我有一个应用程序，其中照片的预览尺寸小于手机屏幕。我已经阅读了很多关于如何解决此问题的帖子/想法，但我的预览仍然失真。
理想情况下，我可以保持预览区域设置它的状态并“拉伸并重新居中”预览，这样照片的边缘就不会显示在屏幕上。
据我所知，我得到了照片的高度和宽度以及照片的高度和宽度的所有正确值，但我不确定在哪里或如何调整拉伸因子。现在，640x480（或任何尺寸）的照片被塞进了较小的预览区域。
这是我正在使用的代码：
class Preview extends SurfaceView implements SurfaceHolder.Callback {
SurfaceHolder mHolder;
public Camera camera;
boolean writingFile = false;
Size theBiggest=null;
Size screenSize=null;
Float cameraRatio=null;
Preview(Context context) {
super(context);
// Install a SurfaceHolder.Callback so we get notified when the
// underlying surface is created and destroyed.
mHolder = getHolder();
mHolder.addCallback(this);
mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
//
// surfaceCreate is called the first time the Camera Tab is loaded
//
public void surfaceCreated(SurfaceHolder holder) {
// The Surface has been created, acquire the camera and tell it where to draw.
camera = Camera.open();
camera.setDisplayOrientation(90);
// Get For Photo Size
Parameters camparams = camera.getParameters();
// Find the Largest Possible Photo Size
List<Size> sizes = camparams.getSupportedPictureSizes();
int maxWidth = 0;
int maxHeight = 0;
for (Size s : sizes) {
if (s.width > maxWidth || s.height > maxHeight) {
maxWidth = s.width;
maxHeight = s.height;
theBiggest = s;
}
}
// Set Photo Size
camparams.setPictureSize(theBiggest.width, theBiggest.height);
camera.setParameters(camparams);
} // end surfaceCreate()
public void surfaceDestroyed(SurfaceHolder holder) {
// Surface will be destroyed when we return, so stop the preview.
// Because the CameraDevice object is not a shared resource, it's very
// important to release it when the activity is paused.
camera.setPreviewCallback(null);
camera.stopPreview();
camera.release();
camera = null;
}
public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
// Now that the size is known, set up the camera parameters and begin
// the preview.
camera.setDisplayOrientation(90);
Camera.Parameters parameters = camera.getParameters();
Camera.Size size = getBestPreviewSize(w, h);
parameters.setPreviewSize(size.width, size.height); // preview size
camera.setParameters(parameters);
camera.startPreview();
}
private Camera.Size getBestPreviewSize(int width, int height)
{
// Get For Photo Size
Camera.Parameters camparams = camera.getParameters();
// Find the Largest Possible Preview Sizes
List<Size> sizes = camparams.getSupportedPreviewSizes();
Camera.Size result=null;
for (Size s : sizes) {
if (s.width <= width && s.height <= height) {
if (result == null) {
result = s;
} else {
int resultArea=result.width*result.height;
int newArea=s.width*s.height;
if (newArea>resultArea) {
result=s;
}
} // end else (result=null)
} // end if (width<width&&height<height)
} // end for
return result;
} // end function
}
这是我的布局 xml 文件
<FrameLayout android:layout_weight="1"
android:id="@+id/preview"
android:fitsSystemWindows="true"
android:layout_height="0dp"
android:layout_width="wrap_content">
</FrameLayout>
<Button android:text="Take Photo"
android:id="@+id/buttonClick"
android:layout_height="wrap_content"
android:layout_width="200dp"
android:layout_gravity="center"
android:textSize="12sp">
</Button>