Android Open Source - EnergyWastingApp Still Camera

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License

The source code is released under:

Copyright ? 2013-2014 Pekka Ekman <pekka.ekman@aalto.fi> 2013 Babujee Jerome Robin <robin.babujeejerome@aalto.fi> Permission is hereby granted, free of charge, to any person obtaining a ...

Java Source Code

package fi.aalto.pekman.energywastingapp.components;
/*  w w w  . j a  v a2s  .  c o m*/
import java.io.IOException;

import fi.aalto.pekman.energywastingapp.R;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.DialogInterface;
import android.hardware.Camera;
import android.hardware.Camera.Parameters;
import android.os.Bundle;
import android.support.v4.app.DialogFragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.SurfaceHolder;
import android.view.View;
import android.widget.RadioGroup;

public class StillCamera extends AbstractCamera {

  @Override
  public String getName() { return "Camera (still photos) & flash"; }

  private static String flashMode = Parameters.FLASH_MODE_TORCH;

  private volatile boolean takingPicture = false;
  private Thread thread;

  /** UI component that shows the preview image from camera */
  private class Preview extends AbstractCamera.Preview {
    
    protected void onStart(SurfaceHolder holder) {
      try {
        cam.setPreviewDisplay(holder);
      } catch (IOException e) {
        Log.e("StillCamera.Preview.onStart()",
            "Error setting camera preview: " + e.getMessage(), e);
        onError();
        return;
      }
      
      // start taking pictures
      thread.start();
    }
    
    protected void onError() {
      stop();
      markTurnedOff();
    }
  }

  @Override
  public void start() {
    if (cam == null && isSupported())
      cam = getCamera();
    
    if (cam != null) {
      Parameters p = cam.getParameters();
      p.setFlashMode(flashMode);
      cam.setParameters(p);
      
      // create thread that takes pictures, but don't start it yet
      thread = new Thread() {
        @Override
        public synchronized void run() {
          takePicture();
          
          while (cam != null) {
            while (takingPicture) {
              try {
                wait();
              } catch (InterruptedException e) {
                e.printStackTrace();
              }
            }
            if (cam == null)
              return;
            
            cam.startPreview();
            takePicture();
          }
        };
      };
      
      // create and add preview UI component
      addPreview(new Preview());
    }
    else
      markTurnedOff();
  }
  
  private void takePicture() {
    if (cam != null) {
      takingPicture = true;
      
      Log.d("StillCamera.takePicture()", "Taking picture");
      cam.takePicture(null, null, null, new Camera.PictureCallback() {
        @Override
        public void onPictureTaken(byte[] data, Camera camera) {
          Log.d("StillCamera.takePicture()", "Picture taken");
          
          // wake up picture taking thread so that it can take a new picture
          synchronized (thread) {
            takingPicture = false;
            thread.notify();
          }
        }
      });
    }
  }

  @Override
  public void stop() {
    super.stop();
    
    if (thread != null) {
      // wake up picture taking thread so that it can stop properly
      synchronized (thread) {
        thread.notify();
      }
    }
  }

  @Override
  public DialogFragment getSettingsDialog() {
    return new SettingsDialog();
  }

  public static class SettingsDialog extends DialogFragment {

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
      AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
      LayoutInflater inflater = getActivity().getLayoutInflater();
      View view = inflater.inflate(R.layout.dialog_stillcamera_settings, null);
      
      int id;
      if (flashMode == Parameters.FLASH_MODE_TORCH)
        id = R.id.flashModeTorch;
      else if (flashMode == Parameters.FLASH_MODE_ON)
        id = R.id.flashModeOn;
      else if (flashMode == Parameters.FLASH_MODE_OFF)
        id = R.id.flashModeOff;
      else if (flashMode == Parameters.FLASH_MODE_RED_EYE)
        id = R.id.flashModeRedEye;
      else
        id = -1;
      ((RadioGroup) view.findViewById(R.id.flashModeRadioGroup)).check(id);
      
      builder.setTitle("Camera & flash settings")
        .setView(view)
        .setPositiveButton("Ok", new DialogInterface.OnClickListener() {
          public void onClick(DialogInterface dialog, int id) {
            RadioGroup wf = (RadioGroup)
                ((Dialog) dialog).findViewById(R.id.flashModeRadioGroup);
            switch (wf.getCheckedRadioButtonId()) {
              case R.id.flashModeTorch:
                flashMode = Parameters.FLASH_MODE_TORCH; break;
              case R.id.flashModeOff:
                flashMode = Parameters.FLASH_MODE_OFF; break;
              case R.id.flashModeRedEye:
                flashMode = Parameters.FLASH_MODE_RED_EYE; break;
              case R.id.flashModeOn:
              default:
                flashMode = Parameters.FLASH_MODE_ON; break;
            }
            Log.d("StillCamera.SettingsDialog", "Setting flash mode to " + flashMode);
          }
        })
        .setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
          public void onClick(DialogInterface dialog, int id) {
            SettingsDialog.this.getDialog().cancel();
          }
        });
      
      return builder.create();
    }
  }
}

Java Source Code List

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