我也有同样的问题,我已经解决了!这是我的解决方案:
首先,在CameraBridgeViewBase.Java
文件中的两个构造函数中添加WindowManager的初始化:
public CameraBridgeViewBase(Context context, int cameraId) {
super(context);
mCameraIndex = cameraId;
getHolder().addCallback(this);
mMaxWidth = MAX_UNSPECIFIED;
mMaxHeight = MAX_UNSPECIFIED;
windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
}
public CameraBridgeViewBase(Context context, AttributeSet attrs) {
super(context, attrs);
int count = attrs.getAttributeCount();
Log.d(TAG, "Attr count: " + Integer.valueOf(count));
TypedArray styledAttrs = getContext().obtainStyledAttributes(attrs, R.styleable.CameraBridgeViewBase);
if (styledAttrs.getBoolean(R.styleable.CameraBridgeViewBase_show_fps, false))
enableFpsMeter();
mCameraIndex = styledAttrs.getInt(R.styleable.CameraBridgeViewBase_camera_id, -1);
getHolder().addCallback(this);
mMaxWidth = MAX_UNSPECIFIED;
mMaxHeight = MAX_UNSPECIFIED;
windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
styledAttrs.recycle();
}
那么,您需要将函数deliverAndDrawFrame(CvCameraViewFrame frame)
替换为以下内容:
protected void deliverAndDrawFrame(CvCameraViewFrame frame) {
Mat modified;
if (mListener != null) {
modified = mListener.onCameraFrame(frame);
} else {
modified = frame.rgba();
}
boolean bmpValid = true;
if (modified != null) {
try {
Utils.matToBitmap(modified, mCacheBitmap);
} catch (Exception e) {
Log.e(TAG, "Mat type: " + modified);
Log.e(TAG, "Bitmap type: " + mCacheBitmap.getWidth() + "*" + mCacheBitmap.getHeight());
Log.e(TAG, "Utils.matToBitmap() throws an exception: " + e.getMessage());
bmpValid = false;
}
}
if (bmpValid && mCacheBitmap != null) {
Canvas canvas = getHolder().lockCanvas();
if (canvas != null) {
canvas.drawColor(0, android.graphics.PorterDuff.Mode.CLEAR);
int rotation = windowManager.getDefaultDisplay().getRotation();
int degrees = 0;
switch (rotation) {
case Surface.ROTATION_0:
degrees = 90;
break;
case Surface.ROTATION_90:
degrees = 0;
break;
case Surface.ROTATION_180:
degrees = 270;
break;
case Surface.ROTATION_270:
degrees = 180;
break;
}
Matrix matrix = new Matrix();
matrix.postRotate(degrees);
Bitmap outputBitmap = Bitmap.createBitmap(mCacheBitmap, 0, 0, mCacheBitmap.getWidth(), mCacheBitmap.getHeight(), matrix, true);
if (outputBitmap.getWidth() <= canvas.getWidth()) {
mScale = getRatio(outputBitmap.getWidth(), outputBitmap.getHeight(), canvas.getWidth(), canvas.getHeight());
} else {
mScale = getRatio(canvas.getWidth(), canvas.getHeight(), outputBitmap.getWidth(), outputBitmap.getHeight());
}
if (mScale != 0) {
canvas.scale(mScale, mScale, 0, 0);
}
Log.d(TAG, "mStretch value: " + mScale);
canvas.drawBitmap(outputBitmap, 0, 0, null);
if (mFpsMeter != null) {
mFpsMeter.measure();
mFpsMeter.draw(canvas, 20, 30);
}
getHolder().unlockCanvasAndPost(canvas);
}
}
}
并且添加这个额外的功能,
private float getRatio(int widthSource, int heightSource, int widthTarget, int heightTarget) {
if (widthTarget <= heightTarget) {
return (float) heightTarget / (float) heightSource;
} else {
return (float) widthTarget / (float) widthSource;
}
}
没问题,如果这个答案对您有用,请标记为“接受”的帮助声誉。