先看下效果圖：

該介面的佈局檔案為：

<?xml version="1.0" encoding="utf-8"?>
<TableLayout 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"
    android:stretchColumns="1"
    android:layout_marginLeft="10dp"
    android:layout_marginRight="10dp"
    android:layout_marginTop="10dp"
    tools:context="xjtu.com.rememberpwd.MainActivity">

    <TableRow>
        <TextView android:text="賬號："
            android:paddingLeft="30dp"/>
        <EditText android:id="@+id/username"
            android:background="@drawable/et_shape"/>
    </TableRow>

    <TableRow android:layout_marginTop="10dp">

        <TextView android:text="密碼："
            android:paddingLeft="30dp"/>
        <EditText android:id="@+id/password"
            android:background="@drawable/et_shape"
            android:inputType="textPassword"/>
    </TableRow>

    <TableRow android:layout_marginTop="10dp">

        <CheckBox android:id="@+id/chk"
            android:text="記住密碼"/>
        <Button android:id="@+id/btn_login"
            android:background="@drawable/btn_shape"
            android:text="登入"/>

    </TableRow>

</TableLayout>
 

import android.content.Intent;
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.CheckBox;
import android.widget.EditText;

public class MainActivity extends AppCompatActivity {

    private Button btn_login;
    private EditText username,password;
    private CheckBox chk;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
        restoreInfo();
    }

    private void initView(){
        btn_login=(Button)findViewById(R.id.btn_login);
        username=(EditText)findViewById(R.id.username);
        password=(EditText)findViewById(R.id.password);
        chk=(CheckBox)findViewById(R.id.chk);

        btn_login.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (chk.isChecked()){
                    String usr=username.getText().toString();
                    String pwd=password.getText().toString();
                    memInfo(usr,pwd);
                }else{
                    SharedPreferences.Editor et=getSharedPreferences("data",0).edit();
                    et.clear();
                    et.commit();
                }
                Intent intent=new Intent(MainActivity.this,LoginSuccess.class);
                startActivity(intent);
            }
        });


    }

    private void memInfo(String usr,String pwd){
        SharedPreferences.Editor editor=getSharedPreferences("data",0).edit();
        editor.putString("username",usr);
        editor.putString("password",pwd);
        editor.commit();
    }

    private void restoreInfo(){
        SharedPreferences sp=getSharedPreferences("data",0);
        username.setText(sp.getString("username",""));
        password.setText(sp.getString("password",""));
    }

}