哪种方法更适合将大量数据从一个活动传递到另一个活动-Android? [英] Which way is better for pass a large list of data from one activity to another activity - android?

问题描述

我需要将大量数据从一个 activity 传递到另一个 activity ，哪种方法更好?

I need to pass a large list of data from one activity to another activity,which way is better?

第一种方法(例如):

ArrayList<myModel> myList = new ArrayList<myModel>();
intent.putExtra("mylist", myList);

第二种方式(例如):

ActivityTwo act = new ActivityTwo();
act.getDataMethod(listValues);
Intent i = new Intent(this, ActivityTwo.class);
startActivity(i);

然后在另一个 activity (ActivityTwo)中，我从 getDataMethod 获取数据.

And in another activity(ActivityTwo) I get data from getDataMethod.

推荐答案

在Android中将大型数据列表从一个Activity传递到另一个Activity的最佳方法是Parcelable.您首先创建Parcelable pojo类，然后创建Array-List并将其传递给键和值对之类的bundle，然后将bundle传递给intent extras.

Best way to pass large data list from one Activity to another in Android is Parcelable . You first create Parcelable pojo class and then create Array-List and pass into bundle like key and value pair and then pass bundle into intent extras.

下面，我放一个示例User Pojo类，该类实现了Parcelable接口.

Below I put one sample User Pojo class that implements Parcelable interface.

import android.os.Parcel;
import android.os.Parcelable;
/**
 * Created by CHETAN JOSHI on 2/1/2017.
 */

public class User implements Parcelable {

    private String city;
    private String name;
    private int age;


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

    public User(){
        super();
    }

    public String getCity() {
        return city;
    }

    public void setCity(String city) {
        this.city = city;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    @SuppressWarnings("unused")
    public User(Parcel in) {
        this();
        readFromParcel(in);
    }

    private void readFromParcel(Parcel in) {
        this.city = in.readString();
        this.name = in.readString();
        this.age = in.readInt();
    }

    public int describeContents() {
        return 0;
    }

    public final Parcelable.Creator<User> CREATOR = new Parcelable.Creator<User>() {
        public User createFromParcel(Parcel in) {
            return new User(in);
        }

        public User[] newArray(int size) {
            return new User[size];
        }
    };


    @Override
    public void writeToParcel(Parcel dest, int flags) {
        dest.writeString(city);
        dest.writeString(name);
        dest.writeInt(age);
    }
}
ArrayList<User> info = new ArrayList<User>();
info .add(new User("kolkata","Jhon",25));
info .add(new User("newyork","smith",26));
info .add(new User("london","kavin",25));
info .add(new User("toranto","meriyan",30));

Intent intent = new Intent(MyActivity.this,NextActivity.class);
Bundle bundle = new Bundle();
bundle.putParcelableArrayList("user_list",info );
intent.putExtras(bundle);`
startActivity(intent );

这篇关于哪种方法更适合将大量数据从一个活动传递到另一个活动-Android?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！