我遇到了 Camera.setParameters 问题，下面是我注意到的问题，
在 Nexus 上，SurfaceView(w, h) 是 1080-1776，最佳尺寸是 W:1600-H:1200，当我设置参数时它工作正常
--------Nexus--------
SurfaceView(w, h) 1080-1776
Available cam sizes
size 1920-1080
size 1600-1200
size 1280-960
size 1280-768
size 1280-720
size 1024-768
size 800-600
size 800-480
size 720-480
size 640-480
size 352-288
size 320-240
size 176-144
optimalSize 1600-1200
============================================= ================================================ =
下面是三星的，这里崩溃了，我已经尝试在 Camera.setParameters 中用 H 切换 W，它也崩溃了，我尝试了每个可用的单一尺寸，但都崩溃了
--------Samsung Back camera--------
SurfaceView(w, h) 1080-1920
Available cam sizes
size 1920-1080
size 1440-1080
size 1280-720
size 1056-864
size 960-720
size 720-480
size 640-480
size 320-240
size 176-144
optimalSize 1920-1080
这里是令人困惑的部分，
当我尝试使用 Camera.open(1) 而不是 Camera.open(0) 时，前置摄像头成功了!!
--------Samsung front-facing camera--------
SurfaceView(w, h) 1080-1920
Available cam sizes
size 1920-1080
size 1440-1080
size 1280-720
size 1056-864
size 960-720
size 720-480
size 640-480
size 320-240
size 176-144
optimalSize 1920-1080
我正在使用的代码如下，有人可以告诉我发生了什么吗
class Preview extends ViewGroup implements SurfaceHolder.Callback {
private final String TAG = "Preview";
SurfaceView mSurfaceView;
SurfaceHolder mHolder;
Camera.Size mPreviewSize;
List<Camera.Size> mSupportedPreviewSizes;
Camera mCamera;
Context mContext;
int screenWidth;
int screenHeight;
Preview(Context context, SurfaceView sv, int width, int height) {
super(context);
mSurfaceView = sv;
// addView(mSurfaceView);
mHolder = mSurfaceView.getHolder();
mHolder.addCallback(this);
mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
public void setCamera(Camera camera) {
mCamera = camera;
if (mCamera != null) {
mSupportedPreviewSizes = mCamera.getParameters().getSupportedPreviewSizes();
requestLayout();
// get Camera parameters
Camera.Parameters params = mCamera.getParameters();
List<String> focusModes = params.getSupportedFocusModes();
// if (focusModes.contains(Camera.Parameters.FOCUS_MODE_AUTO)) {
// // set the focus mode
// params.setFocusMode(Camera.Parameters.FOCUS_MODE_AUTO);
// // set Camera parameters
// mCamera.setParameters(params);
// }
}
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
// We purposely disregard child measurements because act as a
// wrapper to a SurfaceView that centers the camera preview instead
// of stretching it.
final int width = resolveSize(getSuggestedMinimumWidth(), widthMeasureSpec);
final int height = resolveSize(getSuggestedMinimumHeight(), heightMeasureSpec);
setMeasuredDimension(width, height);
if (mSupportedPreviewSizes != null) {
mPreviewSize = getOptimalPreviewSize(mSupportedPreviewSizes, width, height);
}
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
if (changed && getChildCount() > 0) {
final View child = getChildAt(0);
final int width = r - l;
final int height = b - t;
int previewWidth = width;
int previewHeight = height;
if (mPreviewSize != null) {
previewWidth = mPreviewSize.width;
previewHeight = mPreviewSize.height;
}
// Center the child SurfaceView within the parent.
if (width * previewHeight > height * previewWidth) {
final int scaledChildWidth = previewWidth * height / previewHeight;
child.layout((width - scaledChildWidth) / 2, 0,
(width + scaledChildWidth) / 2, height);
} else {
final int scaledChildHeight = previewHeight * width / previewWidth;
child.layout(0, (height - scaledChildHeight) / 2,
width, (height + scaledChildHeight) / 2);
}
}
}
public void surfaceCreated(SurfaceHolder holder) {
// The Surface has been created, acquire the camera and tell it where
// to draw.
