Thread.sleep(200);
}
} catch (Exception e) {
e.printStackTrace();
}
}
}.start();
}
/**
-
接收来自客户端的消息
-
json数组包括socketID，msg
-
@author Administrator
*/
public class SocketThread extends Thread {
public int socketID;
public Socket socket;
public BufferedWriter writer;
public BufferedReader reader;
public SocketThread(Socket socket, int count) {
socketID = count;
this.socket = socket;
System.out.println("新增一台客户机，socketID："+socketID);
}
@Override
public void run() {
super.run();
try {
reader = new BufferedReader(new InputStreamReader(socket.getInputStream(), "utf-8"));
writer = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream(), "utf-8"));
while(isStartServer) {
if(reader.ready()) {
String data = reader.readLine();
JSONObject json = new JSONObject(data);
SocketMessage msg = new SocketMessage();
msg.to = json.getInt("to");
msg.msg = json.getString("msg");
msg.from = socketID;
msg.time = getTime(System.currentTimeMillis());
mMsgList.add(msg);
System.out.println("收到一条消息："+json.getString("msg")+" >>>> to socketID:"+json.getInt("to"));
}
Thread.sleep(100);
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
/**
-
得到此刻的时间
-
@param millTime
-
@return
*/
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);
}
public static void main(String[] args) {
MyServer server = new MyServer();
server.startSocket();
}
}
（1）先来看看manifest：
<manifest xmlns:android="schemas.android.com/apk/res/and…"
package="com.jw.socketclient"
android:versionCode="1"
android:versionName="1.0" >
<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;
}
文末
初级工程师拿到需求会直接开始做，然后做着做着发现有问题了，要么技术实现不了，要么逻辑有问题。
而高级工程师拿到需求会考虑很多，技术的可行性？对现有业务有没有帮助？对现有技术架构的影响？扩展性如何？等等...之后才会再进行设计编码阶段。
而现在随着跨平台开发，混合式开发，前端开发之类的热门，Android开发者需要学习和掌握的技术也在不断的增加。
通过和一些行业里的朋友交流讨论，以及参考现在大厂面试的要求。我们花了差不多一个月时间整理出了这份Android高级工程师需要掌握的所有知识体系。你可以看下掌握了多少。
混合式开发，微信小程序。都是得学会并且熟练的
这些是Android相关技术的内核，还有Java进阶
高级进阶必备的一些技术。像移动开发架构项目实战等
Android前沿技术；包括了组件化，热升级和热修复，以及各种架构跟框架的详细技术体系
以上即是我们整理的Android高级工程师需要掌握的技术体系了。可能很多朋友觉得很多技术自己都会了，只是一些新的技术不清楚而已。应该没什么太大的问题。
而这恰恰是问题所在！为什么别人高级工程师能年限突破30万，而你只有十几万呢？
就因为你只需补充你自己认为需要的，但并不知道企业需要的。这个就特别容易造成差距。因为你的技术体系并不系统，是零碎的，散乱的。那么你凭什么突破30万年薪呢？
我这些话比较直接，可能会戳到一些人的玻璃心，但是我知道肯定会对一些人起到点醒的效果的。而但凡只要有人因为我的这份高级系统大纲以及这些话找到了方向，并且付出行动去提升自我，为了成功变得更加努力。那么我做的这些就都有了意义。
喜欢的话请帮忙转发点赞一下能让更多有需要的人看到吧。谢谢！
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