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Getting parsed object id from onListItemClick

I am currently working on an application that contains a list of friends on login and user profiles. When a user clicks on a friend in the friend list, I would like them to be directed to the profile page for that friend. For this, I am trying to extract the id of a specific object from the user who clicked in the list box, and then pass it to the next action, in which I use it to trigger a request for all other user attributes (name, email, hometown, etc.) ). I figured out how to pass data through intents, but I'm having problems getting the user id from a selected list item. My onItemCLick code is below.

``,

public void onListItemClick(ListView l, View v, int position, long id) {
    super.onListItemClick(l, v, position, id);

    ParseObject item = (ParseObject) l.getAdapter().getItem(position);
    String objectID = item.getObjectId().toString();

    Intent intent = new Intent(getActivity(), FriendsProfileActivity.class);
    intent.putExtra("ID", objectID);
    startActivity(intent);

``,

I also tried something similar to avoid taking advantage.

``,

public void onListItemClick(ListView l, View v, int position, long id) {
     super.onListItemClick(l, v, position, id);

     ParseObject item = (ParseObject) l.getAdapter().getItem(position);
     item.saveInBackground(new SaveCallback() {
         @Override
         public void done(ParseException e) {
             if(e == null) {
                 String objectID = item.getObjectId();
                 Log.e(TAG, objectID);

                 Intent intent = new Intent(getActivity(), FriendsProfileActivity.class);
                 intent.putExtra("ID", objectID);
                 startActivity(intent);
                }
                else {
                    Log.e(TAG, e.getMessage());
                }
            }
        });

    }

``,

In both cases, the app crashes when I click on the user in the list view. How can I successfully remove the object id from the user it clicked on and pass it on?

Edit: Here is the logcat error.

Process: com.richluick.ribbit, PID: 2194 java.lang.ClassCastException: java.lang.String cannot be cast to com.parse.ParseObject at com.richluick.ribbit.FriendsFragment.onListItemClick(FriendsFragment.java:83) at android.support.v4.app.ListFragment$2.onItemClick(ListFragment.java:58) at android.widget.AdapterView.performItemClick(AdapterView.java:299) at android.widget.AbsListView.performItemClick(AbsListView.java:1113) at android.widget.AbsListView$PerformClick.run(AbsListView.java:2904) at android.widget.AbsListView$3.run(AbsListView.java:3638) at android.os.Handler.handleCallback(Handler.java:733) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:136) at android.app.ActivityThread.main(ActivityThread.java:5017) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:515) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595) at dalvik.system.NativeStart.main(Native Method)

Edit: Here is the complete code for the activity, including the request and list adapter. com.richluick.ribbit package;

import android.app.AlertDialog;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ListView;

import com.parse.FindCallback;
import com.parse.ParseException;
import com.parse.ParseObject;
import com.parse.ParseQuery;
import com.parse.ParseRelation;
import com.parse.ParseUser;
import com.parse.SaveCallback;

import java.util.List;

public class FriendsFragment extends android.support.v4.app.ListFragment {

    public static final String TAG = FriendsFragment.class.getSimpleName();

    protected List<ParseUser> mFriends;
    protected ParseRelation<ParseUser> mFriendsRelation;
    protected ParseUser mCurrentUser;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_friends, container, false);
        return rootView;
    }

    @Override
    public void onResume() {
        super.onResume();

        mCurrentUser = ParseUser.getCurrentUser();
        mFriendsRelation = mCurrentUser.getRelation(ParseConstants.KEY_FRIENDS_RELATION);

        getActivity().setProgressBarIndeterminateVisibility(true);

        ParseQuery<ParseUser> query =  mFriendsRelation.getQuery();
        query.addAscendingOrder(ParseConstants.KEY_USERNAME);
        query.findInBackground(new FindCallback<ParseUser>() {
            @Override
            public void done(List<ParseUser> friends, ParseException e) {
                getActivity().setProgressBarIndeterminateVisibility(false);

                if (e == null) {
                    mFriends = friends;

                    String[] usernames = new String[mFriends.size()];
                    int i = 0;
                    for (ParseUser user : mFriends) {
                        usernames[i] = user.getUsername();
                        i++;
                    }
                    ArrayAdapter<String> adapter = new ArrayAdapter<String>(getListView().getContext(),
                    android.R.layout.simple_list_item_1, usernames);
                    setListAdapter(adapter);
                }
                else {
                    Log.e(TAG, e.getMessage());
                    AlertDialog.Builder builder = new AlertDialog.Builder(getListView().getContext());
                    builder.setTitle(R.string.error_title)
                            .setMessage(e.getMessage())
                            .setPositiveButton(android.R.string.ok, null);
                    AlertDialog dialog = builder.create();
                    dialog.show();
                }
            }
        });
    }

    @Override
  public void onListItemClick(ListView l, View v, int position, long id) {
     super.onListItemClick(l, v, position, id);

        final ParseObject item = (ParseObject) l.getAdapter().getItem(position);
        item.saveInBackground(new SaveCallback() {
            @Override
            public void done(ParseException e) {
                if(e == null) {
                    String objectID = item.getObjectId();
                    Log.e(TAG, objectID);

                    Intent intent = new Intent(getActivity(), FriendsProfileActivity.class);
                    intent.putExtra("ID", objectID);
                    startActivity(intent);
                }
                else {
                    Log.e(TAG, e.getMessage());
                }
            }
        });

}

}

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3 answers


Have a look at ParseQueryAdapter

Docs: https://parse.com/docs/android_guide#ui-queryadapter

Tutorial: https://parse.com/tutorials/parse-query-adapter

API: https://parse.com/docs/android/api/com/parse/ParseQueryAdapter.html .

