SharedPreferences使用demo

package com.example.helloworld;

import android.annotation.SuppressLint;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentTransaction;

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;

public class MyfragmentActivity extends AppCompatActivity {
    SimpleDateFormat sf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.myfragment);
        init1();
    }

    public void init1() {
        MyFragment2 f=new MyFragment2();
        Bundle b=new Bundle();
        b.putString("name","张三");
        f.setArguments(b);

        FragmentManager fm = getSupportFragmentManager();
        FragmentTransaction ft = fm.beginTransaction();

        ft.add(R.id.rl_fragment,f);
        ft.addToBackStack(null);
        ft.commit();

        findViewById(R.id.myfragment).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                SharedPreferences sp = getSharedPreferences("sp", MODE_PRIVATE);
                SharedPreferences.Editor edit = sp.edit();
                edit.putString("time", sf.format(new Date()));
                if(edit.commit()){
                    Toast.makeText(getApplicationContext(),"success",Toast.LENGTH_SHORT).show();
                }
            }
        });
        
        findViewById(R.id.rl_fragment).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                SharedPreferences sp = getSharedPreferences("sp",MODE_PRIVATE);
                String time = sp.getString("time", "--");
                TextView tv = findViewById(R.id.parent_textview_id);
                tv.setText(time+"");
            }
        });
    }

}

本文地址：https://blog.csdn.net/weixin_43292547/article/details/110558698