Android Open Source - edgefinder Edge Finder

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License

The source code is released under:

Apache License

Java Source Code

/*
 * Copyright (C) 2010 William Robert Beene
 *//  w ww  .  j  av  a2  s . co  m
 * 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.
 */
package bwr.edgefinder;

import java.io.IOException;

import android.app.Activity;
import android.hardware.Camera;
import android.media.AudioManager;
import android.media.SoundPool;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.WindowManager;
import android.widget.FrameLayout;

public class EdgeFinder extends Activity implements SurfaceHolder.Callback {

  private Camera camera;
  private EdgeView edgeView;
  private SurfaceView cameraView;
  private FrameLayout frameLayout;
  
  private SoundPool soundPool;
  private int shutterSound = 0;
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    // Get the entire screen
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);

    edgeView = new EdgeView(this);

    // Create the surface for the camera to draw its preview on
    cameraView = new SurfaceView(this);
    cameraView.getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
    cameraView.getHolder().addCallback(this);

    // Setup the layout where the cameraView is completely obscured by the edgeView
    frameLayout = new FrameLayout(this);
    frameLayout.addView(cameraView);
    frameLayout.addView(edgeView);
    setContentView(frameLayout);
    
    // Prevent camera preview from showing up first
    edgeView.postInvalidate();
    
    soundPool = new SoundPool(1, AudioManager.STREAM_NOTIFICATION, 0);
    shutterSound = soundPool.load(this, R.raw.camera_click, 0);
  }
  
  @Override
  protected void onDestroy() {
    super.onDestroy();
    soundPool.release();
    soundPool = null;
  }

  @Override
  protected void onPause() {
    super.onPause();
    stopCameraPreview();
  }

  private void stopCameraPreview() {
    if (camera != null) {
      camera.setPreviewCallback(null);
      camera.stopPreview();
      camera.release();
      camera = null;
    }
  }
  
  private void startCameraPreview() {
    camera = Camera.open();
    try {
      camera.setPreviewDisplay(cameraView.getHolder());
    } catch (IOException e) {
      e.printStackTrace();
    }
    camera.setPreviewCallback(edgeView);
  }

  public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
    Camera.Parameters parameters = camera.getParameters();
    parameters.setPreviewSize(width, height); // TODO: check that width, height are a valid camera preview size
    camera.setParameters(parameters);
    camera.startPreview();
  }

  public void surfaceCreated(SurfaceHolder holder) {
    startCameraPreview();
  }

  public void surfaceDestroyed(SurfaceHolder holder) {
    stopCameraPreview();
  }

  @Override
  public boolean onKeyDown(int keyCode, KeyEvent event) {
    if (keyCode==KeyEvent.KEYCODE_CAMERA || keyCode==KeyEvent.KEYCODE_SEARCH) {
      edgeView.captureNextFrame();

      if(soundPool != null)
        soundPool.play(shutterSound, 1f, 1f, 0, 0, 1);
      
      return true;
    }
    return false;
  }

}

Java Source Code List

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