2024/3/9

今天创建了一个登录页面主要实现登录的一些业务逻辑：

package com.example.team;

import android.annotation.SuppressLint;
import android.content.ContentValues;
import android.content.Intent;
import android.database.sqlite.SQLiteDatabase;
import android.graphics.Typeface;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

import androidx.appcompat.app.AppCompatActivity;

import com.example.R;
import com.example.team.dao.UserDao;
import com.example.team.entity.User;

public class SecondActivity extends AppCompatActivity {

    private SQLiteDatabase db;
    private EditText username;
    private TextView mText,textView1,textView2,button1;
    private Button button;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        username = findViewById(R.id.username);
        mText = findViewById(R.id.Text1);
        textView1 = findViewById(R.id.textView1);
        textView2 = findViewById(R.id.Text2);
        button = findViewById(R.id.button);
        button1 = findViewById(R.id.button1);
        Typeface typeface = Typeface.createFromAsset(getAssets(), "font/xiniu.ttf");
        Typeface typeface2 = Typeface.createFromAsset(getAssets(), "font/momo.ttf");
        mText.setTypeface(typeface2);
        username.setTypeface(typeface);
        textView1.setTypeface(typeface);
        textView2.setTypeface(typeface2);
        button.setTypeface(typeface);
        button1.setTypeface(typeface);

        MyDatabaseHelper dbHelper = new MyDatabaseHelper(this);
        db = dbHelper.getWritableDatabase();
    }

    public void reg(View view) {
        startActivity(new Intent(getApplicationContext(), RegisterActivity.class));
    }

    public void login(View view) {
        String cusername = username.getText().toString();
        EditText editTextName = findViewById(R.id.username);
        EditText editTextPassword = findViewById(R.id.password);
        ContentValues values = new ContentValues();
        values.put("username", cusername);

        long newRowId = db.insert("user", null, values);

        new Thread(() -> {
            UserDao userDao = new UserDao(SecondActivity.this);
            boolean isLoggedIn = userDao.login(editTextName.getText().toString(), editTextPassword.getText().toString());
            int msg = isLoggedIn ? 1 : 0;
            hand1.sendEmptyMessage(msg);
        }).start();
    }
    @SuppressLint("HandlerLeak")
    final Handler hand1 = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            if (msg.what == 1) {
                Toast.makeText(getApplicationContext(), "登录成功", Toast.LENGTH_LONG).show();
                startIwriterActivity(username.getText().toString());
            } else {
                Toast.makeText(getApplicationContext(), "登录失败", Toast.LENGTH_LONG).show();
            }
        }
    };

    private void startIwriterActivity(String username) {
        new Thread(() -> {
            UserDao userDao = new UserDao(SecondActivity.this);
            User user = userDao.findUser(username);
            Intent intent = new Intent(SecondActivity.this, Iwriter.class);
            intent.putExtra("username", username); // 将用户名作为额外数据传递
            intent.putExtra("name", user.getName()); // 将xm作为额外数据传递
            startActivity(intent); // 启动Iwriter活动

        }).start();

    }

    public void logout(View v) {
    }
}