adapter adapter) {
Adapter oldAdapter = getAdapter();
super.setAdapter(adapter);
if (oldAdapter != null) {
oldAdapter.unregisterAdapterDataObserver(observer);
}
if (adapter != null) {
adapter.registerAdapterDataObserver(observer);
}
}
public void setEmptyView(View view) {
this.mEmptyView = view;
initEmptyView();
}
}
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="@+id/title_text_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="12dp"
android:layout_marginRight="12dp"
android:layout_marginTop="8dp"
android:layout_marginBottom="8dp"
android:textSize="24sp"/>
</FrameLayout>
package com.alexzh.recyclerviewsetemptyview;
import android.os.Handler;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.DefaultItemAnimator;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity {
private final static int DELAY = 3000;
private Handler mHandler;
private NotesAdapter mAdapter;
private Runnable updateAdapterRunnable = new Runnable() {
@Override
public void run() {
mAdapter.setNotes(getTmpNotes());
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mAdapter = new NotesAdapter();
EmptyRecyclerView recyclerView = (EmptyRecyclerView) findViewById(R.id.recycler_view);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
recyclerView.setItemAnimator(new DefaultItemAnimator());
recyclerView.setEmptyView(findViewById(R.id.empty_view));
recyclerView.setAdapter(mAdapter);
mHandler = new Handler();
}
@Override
protected void onResume() {
super.onResume();
mHandler.postDelayed(updateAdapterRunnable, DELAY);
}
@Override
protected void onPause() {
super.onPause();
mHandler.removeCallbacks(updateAdapterRunnable);
}
private static List<Note> getTmpNotes() {
final List<Note> list = new ArrayList<>();
list.add(new Note("1st note"));
list.add(new Note("2nd note"));
list.add(new Note("3rd note"));
list.add(new Note("4th note"));
list.add(new Note("5th note"));
list.add(new Note("6th note"));
list.add(new Note("7th note"));
list.add(new Note("8th note"));
list.add(new Note("9th note"));
list.add(new Note("10th note"));
list.add(new Note("11th note"));
list.add(new Note("12th note"));
list.add(new Note("13th note"));
list.add(new Note("15th note"));
return list;
}
}
package com.alexzh.recyclerviewsetemptyview;
public class Note {
private String mTitle;
public Note(String title) {
this.mTitle = title;
}
public String getTitle() {
return mTitle;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
Note note = (Note) o;
return mTitle != null ? mTitle.equals(note.mTitle) : note.mTitle == null;
}
@Override
public int hashCode() {
return mTitle != null ? mTitle.hashCode() : 0;
}
@Override
public String toString() {
return "Note{" +
"title='" + mTitle + '\'' +
'}';
}
}
package com.alexzh.recyclerviewsetemptyview;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import java.util.List;
public class NotesAdapter extends EmptyRecyclerView.Adapter<NoteViewHolder> {
private List<Note> mNotes;
public void setNotes(List<Note> notes) {
this.mNotes = notes;
notifyDataSetChanged();
}
@Override
public NoteViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(parent.getContext())
.inflate(R.layout.item_note, parent, false);
return new NoteViewHolder(itemView);
}
@Override
public void onBindViewHolder(NoteViewHolder holder, int position) {
holder.mTitleTextView.setText(mNotes.get(position).getTitle());
}
@Override
public int getItemCount() {
return mNotes == null ? 0 : mNotes.size();
}
}
package com.alexzh.recyclerviewsetemptyview;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.widget.TextView;
class NoteViewHolder extends RecyclerView.ViewHolder {
protected TextView mTitleTextView;
NoteViewHolder(View itemView) {
super(itemView);
mTitleTextView = (TextView) itemView.findViewById(R.id.title_text_view);
}
}
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