Java tutorial
/* * Copyright (C) 2008 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. */ /* Prominent notice: This file has been modified from the original zxing code for the KochZap app. */ package com.coact.kochzap; import com.google.zxing.BarcodeFormat; import com.google.zxing.DecodeHintType; import com.google.zxing.Result; import com.google.zxing.ResultMetadataType; import com.google.zxing.ResultPoint; import com.coact.kochzap.camera.CameraManager; import com.coact.kochzap.clipboard.ClipboardInterface; import com.coact.kochzap.history.HistoryActivity; import com.coact.kochzap.history.HistoryItem; import com.coact.kochzap.history.HistoryManager; import com.coact.kochzap.result.ResultButtonListener; import com.coact.kochzap.result.ResultHandler; import com.coact.kochzap.result.ResultHandlerFactory; import com.coact.kochzap.result.supplement.SupplementalInfoRetriever; import com.coact.kochzap.util.Companies; import android.Manifest; import android.app.Activity; import android.app.AlertDialog; import android.content.Intent; import android.content.SharedPreferences; import android.content.pm.ActivityInfo; import android.content.pm.PackageManager; import android.content.res.Configuration; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Canvas; import android.graphics.Paint; import android.net.Uri; import android.os.Build; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.preference.PreferenceManager; import android.support.v4.app.ActivityCompat; import android.support.v4.content.ContextCompat; import android.util.Log; import android.util.TypedValue; import android.view.KeyEvent; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.view.Surface; import android.view.SurfaceHolder; import android.view.SurfaceView; import android.view.View; import android.view.ViewGroup; import android.view.Window; import android.view.WindowManager; import android.widget.ImageView; import android.widget.TextView; import android.widget.Toast; import java.io.IOException; import java.text.DateFormat; import java.util.Collection; import java.util.EnumSet; import java.util.Map; /** * This activity opens the camera and does the actual scanning on a background thread. It draws a * viewfinder to help the user place the barcode correctly, shows feedback as the image processing * is happening, and then overlays the results when a scan is successful. * * @author dswitkin@google.com (Daniel Switkin) * @author Sean Owen */ public final class CaptureActivity extends Activity implements SurfaceHolder.Callback { private static final String TAG = CaptureActivity.class.getSimpleName(); private static final Collection<ResultMetadataType> DISPLAYABLE_METADATA_TYPES = EnumSet.of( ResultMetadataType.ISSUE_NUMBER, ResultMetadataType.SUGGESTED_PRICE, ResultMetadataType.ERROR_CORRECTION_LEVEL, ResultMetadataType.POSSIBLE_COUNTRY); private CameraManager cameraManager; private CaptureActivityHandler handler; private Result savedResultToShow; private ViewfinderView viewfinderView; private TextView statusView; private View resultView; private Result lastResult; private boolean hasSurface; private boolean copyToClipboard; private IntentSource source; private String sourceUrl; private ScanFromWebPageManager scanFromWebPageManager; private Collection<BarcodeFormat> decodeFormats; private Map<DecodeHintType, ?> decodeHints; private String characterSet; private HistoryManager historyManager; private InactivityTimer inactivityTimer; private BeepManager beepManager; private AmbientLightManager ambientLightManager; ViewfinderView getViewfinderView() { return viewfinderView; } public Handler getHandler() { return handler; } CameraManager getCameraManager() { return cameraManager; } @Override public void onCreate(Bundle icicle) { super.onCreate(icicle); Window window = getWindow(); window.