Android Open Source - final_app Capture Activity

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Java Source Code

/*
 * Copyright (C) 2008 ZXing authors/* ww w. j  a v a  2s . com*/
 *
 * 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.client.android;

import java.io.IOException;
import java.text.DateFormat;
import java.util.Collection;
import java.util.Date;
import java.util.EnumSet;
import java.util.Map;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.Intent;
import android.content.SharedPreferences;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.net.Uri;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.preference.PreferenceManager;
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.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 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.google.zxing.client.android.camera.CameraManager;
import com.google.zxing.client.android.clipboard.ClipboardInterface;
import com.google.zxing.client.android.history.HistoryActivity;
import com.google.zxing.client.android.history.HistoryItem;
import com.google.zxing.client.android.history.HistoryManager;
import com.google.zxing.client.android.result.ResultButtonListener;
import com.google.zxing.client.android.result.ResultHandler;
import com.google.zxing.client.android.result.ResultHandlerFactory;
import com.google.zxing.client.android.result.supplement.SupplementalInfoRetriever;
import com.google.zxing.client.android.share.ShareActivity;

/**
 * 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 long DEFAULT_INTENT_RESULT_DURATION_MS = 1500L;
  private static final long BULK_MODE_SCAN_DELAY_MS = 1000L;

  private static final String[] ZXING_URLS = { "http://zxing.appspot.com/scan", "zxing://scan/" };

  public static final int HISTORY_REQUEST_CODE = 0x0000bacc;

  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;
    historyManager = new HistoryManager(this);
    historyManager.trimHistory();
    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();

    // 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;

    resetStatusView();

    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);
    }

    beepManager.updatePrefs();
    ambientLightManager.start(cameraManager);

    inactivityTimer.onResume();

    Intent intent = getIntent();

    SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
    copyToClipboard = prefs.getBoolean(PreferencesActivity.KEY_COPY_TO_CLIPBOARD, true)
        && (intent == null || intent.getBooleanExtra(Intents.Scan.SAVE_HISTORY, true));

    source = IntentSource.NONE;
    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);
          }
        }

        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);

    }
  }

  private static boolean isZXingURL(String dataString) {
    if (dataString == null) {
      return false;
    }
    for (String url : 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();
    cameraManager.closeDriver();
    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.addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET);
    int itemId = item.getItemId();
    if (itemId == R.id.menu_share) {
      intent.setClassName(this, ShareActivity.class.getName());
      startActivity(intent);
    } else if (itemId == R.id.menu_history) {
      intent.setClassName(this, HistoryActivity.class.getName());
      startActivityForResult(intent, HISTORY_REQUEST_CODE);
    } else if (itemId == R.id.menu_settings) {
      intent.setClassName(this, PreferencesActivity.class.getName());
      startActivity(intent);
    } else if (itemId == R.id.menu_help) {
      intent.setClassName(this, HelpActivity.class.getName());
      startActivity(intent);
    } else {
      return super.onOptionsItemSelected(item);
    }
    return true;
  }

  @Override
  public void onActivityResult(int requestCode, int resultCode, Intent intent) {
    if (resultCode == RESULT_OK) {
      if (requestCode == HISTORY_REQUEST_CODE) {
        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();
        // Wait a moment or else it will scan the same barcode continuously about 3 times
        restartPreviewAfterDelay(BULK_MODE_SCAN_DELAY_MS);
      } else {
        handleDecodeInternally(rawResult, resultHandler, barcode);
      }
      break;
    }
  }

  /**
   * 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) {
    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(new Date(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);
      }
    }

    TextView contentsTextView = (TextView) findViewById(R.id.contents_text_view);
    CharSequence displayContents = resultHandler.getDisplayContents();
    contentsTextView.setText(displayContents);
    // Crudely scale betweeen 22 and 32 -- bigger font for shorter text
    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);
      }
    }

    if (copyToClipboard && !resultHandler.areContentsSecure()) {
      ClipboardInterface.setText(displayContents, this);
    }
  }

  // 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 = DEFAULT_INTENT_RESULT_DURATION_MS;
    } else {
      resultDurationMS = getIntent().getLongExtra(Intents.Scan.RESULT_DISPLAY_DURATION_MS, 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);
    }

    if (copyToClipboard && !resultHandler.areContentsSecure()) {
      CharSequence text = resultHandler.getDisplayContents();
      ClipboardInterface.setText(text, this);
    }

    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);
        sendReplyMessage(R.id.launch_product_query, replyURL, resultDurationMS);
      }

    }
  }

  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();
  }
}
Java Source Code List
