第八次作业

xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.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"
    tools:context=".MainActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="#55000000"
        android:orientation="vertical"
        android:paddingLeft="30dp"
        android:paddingRight="30dp" >

        <LinearLayout
            android:layout_marginTop="80dp"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:gravity="center_vertical"
            android:orientation="horizontal" >

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="QQ"
                android:textColor="#fff"
                android:textSize="50dp" />
        </LinearLayout>
        <EditText
            android:id="@+id/userid"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="30dp"
            android:background="@null"
            android:hint="QQ号/手机号/邮箱"
            android:maxLength="13"
            android:singleLine="true"
            android:textColor="#fff"
            android:textSize="25sp"
            android:textColorHint="#eee" />
        <View
            android:layout_width="match_parent"
            android:layout_height="1px"
            android:layout_marginTop="10dp"
            android:background="#eee" />
        <EditText
            android:id="@+id/lipassword"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="10dp"
            android:background="@null"
            android:hint="密码"
            android:inputType="textPassword"
            android:maxLength="13"
            android:singleLine="true"
            android:textColor="#fff"
            android:textSize="25dp"
            android:textColorHint="#eee" />
        <View
            android:layout_width="match_parent"
            android:layout_height="1px"
            android:layout_marginTop="10dp"
            android:background="#eee" />
        <Button
            android:id="@+id/login"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="10dp"
            android:background="#aaafff"
            android:text="登录"
           android:onClick="onClick"
            android:textColor="#fff"
            android:textSize="25sp" />
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="10dp"
            android:orientation="horizontal" >

            <CheckBox
                android:id="@+id/cbRemember"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginLeft="15dp"
                android:text="记住密码"
                android:textSize="20sp" />
            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:gravity="right"
                android:text="新用户注册"
                android:textColor="#cc1CA4DE"
                android:textSize="20dp" />
        </LinearLayout>
    </LinearLayout>

</android.support.constraint.ConstraintLayout>
java

package com.example.denglu;

import android.app.Notification;
import android.content.SharedPreferences;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    EditText userid;  //声明控件
    EditText lipassword;
    Button login;
    private CheckBox cbRemember;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        userid=(EditText)findViewById(R.id.userid); //控件的初始化
        lipassword=(EditText)findViewById(R.id.lipassword);
        login=(Button)findViewById(R.id.login);   //监听
        cbRemember = findViewById(R.id.cbRemember);
        SharedPreferences sp = getSharedPreferences("date", MODE_PRIVATE);
        userid.setText(sp.getString("name", ""));
        lipassword.setText(sp.getString("password", ""));



        login.setOnClickListener(new View.OnClickListener() {
            @Override   //方法的调用
            public void onClick(View view) {

                if ("admin".equals(userid.getText().toString())&&"admin".equals(lipassword.getText().toString())) {
                    if (cbRemember.isChecked()) {
                        SharedPreferences sp = getSharedPreferences("date", MODE_PRIVATE);
                        SharedPreferences.Editor editor = sp.edit();
                        editor.putString("name", userid.getText().toString());
                        editor.putString("password", lipassword.getText().toString());
                        editor.commit();
                        Toast t1 = Toast.makeText(getApplicationContext(), "登录成功", Toast.LENGTH_SHORT);
                        t1.show();
                    } else {
                        SharedPreferences sp = getSharedPreferences("date", MODE_PRIVATE);
                        SharedPreferences.Editor editor = sp.edit();
                        editor.putString("name", "");
                        editor.putString("password", "");
                        editor.commit();
                        Toast t3 = Toast.makeText(getApplicationContext(), "登录成功，保存失败", Toast.LENGTH_SHORT);
                        t3.show();

                    }
                }
                else {
                    Toast t2 = Toast.makeText(getApplicationContext(), "登录失败", Toast.LENGTH_SHORT);
                    t2.show();
                    userid.setText("");
                    lipassword.setText("");
                }
            }
        });
    }

}

图片