Android Open Source - EnergyWastingApp Abstract 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 ...

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Java Source Code

package fi.aalto.pekman.energywastingapp.components;
//from  ww  w. ja v  a 2s  .c  o  m
import fi.aalto.pekman.energywastingapp.R;

import android.content.pm.PackageManager;
import android.hardware.Camera;
import android.hardware.Camera.Parameters;
import android.os.Build;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.ViewGroup;

public abstract class AbstractCamera extends Component {

  protected volatile Camera cam = null;
  protected Preview preview = null;

  @Override
  public boolean isSupported() {
    return context.getPackageManager()
        .hasSystemFeature(PackageManager.FEATURE_CAMERA);
  }

  /** UI component that shows the preview image from camera */
  protected abstract class Preview extends SurfaceView implements SurfaceHolder.Callback {
    
    public Preview() {
      super(context);
      
      SurfaceHolder h = getHolder();
      h.addCallback(this);
      
      // this deprecated method needs to be called on older API levels
      if(Build.VERSION.SDK_INT < 11)
        h.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
    }
    
    public void surfaceCreated(SurfaceHolder holder) {
      Log.d("Camera", "Surface created");
      
      try {
        cam.startPreview();
      } catch (Exception e) {
        Log.e("Camera", "Error starting camera preview: " + e.getMessage(), e);
        onError();
        return;
      }
      
      onStart(holder);
    }
    
    public void surfaceDestroyed(SurfaceHolder holder) {
      Log.d("Camera", "Surface destroyed");
    }
    
    public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
      Log.d("Camera", "Surface changed");
    }
    
    /** Called when the camera has been initialized. */
    protected void onStart(SurfaceHolder holder) {}
    
    /** Called when there was an error initializing the camera. */
    protected void onError() {}
  }

  protected Camera getCamera() {
    try {
      return Camera.open();
    } catch (Exception e) {
      Log.e("AbstractCamera.getCamera()", e.toString(), e);
      return null;
    }
  }

  protected void turnOnFlashlight() {
    Parameters p = cam.getParameters();
    p.setFlashMode(Parameters.FLASH_MODE_TORCH);
    cam.setParameters(p);
  }

  protected void addPreview(Preview preview) {
    this.preview = preview;
    ((ViewGroup) context.findViewById(R.id.MainFrameLayout)).addView(preview, 0);
  }

  @Override
  public void stop() {
    if (preview != null) {
      ((ViewGroup) context.findViewById(R.id.MainFrameLayout)).removeView(preview);
      preview = null;
    }
    if (cam != null) {
      cam.stopPreview();
      cam.release();
      cam = null;
    }
  }

  @Override
  public void onPause() {
    if (running)
      stop();
  }

  @Override
  public void onResume() {
    if (running)
      start();
  }

}

Java Source Code List