我正在构建一个基于 Camera2 的相机应用程序，但我保存的图片与我在表面视图中看到的最新图片不匹配。预览会话似乎有效，但是当我要求捕获时，新请求会停止预览并捕获图像。表面视图冻结在最新图片上，并且在我按下快门按钮（预览运行和请求捕获）与捕获请求的 onCaptureCompleted 之间产生了间隙。
这是预览会话
private void createCameraPreviewSession() {
try {
SurfaceTexture texture = mTextureView.getSurfaceTexture();
assert texture != null;
texture.setDefaultBufferSize(mPreviewSize.getWidth(), mPreviewSize.getHeight());
Log.d(TAG, "here is the width of texture" + mPreviewSize.getWidth());
Log.d(TAG, "here is the height of texture" +mPreviewSize.getHeight());
Surface surface = new Surface(texture);
mPreviewRequestBuilder
= mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
mPreviewRequestBuilder.addTarget(surface);
mCameraDevice.createCaptureSession(Arrays.asList(surface, mImageReader.getSurface()),
new CameraCaptureSession.StateCallback() {
@Override
public void onConfigured(@NonNull CameraCaptureSession cameraCaptureSession) {
if (null == mCameraDevice) {
return;
}
mCaptureSession = cameraCaptureSession;
try {
mPreviewRequest = mPreviewRequestBuilder.build();
mCaptureSession.setRepeatingRequest(mPreviewRequest,
mCaptureCallback, mBackgroundHandler);
} catch (CameraAccessException e) {
e.printStackTrace();
}
}
@Override
public void onConfigureFailed(
@NonNull CameraCaptureSession cameraCaptureSession) {
showToast("Failed");
}
}, null
);
} catch (CameraAccessException e) {
e.printStackTrace();
}
}
mCaptureCallback 定义如下：
私人CameraCaptureSession.CaptureCallback mCaptureCallback =新CameraCaptureSession.CaptureCallback（）{
private void process(CaptureResult result) {
switch (mState) {
case STATE_PREVIEW:
break;
case STATE_CAPTURE:
mState = STATE_PREVIEW;
capturePicture();
break;
}
}
@Override
public void onCaptureProgressed(@NonNull CameraCaptureSession session,
@NonNull CaptureRequest request,
@NonNull CaptureResult partialResult) {
process(partialResult);
}
@Override
public void onCaptureCompleted(@NonNull CameraCaptureSession session,
@NonNull CaptureRequest request,
@NonNull TotalCaptureResult result) {
TotalCaptureResult iResult = result;
Log.d(TAG, "Frame on Completed: "+result.getFrameNumber());
process(result);
}
}
发生的事情是我重复预览并且它有效。该过程仅用于保持其运行，并且在将 mState 设置为 CAPTURE 之前什么都没有发生。
当我们点击快门按钮时，它被设置为捕捉。当我单击按钮时，我调用：
private void takePicture(){
try {
mFile = ImageSaver.generateNewFileImage();
mState = STATE_CAPTURE;
mCaptureSession.capture(mPreviewRequestBuilder.build(), mCaptureCallback,
mBackgroundHandler);
} catch (CameraAccessException e) {
Log.e(TAG,"Camera exception",e);
}
}
然后我调用 CapturePicture，因为 mState 在 Capture 中，如 mCaptureCallback 中所定义
private void capturePicture() {
mTakePictureRunnable = new Runnable() {
@Override
public void run() {
takePictureNow();
}
};
mBackgroundHandler.post(mTakePictureRunnable);
}
定义了 takePicutreNow
private void takePictureNow() {
Log.d(TAG, "Running captureStillPicture");
try {
if (null == mCameraDevice) {
return;
}
// This is the CaptureRequest.Builder that we use to take a picture.
final CaptureRequest.Builder captureBuilder =
mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_STILL_CAPTURE);
captureBuilder.addTarget(mImageReader.getSurface());
SurfaceTexture texture = mTextureView.getSurfaceTexture();
assert texture != null;
texture.setDefaultBufferSize(mPreviewSize.getWidth(), mPreviewSize.getHeight());
Log.d(TAG, "here is the width of texture" + mPreviewSize.getWidth());
Log.d(TAG, "here is the height of texture" + mPreviewSize.getHeight());
Surface surface = new Surface(texture);
captureBuilder.addTarget(surface);
// Orientation
int rotation = getWindowManager().getDefaultDisplay().getRotation();
captureBuilder.set(CaptureRequest.JPEG_ORIENTATION, ORIENTATIONS.get(rotation));
//Location if needed
boolean Location_Saved = CameraSettings.Instance().getBoolean(CameraSettings.SAVE_LOCATION,
getResources().getBoolean(R.bool.action_camera_settings_dflt_location));
if(Location_Saved == true) {
captureBuilder.set(CaptureRequest.JPEG_GPS_LOCATION, mLocationManager.getCurrentLocation());
} else {
captureBuilder.set(CaptureRequest.JPEG_GPS_LOCATION, null);
}
CameraCaptureSession.CaptureCallback CaptureCallback
= new CameraCaptureSession.CaptureCallback() {
@Override
public void onCaptureStarted(@NonNull CameraCaptureSession session,
@NonNull CaptureRequest request,
@NonNull long timestamp,
@NonNull long framenumber) {
playShutterSound();
showShutterAnimation();
}
@Override
public void onCaptureCompleted(@NonNull CameraCaptureSession session,
@NonNull CaptureRequest request,
@NonNull TotalCaptureResult result) {
Log.d(TAG, mFile.toString());
mState = STATE_PREVIEW;
}
};
mCaptureSession.capture(captureBuilder.build(), CaptureCallback, null);
mCaptureSession.stopRepeating();
} catch (CameraAccessException e) {
e.printStackTrace();
}
}
这个过程是有效的，但我在印刷机和图像保存之间有一个滞后，如果我快速移动，我在预览屏幕上看到的最新图片与保存的图片不完全相同。
似乎捕获不更新表面，表面仅在我们处于预览时显示
知道我保存了什么吗？谢谢