我正在使用Google的API2相机，并在我的代码中遇到了一些问题。我有两个不同的CameraSessions，一个用于视频，另一个用于图像。为了更有效率，我更改了代码以使用唯一的Session并使应用程序更高效。
但是，我更改后发现我的相机预览不正常。当我使用4:3宽高比时，我的预览会在高度上被拉伸。而当我使用16:9比例时，它看起来很好。在这两种情况下，我的图片看起来都很好，我的预览不正确，但我拍摄的照片具有正确的宽高比。
我已经检查了不同的帖子，有相同的问题： Camera Preview Stretched on Few Android Devices Camera display / preview in full screen does not maintain aspect ratio - image is skewed, stretched in order to fit on the screen
但是，我更改后发现我的相机预览不正常。当我使用4:3宽高比时，我的预览会在高度上被拉伸。而当我使用16:9比例时，它看起来很好。在这两种情况下，我的图片看起来都很好，我的预览不正确，但我拍摄的照片具有正确的宽高比。
我已经检查了不同的帖子，有相同的问题： Camera Preview Stretched on Few Android Devices Camera display / preview in full screen does not maintain aspect ratio - image is skewed, stretched in order to fit on the screen
但是不同的答案并没有帮助我。我知道问题在我的onMeasure()、setTransformMatrix()或OnLayoutChangeListener()方法内，但我不知道哪里出了问题。
现在请忽略有关旋转的代码，因为它是动态的。它总是进入else条件。
这是我的代码:
private OnLayoutChangeListener mLayoutListener = new OnLayoutChangeListener() {
@Override
public void onLayoutChange(View v, int left, int top, int right,
int bottom, int oldLeft, int oldTop, int oldRight, int oldBottom) {
Log.d(TAG, "[onLayoutChange] " + mCameraUI.getTextureView().getMeasuredWidth() + "x" + mCameraUI.getTextureView().getMeasuredHeight());
int width = right - left;
int height = bottom - top;
if (mPreviewWidth != width || mPreviewHeight != height
|| (mOrientationResize != mPrevOrientationResize)
|| mAspectRatioResize || mOrientationChanged) {
Log.i(TAG, "[onLayoutChange] Layout changed");
mPreviewWidth = width;
mPreviewHeight = height;
Log.i(TAG, "[onLayoutChange] Preview size: "+ mPreviewWidth + "x" + mPreviewHeight);
setTransformMatrix(width, height);
mController.onScreenSizeChanged((int) mSurfaceTextureUncroppedWidth,
(int) mSurfaceTextureUncroppedHeight);
mAspectRatioResize = false;
mOrientationChanged = true;
}
}
};
setTransform
private void setTransformMatrix(int width, int height) {
Log.i(TAG, "Screen: " + mPreviewWidth + "x" + mPreviewHeight);
mMatrix = new Matrix();
//mCameraUI.getTextureView().getTransform(mMatrix);
float scaleX = 1f, scaleY = 1f;
float scaledTextureWidth, scaledTextureHeight;
mAspectRatio= (float)height/(float)width;
if (mAspectRatio==(4f / 3f)){
scaledTextureWidth = Math.max(width,
(int) (height / mAspectRatio));
scaledTextureHeight = Math.max(height,
(int) (width * mAspectRatio));
Log.i(TAG, "[PhotoUIManager]: Aspect Ratio 4:3=" + scaledTextureWidth + "x" + scaledTextureHeight );
}
else{
scaledTextureWidth = Math.max(width,
(int) (height / mAspectRatio));
scaledTextureHeight = Math.max(height,
(int) (width * mAspectRatio));
Log.i(TAG, "[PhotoUIManager]: Aspect Ratio 16:9=" + scaledTextureWidth + "x" + scaledTextureHeight );
}
if (mSurfaceTextureUncroppedWidth != scaledTextureWidth || mSurfaceTextureUncroppedHeight != scaledTextureHeight) {
Log.e(TAG,"mi SurfaceWidth = " + mSurfaceTextureUncroppedWidth + "and mi scaledWidth=" + scaledTextureWidth);
Log.e(TAG,"mi SurfaceHeigh = " + mSurfaceTextureUncroppedHeight + "and mi scaledHeight=" + scaledTextureHeight);
mSurfaceTextureUncroppedWidth = scaledTextureWidth;
mSurfaceTextureUncroppedHeight = scaledTextureHeight;
Log.e(TAG,"Surfaces: " + mSurfaceTextureUncroppedWidth + "x" + mSurfaceTextureUncroppedHeight);
if (mSurfaceTextureSizeListener != null) {
