How to pass target targets to onChildClick in ExpandableListView
In a GridView or a simple ListView, I use this code to pass an object to a new activity and it works great:
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);
}
});
I am trying to do the same on Expandable list for child objects, but it doesn't work. It seems to only accept String values. So this doesn't work:
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;
}
});
Is there a way to pass the entire object to a new activity inside this method?
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2 answers
Try the following code:
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;
}
});
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Try using Parcable.
In the first Activtiy
Illusion i = (Illusion) parent.getItemAtPosition(position);
Intent in = new Intent(IllusionsGridActivity.this,ViewIllusionActivity.class);
in.putExtra("key", i);
startActivity(in);
In the second Activtiy
Intent intent = getIntent();
User usr = (User) intent.getParcelableExtra("key");
In the Illusion class
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 );
}
}
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