Android输入框添加emoje表情图标的实现代码

前言

再次写聊天的时候才发现，代码积累是一件非常重要的事情，就如这篇博客的意图其实就是代码积累的目的，其实没什么难度，但是一件很琐碎的事情真的也需要时间去完成和调试，所以，获取你在写一个功能的时候会觉得并没有多难，但是如果可以最好把代码整理/积累下来。

demo描述

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：

chat_bottom_input：

<?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">
  <RelativeLayout
    android:id="@+id/rl_input"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="#f0f0f0">
    <ImageView
      android: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" />
    <LinearLayout
      android: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">
      <ImageView
        android:layout_width="45dp"
        android:layout_height="40dp"
        android:paddingBottom="10dp"
        android:paddingLeft="10dp"
        android:paddingRight="5dp"
        android:paddingTop="10dp"
        android:src="@mipmap/ic_launcher" />
      <EditText
        android: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.ViewPager
    android: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;

public class EmojiPageAdapter extends PagerAdapter {
  private ArrayList<GridView> mLists;
  public EmojiPageAdapter(Context context, ArrayList<GridView> array) {
    this.mLists = array;
  }
  @Override
  public int getCount() {
    return mLists.size();
  }
  @Override
  public boolean isViewFromObject(View arg0, Object arg1) {
    return arg0 == arg1;
  }
  @Override
  public Object instantiateItem(View arg0, int arg1) {
    ((ViewPager) arg0).addView(mLists.get(arg1));
    return mLists.get(arg1);
  }
  @Override
  public 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：

 @NonNull
  private 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;

public class EmojiGridAdapter extends BaseAdapter {
  private Context context;
  private int page;
  public EmojiGridAdapter(Context context, int page) {
    this.context = context;
    this.page = page;
  }
  @Override
  public int getCount() {
    return 24;
  }
  @Override
  public Object getItem(int i) {
    return null;
  }
  @Override
  public long getItemId(int i) {
    return 0;
  }
  @Override
  public 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);
    else
      holder.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。

大结构基本已经OK了，接着就要看比较核心的部分，Emoji 的处理，在接收到Event事件时，调用了chatBottomBar.appandEmoje(emojiEvent.s)

@Subscribe
  public 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
EmojiUtils.getEmojiText(editText.getText().toString() + s1);
return emojeText;这行代码里面。

那么就来看看 EmojiUtils 的代码吧：

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;

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);
          else
            break;
        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。

基本就到这里了，回过来看写的内容，自己都懒得吐槽，不过，好在只要有具体的demo，能读代码，有没有讲解其实都还好，也不用怕自己之后看不懂了。

源码下载：https://github.com/cjhandroid/EmojiInputDemo

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