| 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(); |
| } |
| } |