<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.jw.socketclient.MainActivity"
android:label="@string/app_name" >
（2）用到的依赖：
implementation 'androidx.legacy:legacy-support-v4:1.0.0'
implementation 'androidx.recyclerview:recyclerview:1.1.0'
（3）界面：
activity_main.xml
<LinearLayout xmlns:android="schemas.android.com/apk/res/and…"
xmlns:tools="schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity"
android:orientation="vertical" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<Button
android:id="@+id/start_btn"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="start"/>
<Button
android:id="@+id/stop_btn"
android:text="stop"
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
<EditText
android:id="@+id/socket_id_edt"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="socketID"/>
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/rv"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="50dp"
android:background="#E3ECE3"
<EditText
android:id="@+id/msg_edt"
android:layout_marginLeft="30dp"
android:layout_marginRight="10dp"
android:layout_width="160dp"
android:layout_height="40dp"
android:background="#ffffff"
android:layout_gravity="center"
android:layout_weight="9"
/>
<Button
android:id="@+id/send_btn"
android:layout_width="40dp"
android:layout_height="35dp"
android:text="发送"
android:textColor="#ffffff"
android:layout_gravity="center"
android:background="#0B9C10"
android:layout_weight="1"/>
item.xml（右边的界面，展示自己发出的消息）
<LinearLayout xmlns:android="schemas.android.com/apk/res/and…"
xmlns:tools="schemas.android.com/tools"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:padding="6dp"
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center_horizontal"
android:orientation="vertical" >
<TextView
android:id="@+id/tv_time"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#ECE8E8"
android:padding="2dp"
android:textColor="#ffffff"
android:textSize="12sp" />
<RelativeLayout
android:layout_marginTop="5dp"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
<ImageView
android:id="@+id/iv_userhead"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_alignParentRight="true"
android:background="@drawable/head_img"
android:focusable="false" />
<TextView
android:id="@+id/tv_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="@id/iv_userhead"
android:textColor="#818181"
android:textSize="15sp" />
<TextView
android:id="@+id/tv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="10dp"
android:layout_toLeftOf="@id/iv_userhead"
android:clickable="true"
android:focusable="true"
android:lineSpacingExtra="2dp"
android:minHeight="50dp"
android:gravity="center"
android:background="@drawable/chat_to"
android:textColor="#ff000000"
android:textSize="15sp" />
item2.xml（左边界面，展示别人发过来的消息）
<LinearLayout xmlns:android="schemas.android.com/apk/res/and…"
xmlns:tools="schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:padding="6dp"
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:orientation="vertical" >
<TextView
android:id="@+id/tv_time2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#ECE8E8"
android:padding="2dp"
android:textColor="#ffffff"
android:textSize="12sp" />
<RelativeLayout
android:layout_marginTop="5dp"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
<ImageView
android:id="@+id/iv_userhead2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:background="@drawable/feedback"
android:focusable="false" />
<TextView
android:id="@+id/tv_name2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toLeftOf="@id/iv_userhead2"
android:textColor="#818181"
android:textSize="15sp"
android:layout_alignParentLeft="true"
/>
<TextView
android:id="@+id/tv2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:layout_toRightOf="@id/iv_userhead2"
android:clickable="true"
android:focusable="true"
android:gravity="center"
android:lineSpacingExtra="2dp"
android:minHeight="50dp"
android:background="@drawable/chat_from"
