文明交通安全出行app开发进度02

activity_main2.xml代码：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:layout_gravity="center_horizontal"
    android:background="@drawable/main2_bcg"
    xmlns:android="http://schemas.android.com/apk/res/android">



    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:layout_gravity="center_horizontal"
        android:id="@+id/main2_LL1">

        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="50dp"
            android:text="@string/main2_tv_one"
            android:textColor="@color/purple_700"
            android:textSize="40sp"
            android:textStyle="bold" />
    </LinearLayout>





    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/main2_LL2"
        android:layout_marginTop="50dp"
        android:layout_gravity="center_horizontal"
        android:orientation="vertical"
        >

        <EditText
            android:id="@+id/main2_username"
            android:layout_width="200dp"
            android:layout_height="100dp"
            android:hint="请输入用户名"
            android:drawableLeft="@drawable/username"
            android:drawablePadding="20dp"
            android:inputType="number" />
        <EditText
            android:id="@+id/main2_password"
            android:layout_width="200dp"
            android:layout_height="100dp"
            android:hint="请输入密码"
            android:drawableLeft="@drawable/password"
            android:drawablePadding="20dp"
            android:inputType="textPassword"
            />
        <Button
            android:id="@+id/main2_btn"
            android:layout_width="150dp"
            android:layout_height="75dp"
            android:layout_gravity="center"
            android:background="@drawable/main2_login"
            android:layout_marginTop="10dp"
            ></Button>

    </LinearLayout>




</LinearLayout>

MainActivity2.java：

package com.example.trafficapp;


import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import androidx.appcompat.app.AppCompatActivity;

public class MainActivity2 extends AppCompatActivity {

    private EditText main2_username;
    private EditText main2_password;
    private Button main2_btn;
    private String username;
    private String password;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);

        main2_username = findViewById(R.id.main2_username);
        main2_password = findViewById(R.id.main2_password);
        main2_btn = findViewById(R.id.main2_btn);

        main2_btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                username = main2_username.getText().toString();
                password = main2_password.getText().toString();
                if (username.length() < 6){
                    Toast.makeText(MainActivity2.this,"用户名不能少于六位",Toast.LENGTH_LONG).show();
                }else if(password.length() < 6){
                    Toast.makeText(MainActivity2.this,"密码不能少于六位",Toast.LENGTH_LONG).show();
                }else if(!username.equals("123456")){
                    Toast.makeText(MainActivity2.this,"用户名不正确",Toast.LENGTH_LONG).show();
                } else if(!password.equals("123456")){
                    Toast.makeText(MainActivity2.this,"密码不正确",Toast.LENGTH_LONG).show();
                } else if(username.equals("123456") && password.equals("123456")){
                    Intent intent = new Intent(MainActivity2.this,MainActivity3.class);
                    startActivity(intent);
                }




            }
        });
    }


}

实现了用户的登录功能。

效果图：