Android实现关机后数据不会丢失问题

package com.example.applicationtest04;

import android.app.Application;
import android.content.Context;
import android.content.SharedPreferences;

import androidx.annotation.NonNull;
import androidx.lifecycle.AndroidViewModel;
import androidx.lifecycle.LiveData;
import androidx.lifecycle.MutableLiveData;
import androidx.lifecycle.SavedStateHandle;

public class MyVIewModel extends AndroidViewModel {
 SavedStateHandle handle; //声明savedstatehandle 类型
 String shpName = getApplication().getResources().getString(R.string.shp_name);
 String key = getApplication().getResources().getString(R.string.key);
 public MyVIewModel(@NonNull Application application, SavedStateHandle handle) {
  super(application);
  this.handle = handle;
  if(!handle.contains(key)){
   load();
  }
 }
 public LiveData getNumber(){
  return handle.getLiveData(key);
 }
 public void load(){
  SharedPreferences shp = getApplication().getSharedPreferences(shpName, Context.MODE_PRIVATE);
  int x = shp.getInt(key,0);
  handle.set(key,x);

 }
 public void save(){
  SharedPreferences shp = getApplication().getSharedPreferences(shpName,Context.MODE_PRIVATE);
  SharedPreferences.Editor editor = shp.edit();
  editor.putInt(key,getNumber().getValue());
  editor.apply();
 }
 public void add(int x){
  handle.set(key,getNumber().getValue()+x);
 }
}
//这段代码里面有几个重要的点就是在使用handle的时候要注意使用的数据是liveData

package com.example.applicationtest04;

import androidx.appcompat.app.AppCompatActivity;
import androidx.databinding.DataBindingUtil;
import androidx.lifecycle.SavedStateVMFactory;
import androidx.lifecycle.ViewModelProvider;
import androidx.lifecycle.ViewModelProviders;

import android.os.Bundle;

import com.example.applicationtest04.databinding.ActivityMainBinding;

public class MainActivity extends AppCompatActivity {
 MyVIewModel myVIewModel;
 ActivityMainBinding binding;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  binding = DataBindingUtil.setContentView(this,R.layout.activity_main);
  this.myVIewModel = ViewModelProviders.of(this,new SavedStateVMFactory(this)).get(MyVIewModel.class);
  binding.setData(myVIewModel);
  binding.setLifecycleOwner(this);
 }

 @Override
 protected void onPause() {
  super.onPause();
  myVIewModel.save();
 }
}
//这段代码的重点就是使用onPause这个声明周期的函数来调用save()函数

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