android 调用摄像头

阅读更多 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();
}
}
};
}
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