Android Open Source - zxingfragmentlib Bar Code Scanner Fragment

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License

The source code is released under:
Apache License
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Java Source Code

package com.welcu.android.zxingfragmentlib;
/*from   w  w w  .jav a2s.  c o m*/
import android.annotation.TargetApi;
import android.content.SharedPreferences;
import android.content.pm.ActivityInfo;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
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.Fragment;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.KeyEvent;
import android.view.LayoutInflater;
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 com.google.zxing.BarcodeFormat;
import com.google.zxing.DecodeHintType;
import com.google.zxing.Result;
import com.google.zxing.ResultPoint;
import com.google.zxing.client.android.AmbientLightManager;
import com.google.zxing.client.android.BeepManager;
import com.google.zxing.client.android.InactivityTimer;
import com.google.zxing.client.android.ScanFromWebPageManager;
import com.google.zxing.client.android.ViewfinderView;
import com.google.zxing.client.android.camera.CameraManager;

import java.io.IOException;
import java.util.Collection;
import java.util.Map;

/*
 * 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.
 */


/**
 * 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 class BarCodeScannerFragment extends Fragment implements SurfaceHolder.Callback {

  private static final String TAG = BarCodeScannerFragment.class.getSimpleName();

  private static final long DEFAULT_INTENT_RESULT_DURATION_MS = 1500L;
  private CameraManager cameraManager;
  private Result savedResultToShow;
  private ViewfinderView viewfinderView;
  private BarCodeScannerHandler handler;
//  private TextView statusView;
//  private View resultView;
  private Result lastResult;
  private boolean hasSurface;
  private boolean copyToClipboard;
  private ScanFromWebPageManager scanFromWebPageManager;
  private Collection<BarcodeFormat> decodeFormats;
  private Map<DecodeHintType,?> decodeHints;
  private String characterSet;
  private InactivityTimer inactivityTimer;
  private BeepManager beepManager;
  private AmbientLightManager ambientLightManager;
  private IResultCallback mCallBack;

  public interface IResultCallback {
    void result(Result lastResult);
  }

  ViewfinderView getViewfinderView() {
    return viewfinderView;
  }

  public Handler getHandler() {
    return handler;
  }

  CameraManager getCameraManager() {
    return cameraManager;
  }

  @Override
  public void onCreate(Bundle icicle) {
    super.onCreate(icicle);

    hasSurface = false;
    inactivityTimer = new InactivityTimer(getActivity());
    beepManager = new BeepManager(getActivity());
    ambientLightManager = new AmbientLightManager(getActivity());

    PreferenceManager.setDefaultValues(getActivity(), R.xml.preferences, false);
  }

  @Override
  public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstance) {
    View view = inflater.inflate(R.layout.capture, container, false);

    Window window = getActivity().getWindow();
    window.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);

    return view;
  }

  @Override
  public void onResume() {
    super.onResume();

    startScan();
  }

  @Override
  public void onPause() {
    stopScan();

    super.onPause();
  }

  public void startScan() {
    if (cameraManager != null) {
      Log.e(TAG, "startScan: scan already started.");
      return;
    }

    cameraManager = new CameraManager(getActivity());

    viewfinderView = (ViewfinderView) getView().findViewById(R.id.viewfinder_view);
    viewfinderView.setCameraManager(cameraManager);

    handler = null;
    lastResult = null;

    SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getActivity());
//
//    if (prefs.getBoolean(PreferencesActivity.KEY_DISABLE_AUTO_ORIENTATION, true)) {
//      //noinspection ResourceType
//      getActivity().setRequestedOrientation(getCurrentOrientation());
//    } else {
//      getActivity().setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_SENSOR_LANDSCAPE);
//    }

    SurfaceView surfaceView = (SurfaceView) getView().findViewById(R.id.preview_view);
    SurfaceHolder surfaceHolder = surfaceView.getHolder();
    surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
    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();

    decodeFormats = null;
    characterSet = null;
  }

  public void stopScan() {
    if (cameraManager == null) {
      Log.e(TAG, "stopScan: scan already stopped");
      return;
    }

    if (handler != null) {
      handler.quitSynchronously();
      handler = null;
    }

    inactivityTimer.onPause();
    ambientLightManager.stop();
    beepManager.close();
    cameraManager.closeDriver();
    cameraManager = null;

    if (!hasSurface) {
      SurfaceView surfaceView = (SurfaceView) getView().findViewById(R.id.preview_view);
      SurfaceHolder surfaceHolder = surfaceView.getHolder();
      surfaceHolder.removeCallback(this);
    }
  }

  public void setTorch(boolean state) {
    if (cameraManager!=null) {
      cameraManager.setTorch(state);
    }
  }

  public void setTorchOn() {
    setTorch(true);
  }

  public void setTorchOff() {
    setTorch(false);
  }

  public void setmCallBack(IResultCallback mCallBack) {
    this.mCallBack = mCallBack;
  }

  @TargetApi(Build.VERSION_CODES.FROYO)
  private int getCurrentOrientation() {
    int rotation = getActivity().getWindowManager().getDefaultDisplay().getRotation();
    switch (rotation) {
      case Surface.ROTATION_0:
      case Surface.ROTATION_90:
        return ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE;
      default:
        return ActivityInfo.SCREEN_ORIENTATION_REVERSE_LANDSCAPE;
    }
  }


  @Override
  public void onDestroy() {
    inactivityTimer.shutdown();
    super.onDestroy();
  }

  public boolean onKeyDown(int keyCode, KeyEvent event) {
    switch (keyCode) {
      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:
        setTorchOff();
        return true;
      case KeyEvent.KEYCODE_VOLUME_UP:
        setTorchOn();
        return true;
    }
    return false;
  }

  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, IConstants.DECODE_SUCCEDED, 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(getActivity(), rawResult);

    boolean fromLiveScan = barcode != null;
    if (fromLiveScan) {
      beepManager.playBeepSoundAndVibrate();
      drawResultPoints(barcode, scaleFactor, rawResult);
      if (mCallBack!=null) {
        mCallBack.result(rawResult);
      }

      restartPreviewAfterDelay(500L);
    }
  }

  /**
   * 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);
    }
  }

  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 BarCodeScannerHandler(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(IConstants.RESTART_PREVIEW, delayMS);
    }
  }

  public void drawViewfinder() {
    viewfinderView.drawViewfinder();
  }
}
Java Source Code List
