Android [SharedPreference轻量级存储]

package com.xdw.a122.data;

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.EditText;
import android.widget.TextView;

import com.xdw.a122.R;

public class SharedPreferencesActivity extends AppCompatActivity {
    private EditText mEtName;
    private Button mBtnSave,mBtnShow;
    private TextView mTvContent;
    private SharedPreferences mSharedPreferences;
    private SharedPreferences.Editor mEditor;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_shared_preferences);
        mEtName=findViewById(R.id.et_name);
        mBtnSave=findViewById(R.id.btn_save);
        mBtnShow=findViewById(R.id.btn_show);
        mTvContent=findViewById(R.id.tv_show);

        mSharedPreferences=getSharedPreferences("data",MODE_PRIVATE);  //名称和类型
        mEditor=mSharedPreferences.edit();

        mBtnSave.setOnClickListener(new View.OnClickListener() {     //存储
             @Override
            public void onClick(View v) {
             mEditor.putString("name",mEtName.getText().toString());
             //此处写要提交的内容
                mEditor.apply();
                //or commit()； 存储完成
            }
        });
        mBtnShow.setOnClickListener(new View.OnClickListener() {            //读取
            @Override
            public void onClick(View v) {
                mTvContent.setText(mSharedPreferences.getString("name",""));
            }
        });
    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
    android:orientation="vertical"
    tools:context=".data.SharedPreferencesActivity">
    <EditText
        android:id="@+id/et_name"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="输入内容"
        />
    <Button
        android:id="@+id/btn_save"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="保存"
        android:layout_marginTop="10dp"/>
    <Button
        android:id="@+id/btn_show"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="显示"/>
    <TextView
        android:id="@+id/tv_show"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"/>
</LinearLayout>

mSharedPreferences=getSharedPreferences("data",MODE_PRIVATE);  //名称和类型
        mEditor=mSharedPreferences.edit();