Question

在GridView或简单的ListView中，我使用此代码将对象传递给新活动，并且它可以正常工作：

gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            Illusion i = (Illusion) parent.getItemAtPosition(position);
            Intent intent = new Intent(IllusionsGridActivity.this, ViewIllusionActivity.class);
            intent.putExtra("item", i);
            startActivity(intent);
        }
    });

我试图在可扩展列表中对子对象执行相同操作，但它不起作用。它似乎只接受String值。所以这不起作用：

listView.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {
        @Override
        public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id) {
            Illusion i = (Illusion) parent.getItemAtPosition(childPosition);
            Intent intent = new Intent(IllusionsListActivity.this, ViewIllusionActivity.class);
            intent.putExtra("item", i);
            startActivity(intent);
            return false;
        }
    });

有没有办法将整个对象传递给此方法中的新活动？

Answer 1

尝试下一个代码：

listView.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {
    @Override
    public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id) {
        long packedPosition = ExpandableListView.getPackedPositionForChild(groupPosition, childPosition);
        int flatPosition = parent.getFlatListPosition(packedPosition)
        Illusion i = (Illusion) parent.getItemAtPosition(flatPosition);
        Intent intent = new Intent(IllusionsListActivity.this, ViewIllusionActivity.class);
        intent.putExtra("item", i);
        startActivity(intent);
        return false;
    }
});

Answer 2

尝试使用Parcable。

在第一个Activtiy中

Illusion i = (Illusion) parent.getItemAtPosition(position);
Intent in = new Intent(IllusionsGridActivity.this,ViewIllusionActivity.class);
in.putExtra("key", i);
startActivity(in);

在第二个Activtiy中

Intent intent = getIntent();
User usr = (User) intent.getParcelableExtra("key");

在幻觉课程中

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

public class User implements Parcelable {

    private long exampleValueLong;
    private int exampleValueInt;
    private String exampleValueString;
    private boolean exampleValueBool; 

    public User(){}

    // all getters and setters go here //...


    @Override
    public int describeContents() {
      // ignore for now
    return 0;
    }

    @Override
    public void writeToParcel(Parcel pc, int flags) {
        pc.writeLong(exampleValueLong);
        pc.writeInt(exampleValueInt);
        pc.writeString(exampleValueString);
        pc.writeInt( exampleValueBool ? 1 :0 );
   }

    public static final Parcelable.Creator<User> CREATOR = 
        new Parcelable.Creator<Illusion>() {

         public Illusion createFromParcel(Parcel pc) {
             return new Illusion(pc);
         }

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

   public Illusion(Parcel pc){
       exampleValueLong = pc.readLong();
       exampleValueInt  =  pc.readInt();
       exampleValueString  = pc.readString();
       exampleValueBool= ( pc.readInt() == 1 );
  }
}

如何在ExpandableListView中将整个对象传递给onChildClick中的intent

2 个答案: