【2013.07.15】自定义SurfaceView、自定义相机

1.自定义SurfaceView

SurfaceView是一个跟TextView、ImageView同等的控件，我们可以自定义TextView等，当然也可以自定义SurfaceView。在引用的时候，只需写出自定义SurfaceView的全类名即可。

新建CameraView类，继承自SurfaceView

 

public class CameraView extends SurfaceView implements
		android.view.SurfaceHolder.Callback {

	Camera camera;
	SurfaceHolder holder;
	Parameters para;

	/**
	 * @描述 官方文档说raw是未经压缩的图像数据，尝试着去写，但是未能成功
	 * 小提示 (NOTE: the data will be null if there
	 *     is no raw image callback buffer available or the raw image callback
	 *     buffer is not large enough to hold the raw image)
	 * */
	PictureCallback rawCallback = new PictureCallback() {

		@Override
		public void onPictureTaken(byte[] data, Camera camera) {
			camera.stopPreview();
			savePhoto(data);
			camera.startPreview();

		}
			//这样的写入照片是错误的，无法载入图片
		private void savePhoto(byte[] data) {

			String dirPath = Environment.getExternalStorageDirectory()
					.getAbsolutePath() + "/AAcamera/";
			File dirFile = new File(dirPath);
			if (!dirFile.exists()) {
				dirFile.mkdirs();
			}
			String fileName = String.valueOf(System.currentTimeMillis())
					+ ".jpeg";
			System.out.println(dirPath);
			File file = new File(dirPath + fileName);
			FileOutputStream fos;

			if (!file.exists()) {
				try {
					file.createNewFile();
					FileInputStream fis = new FileInputStream(new String(data));
					
					fos = new FileOutputStream(file);
					int len = -1;
					while((len = fis.read())!= -1){
						fos.write(data, 0, len);
					}

					fis.close();
					fos.flush();
					fos.close();

				} catch (IOException e) {
					e.printStackTrace();
				}
			}

		}
	};
/**
 * 
 * @描述  jpeg  callback  在此保存jpeg格式的图片
 * */
	PictureCallback jpegCallback = new PictureCallback() {

		@Override
		public void onPictureTaken(byte[] data, Camera camera) {

			camera.stopPreview();
			savePhoto(data);
			camera.startPreview();

		}

		private void savePhoto(byte[] data) {
			Bitmap bm = null;
			if (data != null) {
				bm = BitmapFactory.decodeByteArray(data, 0, data.length);

				String dirPath = Environment.getExternalStorageDirectory()
						.getAbsolutePath() + "/AAcamera/";
				File dirFile = new File(dirPath);
				if (!dirFile.exists()) {
					dirFile.mkdirs();
				}
				String fileName = String.valueOf(System.currentTimeMillis())
						+ ".jpeg";
				System.out.println(dirPath);
				File file = new File(dirPath + fileName);
				FileOutputStream fos;
				if (!file.exists()) {
					try {
						file.createNewFile();
						fos = new FileOutputStream(file);

						bm.compress(CompressFormat.JPEG, 100, fos);
						fos.flush();
						fos.close();

					} catch (IOException e) {
						e.printStackTrace();
					}
				}
			}

		}
	};

	public CameraView(Context context) {
		super(context);
	}

	public CameraView(Context context, AttributeSet attrs, int defStyle) {
		super(context, attrs, defStyle);
	}

	public CameraView(Context context, AttributeSet attrs) {
		super(context, attrs);
		holder = this.getHolder();
//		holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);//已经废除，去掉不会报错
		holder.addCallback(this);
	}

	@Override
	public void surfaceChanged(SurfaceHolder holder, int format, int width,
			int height) {
		//这几个参数设置并未看到效果
/*		para = camera.getParameters();
		para.setPictureSize(1024, 768);
		para.setPictureFormat(PixelFormat.JPEG);
		para.setFlashMode(Parameters.FLASH_MODE_ON);
		para.setPreviewSize(1024, 768);*/
		camera.startPreview();
	}

	public void takePhoto() {

		camera.takePicture(null, null, null, jpegCallback);
//		camera.takePicture(null, null, raw, null);

	}

	@Override
	public void surfaceCreated(SurfaceHolder holder) {
		try {
			camera = Camera.open(0);//如果有多个摄像头，这里可以设置成不同的摄像头
			camera.setPreviewDisplay(holder);

		} catch (IOException e) {
			e.printStackTrace();
			camera.release();
			camera = null;
		}

	}

	@Override
	public void surfaceDestroyed(SurfaceHolder holder) {
		camera.release();

	}

}

 

 

 

在布局文件中去使用

 <com.saya.mycamera.CameraView
        android:id="@+id/cv"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_weight="0.58" />

 

今天很长一段时间，我这样使用都报错，说我包含这个控件的xml有问题，原来我在CameraView中只写了

	public CameraView(Context context) {
		super(context);
	}

 这个构造方法，把这个带属性的构造方法加上就可以使用了。

	public CameraView(Context context, AttributeSet attrs) {
		super(context, attrs);
		holder = this.getHolder();
//		holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);//已经废除，去掉不会报错
		holder.addCallback(this);
	}

 

 

在Activity中去使用

public class CameraActivity extends Activity implements OnClickListener {

	private CameraView cv;
	private Button takePhoto;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_camera);
		cv = (CameraView) findViewById(R.id.cv);
		takePhoto = (Button) findViewById(R.id.takePhoto);
		takePhoto.setOnClickListener(this);

	}

	@Override
	public void onClick(View v) {

		cv.takePhoto();

	}

}

 

 

存储原始文件，以及照片的设置还没有成功，明天继续。