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@henningta
Forked from meoyawn/EmptyRecyclerView.java
Last active September 3, 2015 14:57
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import android.content.Context;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v7.widget.RecyclerView;
import android.util.AttributeSet;
import android.view.View;
public class EmptyRecyclerView extends RecyclerView {
@Nullable
private View emptyView;
public EmptyRecyclerView(Context context) {
super(context);
}
public EmptyRecyclerView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public EmptyRecyclerView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
@Override
public void setAdapter(@Nullable Adapter adapter) {
final Adapter oldAdapter = getAdapter();
if (oldAdapter != null) {
oldAdapter.unregisterAdapterDataObserver(observer);
}
if (adapter != null) {
adapter.registerAdapterDataObserver(observer);
}
super.setAdapter(adapter);
checkIfEmpty();
}
@NonNull
private final AdapterDataObserver observer = new AdapterDataObserver() {
@Override
public void onChanged() {
super.onChanged();
checkIfEmpty();
}
@Override
public void onItemRangeInserted(int positionStart, int itemCount) {
super.onItemRangeInserted(positionStart, itemCount);
checkIfEmpty();
}
@Override
public void onItemRangeRemoved(int positionStart, int itemCount) {
super.onItemRangeRemoved(positionStart, itemCount);
checkIfEmpty();
}
};
/**
* Indicates the view to be shown when the adapter for this object is empty
*
* @param emptyView
*/
public void setEmptyView(@Nullable View emptyView) {
if (this.emptyView != null) {
this.emptyView.setVisibility(GONE);
}
this.emptyView = emptyView;
checkIfEmpty();
}
/**
* Check adapter item count and toggle visibility of empty view if the adapter is empty
*/
private void checkIfEmpty() {
if (emptyView == null || getAdapter() == null) {
return;
}
if (getAdapter().getItemCount() > 0) {
emptyView.setVisibility(GONE);
} else {
emptyView.setVisibility(VISIBLE);
}
}
}
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