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。
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1" >
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" />
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" />
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));
press(CompressFormat.JPEG, 75, outputStream);
outputStream.flush();
outputStream.close();
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
}
参考文献： /yanzi1225627/article/details/8580034
