Java tutorial
/* * The MIT License (MIT) * * Copyright (c) 2014-2015 Umeng, Inc * * 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.pikachu.emoji.widget; import java.util.ArrayList; import java.util.List; import android.content.Context; import android.graphics.Color; import android.support.v4.view.PagerAdapter; import android.support.v4.view.ViewPager; import android.support.v4.view.ViewPager.OnPageChangeListener; import android.util.AttributeSet; import android.view.Gravity; import android.view.View; import android.view.ViewGroup; import android.widget.ImageView; import android.widget.LinearLayout; import com.pikachu.emoji.EmojiBean; import com.pikachu.emoji.EmojiSource; import com.pikachu.emoji.utils.CommonUtils; import com.pikachu.emoji.utils.ResFinder; /** * Emoji borad */ public class EmojiView extends LinearLayout implements OnPageChangeListener { private static final int PAGE_SIZE = 20; // size of page public static final String DELETE_KEY = "delete"; private static int BOARD_HEIGHT = 400; // height of emoji board private EmojiPagerAdapter mAdapter = null; private List<ImageView> mIndicators = new ArrayList<ImageView>(); private int mLastSelectViewPos = 0; // ?? private String mNormalIcon = "emoji_indicator_normal"; // icon private String mSelectIcon = "emoji_indicator_selected";// icon /** * @param context */ public EmojiView(Context context) { super(context); init(); } /** * @param context * @param attrs */ public EmojiView(Context context, AttributeSet attrs) { super(context, attrs); init(); } /** * @param context * @param attrs * @param defStyle */ public EmojiView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); init(); } private void computeBoardHeight() { BOARD_HEIGHT = CommonUtils.dp2px(getContext(), 140); } /** * init. Set params and add show emoji views</br> */ @SuppressWarnings("deprecation") private void init() { computeBoardHeight(); setOrientation(LinearLayout.VERTICAL); setBackgroundColor(Color.parseColor("#f4f4f6")); ViewPager viewPager = createVIewpager(); addView(viewPager); ViewGroup container = createPointLinearlayout(); List<EmojiPage> datas = new ArrayList<EmojiPage>(); int lens = EmojiSource.DATA.length; int pages = lens / PAGE_SIZE; // pages? for (int i = 0; i < pages; i++) { EmojiBean[] blocks = new EmojiBean[PAGE_SIZE + 1]; System.arraycopy(EmojiSource.DATA, i * PAGE_SIZE, blocks, 0, blocks.length - 1); blocks[PAGE_SIZE] = EmojiBean.fromChars(DELETE_KEY); datas.add(new EmojiPage(getContext(), blocks)); // the last is // delete icon } // add remain emoji view if (pages * PAGE_SIZE < lens) { EmojiBean[] blocks = new EmojiBean[lens - pages * PAGE_SIZE]; System.arraycopy(EmojiSource.DATA, pages * PAGE_SIZE, blocks, 0, blocks.length); datas.add(new EmojiPage(getContext(), blocks)); } // add indicator for (int i = 0; i < datas.size(); i++) { ImageView indicatorView = createIndicator(); mIndicators.add(indicatorView); container.addView(indicatorView); } addView(container); // set cache view count viewPager.setOffscreenPageLimit(datas.size()); // mIndicators.get(mLastSelectViewPos).setImageDrawable(ResFinder.getDrawable(mSelectIcon)); mAdapter = new EmojiPagerAdapter(getContext(), datas); viewPager.setAdapter(mAdapter); viewPager.setOnPageChangeListener(this); } public void setOnEmojiItemClickListener(OnEmojiItemClickListener listener) { List<EmojiPage> views = mAdapter.getDataSource(); for (EmojiPage view : views) { view.setOnItemClickListener(listener); } } /** * ?</br> * * @return */ private ImageView createIndicator() { ImageView imageView = new ImageView(getContext()); LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(30, 30); params.gravity = Gravity.CENTER; imageView.setLayoutParams(params); imageView.setImageDrawable(ResFinder.getDrawable(mNormalIcon)); imageView.setPadding(0, 0, 10, 0); return imageView; } /** * </br> * * @return */ private ViewGroup createPointLinearlayout() { LinearLayout pointContainerLayout = new LinearLayout(getContext()); LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); pointContainerLayout.setLayoutParams(params); pointContainerLayout.setOrientation(LinearLayout.HORIZONTAL); pointContainerLayout.setGravity(Gravity.CENTER); params.gravity = Gravity.CENTER; params.topMargin = CommonUtils.dp2px(getContext(), 15); params.bottomMargin = CommonUtils.dp2px(getContext(), 15); return pointContainerLayout; } /** * create ViewPager view</br> * * @return */ private ViewPager createVIewpager() { ViewPager viewPager = new ViewPager(getContext()); ViewPager.LayoutParams params = new ViewPager.LayoutParams(); params.width = android.support.v4.view.ViewPager.LayoutParams.MATCH_PARENT; params.height = BOARD_HEIGHT; viewPager.setLayoutParams(params); viewPager.setPadding(0, 15, 0, 0); return viewPager; } /** * ViewPager Adapter */ private class EmojiPagerAdapter extends PagerAdapter { private List<EmojiPage> mViews = new ArrayList<EmojiPage>(); public EmojiPagerAdapter(Context context, List<EmojiPage> views) { mViews.addAll(views); } @Override public int getCount() { return mViews.size(); } @Override public boolean isViewFromObject(View view, Object object) { return view == object; } @Override public Object instantiateItem(ViewGroup container, int position) { container.addView(mViews.get(position), position); return mViews.get(position); } @Override public void destroyItem(ViewGroup container, int position, Object object) { } public List<EmojiPage> getDataSource() { return mViews; } } /** * click emoji item callback function */ public static interface OnEmojiItemClickListener { /** * invoked when click emiji board item</br> * * @param emojiBean clicked EmiojiBean */ public void onItemClick(EmojiBean emojiBean); } @Override public void onPageScrollStateChanged(int arg0) { } @Override public void onPageScrolled(int arg0, float arg1, int arg2) { } @Override public void onPageSelected(int pos) { mIndicators.get(mLastSelectViewPos).setImageDrawable(ResFinder.getDrawable(mNormalIcon)); mIndicators.get(pos).setImageDrawable(ResFinder.getDrawable(mSelectIcon)); mLastSelectViewPos = pos; } }