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON); setContentView(R.layout.capture); hasSurface = false; inactivityTimer = new InactivityTimer(this); beepManager = new BeepManager(this); ambientLightManager = new AmbientLightManager(this); PreferenceManager.setDefaultValues(this, R.xml.preferences, false); } @Override protected void onResume() { super.onResume(); // historyManager must be initialized here to update the history preference historyManager = new HistoryManager(this); historyManager.trimHistory(); // CameraManager must be initialized here, not in onCreate(). This is necessary because we don't // want to open the camera driver and measure the screen size if we're going to show the help on // first launch. That led to bugs where the scanning rectangle was the wrong size and partially // off screen. cameraManager = new CameraManager(getApplication()); viewfinderView = (ViewfinderView) findViewById(R.id.viewfinder_view); viewfinderView.setCameraManager(cameraManager); resultView = findViewById(R.id.result_view); statusView = (TextView) findViewById(R.id.status_view); handler = null; lastResult = null; SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this); setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_SENSOR_LANDSCAPE); resetStatusView(); beepManager.updatePrefs(); ambientLightManager.start(cameraManager); inactivityTimer.onResume(); Intent intent = getIntent(); copyToClipboard = prefs.getBoolean(PreferencesActivity.KEY_COPY_TO_CLIPBOARD, true) && (intent == null || intent.getBooleanExtra(Intents.Scan.SAVE_HISTORY, true)); source = IntentSource.NONE; sourceUrl = null; scanFromWebPageManager = null; decodeFormats = null; characterSet = null; if (intent != null) { String action = intent.getAction(); String dataString = intent.getDataString(); if (Intents.Scan.ACTION.equals(action)) { // Scan the formats the intent requested, and return the result to the calling activity. source = IntentSource.NATIVE_APP_INTENT; decodeFormats = DecodeFormatManager.parseDecodeFormats(intent); decodeHints = DecodeHintManager.parseDecodeHints(intent); if (intent.hasExtra(Intents.Scan.WIDTH) && intent.hasExtra(Intents.Scan.HEIGHT)) { int width = intent.getIntExtra(Intents.Scan.WIDTH, 0); int height = intent.getIntExtra(Intents.Scan.HEIGHT, 0); if (width > 0 && height > 0) { cameraManager.setManualFramingRect(width, height); } } if (intent.hasExtra(Intents.Scan.CAMERA_ID)) { int cameraId = intent.getIntExtra(Intents.Scan.CAMERA_ID, -1); if (cameraId >= 0) { cameraManager.setManualCameraId(cameraId); } } String customPromptMessage = intent.getStringExtra(Intents.Scan.PROMPT_MESSAGE); if (customPromptMessage != null) { statusView.setText(customPromptMessage); } } else if (dataString != null && dataString.contains("http://www.google") && dataString.contains("/m/products/scan")) { // Scan only products and send the result to mobile Product Search. source = IntentSource.PRODUCT_SEARCH_LINK; sourceUrl = dataString; decodeFormats = DecodeFormatManager.PRODUCT_FORMATS; } else if (isZXingURL(dataString)) { // Scan formats requested in query string (all formats if none specified). // If a return URL is specified, send the results there. Otherwise, handle it ourselves. source = IntentSource.ZXING_LINK; sourceUrl = dataString; Uri inputUri = Uri.parse(dataString); scanFromWebPageManager = new ScanFromWebPageManager(inputUri); decodeFormats = DecodeFormatManager.parseDecodeFormats(inputUri); // Allow a sub-set of the hints to be specified by the caller. decodeHints = DecodeHintManager.parseDecodeHints(inputUri); } characterSet = intent.getStringExtra(Intents.Scan.CHARACTER_SET); } SurfaceView surfaceView = (SurfaceView) findViewById(R.id.preview_view); SurfaceHolder surfaceHolder = surfaceView.getHolder(); if (hasSurface) { // The activity was paused but not stopped, so the surface still exists. Therefore // surfaceCreated() won't be called, so init the camera here. initCamera(surfaceHolder); } else { // Install the callback and wait for surfaceCreated() to init the camera. surfaceHolder.addCallback(this); } } private int getCurrentOrientation() { int rotation = getWindowManager().getDefaultDisplay().getRotation(); if (getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE) { switch (rotation) { case Surface.ROTATION_0: case Surface.ROTATION_90: return ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE; default: return ActivityInfo.SCREEN_ORIENTATION_REVERSE_LANDSCAPE; } } else { switch (rotation) { case Surface.ROTATION_0: case Surface.ROTATION_270: return ActivityInfo.SCREEN_ORIENTATION_PORTRAIT; default: return ActivityInfo.SCREEN_ORIENTATION_REVERSE_PORTRAIT; } } } private static boolean isZXingURL(String dataString) { if (dataString == null) { return false; } for (String url : Constants.ZXING_URLS) { if (dataString.startsWith(url)) { return true; } } return false; } @Override protected void onPause() { if (handler != null) { handler.quitSynchronously(); handler = null; } inactivityTimer.onPause(); ambientLightManager.stop(); beepManager.close(); cameraManager.closeDriver(); //historyManager = null; // Keep for onActivityResult if (!hasSurface) { SurfaceView surfaceView = (SurfaceView) findViewById(R.id.preview_view); SurfaceHolder surfaceHolder = surfaceView.getHolder(); surfaceHolder.removeCallback(this); } super.onPause(); } @Override protected void onDestroy() { inactivityTimer.shutdown(); super.onDestroy(); } @Override public boolean onKeyDown(int keyCode, KeyEvent event) { switch (keyCode) { case KeyEvent.KEYCODE_BACK: if (source == IntentSource.NATIVE_APP_INTENT) { setResult(RESULT_CANCELED); finish(); return true; } if ((source == IntentSource.NONE || source == IntentSource.ZXING_LINK) && lastResult != null) { restartPreviewAfterDelay(0L); return true; } break; case KeyEvent.KEYCODE_FOCUS: case KeyEvent.KEYCODE_CAMERA: // Handle these events so they don't launch the Camera app return true; // Use volume up/down to turn on light case KeyEvent.KEYCODE_VOLUME_DOWN: cameraManager.setTorch(false); return true; case KeyEvent.KEYCODE_VOLUME_UP: cameraManager.setTorch(true); return true; } return super.onKeyDown(keyCode, event); } @Override public boolean onCreateOptionsMenu(Menu menu) { MenuInflater menuInflater = getMenuInflater(); menuInflater.inflate(R.menu.capture, menu); return super.onCreateOptionsMenu(menu); } @Override public boolean onOptionsItemSelected(MenuItem item) { Intent intent = new Intent(Intent.ACTION_VIEW); intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); switch (item.getItemId()) { case R.id.menu_start: intent.setClassName(this, StartActivity.class.getName()); startActivity(intent); finish(); return true; case R.id.menu_share: startActivity(intent); finish(); return true; case R.id.menu_history: intent.setClassName(this, HistoryActivity.class.getName()); startActivityForResult(intent, Constants.HISTORY_REQUEST_CODE); finish(); return true; case R.id.menu_settings: intent.setClassName(this, PreferencesActivity.class.getName()); startActivity(intent); finish(); return true; case R.id.menu_help: intent.setClassName(this, HelpActivity.class.getName()); startActivity(intent); finish(); return true; default: return super.onOptionsItemSelected(item); } } @Override public void onActivityResult(int requestCode, int resultCode, Intent intent) { if (resultCode == RESULT_OK && requestCode == Constants.HISTORY_REQUEST_CODE && historyManager != null) { int itemNumber = intent.getIntExtra(Intents.History.ITEM_NUMBER, -1); if (itemNumber >= 0) { HistoryItem historyItem = historyManager.buildHistoryItem(itemNumber); decodeOrStoreSavedBitmap(null, historyItem.getResult()); } } } private void decodeOrStoreSavedBitmap(Bitmap bitmap, Result result) { // Bitmap isn't used yet -- will be used soon if (handler == null) { savedResultToShow = result; } else { if (result != null) { savedResultToShow = result; } if (savedResultToShow != null) { Message message = Message.obtain(handler, R.id.decode_succeeded, savedResultToShow); handler.sendMessage(message); } savedResultToShow = null; } } @Override public void surfaceCreated(SurfaceHolder holder) { if (holder == null) { Log.e(TAG, "*** WARNING *** surfaceCreated() gave us a null surface!"); } if (!hasSurface) { hasSurface = true; initCamera(holder); } } @Override public void surfaceDestroyed(SurfaceHolder holder) { hasSurface = false; } @Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { } /** * A valid barcode has been found, so give an indication of success and show the results. * * @param rawResult The contents of the barcode. * @param scaleFactor amount by which thumbnail was scaled * @param barcode A greyscale bitmap of the camera data which was decoded. */ public void handleDecode(Result rawResult, Bitmap barcode, float scaleFactor) { inactivityTimer.onActivity(); lastResult = rawResult; ResultHandler resultHandler = ResultHandlerFactory.makeResultHandler(this, rawResult); boolean fromLiveScan = barcode != null; if (fromLiveScan) { historyManager.addHistoryItem(rawResult, resultHandler); // Then not from history, so beep/vibrate and we have an image to draw on beepManager.playBeepSoundAndVibrate(); drawResultPoints(barcode, scaleFactor, rawResult); } switch (source) { case NATIVE_APP_INTENT: case PRODUCT_SEARCH_LINK: handleDecodeExternally(rawResult, resultHandler, barcode); break; case ZXING_LINK: if (scanFromWebPageManager == null || !scanFromWebPageManager.isScanFromWebPage()) { handleDecodeInternally(rawResult, resultHandler, barcode); } else { handleDecodeExternally(rawResult, resultHandler, barcode); } break; case NONE: SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this); if (fromLiveScan && prefs.getBoolean(PreferencesActivity.KEY_BULK_MODE, false)) { Toast.makeText(getApplicationContext(), getResources().getString(R.string.msg_bulk_mode_scanned) + " (" + rawResult.getText() + ')', Toast.LENGTH_SHORT).show(); maybeSetClipboard(resultHandler); // Wait a moment or else it will scan the same barcode continuously about 3 times restartPreviewAfterDelay(Constants.BULK_MODE_SCAN_DELAY_MS); } else { handleDecodeInternally(rawResult, resultHandler, barcode); } break; } /* if (Companies.containsscan(rawResult.toString())) { Intent intent = new Intent(Intent.ACTION_VIEW); intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET); intent.setClassName(this, StopActivity.class.getName()); intent.putExtra("scan", rawResult.toString()); intent.putExtra("company", Companies.companyFromScan(rawResult.toString())); startActivity(intent); } */ } /** * Superimpose a line for 1D or dots for 2D to highlight the key features of the barcode. * * @param barcode A bitmap of the captured image. * @param scaleFactor amount by which thumbnail was scaled * @param rawResult The decoded results which contains the points to draw. */ private void drawResultPoints(Bitmap barcode, float scaleFactor, Result rawResult) { ResultPoint[] points = rawResult.getResultPoints(); if (points != null && points.length > 0) { Canvas canvas = new Canvas(barcode); Paint paint = new Paint(); paint.setColor(getResources().getColor(R.color.result_points)); if (points.length == 2) { paint.setStrokeWidth(4.0f); drawLine(canvas, paint, points[0], points[1], scaleFactor); } else if (points.length == 4 && (rawResult.getBarcodeFormat() == BarcodeFormat.UPC_A || rawResult.getBarcodeFormat() == BarcodeFormat.EAN_13)) { // Hacky special case -- draw two lines, for the barcode and metadata drawLine(canvas, paint, points[0], points[1], scaleFactor); drawLine(canvas, paint, points[2], points[3], scaleFactor); } else { paint.setStrokeWidth(10.0f); for (ResultPoint point : points) { if (point != null) { canvas.drawPoint(scaleFactor * point.getX(), scaleFactor * point.getY(), paint); } } } } } private static void drawLine(Canvas canvas, Paint paint, ResultPoint a, ResultPoint b, float scaleFactor) { if (a != null && b != null) { canvas.drawLine(scaleFactor * a.getX(), scaleFactor * a.getY(), scaleFactor * b.getX(), scaleFactor * b.getY(), paint); } } // Put up our own UI for how to handle the decoded contents. private void handleDecodeInternally(Result rawResult, ResultHandler resultHandler, Bitmap barcode) { maybeSetClipboard(resultHandler); SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this); if (resultHandler.getDefaultButtonID() != null && prefs.getBoolean(PreferencesActivity.KEY_AUTO_OPEN_WEB, false)) { resultHandler.handleButtonPress(resultHandler.getDefaultButtonID()); return; } statusView.setVisibility(View.GONE); viewfinderView.setVisibility(View.GONE); resultView.setVisibility(View.VISIBLE); ImageView