(android)Serializable 和Parcelable区别和写法

User.java

package com.example.hp.learn2video;

import android.os.Parcel;
import android.os.Parcelable;

import java.io.Serializable;

/**
 * Created by HP on 2018/10/18.
 */
//简单但是效率低
public class Userx implements Serializable {
    private String name;
    private int age;

    public String getn() {
        return name;
    }

    public int getAge() {
        return age;
    }

    public User(String name, int age) {
        this.name = name;
        this.age = age;
    }
}





    public class User implements Parcelable {//效率更高
        private String name;
        private int age;

        public String getn()
        {
            return name;
        }
        public  int getAge()
        {
            return age;
        }
        public  User(String name,int age )
        {
            this.name=name;
            this.age=age;
        }

    @Override
    public int describeContents() {
        return 0;
    }

    @Override
    public void writeToParcel(Parcel dest, int flags) {
        dest.writeString(getn());
        dest.writeInt(getAge());

    }

    public static final Creator<User> CREATOR = new Creator<User>() {
        public User createFromParcel(Parcel source){
            //如过内容过多可以使用bundle    Bundle
           return new User(source.readString(),source.readInt());
        }
        public User[] newArray(int size){
            return new User[size];
        }
    };

}

 

 

 

 

 

Main2Activity

package com.example.hp.learn2video;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;

public class Main2Activity extends AppCompatActivity {
    private TextView tv;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);
        tv=findViewById(R.id.textView);

        Intent i=getIntent();
        User user= (User) i.getParcelableExtra("user");

     //   Bundle b=i.getBundleExtra("key");
        tv.setText(String.format("string:%s,time%d",user.getn(),user.getAge()));
    }
}

 

 

MainActivity

package com.example.hp.learn2video;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        System.out.println("onCreat");

        findViewById(R.id.button).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                System.out.println("sadadasdasd"+51);
                Intent i= new Intent(MainActivity.this,Main2Activity.class);
               // i.putExtra("key","23323");
//                Bundle b =new Bundle();
//                b.putInt("time",112233);
//                b.putString("key","dasdasdsadasd");
            //    i.putExtra("key",b);
                 i.putExtra("user", new User("dasda", 15));
                startActivity(i);
            }
        });
    }

    protected  void  onStart()
    {
        super.onStart();
        System.out.println("onStart");
    }

    protected  void  onResume()
    {
        super.onResume();
        System.out.println("onResume");
    }
    protected  void  onPause()
    {
        super.onPause();
        System.out.println("onPause");
    }

    protected  void  onStop()
    {
        super.onStop();
        System.out.println("onStop");
    }

    protected  void  onDestroy()
    {
        super.onDestroy();
        System.out.println("onDestroy");
    }

    protected  void  onRestart()
    {
        super.onRestart();
        System.out.println("onRestart");
    }




}