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("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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