mSurfaceTextureSizeListener.onSurfaceTextureSizeChanged(
(int) mSurfaceTextureUncroppedWidth, (int) mSurfaceTextureUncroppedHeight);
}
}
scaleX = scaledTextureWidth / width;
scaleY = scaledTextureHeight / height;
mMatrix.setScale(scaleX, scaleY, scaledTextureWidth/2, scaledTextureHeight/2);
Log.e(TAG, "scale: X= " + scaleX + " Y=" + scaleY + "Width= " + scaledTextureWidth + "Height= " + scaledTextureHeight);
// init the position (this seems to be necessary too when the ratio is 16/9
mCameraUI.getTextureView().setX(0);
mCameraUI.getTextureView().setY(0);
// Translate the preview with the rotation is aspect ration is 4/3
if (mAspectRatio == 4f / 3f) {
Log.e(TAG, "aspect ratio standard");
float verticalTranslateOffset = (mCameraUI.getTextureView().getMeasuredHeight() - scaledTextureHeight) / 2;
float horizontalTranslateOffset = (mCameraUI.getTextureView().getMeasuredWidth() - scaledTextureWidth) / 2;
int rotation = CameraUtil.getDisplayRotation(mActivity);
switch (rotation) {
case 0:
// phone portrait; translate the preview up
mCameraUI.getTextureView().setY(-verticalTranslateOffset);
mFaceView.setStandardPreviewTranslationOffset(-verticalTranslateOffset);
mFocusView.setStandardPreviewTranslationOffset(-verticalTranslateOffset);
break;
case 90:
// phone landscape: translate the preview left
mCameraUI.getTextureView().setX(-horizontalTranslateOffset);
mFaceView.setStandardPreviewTranslationOffset(-horizontalTranslateOffset);
mFocusView.setStandardPreviewTranslationOffset(-horizontalTranslateOffset);
break;
case 180:
// phone upside down: translate the preview bottom
mCameraUI.getTextureView().setY(verticalTranslateOffset);
mFaceView.setStandardPreviewTranslationOffset(verticalTranslateOffset);
mFocusView.setStandardPreviewTranslationOffset(verticalTranslateOffset);
break;
case 270:
// reverse landscape: translate the preview right
mCameraUI.getTextureView().setX(horizontalTranslateOffset);
mFaceView.setStandardPreviewTranslationOffset(horizontalTranslateOffset);
mFocusView.setStandardPreviewTranslationOffset(horizontalTranslateOffset);
break;
}
} else {
Log.e(TAG, "aspect ratio full");
mFaceView.setStandardPreviewTranslationOffset(0);
mFocusView.setStandardPreviewTranslationOffset(0);
}
mRenderOverlay.updateLayout();
mCameraUI.getTextureView().setTransform(mMatrix);
RectF previewRect = new RectF(0, 0, width, height);
mController.onPreviewRectChanged(CameraUtil.rectFToRect(previewRect));
}
onMeasure
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int width = MeasureSpec.getSize(widthMeasureSpec);
int height = MeasureSpec.getSize(heightMeasureSpec);
Log.d(TAG, "onMeasure PREVIOUS. Width x Height [" + widthMeasureSpec + " = " + width + "x" + heightMeasureSpec + " = " + height + "]");
int rotation = ((Activity) getContext()).getWindowManager().getDefaultDisplay().getRotation();
boolean isInHorizontal = Surface.ROTATION_90 == rotation || Surface.ROTATION_270 == rotation;
int newWidth;
int newHeight;
if (isInHorizontal) {
newHeight = getMeasuredHeight();
newWidth = (int) (newHeight * mAspectRatio);
} else {
newWidth = getMeasuredWidth();
newHeight = (int) (newWidth * mAspectRatio);
}
setMeasuredDimension(newWidth, newHeight);
Log.d(TAG, "onMeasure. Width x Height [" + newWidth + "x" + newHeight + "]");
}