Android开发表情emoji功能开发

Android开发表情emoji功能开发

用图片做的表情，但能在TextView中显示正常

一、思路：

图片的名称和表情字符对应起来

二、效果图：

三、关键代码：

class MainActivity : AppCompatActivity() {

    private lateinit var rvEmoji: RecyclerView
    private lateinit var etContent: AppCompatEditText
    private lateinit var tvContent: TextView
    private lateinit var tvSubmit:TextView
    private lateinit var mContext:Context

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        mContext = this
        AndroidEmoji.init(mContext)
        RongUtils.init(mContext)

        rvEmoji = findViewById(R.id.rv_emoji)
        etContent = findViewById(R.id.et_content)
        tvContent = findViewById(R.id.tv_content)
        tvSubmit = findViewById(R.id.tv_submit)

        rvEmoji.run {
            itemAnimator = null
            layoutManager = GridLayoutManager(mContext,7, RecyclerView.VERTICAL,false)
            addItemDecoration(object : RecyclerView.ItemDecoration(){
                override fun getItemOffsets(outRect: Rect, view: View, parent: RecyclerView, state: RecyclerView.State) {
                    outRect.top = dpToPx(4)
                    outRect.bottom = dpToPx(4)
                }
            })
            adapter = EmojiAdapter{ emojiStr ->
                if(TextUtils.isEmpty(emojiStr)){
                   etContent.onKeyDown(
                        KeyEvent.KEYCODE_DEL,
                        KeyEvent(KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_DEL)
                    )
                }else{
                    etContent.selectionStart.let { index ->
                        val resultStr: String = AndroidEmoji.replaceEmojiWithText(emojiStr.toString())
                        if(index < 0 || index >= etContent.editableText.length){
                            etContent.append(AndroidEmoji.ensure(resultStr))
                        }else{
                            etContent.editableText.insert(index,AndroidEmoji.ensure(resultStr))
                        }
                    }
                }
            }.apply { setNewInstance( AndroidEmoji.getEmojiList() ) }
        }

        tvSubmit.setOnClickListener{
            // 无文本拦截
            if(etContent.text?.isEmpty() != false || etContent.text?.trim()?.isEmpty() != false){
                show(R.string.mood_publish_tip_1)
            } else {
                tvContent.run {
                        text = TextViewUtils.getSpannable( etContent.text.toString()){ spannable ->
                            runOnUiThread {
                                text = spannable
                            }
                        }
                }
            }
        }
    }
}

class EmojiAdapter(val callback :(CharSequence) -> Unit) : BaseQuickAdapter<AndroidEmoji.EmojiInfo, BaseViewHolder>(R.layout.item_emoji) {

    override fun convert(holder: BaseViewHolder, item: AndroidEmoji.EmojiInfo) {
        holder.getView<AppCompatImageView>(R.id.iv_emoji).run{
            if(holder.bindingAdapterPosition == data.size - 1){
                setImageResource(R.mipmap.rc_icon_emoji_delete)
            }else{
                setImageDrawable(context.getDrawables(item.resId))
            }
            setOnClickListener{
                if(holder.bindingAdapterPosition != data.size - 1){
                    val chars = Character.toChars(item.code)
                    val key = StringBuilder(chars[0].toString())
                    for (i in 1 until chars.size) { key.append(chars[i]) }
                    callback(key)
                }else{
                    callback("")
                }
            }

        }
    }
}

四、项目demo源码结构图：

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