一段时间以来,我一直在尝试解决这个问题,但出于某种原因,当我开始用相机录制视频时,预览会放大。我从一些示例中获得了以下代码:
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
Camera.Parameters myParameters = mCamera.getParameters();
List<Camera.Size> sizes = myParameters.getSupportedPreviewSizes();
Camera.Size myBestSize = getBestPreviewSize(sizes, width, height);
if (myBestSize != null) {
myParameters.setPreviewSize(myBestSize.width, myBestSize.height);
myParameters.setVideoStabilization(false);
mCamera.setParameters(myParameters);
mCamera.startPreview();
mCamera.unlock();
}
}
private Camera.Size getBestPreviewSize(List<Camera.Size> sizes, int width, int height) {
final double ASPECT_TOLERANCE = 0.05;
double targetRatio = (double) width / height;
if (sizes == null) return null;
Camera.Size optimalSize = null;
double minDiff = Double.MAX_VALUE;
int targetHeight = height;
// Find size
for (Camera.Size size : sizes) {
double ratio = (double) size.width / size.height;
if (Math.abs(ratio - targetRatio) > ASPECT_TOLERANCE) continue;
if (Math.abs(size.height - targetHeight) < minDiff) {
optimalSize = size;
minDiff = Math.abs(size.height - targetHeight);
}
}
if (optimalSize == null) {
minDiff = Double.MAX_VALUE;
for (Camera.Size size : sizes) {
if (Math.abs(size.height - targetHeight) < minDiff) {
optimalSize = size;
minDiff = Math.abs(size.height - targetHeight);
}
}
}
return optimalSize;
}
但在录制视频时预览仍然放大。我尝试手动将预览大小设置为 1280x720,但是,它不适用于我测试的所有设备,有些设备显示黑色 SurfaceView。
有什么方法可以防止录制视频时预览放大吗? StackOverflow 上的所有解决方案似乎都不起作用。
编辑:我尝试使用自己的 onMesaure 方法创建自定义 SurfaceView,但现在我在启动 MediaRecorder 时收到 -19 错误。 (忽略赏金中的 -16)
最佳答案
我对您所说的变焦类型感到困惑,可能是软件变焦,也可能是自动对焦,所以我会建议导致最终解决方案的不同潜在技巧:
实现 mCamera.setZoomChangeListener,例如:
mCamera.setZoomChangeListener(new Camera.OnZoomChangeListener() { @Override public void onZoomChange(int i, boolean b, Camera camera) { Log.e("StackOverflow","Zoom just changed !"); // Inspect things from here } });
禁用平滑缩放:
mCamera.stopSmoothZoom(); // My device doesn't support it, but maybe your device does
检查你所有的 Camera.Parameters:
Log.e("StackOverflow", "All Camera parameters :"); for(String s : mCamera.getParameters().flatten().split(";")) Log.e("StackOverflow", s + "\n");
然后切换任何可能与缩放相关的内容,例如:
Camera.Parameters parameters = mCamera.getParameters(); parameters.setZoom(100); // My device support some values in the range 100 | 400 parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_INFINITY); parameters.setVideoStabilization(false); // Don't forget to add the new parameters to the camera : mCamera.setParameters(parameters);
问候
关于Android Camera - 录制视频时预览放大,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/39296612/