Android Open Source - ivotingverification Q R Scanner Activity

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License

The source code is released under:

GNU General Public License

Java Source Code

/**
 * Copyright (C) 2013 Eesti Vabariigi Valimiskomisjon 
 * (Estonian National Electoral Committee), www.vvk.ee
 */*from   w  w w  .java 2  s . c  o m*/
 * Written in 2013 by AS Finestmedia, www.finestmedia.ee
 * 
 * Vote-verification application for Estonian Internet voting system
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 **/
 
package ee.vvk.ivotingverification;

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

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Rect;
import android.os.Bundle;
import android.os.Handler;
import android.os.Vibrator;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.Window;
import android.view.WindowManager;
import android.widget.TextView;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.Result;
import com.google.zxing.ResultPoint;

import ee.vvk.ivotingverification.qr.CameraManager;
import ee.vvk.ivotingverification.qr.CaptureActivityHandler;
import ee.vvk.ivotingverification.qr.DecodeFormatManager;
import ee.vvk.ivotingverification.qr.InactivityTimer;
import ee.vvk.ivotingverification.qr.Intents;
import ee.vvk.ivotingverification.qr.ViewfinderView;
import ee.vvk.ivotingverification.util.Util;

/**
 * QR code decoder activity.
 * 
 * @version 13.05.2013
 */
public class QRScannerActivity extends Activity implements
    SurfaceHolder.Callback {

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

  private CameraManager cameraManager;
  private CaptureActivityHandler handler;
  private ViewfinderView viewfinderView;
  private TextView statusView;
  private boolean hasSurface;
  private Collection<BarcodeFormat> decodeFormats;
  private String characterSet;
  private InactivityTimer inactivityTimer;

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

    requestWindowFeature(Window.FEATURE_NO_TITLE);
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
        WindowManager.LayoutParams.FLAG_FULLSCREEN);

    setContentView(R.layout.qrscanner_activity);

    hasSurface = false;
    if (this != null)
      inactivityTimer = new InactivityTimer(this);
  }

  public ViewfinderView getViewfinderView() {
    return viewfinderView;
  }

  public Handler getHandler() {
    return handler;
  }

  public CameraManager getCameraManager() {
    return cameraManager;
  }

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

    if (this == null)
      return;

    cameraManager = new CameraManager(this);

    if (cameraManager == null) {
      Intent i = this.getIntent();
      this.finish();
      startActivity(i);
      return;
    }

    viewfinderView = (ViewfinderView) this
        .findViewById(R.id.viewfinder_view);

    if (viewfinderView == null) {
      Intent i = this.getIntent();
      this.finish();
      startActivity(i);
      return;
    }

    viewfinderView.setCameraManager(cameraManager);

    handler = null;

    SurfaceView surfaceView = (SurfaceView) this
        .findViewById(R.id.preview_view);
    SurfaceHolder surfaceHolder = surfaceView.getHolder();
    if (hasSurface) {
      initCamera(surfaceHolder, false);
    } else {
      surfaceHolder.addCallback(this);
      surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
    }

    inactivityTimer.onResume();

    Intent intent = this.getIntent();

    decodeFormats = null;
    characterSet = null;

    if (intent != null) {
      String action = intent.getAction();

      if (Intents.Scan.ACTION.equals(action)) {
        decodeFormats = DecodeFormatManager.parseDecodeFormats(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);
        }
      }
      characterSet = intent.getStringExtra(Intents.Scan.CHARACTER_SET);
    }
  }

  @Override
  public void onPause() {
    if (handler != null) {
      handler.quitSynchronously();
      handler = null;
    }
    inactivityTimer.onPause();
    cameraManager.closeDriver();
    if (!hasSurface) {
      SurfaceView surfaceView = (SurfaceView) this
          .findViewById(R.id.preview_view);
      if (surfaceView != null) {
        SurfaceHolder surfaceHolder = surfaceView.getHolder();
        surfaceHolder.removeCallback(this);
      }
    }
    super.onPause();
  }

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

  @Override
  public void surfaceCreated(SurfaceHolder holder) {
    if (holder == null) {
      if (Util.DEBUGGABLE) {
        Log.e(TAG,
            "*** WARNING *** surfaceCreated() gave us a null surface!");
      }
    }
    if (!hasSurface) {
      hasSurface = true;
      initCamera(holder, false);
    }
  }

  @Override
  public void surfaceDestroyed(SurfaceHolder holder) {
    hasSurface = false;
  }

  @Override
  public void surfaceChanged(SurfaceHolder holder, int format, int width,
      int height) {

  }

  public void handleDecode(Result rawResult, Bitmap barcode) {
    inactivityTimer.onActivity();

    if (this == null)
      return;

    if (rawResult != null && barcode != null) {
      Vibrator vibrator = (Vibrator) this
          .getSystemService(Context.VIBRATOR_SERVICE);
      vibrator.vibrate(Util.VIBRATE_DURATION);
      drawResultPoints(barcode, rawResult);

      Intent returnIntent = new Intent();
      returnIntent.putExtra(Util.RESULT, rawResult.getText());
      setResult(RESULT_OK, returnIntent);
      finish();
    } else {
      Intent returnIntent = new Intent();
      setResult(RESULT_CANCELED, returnIntent);
      finish();
    }
  }

  private void drawResultPoints(Bitmap barcode, 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_image_border));
      paint.setStrokeWidth(3.0f);
      paint.setStyle(Paint.Style.STROKE);
      Rect border = new Rect(2, 2, barcode.getWidth() - 2,
          barcode.getHeight() - 2);
      canvas.drawRect(border, paint);

      paint.setColor(getResources().getColor(R.color.result_points));
      if (points.length == 2) {
        paint.setStrokeWidth(4.0f);
        drawLine(canvas, paint, points[0], points[1]);
      } else if (points.length == 4
          && (rawResult.getBarcodeFormat() == BarcodeFormat.UPC_A || rawResult
              .getBarcodeFormat() == BarcodeFormat.EAN_13)) {
        drawLine(canvas, paint, points[0], points[1]);
        drawLine(canvas, paint, points[2], points[3]);
      } else {
        paint.setStrokeWidth(10.0f);
        for (ResultPoint point : points) {
          canvas.drawPoint(point.getX(), point.getY(), paint);
        }
      }
    }
  }

  private static void drawLine(Canvas canvas, Paint paint, ResultPoint a,
      ResultPoint b) {
    canvas.drawLine(a.getX(), a.getY(), b.getX(), b.getY(), paint);
  }

  private void initCamera(SurfaceHolder surfaceHolder, boolean flashlight) {
    try {
      cameraManager.openDriver(surfaceHolder, flashlight);
      if (handler == null) {
        handler = new CaptureActivityHandler(this, decodeFormats,
            characterSet, cameraManager);
      }
    } catch (IOException ioe) {
      if (Util.DEBUGGABLE) {
        Log.e(TAG, "Error:" + ioe);
      }
    } catch (RuntimeException e) {
      if (Util.DEBUGGABLE) {
        Log.w(TAG, "Unexpected error initializing camera", e);
      }
    }
  }

  public void restartPreviewAfterDelay(long delayMS) {
    if (handler != null) {
      handler.sendEmptyMessageDelayed(R.id.restart_preview, delayMS);
    }
  }

  public void drawViewfinder() {
    viewfinderView.drawViewfinder();
  }
}

Java Source Code List

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