今日学习

一、美化登陆界面(drawable+background)

二、button控件跳转功能

1.获取edittest中输入的信息

2.与规则匹配

3.成功跳转/失败

package com.example.tempost;

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;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    //声明控件
    private Button myBtnLogin;
    private EditText myEtUser;
    private  EditText myEtPassword;

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

        //找到控件
        myBtnLogin = findViewById(R.id.btn_login);
        myEtUser = findViewById(R.id.et_1);
        myEtPassword = findViewById(R.id.et_2);


//        //实现跳转---方法一
//        myBtnLogin.setOnClickListener(new View.OnClickListener() {
//            @Override
//            public void onClick(View v) {
//                Intent intent = null;
//                intent = new Intent(MainActivity.this,FunctionActivity.class);
//                startActivity(intent);
//            }
//        });


        //方法二---匹配对应的用户名和密码才能登录
        myBtnLogin.setOnClickListener(this);

    }

    public void onClick(View v){
        //需要获取输入的用户名和密码
        String username = myEtUser.getText().toString();
        String password = myEtPassword.getText().toString();
        Intent intent = null;

        //假设正确的账号和密码分别是why，123456
        if(username.equals("why")&&password.equals("123456")){
            //如果正确的话进行跳转
            intent = new Intent(MainActivity.this,FunctionActivity.class);
            startActivity(intent);
        }else{
            //不正确,弹出登陆失败
        }
    }

    @Override
    public void onPointerCaptureChanged(boolean hasCapture) {

    }
}

package com.example.tempost;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;

public class FunctionActivity extends AppCompatActivity {

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

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:orientation="vertical"
    android:padding="10dp"
    tools:context=".FunctionActivity">

    <TextView
        android:id="@+id/tv_func_1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="跳转后界面"
        android:textSize="25sp"
        android:gravity="center"
        android:textColor="@color/black"
        />

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:orientation="vertical"
    android:padding="10dp"
    android:background="@drawable/background"
    tools:context=".MainActivity">


    <TextView
        android:id="@+id/tv_1"
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:text="Welcome"
        android:textColor="#ED6438"
        android:textSize="20sp"
        android:gravity="center"
        android:layout_marginTop="200dp"

    />

    <EditText
        android:id="@+id/et_1"
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:textColor="@color/colorBlack"
        android:textSize="16sp"
        android:hint="用户名"
        android:maxLines="1"
        android:padding="5dp"
        android:layout_marginTop="10dp"
        android:background="@drawable/bg_username"
    />

    <EditText
        android:id="@+id/et_2"
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:textColor="@color/colorBlack"
        android:textSize="16sp"
        android:hint="密 码"
        android:inputType="textPassword"
        android:maxLines="1"
        android:padding="5dp"
        android:layout_marginTop="5dp"
        android:background="@drawable/bg_username"
    />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:layout_marginTop="20dp"
        >

        <Button
            android:id="@+id/btn_login"
            android:layout_width="0dp"
            android:layout_weight="1"
            android:layout_height="wrap_content"
            android:text="登录"
            android:layout_gravity="center"
            android:background="@drawable/btn_left"
        />

        <Button
            android:id="@+id/btn_registered"
            android:layout_width="0dp"
            android:layout_weight="1"
            android:layout_height="wrap_content"
            android:text="注册"
            android:layout_marginLeft="2dp"
            android:background="@drawable/btn_right"
        />

    </LinearLayout>


</LinearLayout>