Android开发Activity之间传值的四种方式

一、通过putExtra传值

传送：

Intent intent = new Intent(this,MainActivity2.class);
intent.putExtra("name","xupeng");
startActivity(intent);

接收：

Intent intent = this.getIntent();
 Log.e(TAG, "onCreate: "+intent.getStringExtra("name"));

二、通过Bundle方式传值

传送：

Intent intent = new Intent(this,MainActivity2.class);
Bundle bundle = new Bundle();
bundle.putString("name","xupeng");
bundle.putInt("age",18);
intent.putExtras(bundle);
startActivity(intent);

接收：

Intent intent = this.getIntent();
Bundle bundle = intent.getExtras();
Log.e(TAG, "onCreate: "+bundle.getString("name") + "   "+bundle.getInt("age") );

三、通过Serializable方式传值

新建一个类实现Serializable接口

public class Data implements Serializable {
    public int id;
    public String name;
    public int age;

    @Override
    public String toString() {
        return "Data{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", age=" + age +
                '}';
    }
}

传送：

Intent intent = new Intent(this,MainActivity2.class);
Data d = new Data();
d.id=100;
d.name="xupeng";
d.age=100;
intent.putExtra("data",d);
startActivity(intent);

接收：

Intent intent = this.getIntent();
Serializable data = intent.getSerializableExtra("data");
 Log.e(TAG, "onCreate: "+data.toString() );

四、通过Parcelable方式传值

新建一个类实现Parcelable接口

package com.example.learning01;

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

import java.io.Serializable;

public class Data2 implements Parcelable {
    //成员
    public int id;
    public String name;
    public int age;
    //构造函数
    protected Data2(Parcel in) {
        //从parcel读取存入对象
        id = in.readInt();
        name = in.readString();
        age = in.readInt();
    }

    public Data2() {

    }

    //自动生成
    public static final Creator<Data2> CREATOR = new Creator<Data2>() {
        //把Data2对象构建好传递给parcel
        @Override
        public Data2 createFromParcel(Parcel in) {
            return new Data2(in);
        }

        @Override
        public Data2[] newArray(int size) {
            return new Data2[size];
        }
    };

    @Override
    public int describeContents() {
        return 0;
    }
    //把属性写入到parcel里面去
    @Override
    public void writeToParcel(Parcel parcel, int i) {
        parcel.writeInt(id);
        parcel.writeString(name);
        parcel.writeInt(age);
    }

    @Override
    public String toString() {
        return "Data2{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", age=" + age +
                '}';
    }
}

传送：

Intent intent = new Intent(this,MainActivity2.class);
Data2 d = new Data2();
d.id=1000;
d.name="dddd";
d.age=200;

intent.putExtra("data2",d);
startActivity(intent);

接收：

Intent intent = this.getIntent();
Parcelable data2 = intent.getParcelableExtra("data2");
Log.e(TAG, "onCreate: "+data2.toString() );