易网时代-编程资源站
易网时代-编程资源站 
demo的功能其实就是仿照微信的 聊天 emoje 选择，采用了 viewpager+gridView 的方案，不过有空我会补上 recyclerView 的方案，目前还是先把功能实现了再说。另外在 TextView 和 EditText 中添加 emoje ，可以看看这篇博客：Android中使用TextView及EditText来实现表情图标的显示及插入功能 ，这篇博客中介绍了两种方法：
方法一：使用Html.fromHtml解析， 方法二：使用Bitmap直接画出来，我采用了第二种方法，使用bitmap画出来。
Read the fucking code
思路：既然是 viewpager + gridview 那么，先从大方向入手，完成 viewpager，再去完成 gridview。PS：代码里面使用了 RxJava、lambda、ButterKnife、EventBus、Glide。
这里将整个底部布局写成了一个组合的ViewGroup – ChatBottomBar，先从布局开始。
ChatBottomBar 的 XML – chat_bottom.xml:
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="wrap_content"android:animateLayoutChanges="true"android:orientation="vertical"><include layout="@layout/chat_bottom_input"></include><include layout="@layout/chat_bottom_function1"></include></LinearLayout>以下分别是 输入框的 xml 和 Emoji 的 xml：
<?xml version="1.0" encoding="utf-8"?><merge xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical"><RelativeLayoutandroid:id="@+id/rl_input"android:layout_width="match_parent"android:layout_height="wrap_content"android:background="#f0f0f0"><ImageViewandroid:id="@+id/showMore"android:layout_width="42dp"android:layout_height="60dp"android:paddingBottom="5dp"android:paddingLeft="9dp"android:paddingTop="9dp"android:src="@mipmap/ic_launcher" /><LinearLayoutandroid:layout_width="match_parent"android:layout_height="35dp"android:layout_centerVertical="true"android:layout_marginRight="15dp"android:layout_toRightOf="@+id/showMore"android:background="@drawable/shape_white_corner"android:gravity="center_vertical"android:orientation="horizontal"><ImageViewandroid:layout_width="45dp"android:layout_height="40dp"android:paddingBottom="10dp"android:paddingLeft="10dp"android:paddingRight="5dp"android:paddingTop="10dp"android:src="@mipmap/ic_launcher" /><EditTextandroid:id="@+id/editText"android:layout_width="match_parent"android:layout_height="match_parent"android:layout_marginRight="10dp"android:background="@null"android:gravity="center_vertical"android:hint="说点什么"android:maxLines="3"android:textColor="#999999"android:textColorHint="#dddddd"android:textSize="13sp" /></LinearLayout></RelativeLayout></merge>chat_bottom_function1：
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="wrap_content"android:background="#ffffff"android:orientation="vertical"><android.support.v4.view.ViewPagerandroid:id="@+id/emojes"android:layout_width="match_parent"android:layout_height="110dp"></android.support.v4.view.ViewPager></LinearLayout>首先是 viewpager 填充 gridView，从 PageAdapter 看起，看看需要哪些数据：
package cjh.emojicondemo;import android.content.Context;import android.support.v4.view.PagerAdapter;import android.support.v4.view.ViewPager;import android.view.View;import android.widget.GridView;import java.util.ArrayList;/** * Created by cjh on 16-11-8. */public class EmojiPageAdapter extends PagerAdapter {private ArrayList<GridView> mLists;public EmojiPageAdapter（Context context, ArrayList<GridView> array） {this.mLists = array;}@Overridepublic int getCount（） {return mLists.size（）;}@Overridepublic boolean isViewFromObject（View arg0, Object arg1） {return arg0 == arg1;}@Overridepublic Object instantiateItem（View arg0, int arg1） {（（ViewPager） arg0）.addView（mLists.get（arg1））;return mLists.get（arg1）;}@Overridepublic void destroyItem（View arg0, int arg1, Object arg2） {（（ViewPager） arg0）.removeView（（View） arg2）;}}其实基本就是PagerAdapter的模板代码，需要的仅仅只是 gridView，看下在ChatbottomBar中的代码：@BindView（R.id.emojes）android.support.v4.view.ViewPager emojes;....