android camera摄像surfaceview预览界面特定区域（该区域可移动）

1.自定义一个imageview用来设定surfaceview上的特定区域。

public class DrawImageView extends ImageView {
	private Paint paint;
	private int mFristPointX = 100, mFristPointY = 200;
	private int mSecondPointX = 400, mSecondPointY = 500;
	private boolean isFirstDown = true;

	private int mOldX = 0, mOldY = 0;

	public DrawImageView(Context context) {
		super(context);
		// TODO Auto-generated constructor stub
		init();
	}

	public DrawImageView(Context context, AttributeSet attrs) {
		super(context, attrs);
		// TODO Auto-generated constructor stub
		init();
	}

	private void init() {
		paint = new Paint();
		paint.setAntiAlias(true);
		paint.setColor(Color.RED);
		paint.setStyle(Style.STROKE);
		paint.setStrokeWidth(2.5f);
		paint.setAlpha(100);
	}

	@Override
	protected void onDraw(Canvas canvas) {
		// TODO Auto-generated method stub
		super.onDraw(canvas);
		canvas.drawRect(new Rect(getmFristPointX(), getmFristPointY(), getmSecondPointX(), getmSecondPointY()), paint);
	}

	@Override
	public boolean onTouchEvent(MotionEvent event) {
		// TODO Auto-generated method stub
		if (event.getAction() != MotionEvent.ACTION_UP) {
			int x = (int) event.getX();
			int y = (int) event.getY();
			Rect mRect = new Rect(getmFristPointX(), getmFristPointY(), getmSecondPointX(), getmSecondPointY());
			if (mRect.contains(x, y)) {
				if (isFirstDown) {
					mOldX = x;
					mOldY = y;
					isFirstDown = false;
				} else {
					int mXDis = x - mOldX;
					int mYDis = y - mOldY;
					mOldX = x;
					mOldY = y;
					ReSetVaue(mXDis, mYDis);
				}
			}
		} else {
			isFirstDown = true;
		}
		return true;
	}

	public void setValue(int x, int y) {
		setmFristPointX(x - 50);
		setmFristPointY(y - 50);
		setmSecondPointX(x + 50);
		setmSecondPointY(y + 50);
		invalidate();
	}

	public void ReSetVaue(int xDis, int yDis) {
		setmFristPointX(getmFristPointX() + xDis);
		setmFristPointY(getmFristPointY() + yDis);
		setmSecondPointX(getmFristPointX() + 100);
		setmSecondPointY(getmFristPointY() + 100);
		invalidate();
	}

	public int getmFristPointX() {
		return mFristPointX;
	}

	public void setmFristPointX(int mFristPointX) {
		this.mFristPointX = mFristPointX;
	}

	public int getmFristPointY() {
		return mFristPointY;
	}

	public void setmFristPointY(int mFristPointY) {
		this.mFristPointY = mFristPointY;
	}

	public int getmSecondPointX() {
		return mSecondPointX;
	}

	public void setmSecondPointX(int mSecondPointX) {
		this.mSecondPointX = mSecondPointX;
	}

	public int getmSecondPointY() {
		return mSecondPointY;
	}

	public void setmSecondPointY(int mSeconPointY) {
		this.mSecondPointY = mSeconPointY;
	}

}

 2.定义xml布局。

<FrameLayout
                android:layout_width="fill_parent"
                android:layout_height="fill_parent"
                android:layout_weight="1" >

                <SurfaceView
                    android:id="@+id/open_camera"
                    android:layout_width="fill_parent"
                    android:layout_height="fill_parent"
                    android:layout_marginLeft="30dp"
                    android:layout_marginRight="30dp"
                    android:layout_marginTop="15dp" />

                <test.camera.cut.DrawImageView
                    android:id="@+id/draw_rect"
                    android:layout_width="fill_parent"
                    android:layout_height="fill_parent"
                    android:layout_marginLeft="30dp"
                    android:layout_marginRight="30dp"
                    android:layout_marginTop="15dp" />
            </FrameLayout>

 3.在surfaceChanged中设置参数开始画区域：

DrawImageView.onDraw(new Canvas());
    DrawImageView.setValue(mFirstPointX, mFirstPointY);//左上角点的值

 4.在camera拍照部分进行压缩裁剪。

private Bitmap mBitmap;

	private Camera.PictureCallback takePictureCallback = new Camera.PictureCallback() {

		@Override
		public void onPictureTaken(byte[] data, Camera camera) {
			// TODO Auto-generated method stub

			if (data != null) {
				mBitmap = BitmapFactory.decodeByteArray(data, 0, data.length);
				camera.stopPreview();
			}
			Matrix matrix = new Matrix();
			matrix.setRotate(90);
			Bitmap rotaBitmap = Bitmap.createBitmap(mBitmap, 0, 0, mBitmap.getWidth(), mBitmap.getHeight(), matrix, false);

			getSurfaceSize();
			Bitmap sizeBitmap = Bitmap.createScaledBitmap(rotaBitmap, SurView_Width, SurView_Height, true);
			SaveBitmap(sizeBitmap);
			mFirstPointX = mDrawImageView.getmFristPointX() + 50;
			mFirstPointY = mDrawImageView.getmFristPointY() + 50;

			Bitmap newBitmap = Bitmap.createBitmap(sizeBitmap, mFirstPointX - 50, mFirstPointY - 50, 100, 100);

			if (newBitmap != null) {
				mTestImageView.setImageBitmap(newBitmap);
			}

			camera.startPreview();

		}
	};
	
	private void getSurfaceSize(){
		SurView_Width = mSurfaceView.getWidth();
		SurView_Height = mSurfaceView.getHeight();
	}

	private void SaveBitmap(Bitmap bitmap) {
		File mpicture = new File(mPath + File.separator + "pic.jpg");
		try {
			mpicture.createNewFile();
			BufferedOutputStream outputStream = new BufferedOutputStream(new FileOutputStream(mpicture));
			bitmap.compress(CompressFormat.JPEG, 75, outputStream);
			outputStream.flush();
			outputStream.close();
		} catch (Exception e) {
			// TODO: handle exception
			e.printStackTrace();
		}
	}

参考文献：  http://blog.csdn.net/yanzi1225627/article/details/8580034