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@EdenStack
Created August 29, 2016 04:32
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Recyclerview with emptyview
package com.tneciv.blueprint.widget;
import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.util.AttributeSet;
import android.view.View;
/**
* Created by Tneciv
* on 2016-08-20 01:13 .
* https://github.com/googlesamples/android-XYZTouristAttractions/blob/master/Application/src/main/java/com/example/android/xyztouristattractions/ui/AttractionsRecyclerView.java
*/
public class BluePrintRecyclerView extends RecyclerView {
private View mEmptyView;
private AdapterDataObserver mDataObserver = new AdapterDataObserver() {
@Override
public void onChanged() {
super.onChanged();
updateEmptyView();
}
};
public BluePrintRecyclerView(Context context) {
super(context);
}
public BluePrintRecyclerView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public BluePrintRecyclerView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
/**
* Designate a view as the empty view. When the backing adapter has no
* data this view will be made visible and the recycler view hidden.
*/
public void setEmptyView(View emptyView) {
mEmptyView = emptyView;
}
@Override
public void setAdapter(RecyclerView.Adapter adapter) {
if (getAdapter() != null) {
getAdapter().unregisterAdapterDataObserver(mDataObserver);
}
if (adapter != null) {
adapter.registerAdapterDataObserver(mDataObserver);
}
super.setAdapter(adapter);
updateEmptyView();
}
private void updateEmptyView() {
if (mEmptyView != null && getAdapter() != null) {
boolean showEmptyView = getAdapter().getItemCount() == 0;
mEmptyView.setVisibility(showEmptyView ? VISIBLE : GONE);
setVisibility(showEmptyView ? GONE : VISIBLE);
}
}
}
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