Also I would recommend EventBus to pass the ParseObject for the next action https://github.com/greenrobot/EventBus .

Then you can do:

Adapter:

Intent intent = new Intent(getActivity(), FriendsProfileActivity.class);
EventBus.getDefault().postSticky(YourParseObject);
startActivity(intent);

Anywhere in FriendsProfileActivity:

ParseObject yourParseObject = EventBus.getDefault().getStickyEvent(ParseObject.class);

If you go to using subclasses in parse.com then any subclass can be submitted via EventBus this way.

The example code is untested but should be close to what you want



ParseQueryAdapter:

Layout for R.layout.adapter_item_friend - can be customized, but nothing fancy here

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_margin="5dp"
    android:paddingTop="5dp">


    <TextView
        android:id="@+id/text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_centerVertical="true"
        android:text="item" />

</RelativeLayout>

Adapter:

public class ParseUserFriendsAdapter extends ParseQueryAdapter<ParseUser> {

    private static final String TAG = ParseUserFriendsAdapter.class.getSimpleName();

    public ParseUserFriendsAdapter(Context context) {
        super(context, new ParseQueryAdapter.QueryFactory<ParseUser>() {

            @Override
            public ParseQuery<ParseUser> create() {
                ParseUser currentUser = ParseUser.getCurrentUser();
                ParseRelation<ParseUser> friendsRelation = currentUser.getRelation(ParseConstants.KEY_FRIENDS_RELATION);
                ParseQuery<ParseUser> query =  friendsRelation.getQuery();
                query.addAscendingOrder(ParseConstants.KEY_USERNAME);
                return query;
            }
        });
    }

    @InjectView(R.id.text) TextView text;

    @Override
    public View getItemView(final ParseUser user, View v, ViewGroup parent) {

        if (v == null) {
            v = View.inflate(getContext(), R.layout.adapter_item_friend,
                    null);
        }

        super.getItemView(user, v, parent);

        ButterKnife.inject(this, v);

        text.setText(user.getUsername());


        return v;

    }

}

I am using a normal snippet that has a ListView in it:

R.layout.yourfriendslistlayout:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:animateLayoutChanges="true"
    android:orientation="vertical" >

    <ListView
        android:id="@+id/listview"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:choiceMode="singleChoice"
        android:dividerHeight="1dp" />

</LinearLayout>

Important parts of the code in the snippet:

@Override
public void onCreate(Bundle savedInstanceState) {
    Log.d(TAG, "onCreate");

    mAdapter = new ParseUserFriendsAdapter(getActivity());

    super.onCreate(savedInstanceState);
}

@InjectView(R.id.listview) ListView mListView;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    View rootView = inflater.inflate(
            R.layout.yourfriendslistlayout, container, false);

    ButterKnife.inject(this, rootView);

    /** Setting the list adapter for the ListFragment */
    mListView.setAdapter(mAdapter);
    mListView.setOnItemClickListener(new OnItemClickListener() {

        @Override
        public void onItemClick(AdapterView<?> parent, View view,
                int position, long id) {

            // Now it is easy to get the ParseObject that is clicked
            ParseUser friend = mAdapter.getItem(position);

            Toast.makeText(getActivity(), "clicked " + friend.getObjectId(), Toast.LENGTH_SHORT).show();

            EventBus.getDefault().postSticky(friend);

            Intent intent = new Intent(getActivity(),
                    FriendsProfileActivity.class);
            startActivity(intent);

        }
    });
    return rootView;
}

Additional addition to the snippet code:

/* 
 *This last part automatically sets the load indicator whenever parse performs a query 
 */
private final OnQueryLoadListener<ParseUser> queryListener = new OnQueryLoadListener<ParseUser>() {

    @Override
    public void onLoaded(List<ParseUser> arg0, Exception arg1) {
        getActivity().setProgressBarIndeterminateVisibility(Boolean.FALSE);
    }

    @Override
    public void onLoading() {
        getActivity().setProgressBarIndeterminateVisibility(Boolean.TRUE);
    }
};

@Override
public void onResume() {
    mAdapter.addOnQueryLoadListener(queryListener);
    super.onResume();
}

@Override
public void onPause() {
    mAdapter.removeOnQueryLoadListener(queryListener);
    super.onPause();
}
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Just use the text view on the list item and fill it with the ObjectID of the object in getItemView () of your adapter and set its visibility to View.GONE

Then, in onItemClickListener, call getText () of this text view.



This way you can get the objectId in your method and pass it along with the intent.

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For anyone (beginner) facing this issue nearly 5 years after this question was originally asked; The method proposed by Abhisek Garg, in my opinion, is the simplest and most understandable (for a beginner like me) of all three.

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