【Android】简易聊天软件模板

今天药忘吃喽~ 2022-11-17 10:16 138阅读 0赞

### 简易聊天软件模板-第一行代码 ###

> **代码**

*  **Menifest:**

<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:**

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