package com.github.jberkel.payme;

import android.os.AsyncTask;
import org.jetbrains.annotations.Nullable;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import static com.github.jberkel.payme.Response.OK;

public class ConsumeTask extends AsyncTask<Purchase, Void, List<IabResult>> {
    private final IabHelper mIabHelper;
    private final OnConsumeFinishedListener mSingleListener;
    private final OnConsumeMultiFinishedListener mMultiListener;
    private List<Purchase> mPurchases;

    public ConsumeTask(IabHelper iabHelper,
                       @Nullable OnConsumeFinishedListener singleListener,
                       @Nullable OnConsumeMultiFinishedListener multiListener) {
        mIabHelper = iabHelper;
        mSingleListener = singleListener;
        mMultiListener = multiListener;
    }

    @Override
    protected void onPreExecute() {
        mIabHelper.flagStartAsync("consume");
    }

    @Override
    protected List<IabResult> doInBackground(final Purchase... purchases) {
        if (purchases == null || purchases.length == 0) throw new IllegalArgumentException("no purchases");

        mPurchases = new ArrayList<Purchase>(purchases.length);
        Collections.addAll(mPurchases, purchases);

        final List<IabResult> results = new ArrayList<IabResult>();
        for (Purchase purchase : purchases) {
            try {
                mIabHelper.consume(purchase);
                results.add(new IabResult(OK, "Successful consume of sku " + purchase.getSku()));
            } catch (IabException ex) {
                results.add(ex.getResult());
            }
        }
        return results;
    }

    @Override
    protected void onPostExecute(List<IabResult> results) {
        mIabHelper.flagEndAsync();
        if (mIabHelper.isDisposed() || isCancelled()) return;

        if (mSingleListener != null) {
            mSingleListener.onConsumeFinished(mPurchases.get(0), results.get(0));
        }

        if (mMultiListener != null) {
            mMultiListener.onConsumeMultiFinished(mPurchases, results);
        }
    }
}

package com.github.jberkel.payme;

import android.os.AsyncTask;
import org.jetbrains.annotations.Nullable;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import static com.github.jberkel.payme.Response.OK;

public class ConsumeTask extends AsyncTask<Purchase, Void, List<IabResult>> {
    private final IabHelper mIabHelper;
    private final OnConsumeFinishedListener mSingleListener;
    private final OnConsumeMultiFinishedListener mMultiListener;
    private List<Purchase> mPurchases;

    public ConsumeTask(IabHelper iabHelper,
                       @Nullable OnConsumeFinishedListener singleListener,
                       @Nullable OnConsumeMultiFinishedListener multiListener) {
        mIabHelper = iabHelper;
        mSingleListener = singleListener;
        mMultiListener = multiListener;
    }

    @Override
    protected void onPreExecute() {
        mIabHelper.flagStartAsync("consume");
    }

    @Override
    protected List<IabResult> doInBackground(final Purchase... purchases) {
        if (purchases == null || purchases.length == 0) throw new IllegalArgumentException("no purchases");

        mPurchases = new ArrayList<Purchase>(purchases.length);
        Collections.addAll(mPurchases, purchases);

        final List<IabResult> results = new ArrayList<IabResult>(purchases.length);
        for (Purchase purchase : purchases) {
            try {
                mIabHelper.consume(purchase);
                results.add(new IabResult(OK, "Successful consume of sku " + purchase.getSku()));
            } catch (IabException ex) {
                results.add(ex.getResult());
            }
        }
        return results;
    }

    @Override
    protected void onPostExecute(List<IabResult> results) {
        mIabHelper.flagEndAsync();
        if (mIabHelper.isDisposed() || isCancelled()) return;

        if (mSingleListener != null) {
            mSingleListener.onConsumeFinished(mPurchases.get(0), results.get(0));
        }

        if (mMultiListener != null) {
            mMultiListener.onConsumeMultiFinished(mPurchases, results);
        }
    }
}

Initialize array