CODEWITHSUNDEEP
javaandroidandroid-fragmentsandroid-support-library
jason adams
jason adams

Reputation: 565

Can not cast android.app.fragment

I've seen other posts, and they all suggest that the host activity java file is not extending android.support.v4.app.Fragment. However, I don't know how to make the hosting java file extend android.support.v4.app.Fragment. I've tried adding the dependency to the gradle file but that doesn't work either.

Here's the hosting activity snippet: 

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import course.examples.fragmentstaticlayout.TitlesFragment.ListSelectionListener;

public class QuoteViewerActivity extends Activity implements ListSelectionListener{

    public static String[] mTitleArray;
    public static String[] mQuoteArray;
    private QuotesFragment mDetailsFragment;

    private static final String TAG = "QuoteViewerActivity";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        mTitleArray = getResources().getStringArray(R.array.Titles);
        mQuoteArray = getResources().getStringArray(R.array.Quotes);

        setContentView(R.layout.main);

        mDetailsFragment = (QuotesFragment) getFragmentManager().findFragmentById(R.id.details);
    }

The line in question is the last line of the snippet. And here is my QuotesFragment. 

import android.content.Context;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

public class QuotesFragment extends Fragment {

    private TextView mQuoteView = null;
    private int mCurrIdx = -1;
    private int mQuoteArrayLen;

    private static final String TAG = "QuotesFragment";

    public int getShownIndex() {
        return mCurrIdx;
    }

    public void showQuoteAtIndex(int newIndex) {
        if (newIndex < 0 || newIndex >= mQuoteArrayLen)
            return;
        mCurrIdx = newIndex;
        mQuoteView.setText(QuoteViewerActivity.mQuoteArray[mCurrIdx]);
    }

    @Override
    public void onAttach(Context context){
        Log.i(TAG, getClass().getSimpleName() + ":entered onAttach()");

        super.onAttach(context);

    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        Log.i(TAG, getClass().getSimpleName() + ":entered onCreate()");
        super.onCreate(savedInstanceState);
    }

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

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        mQuoteView = (TextView) getActivity().findViewById(R.id.quoteView);
        mQuoteArrayLen = QuoteViewerActivity.mQuoteArray.length;

    }

Assuming that I'm right about the host activity not extending the support.v4, how would I do this?

Upvotes: 2

Views: 3183

Answers (2)

AAnkit
AAnkit

Reputation: 27549

This is because you are trying to cast Fragment to SupportFragment.

Your QuotesFragment is extending SupportFragment, and while casting you are trying to use FragmentManager and fragment which returns Fragment, not supportFragment.

Try using geSupportFragmentManager instead getFragmentManager.

Also you should extend AppCompatActivity or FragmentActivity instead of Activity for your QuoteViewerActivity

Here is similar question

Upvotes: 4

lodlock
lodlock

Reputation: 3788

Try changing your getFragmentManager() to getSupportFragmentManager() and extending FragmentActivity instead of Activity in your QuoteViewerActivity.

Upvotes: 1

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