2 * Copyright 2007 Google Inc.
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.j2me;
19 import javax.microedition.io.ConnectionNotFoundException;
20 import javax.microedition.lcdui.Alert;
21 import javax.microedition.lcdui.AlertType;
22 import javax.microedition.lcdui.Canvas;
23 import javax.microedition.lcdui.Command;
24 import javax.microedition.lcdui.CommandListener;
25 import javax.microedition.lcdui.Display;
26 import javax.microedition.lcdui.Displayable;
27 import javax.microedition.media.Manager;
28 import javax.microedition.media.MediaException;
29 import javax.microedition.media.Player;
30 import javax.microedition.media.control.VideoControl;
31 import javax.microedition.midlet.MIDlet;
32 import javax.microedition.midlet.MIDletStateChangeException;
33 import javax.microedition.amms.control.camera.ZoomControl;
34 import java.io.IOException;
37 * <p>The actual reader application {@link MIDlet}.</p>
39 * @author Sean Owen (srowen@google.com)
41 public final class ZXingMIDlet extends MIDlet {
43 private static final int MAX_ZOOM = 200;
45 private Canvas canvas;
46 private Player player;
47 private VideoControl videoControl;
53 VideoControl getVideoControl() {
57 protected void startApp() throws MIDletStateChangeException {
59 player = Manager.createPlayer("capture://video");
62 videoControl = (VideoControl) player.getControl("VideoControl");
63 canvas = new VideoCanvas(this);
64 canvas.setFullScreenMode(true);
65 videoControl.initDisplayMode(VideoControl.USE_DIRECT_VIDEO, canvas);
66 videoControl.setDisplayLocation(0, 0);
67 videoControl.setDisplaySize(canvas.getWidth(), canvas.getHeight());
68 videoControl.setVisible(true);
70 Display.getDisplay(this).setCurrent(canvas);
71 } catch (IOException ioe) {
72 throw new MIDletStateChangeException(ioe.toString());
73 } catch (MediaException me) {
74 throw new MIDletStateChangeException(me.toString());
78 private static void setZoom(Player player) {
79 // zoom up to 2x if possible
80 ZoomControl zoomControl = (ZoomControl) player.getControl("javax.microedition.amms.control.camera.ZoomControl");
81 if (zoomControl != null) {
82 int maxZoom = zoomControl.getMaxOpticalZoom();
84 zoomControl.setOpticalZoom(maxZoom > MAX_ZOOM ? MAX_ZOOM : maxZoom);
86 int maxDigitalZoom = zoomControl.getMaxDigitalZoom();
87 if (maxDigitalZoom > 100) {
88 zoomControl.setDigitalZoom(maxDigitalZoom > MAX_ZOOM ? MAX_ZOOM : maxDigitalZoom);
94 protected void pauseApp() {
98 } catch (MediaException me) {
105 protected void destroyApp(boolean unconditional) {
106 if (player != null) {
110 } catch (MediaException me) {
124 // Convenience methods to show dialogs
126 void showYesNo(String title, final String text) {
127 Alert alert = new Alert(title, text, null, AlertType.CONFIRMATION);
128 alert.setTimeout(Alert.FOREVER);
129 final Command cancel = new Command("Cancel", Command.CANCEL, 1);
130 alert.addCommand(cancel);
131 CommandListener listener = new CommandListener() {
132 public void commandAction(Command command, Displayable displayable) {
133 if (command.getCommandType() == Command.OK) {
135 platformRequest(text);
136 } catch (ConnectionNotFoundException cnfe) {
143 Display.getDisplay(ZXingMIDlet.this).setCurrent(canvas);
147 alert.setCommandListener(listener);
151 void showAlert(String title, String text) {
152 Alert alert = new Alert(title, text, null, AlertType.INFO);
153 alert.setTimeout(Alert.FOREVER);
157 void showError(Throwable t) {
158 showAlert(new Alert("Error", t.getMessage(), null, AlertType.ERROR));
161 private void showAlert(Alert alert) {
162 Display display = Display.getDisplay(this);
163 display.setCurrent(alert, canvas);
166 void handleDecodedText(String text) {
167 // This is a crude imitation of the code found in module core-ext, which handles the contents
168 // in a more sophisticated way. It can't be accessed from JavaME just yet because it relies
169 // on URL parsing routines in java.net. This should be somehow worked around: TODO
170 // For now, detect URLs in a simple way, and treat everything else as text
171 if (text.startsWith("http://") || text.startsWith("https://") || maybeURLWithoutScheme(text)) {
172 showYesNo("Open web page?", text);
174 showAlert("Barcode detected", text);
178 private static boolean maybeURLWithoutScheme(String text) {
179 return text.indexOf((int) '.') >= 0 && text.indexOf((int) ' ') < 0;