有人可能我做错了…我想用SurfaceView捕获我有预览屏幕的图像.我能够在表面视图上显示预览.
这是我捕获图像的代码
if (mCameraSession == null && mCameraDevice == null) return;
ImageReader reader = ImageReader.newInstance(mTexturePreviewSize.getWidth(),mTexturePreviewSize.getHeight(),ImageFormat.JPEG,1);
reader.setOnImageAvailableListener(imageAvailableListener,mBackgroundHandler);
Surface surface = reader.getSurface();
try {
CaptureRequest.Builder requestBuilder = mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_STILL_CAPTURE);
requestBuilder.addTarget(surface);
mCameraSession.capture(requestBuilder.build(),sessionCaptureListener,null);
以下是我收到的错误消息.
java.lang.IllegalArgumentException: Bad argument passed to camera service
at android.hardware.camera2.utils.CameraBinderDecorator.throwOnError(CameraBinderDecorator.java:114)
at android.hardware.camera2.utils.CameraBinderDecorator$CameraBinderDecoratorListener.onAfterInvocation(CameraBinderDecorator.java:73)
at android.hardware.camera2.utils.Decorator.invoke(Decorator.java:81)
at java.lang.reflect.Proxy.invoke(Proxy.java:397)
at $Proxy2.submitRequestList(Unknown Source)
at android.hardware.camera2.impl.CameraDeviceImpl.submitCaptureRequest(CameraDeviceImpl.java:617)
at android.hardware.camera2.impl.CameraDeviceImpl.capture(CameraDeviceImpl.java:503)
at android.hardware.camera2.impl.CameraCaptureSessionImpl.capture(CameraCaptureSessionImpl.java:161)
at Control.CameraApi21Plus.captureSinglePhoto(CameraApi21Plus.java:171)
at com.CameraActivity$2.onClick(CameraActivity.java:108)
捕获单个照片功能：
public void captureSinglePhoto() {
if (mCameraSession == null && mCameraDevice == null) return;
ImageReader reader = ImageReader.newInstance(mTexturePreviewSize.getWidth(),mBackgroundHandler);
Surface surface = reader.getSurface();
try {
CaptureRequest.Builder requestBuilder = mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_STILL_CAPTURE);
requestBuilder.addTarget(surface);
mCameraSession.stopRepeating();
mCameraSession.capture(requestBuilder.build(),null);
} catch (CameraAccessException e) {
e.printStackTrace();
}
}
private ImageReader.OnImageAvailableListener imageAvailableListener = new ImageReader.OnImageAvailableListener()
{
@Override
public void onImageAvailable(ImageReader reader) {
Image img = reader.acquireLatestImage();
}
};
private CameraCaptureSession.CaptureCallback sessionCaptureListener = new CameraCaptureSession.CaptureCallback() {
@Override
public void onCaptureCompleted(CameraCaptureSession session,CaptureRequest request,TotalCaptureResult result) {
//super.onCaptureCompleted(session,request,result);
}
};
解决方法
您只能捕获为会话配置的曲面,因此您应该在创建会话之前准备曲面.
在官方文件中：
IllegalArgumentException if the request targets no Surfaces or
Surfaces that are not configured as outputs for this session; …
就像那里一样,您需要在创建会话时准备好表面mImageReader.getSurface()
mCameraDevice.createCaptureSession(Arrays.asList(surface,mImageReader.getSurface()),new CameraCaptureSession.StateCallback() {
...
},null);
官方样本：