//每一页有24个表情，然后使用Math的ceil函数，计算出我们需要的最小页数 private void initEmoje（） {int pageCount = （int） Math.ceil（EmojiUtils.emojis.length / 24.0f）;ArrayList<GridView> pageData = new ArrayList<>（）;for （int i = 0; i < pageCount; i++） {GridView gv = getGridView（i）;pageData.add（gv）;}emojes.setAdapter（new EmojiPageAdapter（context, pageData））;}大结构基本就是这样了，接着就是小细节了，比如gridView的创建和展示： @NonNullprivate GridView getGridView（int i） {GridView gv = new GridView（context）;gv.setVerticalScrollBarEnabled（false）;gv.setAdapter（new EmojiGridAdapter（context, i））;gv.setGravity（Gravity.CENTER）;gv.setClickable（true）;gv.setFocusable（true）;gv.setNumColumns（8）;return gv;}adapter:package cjh.emojicondemo;import android.content.Context;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.ImageView;import org.greenrobot.eventbus.EventBus;/** * Created by cjh on 16-11-8. */public class EmojiGridAdapter extends BaseAdapter {private Context context;private int page;public EmojiGridAdapter（Context context, int page） {this.context = context;this.page = page;}@Overridepublic int getCount（） {return 24;}@Overridepublic Object getItem（int i） {return null;}@Overridepublic long getItemId（int i） {return 0;}@Overridepublic View getView（int i, View view, ViewGroup viewGroup） {ViewHolder holder = null;if （view == null） {view = LayoutInflater.from（context）.inflate（R.layout.chat_emoji, null）;holder = new ViewHolder（）;holder.image = （ImageView） view.findViewById（R.id.image）;view.setTag（holder）;}holder = （ViewHolder） view.getTag（）;int position = page * 23 + i;if （position < EmojiUtils.emojis.length）ImageLoader.load（context, EmojiUtils.icons[position], holder.image）;elseholder.image.setVisibility（View.GONE）;holder.image.setOnClickListener（view1 -> EventBus.getDefault（）.post（new EmojiEvent（EmojiUtils.emojis[page * 23 + i]）））;return view;}static class ViewHolder {public ImageView image;}}在这里，点击时间的传递我使用的是EventBus。@Subscribepublic void onEmojiEvent（EmojiEvent emojiEvent） {chatBottomBar.appandEmoje（emojiEvent.s）;}那么来看看ChatBottomBar的代码：public void appandEmoje（String s） {rx.Observable.just（s）.subscribeOn（Schedulers.io（））.map（s1 -> {SpannableString emojeText = EmojiUtils.getEmojiText（editText.getText（）.toString（） + s1）;return emojeText;}）.unsubscribeOn（Schedulers.io（））.observeOn（AndroidSchedulers.mainThread（））.subscribe（s2 -> {editText.setText（""）;editText.append（s2）;}）;}上面代码使用了RXJAVA，可以看到真正的核心是在 package cjh.emojicondemo;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.drawable.Drawable;import android.net.Uri;import android.text.Spannable;import android.text.SpannableString;import android.text.TextUtils;import android.text.style.ImageSpan;import android.text.style.RelativeSizeSpan;import android.util.SparseArray;import java.io.File;import java.util.ArrayList;import java.util.HashMap;import java.util.Map;import java.util.regex.Matcher;import java.util.regex.Pattern;import java.util.zip.Inflater;/** * Created by cjh on 16-11-7. */public class EmojiUtils {private static HashMap<Pattern, Integer> emoMap = new HashMap<>（）;public static