在Camera2应用编程接口中实现点击聚焦
我想在我的自定义相机中实现轻拍对焦功能。这是Google https://github.com/googlesamples/android-Camera2Basic提供的基本代码。
下面是代码片段，我认为我应该在其中添加我的功能，如果有人已经实现了Camera2应用程序接口，请帮助！
private void lockFocus() {
try {
// This is how to tell the camera to lock focus.
mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AF_TRIGGER,
CameraMetadata.CONTROL_AF_TRIGGER_START);
// Tell #mCaptureCallback to wait for the lock.
mState = STATE_WAITING_LOCK;
mCaptureSession.capture(mPreviewRequestBuilder.build(), mCaptureCallback,
mBackgroundHandler);
} catch (CameraAccessException e) {
e.printStackTrace();
}
}回答 3
Stack Overflow用户
发布于 2015-10-17 09:03:43
您需要将自动对焦和自动曝光区域设置为用户点击的区域。
密钥是CONTROL_AF_REGIONS和CONTROL_AE_REGIONS。
它们的单位在传感器active array coordinate system中，因此您必须将UI触摸坐标转换为相对于预览视图的坐标，并从那里转换为活动阵列坐标。
如果预览的纵横比与传感器的纵横比匹配，则很简单；如果不匹配，则必须调整裁剪以创建预览输出。关于裁剪如何工作的最佳图表是目前的here。请注意，如果您还在应用缩放，则需要在计算中也包括缩放因子。
一旦你计算了区域，你可能会想要将自动对焦模式设置为自动(而不是通常用于正常预览的CONTINUOUS_PICTURE )，然后触发自动对焦。一旦你收敛了自动对焦(看看捕捉结果中的自动对焦状态，等待AF_STATE_FOCUSED_LOCKED)，你就可以拍一张对焦的照片了。如果您想在一段时间后恢复正常操作，或者用户取消了对焦的触摸，请将AF模式切换回CONTINUOUS_PICTURE。
Stack Overflow用户
发布于 2017-02-14 16:45:23
- 使用onTouch listener来获取用户根据该位置触摸screen.
- Calculate a/MeteringRectangle(s)的位置。使用此计量矩形可将构建捕获请求设置为CaptureRequest.CONTROL_AE_REGION
- set to
- CaptureRequest.CONTROL_AF_TRIGGER to CameraMetadata.CONTROL_AF_TRIGGER_START
- CaptureRequest.CONTROL_AE_PRECAPTURE_TRIGGER to CameraMetadata.CONTROL_AE_TRIGGER_START
- Then
- CaptureRequest.CONTROL_AF_REGION CaptureRequest.CONTROL_AF_MODE
Here你可以找到一个完整的例子。
Stack Overflow用户
发布于 2019-01-02 15:57:29
public void handleFocus(MotionEvent event) {
int pointerId = event.getPointerId(0);
int pointerIndex = event.findPointerIndex(pointerId);
// Get the pointer's current position
float x = event.getX(pointerIndex);
float y = event.getY(pointerIndex);
Rect touchRect = new Rect(
(int) (x - 100),
(int) (y - 100),
(int) (x + 100),
(int) (y + 100) );
if (mCameraId == null) return;
CameraManager cm = (CameraManager)this.getSystemService(Context.CAMERA_SERVICE);
CameraCharacteristics cc = null;
try {
cc = cm.getCameraCharacteristics(mCameraId);
} catch (CameraAccessException e) {
e.printStackTrace();
}
MeteringRectangle focusArea = new MeteringRectangle(touchRect,MeteringRectangle.METERING_WEIGHT_DONT_CARE);
mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AF_TRIGGER, CameraMetadata.CONTROL_AF_TRIGGER_CANCEL);
try {
mCaptureSession.capture(mPreviewRequestBuilder.build(), mCaptureCallback,
mBackgroundHandler);
// After this, the camera will go back to the normal state of preview.
mState = STATE_PREVIEW;
} catch (CameraAccessException e){
// log
}
/* if (isMeteringAreaAESupported(cc)) {
*//*mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AE_REGIONS,
new MeteringRectangle[]{focusArea});*//*
}
if (isMeteringAreaAFSupported(cc)) {
*//*mPreviewRequestBuilder
.set(CaptureRequest.CONTROL_AF_REGIONS, new MeteringRectangle[]{focusArea});
mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AF_MODE,
CaptureRequest.CONTROL_AF_MODE_AUTO);*//*
}*/
mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AE_REGIONS,
new MeteringRectangle[]{focusArea});
mPreviewRequestBuilder
.set(CaptureRequest.CONTROL_AF_REGIONS, new MeteringRectangle[]{focusArea});
mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AF_MODE,
CaptureRequest.CONTROL_AF_MODE_CONTINUOUS_PICTURE);
mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AF_TRIGGER,
CameraMetadata.CONTROL_AF_TRIGGER_START);
mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AE_PRECAPTURE_TRIGGER,
CameraMetadata.CONTROL_AE_PRECAPTURE_TRIGGER_START);
try {
mCaptureSession.setRepeatingRequest(mPreviewRequestBuilder.build(), mCaptureCallback,
mBackgroundHandler);
/* mManualFocusEngaged = true;*/
} catch (CameraAccessException e) {
// error handling
}
}在averide on touch中调用触摸事件方法
https://stackoverflow.com/questions/33151244
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