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 android.app.Activity;
20 import android.content.Intent;
21 import android.graphics.Bitmap;
22 import android.net.Uri;
23 import android.os.Bundle;
24 import android.os.Handler;
25 import android.os.Message;
26 import com.google.zxing.Result;
29 * This class handles all the messaging which comprises the state machine for capture.
31 public final class CaptureActivityHandler extends Handler {
33 private final CaptureActivity mActivity;
34 private final DecodeThread mDecodeThread;
43 CaptureActivityHandler(CaptureActivity activity, String decodeMode,
44 boolean beginScanning) {
46 mDecodeThread = new DecodeThread(activity, decodeMode);
47 mDecodeThread.start();
48 mState = State.SUCCESS;
50 // Start ourselves capturing previews and decoding.
51 CameraManager.get().startPreview();
53 restartPreviewAndDecode();
58 public void handleMessage(Message message) {
59 switch (message.what) {
61 // When one auto focus pass finishes, start another. This is the closest thing to
62 // continuous AF. It does seem to hunt a bit, but I'm not sure what else to do.
63 if (mState == State.PREVIEW) {
64 CameraManager.get().requestAutoFocus(this, R.id.auto_focus);
67 case R.id.restart_preview:
68 restartPreviewAndDecode();
70 case R.id.decode_succeeded:
71 mState = State.SUCCESS;
72 Bundle bundle = message.getData();
73 Bitmap barcode = bundle.getParcelable(DecodeThread.BARCODE_BITMAP);
74 mActivity.handleDecode((Result) message.obj, barcode);
76 case R.id.decode_failed:
77 // We're decoding as fast as possible, so when one decode fails, start another.
78 mState = State.PREVIEW;
79 CameraManager.get().requestPreviewFrame(mDecodeThread.mHandler, R.id.decode);
81 case R.id.return_scan_result:
82 mActivity.setResult(Activity.RESULT_OK, (Intent) message.obj);
85 case R.id.launch_product_query:
86 String url = (String) message.obj;
87 mActivity.startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse(url)));
92 public void quitSynchronously() {
94 CameraManager.get().stopPreview();
95 Message quit = Message.obtain(mDecodeThread.mHandler, R.id.quit);
99 } catch (InterruptedException e) {
102 // Be absolutely sure we don't send any queued up messages
103 removeMessages(R.id.decode_succeeded);
104 removeMessages(R.id.decode_failed);
107 private void restartPreviewAndDecode() {
108 if (mState == State.SUCCESS) {
109 mState = State.PREVIEW;
110 CameraManager.get().requestPreviewFrame(mDecodeThread.mHandler, R.id.decode);
111 CameraManager.get().requestAutoFocus(this, R.id.auto_focus);
112 mActivity.drawViewfinder();