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package com.android.tv.util;
import android.content.Context;
import android.util.SparseArray;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import java.util.ArrayList;
/**
* A cache for the views.
*/
public class ViewCache {
private final static SparseArray<ArrayList<View>> mViews = new SparseArray();
private static ViewCache sViewCache;
private ViewCache() { }
/**
* Returns an instance of the view cache.
*/
public static ViewCache getInstance() {
if (sViewCache == null) {
sViewCache = new ViewCache();
}
return sViewCache;
}
/**
* Returns if the view cache is empty.
*/
public boolean isEmpty() {
return mViews.size() == 0;
}
/**
* Stores a view into this view cache.
*/
public void putView(int resId, View view) {
ArrayList<View> views = mViews.get(resId);
if (views == null) {
views = new ArrayList();
mViews.put(resId, views);
}
views.add(view);
}
/**
* Stores multi specific views into the view cache.
*/
public void putView(Context context, int resId, ViewGroup fakeParent, int num) {
LayoutInflater inflater =
(LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
ArrayList<View> views = mViews.get(resId);
if (views == null) {
views = new ArrayList<>();
mViews.put(resId, views);
}
for (int i = 0; i < num; i++) {
View view = inflater.inflate(resId, fakeParent, false);
views.add(view);
}
}
/**
* Returns the view for specific resource id.
*/
public View getView(int resId) {
ArrayList<View> views = mViews.get(resId);
if (views != null && !views.isEmpty()) {
View view = views.remove(views.size() - 1);
if (views.isEmpty()) {
mViews.remove(resId);
}
return view;
} else {
return null;
}
}
/**
* Returns the view if exists, or create a new view for the specific resource id.
*/
public View getOrCreateView(LayoutInflater inflater, int resId, ViewGroup container) {
View view = getView(resId);
if (view == null) {
view = inflater.inflate(resId, container, false);
}
return view;
}
/**
* Clears the view cache.
*/
public void clear() {
mViews.clear();
}
}
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