我正在玩Google的API2相机，我的代码存在问题。我有两个不同的CameraSession，一个用于视频，另一个用于图像。为了更有效地执行此操作，我将代码更改为使用唯一的会话并使应用程序更高效。
在我这样做之后，我的相机预览功能不足。当我使用4：3宽高比时，我的预览会在高处伸展。换句话说，当我使用16：9的比例时它看起来很好。在这两种情况下，我的照片看起来很好，我的意思是，预览不能正常工作，但我拍摄的照片具有正确的宽高比。
我已经检查了同样问题的不同帖子：Camera Preview Stretched on Few Android Devices
但是不同的答案对我没有帮助。我知道问题出在我的onMeasure()，setTransformMatrix()或OnLayoutChangeListener()方法中，但我不知道我做错了什么。
忽略关于旋转的代码，现在它是动态的。它总是进入其他条件。
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;
}
}
};
集的形式
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 + "]");
}
解决了！
我有一个我的纹理的BufferSize的默认值，当我在新的会话中或在更改后的比例后重新启动它。但是纹理的宽度和高度值没有用比率更新，因此它会一次又一次地拉伸。
我解决了它使用PreviewSizes更改我的defaultbufferSize，我总是更新我更新比率。
public void createCameraPreviewSession(Size previewsize, Surface recordingSurface) {
try {
if (mCaptureSession != null) {
mCaptureSession.stopRepeating();
mCaptureSession.close();
mCaptureSession = null;
}
SurfaceTexture texture = mTextureView.getSurfaceTexture();
assert texture != null;
List<Surface> surfaces = new ArrayList<Surface>();
// We configure the size of default buffer to be the size of camera preview we want.
texture.setDefaultBufferSize(previewsize.getWidth(),previewsize.getHeight());
;
// This is the output Surface we need to start preview.
Surface surface = new Surface(texture);
.......