简易的QQ登陆界面

登陆界面

package com.example.admin.loginqq;

import android.content.Intent;
import android.content.SharedPreferences;
import android.preference.PreferenceManager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
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 {

    private static final String TAG = "MainActivity";

    private EditText editText1,editText2;

    private CheckBox checkBox;

    private Button register,login;

    private SharedPreferences.Editor editor;

    private SharedPreferences pref;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        pref = PreferenceManager.getDefaultSharedPreferences(this);
        editText1 = findViewById(R.id.editText1);
        editText2 = findViewById(R.id.editText2);
        checkBox = findViewById(R.id.rememberPsd);
        register = findViewById(R.id.register);
        login = findViewById(R.id.login);
//定义一个布尔型记住密码
        boolean isRemember = pref.getBoolean("remember_password",false);
这里需要注意if()里面要判断之前储存的checkbox值,之前写的是if(isRemember),导致无法记住密码

        if (pref.getBoolean("remember_password",true){
            String username = pref.getString("username","");
            String password = pref.getString("password","");
            editText1.setText(username);
            editText2.setText(password);
            checkBox.setChecked(true);
        }

//注册按钮

        register.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(MainActivity.this,register.class);
                startActivity(intent);
            }
        });

//登录按钮

        login.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

//读取输入的账号和密码
                String inputText1 = editText1.getText().toString().trim();
                String inputText2 = editText2.getText().toString().trim();

//读取注册的账号和密码
                SharedPreferences pref = getSharedPreferences("data",MODE_PRIVATE);
                String username = pref.getString("username","");
                String password = pref.getString("password","");

//判断输入的账号和密码是否与注册的账号密码一致

               if (inputText1.equals(username) && inputText2.equals(password)){
                    editor = pref.edit();
                    if (checkBox.isChecked()){
                        editor.putBoolean("remember_password",true);
                        editor.putString("username",username);
                        editor.putString("password",password);
                        Toast.makeText(MainActivity.this, "登录成功", Toast.LENGTH_SHORT).show();
                    }else{
                        editor.clear();
                    }

//勾选记住密码后,将账号密码以及记住密码的数据提交,以便进入程序后能够看到记住密码的功能
                    editor.apply();

//显示登录成功后退出程序,可以再次进入程序看是否显示密码
                    finish();
                }else{
                    Toast.makeText(MainActivity.this, "账号或者密码输入错误", Toast.LENGTH_SHORT).show();
                }
            }
        });
    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity"
    android:orientation="vertical"
    android:background="#ffffff">
        <EditText
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/editText1"
            android:layout_marginLeft="20dp"
            android:layout_marginRight="20dp"
            android:hint="QQ号/手机号/邮箱"
            android:textColorHint="#949494"
            />
        <EditText
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/editText2"
            android:layout_marginLeft="20dp"
            android:layout_marginRight="20dp"
            android:hint="密码"
            android:textColorHint="#949494"/>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">
        <CheckBox
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="记住密码"
            android:id="@+id/rememberPsd"
            android:layout_marginLeft="20dp"
            android:textColor="#25b6ed"/>

        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="新用户注册"
            android:id="@+id/register"
            android:layout_marginLeft="165dp"
            android:background="@android:color/transparent"
            android:textColor="#25b6ed"/>
    </LinearLayout>

    <Button
        android:id="@+id/login"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="登陆"
        android:background="#25b6ed"
        android:layout_marginLeft="20dp"
        android:layout_marginRight="20dp"
        android:textColor="#ffffff"/>
</LinearLayout>

注册界面

package com.example.admin.loginqq;

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.EditText;
import android.widget.Toast;

public class register extends AppCompatActivity {

    private EditText editText1,editText2,editText3;

    private Button button;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_register);
        editText1 = findViewById(R.id.editText1);
        editText2 = findViewById(R.id.editText2);
        editText3 = findViewById(R.id.editText3);
        button = findViewById(R.id.register);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String inputText1 = editText1.getText().toString().trim();
                String inputText2 = editText2.getText().toString().trim();
                String inputText3 = editText3.getText().toString().trim();
                if (inputText2.equals(inputText3)){
                    SharedPreferences.Editor editor = getSharedPreferences("data",MODE_PRIVATE).edit();
                    editor.putString("username",inputText1);
                    editor.putString("password",inputText2);
                    editor.apply();
                    Toast.makeText(register.this, "恭喜您,注册成功,返回登录界面", Toast.LENGTH_LONG).show();
                    finish();
                }else{
                    Toast.makeText(register.this, "两次输入的密码不同", Toast.LENGTH_SHORT).show();
                }
            }
        });
    }
}

<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"
    tools:context=".register"
    android:orientation="vertical">

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/editText1"
        android:layout_marginLeft="20dp"
        android:layout_marginRight="20dp"
        android:hint="请输入您需要注册的账号"
        android:textColorHint="#949494"
        />
    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/editText2"
        android:layout_marginLeft="20dp"
        android:layout_marginRight="20dp"
        android:hint="请输入您需要注册的密码"
        android:textColorHint="#949494"/>

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/editText3"
        android:layout_marginLeft="20dp"
        android:layout_marginRight="20dp"
        android:hint="再次确认您输入的密码"
        android:textColorHint="#949494"/>

    <Button
        android:id="@+id/register"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="注册"
        android:background="#25b6ed"
        android:layout_marginLeft="20dp"
        android:layout_marginRight="20dp"
        android:textColor="#ffffff"/>


</LinearLayout>