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/******************************************************************************* * Copyright (c) 2014 Michal Dabski//from w w w. ja v a 2s .c om * * Permission is hereby granted, free of charge, to any person obtaining a copy of * this software and associated documentation files (the "Software"), to deal in * the Software without restriction, including without limitation the rights to * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of * the Software, and to permit persons to whom the Software is furnished to do so, * subject to the following conditions: * * The above copyright notice and this permission notice shall be included in all * copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. ******************************************************************************/ package com.michaldabski.utils; import android.util.SparseArray; import android.view.View; public class ViewHolder { final View root; final SparseArray<View> views = new SparseArray<View>(3); public ViewHolder(View root) { this.root = root; } @SuppressWarnings("unchecked") public <T extends View> T getViewById(int id) { T view = (T) views.get(id); if (view == null) { views.put(id, (view = (T) root.findViewById(id))); if (view == null) throw new NullPointerException("Cannot find requested view id "+String.valueOf(id)); } return view; } public boolean hasView(int id) { if (views.get(id) != null) return true; else { View view = this.root.findViewById(id); if (view == null) return false; else { views.put(id, view); return true; } } } }