Android登录页面制作并且记住账号密码_android studio

一、页面搭建

<?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">

<EditText
android:id="@+id/et_UserName"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginLeft="16dp"
android:layout_marginTop="32dp"
android:layout_marginEnd="16dp"
android:layout_marginRight="16dp"
android:ems="10"
android:hint="请输入账号"
android:inputType="textPersonName"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />

<EditText
android:id="@+id/et_Password"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginLeft="16dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="16dp"
android:layout_marginRight="16dp"
android:ems="10"
android:hint="请输入密码"
android:inputType="textPassword"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/et_UserName" />

<CheckBox
android:id="@+id/checkBox"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="16dp"
android:text="记住密码"
app:layout_constraintStart_toStartOf="@+id/et_Password"
app:layout_constraintTop_toBottomOf="@+id/et_Password" />

<Button
android:id="@+id/button"
android:onClick="Login"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="24dp"
android:layout_marginLeft="24dp"
android:layout_marginEnd="24dp"
android:layout_marginRight="24dp"
android:text="安全登录"
app:layout_constraintBottom_toBottomOf="@+id/checkBox"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toEndOf="@+id/checkBox"
app:layout_constraintTop_toTopOf="@+id/checkBox" />


</android.support.constraint.ConstraintLayout>

二、代码实现

package com.hiscene.test;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.Toast;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;

public class MainActivity extends AppCompatActivity {

EditText et_userName;
EditText et_password;
CheckBox checkBox;

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

et_userName = findViewById(R.id.et_UserName);
et_password = findViewById(R.id.et_Password);
checkBox = findViewById(R.id.checkBox);

LoadInfo();
}

private void LoadInfo()
{
File file=new File(MainActivity.this.getFilesDir(),"data.txt");
if (!file.exists()) return;

try {
FileReader reader = new FileReader(file);
BufferedReader br=new BufferedReader(reader);
String text=br.readLine();
String[] arr=text.split("#");
et_userName.setText(arr[0]);
et_password.setText(arr[1]);
checkBox.setChecked(true);
br.close();

}catch (Exception e) {
e.printStackTrace();
}

}

public void Login(View view) {

String userName=et_userName.getText().toString().trim();
String password= et_password.getText().toString().trim();

if (TextUtils.isEmpty(userName)|| TextUtils.isEmpty(password))
{
Toast.makeText(MainActivity.this, "用户名或密码不能为空!", Toast.LENGTH_SHORT).show();
return;
}

if (checkBox.isChecked())
{
File file=new File(MainActivity.this.getFilesDir(),"data.txt");
try {

OutputStream out=new FileOutputStream(file);
OutputStreamWriter osw=new OutputStreamWriter(out,"UTF-8");
BufferedWriter writer=new BufferedWriter(osw);
writer.write(userName+"#"+password);
writer.flush();
writer.close();

} catch (Exception e) {
e.printStackTrace();
}

}

}
}