try {
if (mCamera != null) {
mCamera.setPreviewDisplay(holder);
}
} catch (IOException exception) {
Log.e(TAG, "IOException caused by setPreviewDisplay()", exception);
}
}
public void surfaceDestroyed(SurfaceHolder holder) {
// Surface will be destroyed when we return, so stop the preview.
if (mCamera != null) {
mCamera.stopPreview();
}
}
private Camera.Size getOptimalPreviewSize(List<Camera.Size> sizes, int w, int h) {
final double ASPECT_TOLERANCE = 0.1;
double targetRatio = (double) w / h;
if (sizes == null) return null;
Camera.Size optimalSize = null;
double minDiff = Double.MAX_VALUE;
int targetHeight = h;
for (Camera.Size size : sizes) {
Log.d("CamSettings", "size "+ size.width +"-"+ size.height);
}
// Try to find an size match aspect ratio and 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);
}
}
// Cannot find the one match the aspect ratio, ignore the requirement
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);
}
}
}
Log.d("CamSettings", "optimalSize "+ optimalSize.width +"-"+ optimalSize.height);
return optimalSize;
}
public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
if(mCamera != null) {
mCamera.setDisplayOrientation(90);
Camera.Parameters parameters = mCamera.getParameters();
Log.d("CamSettings", "SurfaceView " + w + "-" + h);
Camera.Size sc = getOptimalPreviewSize(parameters.getSupportedPreviewSizes(), w, h);
parameters.setPreviewSize(sc.width, sc.height);
parameters.setPictureSize(sc.width, sc.height);
// Camera.Size captureSize = determineBestPictureSize(parameters);
requestLayout();
mCamera.setParameters(parameters);
mCamera.startPreview();
}
}
崩溃是这样的
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.camtest1, PID: 21832
java.lang.RuntimeException: setParameters failed
at android.hardware.Camera.native_setParameters(Native Method)
at android.hardware.Camera.setParameters(Camera.java:1701)
at com.example.camtest1.Preview.surfaceChanged(Preview.java:174)
at android.view.SurfaceView.updateWindow(SurfaceView.java:611)
at android.view.SurfaceView.access$000(SurfaceView.java:94)
at android.view.SurfaceView$3.onPreDraw(SurfaceView.java:183)
at android.view.ViewTreeObserver.dispatchOnPreDraw(ViewTreeObserver.java:895)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2222)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1267)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6638)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:813)
at android.view.Choreographer.doCallbacks(Choreographer.java:613)
at android.view.Choreographer.doFrame(Choreographer.java:583)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:799)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:146)
at android.app.ActivityThread.main(ActivityThread.java:5635)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1291)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1107)
at dalvik.system.NativeStart.main(Native Method)
---更新--- 我刚刚尝试禁用它
parameters.setPictureSize(sc.width, sc.height)
它不再崩溃了，仍在尝试查看这是否会影响纵横比
最佳答案
And here the confusing part,
When I try the Camera.open(1) instead of Camera.open(0), the fron-facing camera, it works!!
这里是您的答案。
当您使用 Camera.open() 时，它有一个重载方法，除了相机 ID Camera.open(int cameraId)。对于每个摄像头 ID，它都有自己的一组支持大小，这是合乎逻辑的，因为前置摄像头和后置摄像头具有不同的分辨率。这就是为什么您的代码使用 Camera.open(0) 而不是 Camera.open(1)
在获取相机引用后，使用这些方法为您找到正确的设置。
camera.getParameters().getSupportedVideoSizes();
camera.getParameters().getSupportedPictureSizes();
camera.getParameters().getSupportedPreviewSizes()
关于android - 相机设置参数在三星上失败 - Android，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/35370909/