android 调用摄像头

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.PixelFormat;
import android.hardware.Camera;
import android.hardware.Camera.PictureCallback;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.Window;

public class a1 extends Activity
{
private Preview mPreview;


/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);

// Create our Preview view and set it as the content of our activity.
mPreview = new Preview(this);
setContentView(mPreview);
}


public boolean onKeyUp(int keyCode, KeyEvent event)
{
switch (keyCode)
{
case KeyEvent.KEYCODE_DPAD_CENTER:
mPreview.takePicture();
break;
}
return true;
}
}

/* Preview-显示Preview */
class Preview extends SurfaceView implements SurfaceHolder.Callback 
{
  SurfaceHolder mHolder;
  Camera mCamera;
  Bitmap CameraBitmap;
   
  Preview(Context context) 
  {
  super(context);
  mHolder = getHolder();
  mHolder.addCallback(this);
  mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
  }

  public void surfaceCreated(SurfaceHolder holder) 
  {
  /* 启动Camera */
  mCamera = Camera.open();
  try 
  {
  mCamera.setPreviewDisplay(holder);
  } 
  catch (IOException exception) 
  {
  /* 释放mCamera */
  mCamera.release();
  mCamera = null;
  // TODO: add more exception handling logic here
  }
  }

  public void surfaceDestroyed(SurfaceHolder holder) 
  {
  /* 停止预览 */
  mCamera.stopPreview();
  mCamera = null;
  }  
  public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) 
  {
  /* 构建Camera.Parameters对相机的参数进行设置 */
  Camera.Parameters parameters = mCamera.getParameters();
  /* 设置拍照的图片格式 */
  parameters.setPictureFormat(PixelFormat.JPEG);
  /* 设置Preview的尺寸 */
  parameters.setPreviewSize(320, 480);
  /* 设置图像分辨率 */
  //parameters.setPictureSize(320, 480);
  /* 设置相机采用parameters */
  mCamera.setParameters(parameters);
  /* 开始预览 */
  mCamera.startPreview();
  }
  /* 拍照片 */
  public void takePicture() 
  {
  if (mCamera != null) 
  {
  mCamera.takePicture(null, null, jpegCallback);
  }
  }
  /* 拍照后输出图片 */
  private PictureCallback jpegCallback = new PictureCallback() 
  {
  public void onPictureTaken(byte[] _data, Camera _camera)
  {
  // TODO Handle JPEG image data
  CameraBitmap = BitmapFactory.decodeByteArray(_data, 0, _data.length); 
  File myCaptureFile = new File("/sdcard/camera1.jpg");
  try
  {
  BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(myCaptureFile));
  CameraBitmap.compress(Bitmap.CompressFormat.JPEG, 80, bos);
  bos.flush();
  bos.close();
  /* 将拍到的图片绘制出来 */
  Canvas canvas= mHolder.lockCanvas();
  canvas.drawBitmap(CameraBitmap, 0, 0, null);
  mHolder.unlockCanvasAndPost(canvas);
   
  }
  catch (Exception e)
  {
  e.getMessage();
  }
  }
  };
}
转http://www.ablanxue.com/prone_8920_1.html