团队冲刺第一天--校园百晓生（STDeverything）

摘要：团队合作开发第一天，需要实现android端的注册登录功能，实现注册查重功能，登录账号密码匹配。

UI设计：

其中免费注册实现注册功能，点击进入注册界面，蓝色按钮实现登录功能（界面在之后进行优化）

代码：

import android.content.DialogInterface;
import android.os.Bundle;
import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;
import androidx.navigation.NavController;
import androidx.navigation.Navigation;
import androidx.navigation.ui.AppBarConfiguration;
import androidx.navigation.ui.NavigationUI;

import com.google.android.material.bottomnavigation.BottomNavigationView;
import com.lh.std_everything.ui.home.hometype.blog.WriteViewModel;

public class MainActivity extends AppCompatActivity {

    private NavController controller;

    public static String getUserid() {
        return userid;
    }

    private static String userid;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        BottomNavigationView bottomNavigationView=findViewById(R.id.bottomNavigationView);
        controller = Navigation.findNavController(this,R.id.navhost);
        AppBarConfiguration configuration=new AppBarConfiguration.Builder(bottomNavigationView.getMenu()).build();
        NavigationUI.setupActionBarWithNavController(this, controller,configuration);
        NavigationUI.setupWithNavController(bottomNavigationView, controller);

        userid=getIntent().getStringExtra("id");
    }

public class Login extends AppCompatActivity {

    private static final String SHARED_FILE_NAME ="USERCOUNT" ;
    private AutoCompleteTextView search;
    private EditText pwd;
    private FloatingActionButton login_btn;
    private final static String requrl="http://39.98.165.112/STDEverything/login_servlet"; //ip:116.62.178.231
    private TextView tip=null;

    // 要申请的权限
    private String[] permissions = {Manifest.permission.WRITE_EXTERNAL_STORAGE,Manifest.permission.CALL_PHONE,
            Manifest.permission.CAMERA,Manifest.permission.ACCESS_COARSE_LOCATION};


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        supportRequestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.activity_login);
        getPower();
        initView();
        String[] arr = getUserCount();
        ArrayAdapter<String> adapter= new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, arr);
        search.setAdapter(adapter);
        tip.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startActivity(new Intent(Login.this,Register.class));
            }
        });
        login_btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                final String name=search.getText().toString();
                String userpwd=pwd.getText().toString();
                final String reqdata="method=login&name="+name+"&pwd="+userpwd+"";
                new Thread(new Runnable() {
                    @Override
                    public void run() {
                        try {
                            final JSONObject jsonObject=new JSONObject(String.valueOf(HttpUtil.sendPost(requrl,reqdata)));//子线程获取json结果
                            runOnUiThread(new Runnable() {    //主线程运行跳转活动
                                @Override
                                public void run() {
                                    try {
                                        Toast.makeText(Login.this, jsonObject.get("msg").toString(), Toast.LENGTH_SHORT).show();
                                        if(jsonObject.get("status").equals("1")){  //状态码1代表登陆成功
                                            if(!judgeUserExists(name))
                                                recordUser(name);
                                            startActivity(new Intent(Login.this, MainActivity.class)
                                                    .putExtra("id",jsonObject.get("id").toString()));
                                        }
                                    } catch (JSONException e) {
                                        e.printStackTrace();
                                    }
                                }
                            });
                        } catch (JSONException e) {
                            e.printStackTrace();
                        }
                    }
                }).start();
            }
        });
    }
private void recordUser(String val){     //保存用户账户
        Date date=new Date();
        SimpleDateFormat sdf=new SimpleDateFormat("yyyyMMddhhmmssSSS");
        SharedPreferences shf=getSharedPreferences(SHARED_FILE_NAME, Context.MODE_PRIVATE);
        SharedPreferences.Editor editor=shf.edit();
        editor.putString(sdf.format(date),val);
        editor.apply();
    }

public class Register extends AppCompatActivity {

    private RegisterHandler handler=null;
    private EditText name_text=null;
    private EditText pwd_text=null;

    private final static String requrl="http://39.98.165.112/STDEverything/login_servlet"; //ip:116.62.178.231
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        supportRequestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.activity_register);
        FloatingActionButton register_btn = findViewById(R.id.register_btn);
        name_text=findViewById(R.id.name);
        pwd_text=findViewById(R.id.pwd);
        handler=new RegisterHandler(this);
        register_btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String name=name_text.getText().toString();
                String pwd=pwd_text.getText().toString();
                final String reqdata="method=login&name="+name+"&pwd="+pwd+"";
                new Thread(new Runnable() {
                    @Override
                    public void run() {
                        try {
                            JSONObject jsonObject=new JSONObject(String.valueOf(HttpUtil.sendPost(requrl,reqdata)));
                            Message msg=new Message();
                            msg.what=100;
                            msg.obj=jsonObject;
                            handler.sendMessage(msg);
                        } catch (JSONException e) {
                            e.printStackTrace();
                        }
                    }
                }).start();
            }
        });

    }

    static class RegisterHandler extends Handler{

        private final WeakReference<Register> mcontext;

        RegisterHandler(Register context){
            mcontext=new WeakReference<>(context);
        }
        @Override
        public void handleMessage(@NonNull Message msg) {
            super.handleMessage(msg);
            if(msg.what==100){
                JSONObject jsonObject= (JSONObject) msg.obj;
                try {
                    if(jsonObject.get("name").equals("yes"))
                        Toast.makeText(mcontext.get(),"用户名已存在",Toast.LENGTH_SHORT).show();
                    else if(jsonObject.get("name").equals("no")){
                        new Thread(new Runnable() {
                            @Override
                            public void run() {
                                String name=mcontext.get().name_text.getText().toString();
                                String pwd=mcontext.get().pwd_text.getText().toString();
                                final String reqdata="method=register&name="+name+"&pwd="+pwd+"";
                                HttpUtil.sendPost(requrl,reqdata);
                                sendEmptyMessage(888);
                            }
                        }).start();
                    }
                } catch (JSONException e) {
                    e.printStackTrace();
                }

            }else if(msg.what==888){
                Toast.makeText(mcontext.get(), "注册成功", Toast.LENGTH_SHORT).show();
                mcontext.get().startActivity(new Intent(mcontext.get(),Login.class));
            }
        }
    }
}

明天尝试将注册信息存入云服务器数据库。