IntentIntegrator.java

/*
 * Copyright 2009 ZXing authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.zxing.integration.android;

import android.annotation.TargetApi;
import android.app.Activity;
import android.app.Fragment;
import android.content.Intent;
import android.os.Build;
import android.os.Bundle;

import com.google.zxing.client.android.Intents;
import com.journeyapps.barcodescanner.CaptureActivity;

import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 *
 * @author Sean Owen
 * @author Fred Lin
 * @author Isaac Potoczny-Jones
 * @author Brad Drehmer
 * @author gcstang
 */
@SuppressWarnings("unused")
public class IntentIntegrator {

    public static int REQUEST_CODE = 0x0000c0de; // Only use bottom 16 bits
    private static final String TAG = IntentIntegrator.class.getSimpleName();

    // supported barcode formats
    public static final Collection<String> PRODUCT_CODE_TYPES = list("UPC_A", "UPC_E", "EAN_8", "EAN_13", "RSS_14");
    public static final Collection<String> ONE_D_CODE_TYPES =
            list("UPC_A", "UPC_E", "EAN_8", "EAN_13", "CODE_39", "CODE_93", "CODE_128",
                    "ITF", "RSS_14", "RSS_EXPANDED");
    public static final Collection<String> QR_CODE_TYPES = Collections.singleton("QR_CODE");
    public static final Collection<String> DATA_MATRIX_TYPES = Collections.singleton("DATA_MATRIX");

    public static final Collection<String> ALL_CODE_TYPES = null;

    private final Activity activity;
    private android.app.Fragment fragment;
    private android.support.v4.app.Fragment supportFragment;

    private final Map<String, Object> moreExtras = new HashMap<>(3);

    private Collection<String> desiredBarcodeFormats;

    private Class<?> captureActivity;

    protected Class<?> getDefaultCaptureActivity() {
        return CaptureActivity.class;
    }
    /**
     * @param activity {@link Activity} invoking the integration
     */
    public IntentIntegrator(Activity activity) {
        this.activity = activity;
    }

    public Class<?> getCaptureActivity() {
        if (captureActivity == null) {
            captureActivity = getDefaultCaptureActivity();
        }
        return captureActivity;
    }

    /**
     * Set the Activity class to use. It can be any activity, but should handle the intent extras
     * as used here.
     *
     * @param captureActivity the class
     */
    public IntentIntegrator setCaptureActivity(Class<?> captureActivity) {
        this.captureActivity = captureActivity;
        return this;
    }

    /**
     * @param fragment {@link Fragment} invoking the integration.
     *                 {@link #startActivityForResult(Intent, int)} will be called on the {@link Fragment} instead
     *                 of an {@link Activity}
     */
    public static IntentIntegrator forSupportFragment(android.support.v4.app.Fragment fragment) {
        IntentIntegrator integrator = new IntentIntegrator(fragment.getActivity());
        integrator.supportFragment = fragment;
        return integrator;
    }

    /**
     * @param fragment {@link Fragment} invoking the integration.
     *                 {@link #startActivityForResult(Intent, int)} will be called on the {@link Fragment} instead
     *                 of an {@link Activity}
     */
    @TargetApi(Build.VERSION_CODES.HONEYCOMB)
    public static IntentIntegrator forFragment(Fragment fragment) {
        IntentIntegrator integrator = new IntentIntegrator(fragment.getActivity());
        integrator.fragment = fragment;
        return integrator;
    }

    public Map<String, ?> getMoreExtras() {
        return moreExtras;
    }

    public final IntentIntegrator addExtra(String key, Object value) {
        moreExtras.put(key, value);
        return this;
    }

    /**
     * Set a prompt to display on the capture screen, instead of using the default.
     *
     * @param prompt the prompt to display
     */
    public final IntentIntegrator setPrompt(String prompt) {
        if (prompt != null) {
            addExtra(Intents.Scan.PROMPT_MESSAGE, prompt);
        }
        return this;
    }

    /**
     * By default, the orientation is locked. Set to false to not lock.
     *
     * @param locked true to lock orientation
     */
    public IntentIntegrator setOrientationLocked(boolean locked) {
        addExtra(Intents.Scan.ORIENTATION_LOCKED, locked);
        return this;
    }

    /**
     * Use the specified camera ID.
     *
     * @param cameraId camera ID of the camera to use. A negative value means "no preference".
     * @return this
     */
    public IntentIntegrator setCameraId(int cameraId) {
        if (cameraId >= 0) {
            addExtra(Intents.Scan.CAMERA_ID, cameraId);
        }
        return this;
    }

    /**
     * Set to false to disable beep on scan.
     *
     * @param enabled false to disable beep
     * @return this
     */
    public IntentIntegrator setBeepEnabled(boolean enabled) {
        addExtra(Intents.Scan.BEEP_ENABLED, enabled);
        return this;
    }

    /**
     * Set to true to enable saving the barcode image and sending its path in the result Intent.
     *
     * @param enabled true to enable barcode image
     * @return this
     */
    public IntentIntegrator setBarcodeImageEnabled(boolean enabled) {
        addExtra(Intents.Scan.BARCODE_IMAGE_ENABLED, enabled);
        return this;
    }

    /**
     * Set the desired barcode formats to scan.
     *
     * @param desiredBarcodeFormats names of {@code BarcodeFormat}s to scan for
     * @return this
     */
    public IntentIntegrator setDesiredBarcodeFormats(Collection<String> desiredBarcodeFormats) {
        this.desiredBarcodeFormats = desiredBarcodeFormats;
        return this;
    }

