2 * Copyright (C) 2008 ZXing authors
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 package com.google.zxing.client.android;
19 import com.google.zxing.BarcodeFormat;
20 import com.google.zxing.BinaryBitmap;
21 import com.google.zxing.DecodeHintType;
22 import com.google.zxing.MultiFormatReader;
23 import com.google.zxing.ReaderException;
24 import com.google.zxing.Result;
25 import com.google.zxing.ResultPointCallback;
26 import com.google.zxing.common.HybridBinarizer;
28 import android.content.SharedPreferences;
29 import android.os.Bundle;
30 import android.os.Handler;
31 import android.os.Looper;
32 import android.os.Message;
33 import android.preference.PreferenceManager;
34 import android.util.Log;
36 import java.util.Hashtable;
37 import java.util.Vector;
40 * This thread does all the heavy lifting of decoding the images.
42 * @author dswitkin@google.com (Daniel Switkin)
44 final class DecodeThread extends Thread {
46 public static final String BARCODE_BITMAP = "barcode_bitmap";
47 private static final String TAG = "DecodeThread";
49 private Handler handler;
50 private final CaptureActivity activity;
51 private final MultiFormatReader multiFormatReader;
52 private final ResultPointCallback resultPointCallback;
54 DecodeThread(CaptureActivity activity, String mode, ResultPointCallback resultPointCallback) {
55 this.activity = activity;
56 multiFormatReader = new MultiFormatReader();
57 this.resultPointCallback = resultPointCallback;
59 // The prefs can't change while the thread is running, so pick them up once here.
60 if (mode == null || mode.length() == 0) {
61 SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(activity);
62 boolean decode1D = prefs.getBoolean(PreferencesActivity.KEY_DECODE_1D, true);
63 boolean decodeQR = prefs.getBoolean(PreferencesActivity.KEY_DECODE_QR, true);
64 if (decode1D && decodeQR) {
66 } else if (decode1D) {
68 } else if (decodeQR) {
72 if (mode.equals(Intents.Scan.PRODUCT_MODE)) {
73 setDecodeProductMode();
74 } else if (mode.equals(Intents.Scan.ONE_D_MODE)) {
76 } else if (mode.equals(Intents.Scan.QR_CODE_MODE)) {
84 Handler getHandler() {
91 handler = new Handler() {
93 public void handleMessage(Message message) {
94 switch (message.what) {
96 decode((byte[]) message.obj, message.arg1, message.arg2);
99 Looper.myLooper().quit();
107 private void setDecodeProductMode() {
108 doSetDecodeMode(BarcodeFormat.UPC_A,
110 BarcodeFormat.EAN_13,
112 BarcodeFormat.RSS14);
116 * Select the 1D formats we want this client to decode by hand.
118 private void setDecode1DMode() {
119 doSetDecodeMode(BarcodeFormat.UPC_A,
121 BarcodeFormat.EAN_13,
123 BarcodeFormat.CODE_39,
124 BarcodeFormat.CODE_128,
126 BarcodeFormat.RSS14);
129 private void setDecodeQRMode() {
130 doSetDecodeMode(BarcodeFormat.QR_CODE);
134 * Instead of calling setHints(null), which would allow new formats to sneak in, we
135 * explicitly set which formats are available.
137 private void setDecodeAllMode() {
138 doSetDecodeMode(BarcodeFormat.UPC_A,
140 BarcodeFormat.EAN_13,
142 BarcodeFormat.CODE_39,
143 BarcodeFormat.CODE_128,
146 BarcodeFormat.QR_CODE);
149 private void doSetDecodeMode(BarcodeFormat... formats) {
150 Hashtable<DecodeHintType, Object> hints = new Hashtable<DecodeHintType, Object>(3);
151 Vector<BarcodeFormat> vector = new Vector<BarcodeFormat>(formats.length);
152 for (BarcodeFormat format : formats) {
153 vector.addElement(format);
155 hints.put(DecodeHintType.POSSIBLE_FORMATS, vector);
156 hints.put(DecodeHintType.NEED_RESULT_POINT_CALLBACK, resultPointCallback);
157 multiFormatReader.setHints(hints);
161 * Decode the data within the viewfinder rectangle, and time how long it took. For efficiency,
162 * reuse the same reader objects from one decode to the next.
164 * @param data The YUV preview frame.
165 * @param width The width of the preview frame.
166 * @param height The height of the preview frame.
168 private void decode(byte[] data, int width, int height) {
169 long start = System.currentTimeMillis();
170 Result rawResult = null;
171 PlanarYUVLuminanceSource source = CameraManager.get().buildLuminanceSource(data, width, height);
172 BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
174 rawResult = multiFormatReader.decodeWithState(bitmap);
175 } catch (ReaderException re) {
178 multiFormatReader.reset();
181 if (rawResult != null) {
182 long end = System.currentTimeMillis();
183 Log.v(TAG, "Found barcode (" + (end - start) + " ms):\n" + rawResult.toString());
184 Message message = Message.obtain(activity.getHandler(), R.id.decode_succeeded, rawResult);
185 Bundle bundle = new Bundle();
186 bundle.putParcelable(BARCODE_BITMAP, source.renderCroppedGreyscaleBitmap());
187 message.setData(bundle);
188 message.sendToTarget();
190 Message message = Message.obtain(activity.getHandler(), R.id.decode_failed);
191 message.sendToTarget();