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

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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