Android development Intent jump pass list collection implementation example

introduction

Normal values are passed between two activities on Android, such as: a single String, int... I won't say much
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Pass list collection

Note: List value passed by entity classes are serialized

Create an entity class first (for testing below)

import ;
//Don't forget to serialize Serializablepublic class DemoBean implements Serializable {
    String xm;
    int age;
    public String getXm() {
        return xm;
    }
    public void setXm(String xm) {
         = xm;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
         = age;
    }
}

The first activity

//Write a test method    public void ToJump(){
        List&amp;lt;DemoBean&amp;gt; list=new ArrayList&amp;lt;&amp;gt;();
        //Add 5 pieces of data to list        for (int i=0;i&amp;lt;5;i++){
            DemoBean demoBean=new DemoBean();
            ("Flower Flower"+i);
            (i);
            (demoBean);
        }
        Intent intent=new Intent(this,);
        ("list", (Serializable) list);
        startActivity(intent);
    }

The second activity page receives

 Intent intent=getIntent();
 List&lt;DemoBean&gt; list= (List&lt;DemoBean&gt;) ("list");
 ("TAG","---"+());// ()==5

Passing ArrayList collection

Passing ArrayList collection is the same as list

Note: Entity classes are serialized

The first activity

    public void ToJump(){
        ArrayList&amp;lt;DemoBean&amp;gt; arrayList=new ArrayList();
        for (int i=0;i&amp;lt;5;i++){
            DemoBean demoBean=new DemoBean();
            ("Flower Flower"+i);
            (i);
            (demoBean);
        }
        Intent intent=new Intent(this,);
        ("arrayList",arrayList);
        startActivity(intent);
    }

The second activity page receives

Intent intent=getIntent();
ArrayList&amp;lt;DemoBean&amp;gt; arrayList= (ArrayList&amp;lt;DemoBean&amp;gt;) ("arrayList");
("TAG","--------"+());// There are 5 data ()==5

Passing entity class

The first activity

public void ToJump(){
    DemoBean demoBean=new DemoBean();
    Intent intent=new Intent(this,);
    ("demoBean",demoBean);
    startActivity(intent);
}

The second activity page receives

Intent intent=getIntent();
DemoBean demoBean= (DemoBean) ("demoBean");
//Received an entire entity class

Pass String

The first activity

 Intent intent = new Intent(this,);
 //Set the pass key-value pair ("name","Flower Flower");
 //Activate Intent startActivity(intent);

The second activity page receives

 Intent intent = getIntent();
 //Get the passed value String name= ("name");
 //The value of name is: Huahua

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