SharedPreferences存儲 首選項存儲

package com.zdsoft.sharedpreferces1207;

import android.content.Context;
import android.content.SharedPreferences;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.CheckBox;
import android.widget.EditText;

public class MainActivity extends AppCompatActivity {
    private EditText et_user, et_password;
    private CheckBox cb_remember;
    private final String INFO = "info";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
        read();
    }

    @Override
    protected void onPause() {
        super.onPause();
        write();
    }

    //實例化控件
    private void initView() {
        et_user = (EditText) findViewById(R.id.et_user);
        et_password = (EditText) findViewById(R.id.et_password);
        cb_remember = (CheckBox) findViewById(R.id.cb_remember);
    }

    //文件寫入
    private void write() {
        //獲得SharedPreferences對象
        SharedPreferences sharedPreferences = getSharedPreferences(INFO, Context.MODE_PRIVATE);
        //獲得SharedPreferences.Editor對象
        SharedPreferences.Editor editor = sharedPreferences.edit();
        if (cb_remember.isChecked()) {
            editor.putString("user", et_user.getText().toString());
            editor.putString("password", et_password.getText().toString());
            editor.putBoolean("checked", cb_remember.isChecked());
        } else {
            editor.putString("user", "");
            editor.putString("password", "");
            editor.putBoolean("checked", false);
        }
        editor.commit();
    }

    //文件讀取
    private void read() {
        SharedPreferences sharedPreferences = getSharedPreferences(INFO, Context.MODE_PRIVATE);

        String user = sharedPreferences.getString("user", "");
        String password = sharedPreferences.getString("password", "");
        boolean checked = sharedPreferences.getBoolean("checked", false);

        et_user.setText(user);
        et_password.setText(password);
        cb_remember.setChecked(checked);

    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="用戶名：" />

        <EditText
            android:id="@+id/et_user"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="請輸入用戶名" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="密碼：" />

        <EditText
            android:id="@+id/et_password"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="請輸入密碼"
            android:inputType="textPassword" />
    </LinearLayout>

    <CheckBox
        android:id="@+id/cb_remember"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="記住用戶名及密碼" />


</LinearLayout>