Intent jump pass list set

• Android Two activity Common value transfer between Such as ： Single String ,int … Not much
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The following is about transmission list aggregate

Be careful ：list The entity classes that pass values are serialized

• First create an entity class （ For test later ）

import java.io.Serializable;
// Don't forget to serialize  Serializable 
public class DemoBean implements Serializable {
    
    String xm;
    int age;

    public String getXm() {
    
        return xm;
    }

    public void setXm(String xm) {
    
        this.xm = xm;
    }

    public int getAge() {
    
        return age;
    }

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

• first activity

// Write a test method 
    public void ToJump(){
    
        List<DemoBean> list=new ArrayList<>();
        // to list  add to  5  Data 
        for (int i=0;i<5;i++){
    
            DemoBean demoBean=new DemoBean();
            demoBean.setXm(" tearful "+i);
            demoBean.setAge(i);
            list.add(demoBean);
        }
        Intent intent=new Intent(this,MainActivity.class);
        intent.putExtra("list", (Serializable) list);
        startActivity(intent);
    }

• the second activity Page to receive

 Intent intent=getIntent();
 List<DemoBean> list= (List<DemoBean>) intent.getSerializableExtra("list");
 Log.e("TAG","---"+list.size());// list.size()==5

Pass on ArrayList The collection and list equally

Be careful ： Entity classes are serialized

• first activity

    public void ToJump(){
    
        ArrayList<DemoBean> arrayList=new ArrayList();
        for (int i=0;i<5;i++){
    
            DemoBean demoBean=new DemoBean();
            demoBean.setXm(" tearful "+i);
            demoBean.setAge(i);
            arrayList.add(demoBean);
        }
        Intent intent=new Intent(this,MainActivity.class);
        intent.putExtra("arrayList",arrayList);
        startActivity(intent);
    }

• the second activity Page to receive

Intent intent=getIntent();
ArrayList<DemoBean> arrayList= (ArrayList<DemoBean>) intent.getSerializableExtra("arrayList");
Log.e("TAG","--------"+arrayList.size());//  Yes 5 Data  list.size()==5

• That's all