Android Open Source - BarcodeTest Capture Activity

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License

The source code is released under:

Copyright (c) 2014, zhongwcool All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: * R...

Java Source Code

package com.zxing.activity;
/* w ww  .j a  v  a  2 s  . c om*/
import java.io.IOException;
import java.util.Vector;

import android.app.Activity;
import android.content.Intent;
import android.content.res.AssetFileDescriptor;
import android.graphics.Bitmap;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnCompletionListener;
import android.os.Bundle;
import android.os.Handler;
import android.os.Vibrator;
import android.view.SurfaceHolder;
import android.view.SurfaceHolder.Callback;
import android.view.SurfaceView;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

import com.ericssonlabs.R;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.Result;
import com.zxing.camera.CameraManager;
import com.zxing.decoding.CaptureActivityHandler;
import com.zxing.decoding.InactivityTimer;
import com.zxing.view.ViewfinderView;
/**
 * Initial the camera
 * @author Ryan.Tang
 */
public class CaptureActivity extends Activity implements Callback {

  private CaptureActivityHandler handler;
  private ViewfinderView viewfinderView;
  private boolean hasSurface;
  private Vector<BarcodeFormat> decodeFormats;
  private String characterSet;
  private InactivityTimer inactivityTimer;
  private MediaPlayer mediaPlayer;
  private boolean playBeep;
  private static final float BEEP_VOLUME = 0.10f;
  private boolean vibrate;
  private Button cancelScanButton;

  /** Called when the activity is first created. */
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.layout_scan);
    //ViewUtil.addTopView(getApplicationContext(), this, R.string.scan_card);
    CameraManager.init(getApplication());
    viewfinderView = (ViewfinderView) findViewById(R.id.viewfinder_view);
    cancelScanButton = (Button) this.findViewById(R.id.btn_cancel_scan);
    hasSurface = false;
    inactivityTimer = new InactivityTimer(this);
  }

  @Override
  protected void onResume() {
    super.onResume();
    SurfaceView surfaceView = (SurfaceView) findViewById(R.id.preview_view);
    SurfaceHolder surfaceHolder = surfaceView.getHolder();
    if (hasSurface) {
      initCamera(surfaceHolder);
    } else {
      surfaceHolder.addCallback(this);
      surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
    }
    decodeFormats = null;
    characterSet = null;

    playBeep = true;
    AudioManager audioService = (AudioManager) getSystemService(AUDIO_SERVICE);
    if (audioService.getRingerMode() != AudioManager.RINGER_MODE_NORMAL) {
      playBeep = false;
    }
    initBeepSound();
    vibrate = true;
    
    //quit the scan view
    cancelScanButton.setOnClickListener(new OnClickListener() {
      
      @Override
      public void onClick(View v) {
        CaptureActivity.this.finish();
      }
    });
  }

  @Override
  protected void onPause() {
    super.onPause();
    if (handler != null) {
      handler.quitSynchronously();
      handler = null;
    }
    CameraManager.get().closeDriver();
  }

  @Override
  protected void onDestroy() {
    inactivityTimer.shutdown();
    super.onDestroy();
  }
  
  /**
   * Handler scan result
   * @param result
   * @param barcode
   */
  public void handleDecode(Result result, Bitmap barcode) {
    inactivityTimer.onActivity();
    playBeepSoundAndVibrate();
    String resultString = result.getText();
    //FIXME
    if (resultString.equals("")) {
      Toast.makeText(CaptureActivity.this, "Scan failed!", Toast.LENGTH_SHORT).show();
    }else {
//      System.out.println("Result:"+resultString);
      Intent resultIntent = new Intent();
      Bundle bundle = new Bundle();
      bundle.putString("result", resultString);
      resultIntent.putExtras(bundle);
      this.setResult(RESULT_OK, resultIntent);
    }
    CaptureActivity.this.finish();
  }
  
  private void initCamera(SurfaceHolder surfaceHolder) {
    try {
      CameraManager.get().openDriver(surfaceHolder);
    } catch (IOException ioe) {
      return;
    } catch (RuntimeException e) {
      return;
    }
    if (handler == null) {
      handler = new CaptureActivityHandler(this, decodeFormats,
          characterSet);
    }
  }

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

  }

  @Override
  public void surfaceCreated(SurfaceHolder holder) {
    if (!hasSurface) {
      hasSurface = true;
      initCamera(holder);
    }

  }

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

  }

  public ViewfinderView getViewfinderView() {
    return viewfinderView;
  }

  public Handler getHandler() {
    return handler;
  }

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

  }

  private void initBeepSound() {
    if (playBeep && mediaPlayer == null) {
      // The volume on STREAM_SYSTEM is not adjustable, and users found it
      // too loud,
      // so we now play on the music stream.
      setVolumeControlStream(AudioManager.STREAM_MUSIC);
      mediaPlayer = new MediaPlayer();
      mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
      mediaPlayer.setOnCompletionListener(beepListener);

      AssetFileDescriptor file = getResources().openRawResourceFd(
          R.raw.beep);
      try {
        mediaPlayer.setDataSource(file.getFileDescriptor(),
            file.getStartOffset(), file.getLength());
        file.close();
        mediaPlayer.setVolume(BEEP_VOLUME, BEEP_VOLUME);
        mediaPlayer.prepare();
      } catch (IOException e) {
        mediaPlayer = null;
      }
    }
  }

  private static final long VIBRATE_DURATION = 200L;

  private void playBeepSoundAndVibrate() {
    if (playBeep && mediaPlayer != null) {
      mediaPlayer.start();
    }
    if (vibrate) {
      Vibrator vibrator = (Vibrator) getSystemService(VIBRATOR_SERVICE);
      vibrator.vibrate(VIBRATE_DURATION);
    }
  }

  /**
   * When the beep has finished playing, rewind to queue up another one.
   */
  private final OnCompletionListener beepListener = new OnCompletionListener() {
    public void onCompletion(MediaPlayer mediaPlayer) {
      mediaPlayer.seekTo(0);
    }
  };

}

Java Source Code List

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