final String DELETE_KEY = "em_delete_delete_expression";public static String[] emojis = new String[]{"[微笑]","[撇嘴]","[色]","[发呆]","[得意]","[流泪]","[害羞]","[闭嘴]","[睡]","[大哭]","[尴尬]","[发怒]","[调皮]","[呲牙]","[惊讶]","[难过]","[酷]","[冷汗]","[抓狂]","[吐]","[偷笑]","[愉快]","[白眼]","[傲慢]","[饥饿]","[困]","[惊恐]","[流汗]","[憨笑]","[悠闲]","[奋斗]","[咒骂]","[疑问]","[嘘]","[晕]","[疯了]","[衰]","[骷髅]","[敲打]","[再见]","[擦汗]","[抠鼻]","[鼓掌]","[糗大了]","[坏笑]","[左哼哼]","[右哼哼]","[哈欠]","[鄙视]","[委屈]","[快哭了]","[阴险]","[亲亲]","[吓]","[可怜]","[菜刀]","[西瓜]","[啤酒]","[篮球]","[乒乓]","[咖啡]","[饭]","[猪头]","[玫瑰]","[凋谢]","[嘴唇]","[爱心]","[心碎]","[蛋糕]","[闪电]","[炸弹]","[刀]","[足球]","[瓢虫]","[便便]","[月亮]","[太阳]","[礼物]","[拥抱]","[强]","[弱]","[握手]","[胜利]","[抱拳]","[勾引]","[拳头]","[差劲]","[爱你]","[NO]","[OK]"};public static int[] icons = new int[]{R.drawable.ee_1,R.drawable.ee_2,R.drawable.ee_3,R.drawable.ee_4,R.drawable.ee_5,R.drawable.ee_6,R.drawable.ee_7,R.drawable.ee_8,R.drawable.ee_9,R.drawable.ee_10,R.drawable.ee_11,R.drawable.ee_12,R.drawable.ee_13,R.drawable.ee_14,R.drawable.ee_15,R.drawable.ee_16,R.drawable.ee_17,R.drawable.ee_18,R.drawable.ee_19,R.drawable.ee_20,R.drawable.ee_21,R.drawable.ee_22,R.drawable.ee_23,R.drawable.ee_24,R.drawable.ee_25,R.drawable.ee_26,R.drawable.ee_27,R.drawable.ee_28,R.drawable.ee_29,R.drawable.ee_30,R.drawable.ee_31,R.drawable.ee_32,R.drawable.ee_33,R.drawable.ee_34,R.drawable.ee_35,R.drawable.ee_36,R.drawable.ee_37,R.drawable.ee_38,R.drawable.ee_39,R.drawable.ee_40,R.drawable.ee_41,R.drawable.ee_42,R.drawable.ee_43,R.drawable.ee_44,R.drawable.ee_45,R.drawable.ee_46,R.drawable.ee_47,R.drawable.ee_48,R.drawable.ee_49,R.drawable.ee_50,R.drawable.ee_51,R.drawable.ee_52,R.drawable.ee_53,R.drawable.ee_54,R.drawable.ee_55,R.drawable.ee_56,R.drawable.ee_57,R.drawable.ee_58,R.drawable.ee_59,R.drawable.ee_60,R.drawable.ee_61,R.drawable.ee_62,R.drawable.ee_63,R.drawable.ee_64,R.drawable.ee_65,R.drawable.ee_66,R.drawable.ee_67,R.drawable.ee_68,R.drawable.ee_69,R.drawable.ee_70,R.drawable.ee_71,R.drawable.ee_72,R.drawable.ee_73,R.drawable.ee_74,R.drawable.ee_75,R.drawable.ee_76,R.drawable.ee_77,R.drawable.ee_78,R.drawable.ee_79,R.drawable.ee_80,R.drawable.ee_81,R.drawable.ee_82,R.drawable.ee_83,R.drawable.ee_84,R.drawable.ee_85,R.drawable.ee_86,R.drawable.ee_87,R.drawable.ee_88,R.drawable.ee_89,R.drawable.ee_90,};static {for （int i = 0; i < emojis.length; i++） {emoMap.put（Pattern.compile（Pattern.quote（emojis[i]））, icons[i]）;}}public static SpannableString getEmojiText（String s） {SpannableString spannable = new SpannableString（s）;for （Map.Entry<Pattern, Integer> entry : emoMap.entrySet（）） {Matcher matcher = entry.getKey（）.matcher（spannable）;while （matcher.find（）） {for （ImageSpan span : spannable.getSpans（matcher.start（）,matcher.end（）, ImageSpan.class））if （spannable.getSpanStart（span） >= matcher.start（）&& spannable.getSpanEnd（span） <= matcher.end（））spannable.removeSpan（span）;elsebreak;Drawable drawable = MainActivity.context.getResources（）.getDrawable（entry.getValue（））;drawable.setBounds（0, 0, 60, 60）;ImageSpan imageSpan = new ImageSpan（drawable）;spannable.setSpan（imageSpan,matcher.start（）, matcher.end（）,Spannable.SPAN_EXCLUSIVE_EXCLUSIVE）;}}return spannable;}}这里为了方便知道插入表情的位置，我将emoji对应的中文转化成了Pattern对象，在getEmojiText里面做了遍历查询比对，这也就是为什么我会使用RX来异步操作。