org.transdroid.core.gui.search.BarcodeHelper.java Source code

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Here is the source code for org.transdroid.core.gui.search.BarcodeHelper.java

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/* 
 * Copyright 2010-2013 Eric Kok et al.
 * 
 * Transdroid is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * Transdroid is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with Transdroid.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.transdroid.core.gui.search;

import org.transdroid.core.R;
import org.transdroid.core.app.search.GoogleWebSearchBarcodeResolver;

import android.annotation.SuppressLint;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.content.Intent;
import android.net.Uri;
import android.support.v4.app.DialogFragment;
import android.text.TextUtils;

import com.actionbarsherlock.app.SherlockFragmentActivity;

public class BarcodeHelper {

    public static final int ACTIVITY_BARCODE = 0x0000c0de; // A 'random' ID to identify scan intents
    public static final Uri SCANNER_MARKET_URI = Uri
            .parse("market://search?q=pname:com.google.zxing.client.android");

    /**
     * Call this to start a bar code scanner intent. The calling activity will receive an Intent result with ID
     * {@link #ACTIVITY_BARCODE}. From there {@link #handleScanResult(int, Intent)} should be called to parse the result
     * into a search query.
     * @param activity The calling activity, to which the result is returned or a dialog is bound that asks to install
     *            the bar code scanner
     */
    @SuppressLint("ValidFragment")
    public static void startBarcodeScanner(final SherlockFragmentActivity activity) {
        try {
            // Start a bar code scanner that can handle the SCAN intent (specifically ZXing)
            activity.startActivityForResult(new Intent("com.google.zxing.client.android.SCAN"), ACTIVITY_BARCODE);
        } catch (Exception e) {
            // Can't start the bar code scanner, for example with a SecurityException or when ZXing is not present
            new DialogFragment() {
                public android.app.Dialog onCreateDialog(android.os.Bundle savedInstanceState) {
                    return new AlertDialog.Builder(activity).setIcon(android.R.drawable.ic_dialog_alert)
                            .setMessage(activity.getString(R.string.search_barcodescannernotfound))
                            .setPositiveButton(android.R.string.yes, new OnClickListener() {
                                @Override
                                public void onClick(DialogInterface dialog, int which) {
                                    if (activity != null)
                                        activity.startActivity(new Intent(Intent.ACTION_VIEW, SCANNER_MARKET_URI));
                                }
                            }).setNegativeButton(android.R.string.no, null).create();
                };
            }.show(activity.getSupportFragmentManager(), "installscanner");
        }
    }

    /**
     * The activity that called {@link #startBarcodeScanner(SherlockFragmentActivity)} should call this after the scan
     * result was returned. This will parse the scan data and return a query search query appropriate to the bar code.
     * @param resultCode The raw result code as returned by the bar code scanner
     * @param data The raw data as returned from the bar code scanner
     * @return A String that can be used as new search query, or null if the bar code could not be scanned or no query
     *         can be constructed for it
     */
    public static String handleScanResult(int resultCode, Intent data) {
        String contents = data.getStringExtra("SCAN_RESULT");
        String formatName = data.getStringExtra("SCAN_RESULT_FORMAT");
        if (formatName != null && formatName.equals("QR_CODE")) {
            // Scanned barcode was a QR code: return the contents directly
            return contents;
        } else {
            if (TextUtils.isEmpty(contents))
                return null;
            // Get a meaningful search query based on a Google Search product lookup
            return GoogleWebSearchBarcodeResolver.resolveBarcode(contents);
        }
    }

}