[英]ZBar Camera Preview Stretched Android
我正在使用Zbar在横向模式下扫描QRCode。 我在嵌套在RelativeLayout中的xml中有一个FrameLayout,并且FrameLayout的大小是300dp X 200dp。 我一直在谷歌搜索两个说,几乎阅读有关此问题的所有stackoverflow线程。 但似乎没有任何工作适合我。
这是我的代码。
public class CameraPreview extends SurfaceView implements SurfaceHolder.Callback {
private SurfaceHolder mHolder;
private Camera mCamera;
private PreviewCallback previewCallback;
private AutoFocusCallback autoFocusCallback;
public CameraPreview(Context context, Camera camera,
PreviewCallback previewCb,
AutoFocusCallback autoFocusCb) {
super(context);
mCamera = camera;
previewCallback = previewCb;
autoFocusCallback = autoFocusCb;
/*
* Set camera to continuous focus if supported, otherwise use
* software auto-focus. Only works for API level >=9.
*/
/*
Camera.Parameters parameters = camera.getParameters();
for (String f : parameters.getSupportedFocusModes()) {
if (f == Parameters.FOCUS_MODE_CONTINUOUS_PICTURE) {
mCamera.setFocusMode(Parameters.FOCUS_MODE_CONTINUOUS_PICTURE);
autoFocusCallback = null;
break;
}
}
*/
// Install a SurfaceHolder.Callback so we get notified when the
// underlying surface is created and destroyed.
mHolder = getHolder();
mHolder.addCallback(this);
// deprecated setting, but required on Android versions prior to 3.0
mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
public void surfaceCreated(SurfaceHolder holder) {
// The Surface has been created, now tell the camera where to draw the preview.
try {
if(holder != null)
{
mCamera.setPreviewDisplay(holder);
Camera.Parameters parameters = mCamera.getParameters();
List<Size> sizes = parameters.getSupportedPictureSizes();
parameters.setPictureSize(sizes.get(0).width, sizes.get(0).height); // mac dinh solution 0
parameters.set("orientation","landscape");
//parameters.setPreviewSize(viewWidth, viewHeight);
List<Size> size = parameters.getSupportedPreviewSizes();
parameters.setPreviewSize(size.get(0).width, size.get(0).height);
mCamera.setParameters(parameters);
}
} catch (IOException e) {
Log.d("DBG", "Error setting camera preview: " + e.getMessage());
}
}
public void surfaceDestroyed(SurfaceHolder holder) {
// Camera preview released in activity
}
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
/*
* If your preview can change or rotate, take care of those events here.
* Make sure to stop the preview before resizing or reformatting it.
*/
if (mHolder.getSurface() == null){
// preview surface does not exist
return;
}
// stop preview before making changes
try {
mCamera.stopPreview();
} catch (Exception e){
// ignore: tried to stop a non-existent preview
}
try {
// Hard code camera surface rotation 90 degs to match Activity view in portrait
mCamera.setDisplayOrientation(0);
mCamera.setPreviewDisplay(mHolder);
mCamera.setPreviewCallback(previewCallback);
mCamera.startPreview();
mCamera.autoFocus(autoFocusCallback);
} catch (Exception e){
Log.d("DBG", "Error starting camera preview: " + e.getMessage());
}
}
}
任何帮助将不胜感激。
谢谢
表面的宽高比(300dp X 200dp)似乎与您的相机PreviewSize之一不匹配。 首先确定您的PreviewSize( parameters.getPreviewSize()
)的长宽比,然后将表面尺寸设置为相同的长宽比。 当长宽比几乎相同时,则应取消拉伸。 希望有帮助!
阿里是对的。 您可以在此处找到基于Ali解决方案的代码。
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