barcodeImageView = (ImageView) findViewById(R.id.barcode_image_view); if (barcode == null) { barcodeImageView.setImageBitmap(BitmapFactory.decodeResource(getResources(), R.drawable.launcher_icon)); } else { barcodeImageView.setImageBitmap(barcode); } TextView formatTextView = (TextView) findViewById(R.id.format_text_view); formatTextView.setText(rawResult.getBarcodeFormat().toString()); TextView typeTextView = (TextView) findViewById(R.id.type_text_view); typeTextView.setText(resultHandler.getType().toString()); DateFormat formatter = DateFormat.getDateTimeInstance(DateFormat.SHORT, DateFormat.SHORT); TextView timeTextView = (TextView) findViewById(R.id.time_text_view); timeTextView.setText(formatter.format(rawResult.getTimestamp())); TextView metaTextView = (TextView) findViewById(R.id.meta_text_view); View metaTextViewLabel = findViewById(R.id.meta_text_view_label); metaTextView.setVisibility(View.GONE); metaTextViewLabel.setVisibility(View.GONE); Map<ResultMetadataType, Object> metadata = rawResult.getResultMetadata(); if (metadata != null) { StringBuilder metadataText = new StringBuilder(20); for (Map.Entry<ResultMetadataType, Object> entry : metadata.entrySet()) { if (DISPLAYABLE_METADATA_TYPES.contains(entry.getKey())) { metadataText.append(entry.getValue()).append('\n'); } } if (metadataText.length() > 0) { metadataText.setLength(metadataText.length() - 1); metaTextView.setText(metadataText); metaTextView.setVisibility(View.VISIBLE); metaTextViewLabel.setVisibility(View.VISIBLE); } } CharSequence displayContents = resultHandler.getDisplayContents(); TextView contentsTextView = (TextView) findViewById(R.id.contents_text_view); contentsTextView.setText(displayContents); int scaledSize = Math.max(22, 32 - displayContents.length() / 4); contentsTextView.setTextSize(TypedValue.COMPLEX_UNIT_SP, scaledSize); TextView supplementTextView = (TextView) findViewById(R.id.contents_supplement_text_view); supplementTextView.setText(""); supplementTextView.setOnClickListener(null); if (PreferenceManager.getDefaultSharedPreferences(this).getBoolean(PreferencesActivity.KEY_SUPPLEMENTAL, true)) { SupplementalInfoRetriever.maybeInvokeRetrieval(supplementTextView, resultHandler.getResult(), historyManager, this); } int buttonCount = resultHandler.getButtonCount(); ViewGroup buttonView = (ViewGroup) findViewById(R.id.result_button_view); buttonView.requestFocus(); for (int x = 0; x < ResultHandler.MAX_BUTTON_COUNT; x++) { TextView button = (TextView) buttonView.getChildAt(x); if (x < buttonCount) { button.setVisibility(View.VISIBLE); button.setText(resultHandler.getButtonText(x)); button.setOnClickListener(new ResultButtonListener(resultHandler, x)); } else { button.setVisibility(View.GONE); } } } // Briefly show the contents of the barcode, then handle the result outside Barcode Scanner. private void handleDecodeExternally(Result rawResult, ResultHandler resultHandler, Bitmap barcode) { if (barcode != null) { viewfinderView.drawResultBitmap(barcode); } long resultDurationMS; if (getIntent() == null) { resultDurationMS = Constants.DEFAULT_INTENT_RESULT_DURATION_MS; } else { resultDurationMS = getIntent().getLongExtra(Intents.Scan.RESULT_DISPLAY_DURATION_MS, Constants.DEFAULT_INTENT_RESULT_DURATION_MS); } if (resultDurationMS > 0) { String rawResultString = String.valueOf(rawResult); if (rawResultString.length() > 32) { rawResultString = rawResultString.substring(0, 32) + " ..."; } statusView.setText(getString(resultHandler.getDisplayTitle()) + " : " + rawResultString); } maybeSetClipboard(resultHandler); if (source == IntentSource.NATIVE_APP_INTENT) { // Hand back whatever action they requested - this can be changed to Intents.Scan.ACTION when // the deprecated intent is retired. Intent intent = new Intent(getIntent().getAction()); intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET); intent.putExtra(Intents.Scan.RESULT, rawResult.toString()); intent.putExtra(Intents.Scan.RESULT_FORMAT, rawResult.getBarcodeFormat().toString()); byte[] rawBytes = rawResult.getRawBytes(); if (rawBytes != null && rawBytes.length > 0) { intent.putExtra(Intents.Scan.RESULT_BYTES, rawBytes); } Map<ResultMetadataType, ?