【Android】简易聊天软件模板

简易聊天软件模板-第一行代码

代码

• Menifest:

<!--talk-->
<activity android:name=".talktalk.TalkActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>

• Koltin

​​Msg:​​

class Msg(val content: String, val type: Int) {
    companion object {
        const val TYPE_RECEIVED = 0
        const val TYPE_SEND = 1
    }
}

​​MsgAdapter:​​

class MsgAdapter(private val msgList: List<Msg>) : RecyclerView.Adapter<RecyclerView.ViewHolder>() {

    inner class LeftViewHolder(view: View) : RecyclerView.ViewHolder(view) {
        val leftMsg: TextView = view.findViewById(R.id.talk_msg_left)
    }

    inner class RightViewHolder(view: View) : RecyclerView.ViewHolder(view) {
        val rightMsg: TextView = view.findViewById(R.id.talk_msg_right)
    }

    override fun getItemViewType(position: Int): Int {
        val msg=msgList[position]
        return msg.type
    }

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecyclerView.ViewHolder =
        if (viewType == Msg.TYPE_RECEIVED) {
            val view =
                LayoutInflater.from(parent.context).inflate(R.layout.msg_left_item, parent, false)
            LeftViewHolder(view)
        } else {
            val view =
                LayoutInflater.from(parent.context).inflate(R.layout.msg_right_item, parent, false)
            RightViewHolder(view)
        }

    override fun onBindViewHolder(holder: RecyclerView.ViewHolder, position: Int) {
        val msg = msgList[position]
        when (holder) {
            is LeftViewHolder -> holder.leftMsg.text = msg.content
            is RightViewHolder -> holder.rightMsg.text = msg.content
            else -> throw IllegalArgumentException()
        }
    }

    override fun getItemCount() = msgList.size
}

​​TalkActivity:​​

class TalkActivity : AppCompatActivity(), View.OnClickListener {
    private lateinit var talkBinding: ActivityTalkBinding

    private lateinit var adapter: MsgAdapter

    private val msgList = ArrayList<Msg>()

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        talkBinding = ActivityTalkBinding.inflate(layoutInflater)
        setContentView(talkBinding.root)

        initMsg()
        val layoutManager = LinearLayoutManager(this)
        talkBinding.talkRecycler.layoutManager = layoutManager
        if (!::adapter.isInitialized) {
            adapter = MsgAdapter(msgList)
        }
        talkBinding.talkRecycler.adapter = adapter
        talkBinding.talkSend.setOnClickListener(this)
    }

    override fun onClick(v: View?) {
        when (v) {
            talkBinding.talkSend -> {
                val content = talkBinding.talkInputText.text.toString()
                if (content.isNotEmpty()) {
                    val msg = Msg(content, Msg.TYPE_SEND)
                    msgList.add(msg)
                    adapter.notifyItemInserted(msgList.size - 1)//当有新消息时刷新Recycler中的显示
                    talkBinding.talkRecycler.scrollToPosition(msgList.size - 1)//将RecyclerView定位到最后一行
                    talkBinding.talkInputText.setText("")//清空输入框
                }
            }
        }
    }

    private fun initMsg() {
        val msg1 = Msg("Hello guy", Msg.TYPE_RECEIVED)
        val msg2 = Msg("Hello,Who is that", Msg.TYPE_SEND)
        val msg3 = Msg("This is Tom. Nice to meet you. ", Msg.TYPE_RECEIVED)
        msgList.apply {
            add(msg1)
            add(msg2)
            add(msg3)
        }
    }
}

• Layout:

​​activity_talk:​​

<?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="match_parent"
    android:orientation="vertical"
    android:background="#d8e0e8">

    <androidx.recyclerview.widget.RecyclerView
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:id="@+id/talk_recycler"
        android:layout_weight="1"/>
    
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <EditText
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:hint="Type something here"
            android:maxLines="2"
            android:id="@+id/talk_inputText"/>

        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/talk_send"
            android:text="Send"/>

    </LinearLayout>
    
</LinearLayout>

​​msg_left_item:​​

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    android:padding="10dp">

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="left"
        android:background="@drawable/message_left">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/talk_msg_left"
            android:layout_gravity="center"
            android:layout_margin="10dp"
            android:textColor="#fff"/>
    </LinearLayout>
</FrameLayout>

​​msg_right_item:​​

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    android:padding="10dp">

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="right"
        android:background="@drawable/message_right">

        <TextView
            android:id="@+id/talk_msg_right"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:layout_margin="10dp"
            android:textColor="#000" />
    </LinearLayout>
</FrameLayout>

效果: