【Android Studio】数据持久化（二）SharedPreferences

package com.example.myapplication;

import androidx.appcompat.app.AppCompatActivity;

import android.content.SharedPreferences;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button button=findViewById(R.id.button1);
        Button button2=findViewById(R.id.button2);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //创建一个编辑对象
                SharedPreferences.Editor editor=
                        getSharedPreferences("data",MODE_PRIVATE).edit();
                //添加数据
                editor.putString("name","Tom");
                editor.putInt("Age",18);
                editor.putBoolean("married",false);
                //提交文件
                editor.apply();
            }
        });
        button2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //创建一个SharePreferences对象
                SharedPreferences pref=getSharedPreferences("data",MODE_PRIVATE);
                //通过这个对象获取数据
                String name = pref.getString("Name", "_ _");
                int age = pref.getInt("Age", 500);
                boolean married = pref.getBoolean("married", true);
                //打印数据
                Log.d("MainActivity",name);
                Log.d("MainActivity",""+age);
                Log.d("MainActivity",""+married);
            }
        });
    }
}