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：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;

/**
 * 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;
  }

  @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;

/**
 * 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;
  }

  @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;

/**
 * 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);
          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

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。