登录界面

目标

主要完成对登录界面的设计,输入用户名和密码跳转至主界面
注：仅实现此功能，其他功能并未实现
登录界面如下

实现过程

布局文件

界面xml文件：

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<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/login_bg"
    tools:context=".ui.login.login">

    <TextView
        android:id="@+id/findPassword_text"
        android:layout_width="142dp"
        android:layout_height="45dp"
        android:gravity="center"
        android:text="找回密码"
        android:textColor="@color/white"
        android:textSize="15sp"
        app:layout_constraintRight_toRightOf="@id/btn_login"
        app:layout_constraintTop_toBottomOf="@id/btn_login" />

    <Button
        android:id="@+id/btn_login"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="40dp"
        android:background="@drawable/register_selector"
        android:text="登录"
        android:textColor="@color/white"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toBottomOf="@id/Password" />

    <ImageView
        android:id="@+id/avatar"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="484dp"
        app:layout_constraintTop_toBottomOf="@+id/login_title"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:srcCompat="@drawable/default_icon" />

    <EditText
        android:id="@+id/userName"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="416dp"
        android:background="@drawable/login_user_name_bg"
        android:drawableLeft="@drawable/user_name_icon"
        android:ems="10"
        android:hint="请输入用户名"
        android:inputType="textPersonName"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintBottom_toBottomOf="parent" />

    <EditText
        android:id="@+id/Password"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="52dp"
        android:layout_marginBottom="264dp"
        android:background="@drawable/login_psw_bg"
        android:ems="10"
        android:hint="请输入密码"
        android:drawableLeft="@drawable/psw_icon"
        android:inputType="textPassword"
        app:layout_constraintTop_toBottomOf="@id/userName"
        app:layout_constraintLeft_toLeftOf="@+id/userName" />

    <ImageView
        android:id="@+id/back_bottom"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_constraintTop_toTopOf="parent"
        android:background="@drawable/go_back_selector"
        app:srcCompat="@drawable/iv_back" />

    <TextView
        android:id="@+id/login_title"
        android:layout_width="230dp"
        android:layout_height="76dp"
        android:gravity="center"
        android:text="登录"
        android:textColor="@color/white"
        android:textSize="20sp"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        tools:layout_editor_absoluteX="80dp"
        tools:layout_editor_absoluteY="0dp" />

    <TextView
        android:id="@+id/register_text"
        android:layout_width="142dp"
        android:layout_height="45dp"
        android:text="立即注册"
        android:textColor="@color/white"
        android:gravity="center"
        android:textSize="15sp"
        app:layout_constraintTop_toBottomOf="@id/btn_login"
        app:layout_constraintLeft_toLeftOf="@id/btn_login"
        tools:layout_editor_absoluteX="51dp"
        tools:layout_editor_absoluteY="492dp" />

</androidx.constraintlayout.widget.ConstraintLayout>

按钮选择器register_selector.xml

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<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:drawable="@drawable/register_icon_selected" android:state_pressed="true"/>
    <item android:drawable="@drawable/register_icon_normal"/>
</selector>

返回图标go_back_selector.xml

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<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <!-- Even though these two point to the same resource, have two states so the drawable will invalidate itself when coming out of pressed state. -->
    <item android:drawable="@drawable/iv_back_selected" android:state_pressed="true"/>
    <item android:drawable="@drawable/iv_back"/>
</selector>

Java代码

需要用户名和密码同时输入test时，界面跳转至主界面

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package com.example.mytest.ui.login;

import androidx.appcompat.app.AppCompatActivity;

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 com.example.mytest.MainActivity;
import com.example.mytest.R;

public class login extends AppCompatActivity implements View.OnClickListener{

    Button btn_loginIn;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login2);

        btn_loginIn = (Button) findViewById(R.id.btn_login);
        btn_loginIn.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        String userName="",password="";
        EditText editText1 =(EditText)findViewById(R.id.userName);
        userName=editText1.getText().toString();
        EditText editText2 =(EditText)findViewById(R.id.Password);
        password=editText2.getText().toString();

        if (v.getId() == btn_loginIn.getId()&&userName.equals("test")&&password.equals("test")){
            Intent intent = new Intent();
            intent.setClass(this, MainActivity.class);
            startActivity(intent);
        }
        else {
            Toast.makeText(this, "账号密码错误", Toast.LENGTH_SHORT).show();
        }

    }
}

项目地址

github项目地址