网络科技建设网站,建设网站收取广告费用,湖南建设工程考试网,seo自学网视频教程csdn
问题
安卓camera1在预览时#xff0c;预览画面看起来被拉伸了#xff0e; 如图#xff0c;圆形的盖子#xff0c;变成椭圆形了#xff0e;
代码
默认流程#xff0c;如下为大致的打开摄像头并进行预览显示的代码
private Camera mCamera null;
private Surfa…csdn
问题
安卓camera1在预览时预览画面看起来被拉伸了 如图圆形的盖子变成椭圆形了
代码
默认流程如下为大致的打开摄像头并进行预览显示的代码
private Camera mCamera null;
private SurfaceView mSurfaceView null;
private SurfaceHolder holder null;mSurfaceView (SurfaceView) findViewById(R.id.surfaceView);
holder mSurfaceView.getHolder();
holder.addCallback(this);
holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);mCamera Camera.open(mCameraId);
// .... 中间设置方向等省略
mCamera.setPreviewDisplay(holder);
mCamera.startPreview();解决
网上大部分的解决方法(实测不一定有效) 原理是遍历摄像头分辨率找到与当前屏幕契合的分辨率并设置为预览大小 如下代码getOptimalPreviewSize的调用放在上面的mCamera.startPreview();之前
Camera.Parameters parameters null;
parameters mCamera.getParameters();
DisplayMetrics dm getResources().getDisplayMetrics();
ListSize previewSizes parameters.getSupportedPreviewSizes();
Size previewSize getOptimalPreviewSize(previewSizes, dm.widthPixels, dm.heightPixels);
parameters.setPreviewSize(previewSize.width, previewSize.height);private Size getOptimalPreviewSize(ListSize sizes, int w, int h) {final double ASPECT_TOLERANCE 0.1;double targetRatio (double) w / h;if (sizes null)return null;Size optimalSize null;double minDiff Double.MAX_VALUE;int targetHeight h;// Try to find an size match aspect ratio and sizefor (Size size : sizes) {double ratio (double) size.width / size.height;if (Math.abs(ratio - targetRatio) ASPECT_TOLERANCE)continue;int tempDiff Math.abs(size.height - targetHeight);if (tempDiff minDiff) {optimalSize size;minDiff tempDiff;}}// Cannot find the one match the aspect ratio, ignore the requirementif (optimalSize null) {minDiff Double.MAX_VALUE;for (Size size : sizes) {if (Math.abs(size.height - targetHeight) minDiff) {optimalSize size;minDiff Math.abs(size.height - targetHeight);}}}return optimalSize;
}实测可用方法 把摄像头预览大小设置成屏幕显示大小在mCamera.startPreview()调用如下代码
public static void setCameraPreviewSize(Camera camera) {WindowManager manager (WindowManager) FactoryTestApplication.getContext().getSystemService(Context.WINDOW_SERVICE);Display display manager.getDefaultDisplay();Parameters parameters camera.getParameters();parameters.setPreviewSize(display.getHeight(), display.getWidth());camera.setParameters(parameters);
}显示正常图如下 作者帅得不敢出门 csdn原创谢绝转载
