我正在构建适用于Android的应用,但设备确实有方形屏幕。屏幕为320x320,相机应用程序使用SurfaceView显示预览,如下所示:
mCameraView = (SurfaceView) findViewById(R.id.surface);
LayoutParams params = mCameraView.getLayoutParams();
int camera_dimension = getResources().getInteger(R.integer.camera_dimension);
params.height = camera_dimension; //320px
params.width = camera_dimension;
mCameraView.setLayoutParams(params);
mCameraViewHolder = mCameraView.getHolder();
mCameraViewHolder.addCallback(this);
mCameraViewHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
在Surface上更改了,我正在做这个并且它可以工作,但支持者预览是w480 x h320
public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
int mWidth = w;
int mHeight = h;
int mFormat = format;
try {
mCameraAccess.mCamera.stopPreview();
} catch (Exception e){
// ignore: tried to stop a non-existent preview
}
Camera.Parameters param = mCameraAccess.mCamera.getParameters();
List<Camera.Size> SupportedPreview = param.getSupportedPreviewSizes();
int ScreenSize = getResources().getInteger(R.integer.camera_dimension);
for (int i = 0; i < SupportedPreview.size(); i++) {
if (SupportedPreview.get(i).height == ScreenSize) {
param.setPreviewSize(SupportedPreview.get(i).width, SupportedPreview.get(i).height);
break;
}
}
mCameraAccess.mCamera.setParameters(param);
mCameraAccess.mCamera.startPreview();
}
如何确保我在视图中的预览不是压缩而是一种中心作用。由于预览是一个矩形,我只需要以图像为中心的正方形。通常我使用scaleType但在Surface视图中不支持
有什么想法吗?