android:textColor="#ff000000"
android:textSize="15sp"
/>
MainActivity.java
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.Socket;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import org.json.JSONObject;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.EditText;
import android.app.Activity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
public class MainActivity extends Activity implements OnClickListener {
private EditText mSocketIDEdt, mMessageEdt;
private StringBuffer mConsoleStr = new StringBuffer();
private Socket mSocket;
private boolean isStartRecieveMsg;
private RecyclerView rv;
private SocketHandler mHandler;
protected BufferedReader mReader;
protected BufferedWriter mWriter;
private static final int COMPLETED = 1;
private ArrayList list;
private MyAdapter adapter;
Thread thread;
private static boolean flag=false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView();
}
private void initView() {
mSocketIDEdt = (EditText) findViewById(R.id.socket_id_edt);
mMessageEdt = (EditText) findViewById(R.id.msg_edt);
findViewById(R.id.start_btn).setOnClickListener(this);
findViewById(R.id.send_btn).setOnClickListener(this);
findViewById(R.id.stop_btn).setOnClickListener(this);
mHandler = new SocketHandler();
rv = (RecyclerView) findViewById(R.id.rv);
list = new ArrayList<>();
adapter = new MyAdapter(this);
rv.setAdapter(adapter);
LinearLayoutManager manager = new LinearLayoutManager(MainActivity.this, LinearLayoutManager.VERTICAL, false);
rv.setLayoutManager(manager);
}
private void initSocket() {
thread = new Thread(new Runnable() {
@Override
public void run() {
try {
isStartRecieveMsg = true;
mSocket = new Socket("192.168.2.172", 2000);
mReader = new BufferedReader(new InputStreamReader(mSocket.getInputStream(), "utf-8"));
mWriter = new BufferedWriter(new OutputStreamWriter(mSocket.getOutputStream(), "utf-8"));
while(isStartRecieveMsg) {
if(mReader.ready()) {
mHandler.obtainMessage(0, mReader.readLine()).sendToTarget();
}
Thread.sleep(200);
}
mWriter.close();
mReader.close();
mSocket.close();
} catch (Exception e) {
e.printStackTrace();
}
}
});
thread.start();
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.send_btn:
send();
break;
case R.id.start_btn:
if(!isStartRecieveMsg) {
initSocket();
}
break;
case R.id.stop_btn:
flag=true;
System.err.println("中断");
default:
break;
}
}
private void send() {
new AsyncTask<String, Integer, String>() {
@Override
protected String doInBackground(String... params) {
sendMsg();
return null;
}
}.execute();
}
protected void sendMsg() {
try {
String socketID = mSocketIDEdt.getText().toString().trim();
String msg = mMessageEdt.getText().toString().trim();
JSONObject json = new JSONObject();
json.put("to", socketID);
json.put("msg", msg);
mWriter.write(json.toString()+"\n");
mWriter.flush();
mConsoleStr.append("我" +msg+" "+getTime(System.currentTimeMillis())+"\n");
MyBean bean = new MyBean("我",2,msg,getTime(System.currentTimeMillis()));
list.add(bean);
/**
- 在子线程更新UI
*/
Message message = new Message();
message.what = COMPLETED;
mHandler.sendMessage(message);
} catch (Exception e) {
e.printStackTrace();
}
}
class SocketHandler extends Handler {
@Override
public void handleMessage(Message msg) {
// TODO Auto-generated method stub
super.handleMessage(msg);
switch (msg.what) {
case 0:
try {
JSONObject json = new JSONObject((String)msg.obj);
MyBean bean = new MyBean(json.getString("from"),1,json.getString("msg"),getTime(System.currentTimeMillis()));
list.add(bean);
} catch (Exception e) {
e.printStackTrace();
}
// 向适配器set数据
adapter.setData(list);
rv.setAdapter(adapter);
LinearLayoutManager manager = new LinearLayoutManager(MainActivity.this, LinearLayoutManager.VERTICAL, false);
rv.setLayoutManager(manager);
rv.scrollToPosition(adapter.getItemCount()-1);//recycleview滑到底部
break;
case 1:
// 向适配器set数据
adapter.setData(list);
rv.setAdapter(adapter);