    /**
     * Initiates a scan for all known barcode types with the default camera.
     */
    public final void initiateScan() {
        startActivityForResult(createScanIntent(), REQUEST_CODE);
    }

    /**
     * Initiates a scan for all known barcode types with the default camera.
     * And starts a timer to finish on timeout
     * @return Activity.RESULT_CANCELED and true on parameter TIMEOUT.
     */
    public IntentIntegrator setTimeout(long timeout) {
        addExtra(Intents.Scan.TIMEOUT, timeout);
        return this;
    }

    /**
     * Create an scan intent with the specified options.
     *
     * @return the intent
     */
    public Intent createScanIntent() {
        Intent intentScan = new Intent(activity, getCaptureActivity());
        intentScan.setAction(Intents.Scan.ACTION);

        // check which types of codes to scan for
        if (desiredBarcodeFormats != null) {
            // set the desired barcode types
            StringBuilder joinedByComma = new StringBuilder();
            for (String format : desiredBarcodeFormats) {
                if (joinedByComma.length() > 0) {
                    joinedByComma.append(',');
                }
                joinedByComma.append(format);
            }
            intentScan.putExtra(Intents.Scan.FORMATS, joinedByComma.toString());
        }

        intentScan.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        intentScan.addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET);
        attachMoreExtras(intentScan);
        return intentScan;
    }

    /**
     * Initiates a scan, only for a certain set of barcode types, given as strings corresponding
     * to their names in ZXing's {@code BarcodeFormat} class like "UPC_A". You can supply constants
     * like {@link #PRODUCT_CODE_TYPES} for example.
     *
     * @param desiredBarcodeFormats names of {@code BarcodeFormat}s to scan for
     */
    public final void initiateScan(Collection<String> desiredBarcodeFormats) {
        setDesiredBarcodeFormats(desiredBarcodeFormats);
        initiateScan();
    }

    /**
     * Start an activity. This method is defined to allow different methods of activity starting for
     * newer versions of Android and for compatibility library.
     *
     * @param intent Intent to start.
     * @param code   Request code for the activity
     * @see android.app.Activity#startActivityForResult(Intent, int)
     * @see android.app.Fragment#startActivityForResult(Intent, int)
     */
    protected void startActivityForResult(Intent intent, int code) {
        if (fragment != null) {
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
                fragment.startActivityForResult(intent, code);
            }
        } else if (supportFragment != null) {
            supportFragment.startActivityForResult(intent, code);
        } else {
            activity.startActivityForResult(intent, code);
        }
    }

    protected void startActivity(Intent intent) {
        if (fragment != null) {
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
                fragment.startActivity(intent);
            }
        } else if (supportFragment != null) {
            supportFragment.startActivity(intent);
        } else {
            activity.startActivity(intent);
        }
    }

    /**
     * <p>Call this from your {@link Activity}'s
     * {@link Activity#onActivityResult(int, int, Intent)} method.</p>
     *
     * @param requestCode request code from {@code onActivityResult()}
     * @param resultCode  result code from {@code onActivityResult()}
     * @param intent      {@link Intent} from {@code onActivityResult()}
     * @return null if the event handled here was not related to this class, or
     * else an {@link IntentResult} containing the result of the scan. If the user cancelled scanning,
     * the fields will be null.
     */
    public static IntentResult parseActivityResult(int requestCode, int resultCode, Intent intent) {
        if (requestCode == REQUEST_CODE) {
            if (resultCode == Activity.RESULT_OK) {
                String contents = intent.getStringExtra(Intents.Scan.RESULT);
                String formatName = intent.getStringExtra(Intents.Scan.RESULT_FORMAT);
                byte[] rawBytes = intent.getByteArrayExtra(Intents.Scan.RESULT_BYTES);
                int intentOrientation = intent.getIntExtra(Intents.Scan.RESULT_ORIENTATION, Integer.MIN_VALUE);
                Integer orientation = intentOrientation == Integer.MIN_VALUE ? null : intentOrientation;
                String errorCorrectionLevel = intent.getStringExtra(Intents.Scan.RESULT_ERROR_CORRECTION_LEVEL);
                String barcodeImagePath = intent.getStringExtra(Intents.Scan.RESULT_BARCODE_IMAGE_PATH);
                return new IntentResult(contents,
                        formatName,
                        rawBytes,
                        orientation,
                        errorCorrectionLevel,
                        barcodeImagePath);
            }
            return new IntentResult();
        }
        return null;
    }

    private static List<String> list(String... values) {
        return Collections.unmodifiableList(Arrays.asList(values));
    }

    private void attachMoreExtras(Intent intent) {
        for (Map.Entry<String, Object> entry : moreExtras.entrySet()) {
            String key = entry.getKey();
            Object value = entry.getValue();
            // Kind of hacky
            if (value instanceof Integer) {
                intent.putExtra(key, (Integer) value);
            } else if (value instanceof Long) {
                intent.putExtra(key, (Long) value);
            } else if (value instanceof Boolean) {
                intent.putExtra(key, (Boolean) value);
            } else if (value instanceof Double) {
                intent.putExtra(key, (Double) value);
            } else if (value instanceof Float) {
                intent.putExtra(key, (Float) value);
            } else if (value instanceof Bundle) {
                intent.putExtra(key, (Bundle) value);
            } else {
                intent.putExtra(key, value.toString());
            }
        }
    }
}