Drink-Order-System-master/MainActivity.java

package com.example.drink_order_system;

import android.Manifest;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.os.Handler;
import android.os.Message;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;

import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;

import java.io.IOException;
import okhttp3.Call;
import okhttp3.FormBody;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.RequestBody;
import okhttp3.Response;

public class MainActivity extends AppCompatActivity {
    public static final int MSG_LOGIN_ERR = 1; //登录错误
    public static final int MSG_CONNET_ERR = 2; //网络链接错误
    public static final int MSG_SIGNUP_ERR = 3;
    public static final int MSG_SIGNUP_SUC = 4;
    private final Context mContext = this;
    private EditText ET_username;
    private EditText ET_password;
    private LoginHandler login_handler;
    String responseData=null;
    public void handlePermission() {
        // 检查是否开启 Manifest.permission.xxx
        // (xxx 为权限，根据自己需求添加）
        if (ActivityCompat.checkSelfPermission(this,
                Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED) {
            Toast.makeText(this, "Permission has been allowed", Toast.LENGTH_SHORT).show();
        } else {
            Toast.makeText(this, "ask for permission", Toast.LENGTH_SHORT).show();
            // 请求权限
            ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1);
        }
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        login_handler = new LoginHandler();
        setContentView(R.layout.activity_main);
        handlePermission();
        ET_username = findViewById(R.id.et_username);
        ET_password = findViewById(R.id.et_password);

    }

    public void BT_signUp_onClick(View v) {
        String username = ET_username.getText().toString();
        System.out.println(username);
        String password = ET_password.getText().toString();

        String login_check_url = Constant.SIGNUP_URL + "?Cac=" + username + "&Cpw=" + password;
        Log.e("RegisterActivity", login_check_url);
        okhttp3.Callback callback = new okhttp3.Callback() {
            @Override
            public void onResponse(Call call, Response response) throws IOException {
                responseData = response.body().string();
                Log.e("RegisterActivity", "onResponse");
                Log.e("RegisterActivity", responseData);
                Log.e("RegisterActivity", "Response length: " + responseData.length());

                if (responseData.trim().equals("success")) {
                    Message msg = new Message();
                    msg.what = MSG_SIGNUP_SUC;
                    login_handler.sendMessage(msg);
                    Intent intent = new Intent(MainActivity.this, RootActivity.class);
                    intent.putExtra("userName", username);
                    startActivity(intent);
                    finish();
                } else {
                    Message msg = new Message();
                    msg.what = MSG_SIGNUP_ERR;
                    login_handler.sendMessage(msg);
                }
                //showResponse(responseData);
            }

            @Override
            public void onFailure(Call call, IOException e) {
                String responseData = "Error!";
                Log.e("RegisterActivity", "Failure");
                Log.e("RegisterActivity", responseData);
                Message msg = new Message();
                msg.what = MSG_CONNET_ERR;
                login_handler.sendMessage(msg);
                //showResponse(responseData);
            }
        };
        OkHttpClient client = new OkHttpClient();

        Request request = new Request.Builder()
                .url(login_check_url)
                .build();
        //发送请求
        client.newCall(request).enqueue(callback);
    }

    public void BT_logIn_onClick(View v) {
        String username = ET_username.getText().toString();
        System.out.println(username);
        String password = ET_password.getText().toString();
//        if(username.equals("")||password.equals(""))
//        {
//            Toast.makeText(this, "用户名或密码不能为空(!_!)", Toast.LENGTH_SHORT).show();
//        }
//        else {
//            Account temp = new Account(username, password, mContext);
//            Intent intent;
//            if (temp.exist()) {
//                //System.out.println("success");
//                intent = new Intent(MainActivity.this, RootActivity.class);
//                intent.putExtra("userName", username);
//                startActivity(intent);
//            } else {
//                //System.out.println("fail");
//                Toast.makeText(this, "登录失败 (@_@)\n用户名或密码错误", Toast.LENGTH_SHORT).show();
//            }
//        }
        String login_check_url = Constant.LOGIN_URL + "?Cac=" + username + "&Cpw=" + password;
        Log.e("LoginActivity", login_check_url);
        okhttp3.Callback callback = new okhttp3.Callback() {
            @Override
            public void onResponse(Call call, Response response) throws IOException {
                responseData = response.body().string();
                Log.e("LoginActivity", "onResponse");
                Log.e("LoginActivity", responseData);
                Log.e("LoginActivity", "Response length: " + responseData.length());

                if (responseData.trim().equals("success")) {
                    Intent intent = new Intent(MainActivity.this, RootActivity.class);
                    intent.putExtra("userName", username);
                    startActivity(intent);
                } else {
                    Message msg = new Message();
                    msg.what = MSG_LOGIN_ERR;
                    login_handler.sendMessage(msg);
                }
                //showResponse(responseData);
            }

            @Override
            public void onFailure(Call call, IOException e) {
                String responseData = "Error!";
                Log.e("LoginActivity", "Failure");
                Log.e("LoginActivity", responseData);
                Message msg = new Message();
                msg.what = MSG_CONNET_ERR;
                login_handler.sendMessage(msg);
                //showResponse(responseData);
            }
        };
        OkHttpClient client = new OkHttpClient();

        Request request = new Request.Builder()
                .url(login_check_url)
                .build();
        //发送请求
        client.newCall(request).enqueue(callback);
    }

    class LoginHandler extends Handler {
        @Override
        public void dispatchMessage(Message msg) {
            super.dispatchMessage(msg);
            switch (msg.what) {
                case MSG_LOGIN_ERR:
                    ET_username.setText("");
                    ET_password.setText("");
                    ET_username.requestFocus();
//                    Toast.makeText(context, "用户名或密码输入不正确，请重新输入",
//                            Toast.LENGTH_SHORT).show();
                    new AlertDialog.Builder(MainActivity.this)
                            .setTitle("注意")
                            .setMessage("用户名或密码输入不正确，请重新输入")
                            //.setMessage(responseData)
                            .setPositiveButton("确定", null)
                            .create()
                            .show();
                    break;
                case MSG_CONNET_ERR:
                    new AlertDialog.Builder(MainActivity.this)
                            .setTitle("注意")
                            .setMessage("网络连接错误，请检查网络")
                            .setPositiveButton("确定", null)
                            .create()
                            .show();
                    break;
                case MSG_SIGNUP_ERR:
                    new AlertDialog.Builder(MainActivity.this)
                            .setTitle("注意")
                            .setMessage("注册失败")
                            .setPositiveButton("确定", null)
                            .create()
                            .show();
                    break;
            }
        }
    }

}