> metadata = rawResult.getResultMetadata(); if (metadata != null) { if (metadata.containsKey(ResultMetadataType.UPC_EAN_EXTENSION)) { intent.putExtra(Intents.Scan.RESULT_UPC_EAN_EXTENSION, metadata.get(ResultMetadataType.UPC_EAN_EXTENSION).toString()); } Number orientation = (Number) metadata.get(ResultMetadataType.ORIENTATION); if (orientation != null) { intent.putExtra(Intents.Scan.RESULT_ORIENTATION, orientation.intValue()); } String ecLevel = (String) metadata.get(ResultMetadataType.ERROR_CORRECTION_LEVEL); if (ecLevel != null) { intent.putExtra(Intents.Scan.RESULT_ERROR_CORRECTION_LEVEL, ecLevel); } @SuppressWarnings("unchecked") Iterable<byte[]> byteSegments = (Iterable<byte[]>) metadata.get(ResultMetadataType.BYTE_SEGMENTS); if (byteSegments != null) { int i = 0; for (byte[] byteSegment : byteSegments) { intent.putExtra(Intents.Scan.RESULT_BYTE_SEGMENTS_PREFIX + i, byteSegment); i++; } } } sendReplyMessage(R.id.return_scan_result, intent, resultDurationMS); } else if (source == IntentSource.PRODUCT_SEARCH_LINK) { // Reformulate the URL which triggered us into a query, so that the request goes to the same // TLD as the scan URL. int end = sourceUrl.lastIndexOf("/scan"); String replyURL = sourceUrl.substring(0, end) + "?q=" + resultHandler.getDisplayContents() + "&source=zxing"; sendReplyMessage(R.id.launch_product_query, replyURL, resultDurationMS); } else if (source == IntentSource.ZXING_LINK) { if (scanFromWebPageManager != null && scanFromWebPageManager.isScanFromWebPage()) { String replyURL = scanFromWebPageManager.buildReplyURL(rawResult, resultHandler); scanFromWebPageManager = null; sendReplyMessage(R.id.launch_product_query, replyURL, resultDurationMS); } } } private void maybeSetClipboard(ResultHandler resultHandler) { if (copyToClipboard && !resultHandler.areContentsSecure()) { ClipboardInterface.setText(resultHandler.getDisplayContents(), this); } } private void sendReplyMessage(int id, Object arg, long delayMS) { if (handler != null) { Message message = Message.obtain(handler, id, arg); if (delayMS > 0L) { handler.sendMessageDelayed(message, delayMS); } else { handler.sendMessage(message); } } } private void initCamera(SurfaceHolder surfaceHolder) { if (surfaceHolder == null) { throw new IllegalStateException("No SurfaceHolder provided"); } if (cameraManager.isOpen()) { Log.w(TAG, "initCamera() while already open -- late SurfaceView callback?"); return; } try { cameraManager.openDriver(surfaceHolder); // Creating the handler starts the preview, which can also throw a RuntimeException. if (handler == null) { handler = new CaptureActivityHandler(this, decodeFormats, decodeHints, characterSet, cameraManager); } decodeOrStoreSavedBitmap(null, null); } catch (IOException ioe) { Log.w(TAG, ioe); displayFrameworkBugMessageAndExit(); } catch (RuntimeException e) { // Barcode Scanner has seen crashes in the wild of this variety: // java.?lang.?RuntimeException: Fail to connect to camera service Log.w(TAG, "Unexpected error initializing camera", e); displayFrameworkBugMessageAndExit(); } } private void displayFrameworkBugMessageAndExit() { AlertDialog.Builder builder = new AlertDialog.Builder(this); builder.setTitle(getString(R.string.app_name)); builder.setMessage(getString(R.string.msg_camera_framework_bug)); builder.setPositiveButton(R.string.button_ok, new FinishListener(this)); builder.setOnCancelListener(new FinishListener(this)); builder.show(); } public void restartPreviewAfterDelay(long delayMS) { if (handler != null) { handler.sendEmptyMessageDelayed(R.id.restart_preview, delayMS); } resetStatusView(); } private void resetStatusView() { resultView.setVisibility(View.GONE); statusView.setText(R.string.msg_default_status); statusView.setVisibility(View.VISIBLE); viewfinderView.setVisibility(View.VISIBLE); lastResult = null; } public void drawViewfinder() { viewfinderView.drawViewfinder(); } }