manager = new LinearLayoutManager(MainActivity.this, LinearLayoutManager.VERTICAL, false);
rv.setLayoutManager(manager);
rv.scrollToPosition(adapter.getItemCount()-1);//recycleview滑到底部
break;
default:
break;
}
}
}
@Override
public void onBackPressed() {
super.onBackPressed();
isStartRecieveMsg = false;
}
private String getTime(long millTime) {
Date d = new Date(millTime);
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
System.out.println(sdf.format(d));
return sdf.format(d);
}
}
MyAdapter.java
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import androidx.recyclerview.widget.RecyclerView;
import java.util.ArrayList;
public class MyAdapter extends RecyclerView.Adapter {
private Context context;
private ArrayList data;
private static final int TYPEONE = 1;
private static final int TYPETWO = 2;
public MyAdapter(Context context) {
this.context = context;
}
public void setData(ArrayList data) {
this.data = data;
notifyDataSetChanged();
}
@Override
public int getItemViewType(int position) {
return data.get(position).getNumber();
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
RecyclerView.ViewHolder holder = null;
switch (viewType){
case TYPEONE:
View view = LayoutInflater.from(context).inflate(R.layout.item2,parent,false);
holder = new OneViewHolder(view);
break;
case TYPETWO:
View view1 = LayoutInflater.from(context).inflate(R.layout.item,parent,false);
holder = new TwoViewHolder(view1);
break;
}
return holder;
}
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
int itemViewType = getItemViewType(position);
switch (itemViewType){
case TYPEONE:
OneViewHolder oneViewHolder = (OneViewHolder) holder;
oneViewHolder.tv2.setText(data.get(position).getData());
oneViewHolder.name2.setText(data.get(position).getName());
oneViewHolder.time2.setText(data.get(position).getTime());
break;
case TYPETWO:
TwoViewHolder twoViewHolder = (TwoViewHolder) holder;
twoViewHolder.tv1.setText(data.get(position).getData());
twoViewHolder.name1.setText(data.get(position).getName());
twoViewHolder.time1.setText(data.get(position).getTime());
break;
}
}
@Override
public int getItemCount() {
return data != null && data.size() > 0 ? data.size() : 0;
}
class OneViewHolder extends RecyclerView.ViewHolder{
private TextView tv2;
private TextView name2,time2;
public OneViewHolder(View itemView) {
super(itemView);
tv2 = (TextView) itemView.findViewById(R.id.tv2);
name2 = (TextView) itemView.findViewById(R.id.tv_name2);
time2 = (TextView) itemView.findViewById(R.id.tv_time2);
}
}
class TwoViewHolder extends RecyclerView.ViewHolder{
private TextView tv1;
private TextView name1,time1;
public TwoViewHolder(View itemView) {
super(itemView);
tv1 = (TextView) itemView.findViewById(R.id.tv);
name1 = (TextView) itemView.findViewById(R.id.tv_name);
time1 = (TextView) itemView.findViewById(R.id.tv_time);
}
}
}
MyBean.java
public class MyBean {
private String data;
private String time,name;
private int number;
public MyBean() {
}
public MyBean(String name, int number,String data,String time) {
this.data = data;
this.number = number;
this.name = name;
this.time = time;
}
public String getTime() {
return time;
}
public void setTime(String time) {
this.time = time;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getData() {
return data;
}
最后
都说三年是程序员的一个坎，能否晋升或者提高自己的核心竞争力，这几年就十分关键。
技术发展的这么快，从哪些方面开始学习，才能达到高级工程师水平，最后进阶到Android架构师/技术专家？我总结了这 5大块；
我搜集整理过这几年阿里，以及腾讯，字节跳动，华为，小米等公司的面试题，把面试的要求和技术点梳理成一份大而全的“ Android架构师”面试 PDF（实际上比预期多花了不少精力），包含知识脉络 + 分支细节。
Java语言与原理； 大厂，小厂。Android面试先看你熟不熟悉Java语言
高级UI与自定义view； 自定义view，Android开发的基本功。
性能调优； 数据结构算法，设计模式。都是这里面的关键基础和重点需要熟练的。
NDK开发； 未来的方向，高薪必会。
前沿技术； 组件化，热升级，热修复，框架设计
网上学习 Android的资料一大堆，但如果学到的知识不成体系，遇到问题时只是浅尝辄止，不再深入研究，那么很难做到真正的技术提升。希望这份系统化的技术体系对大家有一个方向参考。
我在搭建这些技术框架的时候，还整理了系统的高级进阶教程，会比自己碎片化学习效果强太多，GitHub可见；《Android架构视频+学习笔记》
当然，想要深入学习并掌握这些能力，并不简单。关于如何学习，做程序员这一行什么工作强度大家都懂，但是不管工作多忙，每周也要雷打不动的抽出 2 小时用来学习。
不出半年，你就能看出变化！
