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();