Android制作登录页面并且记住账号密码功能的实现代码

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: 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: 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: 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: 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('data/data/com.hiscene.test/usre.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('data/data/com.hiscene.test/usre.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(); } } }}

总结

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