我有一个使用camera2 Api的相机应用程序,我将onTouchListener实现到我用于从相机预览的TextureView,我想要的是当用户点击屏幕以便能够专注于该区域时,就像内置的Android相机一样。我不知道它出了什么问题,它在我使用AF_MODE_AUTO时有效,但它不精确,它只关注屏幕中心的什么。
这是我的代码:
mTextureView.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN:
Rect rect = cameraCharacteristics
.get(CameraCharacteristics.SENSOR_INFO_ACTIVE_ARRAY_SIZE);
Size size = cameraCharacteristics
.get(CameraCharacteristics.SENSOR_INFO_PIXEL_ARRAY_SIZE);
int areaSize = 200;
int right = rect.right;
int bottom = rect.bottom;
int viewWidth = mTextureView.getWidth();
int viewHeight = mTextureView.getHeight();
int ll,
rr;
Rect newRect;
int centerX = (int) event.getX();
int centerY = (int) event.getY();
ll = ((centerX * right) - areaSize) / viewWidth;
rr = ((centerY * bottom) - areaSize) / viewHeight;
int focusLeft = clamp(ll, 0, right);
int focusBottom = clamp(rr, 0, bottom);
newRect = new Rect(focusLeft, focusBottom, focusLeft
+ areaSize, focusBottom + areaSize);
MeteringRectangle meteringRectangle = new MeteringRectangle(
newRect, 500);
MeteringRectangle[] meteringRectangleArr = { meteringRectangle };
System.out.println("metering rectARR" + meteringRectangleArr);
mPreviewCaptureRequestBuilder.set(
CaptureRequest.CONTROL_AF_TRIGGER,
CameraMetadata.CONTROL_AF_TRIGGER_CANCEL);
mPreviewCaptureRequestBuilder.set(
CaptureRequest.CONTROL_AF_REGIONS,
meteringRectangleArr);
mPreviewCaptureRequestBuilder.set(
CaptureRequest.CONTROL_AF_TRIGGER,
CameraMetadata.CONTROL_AF_TRIGGER_START);
try {
mCameraCaptureSession.setRepeatingRequest(
mPreviewCaptureRequest,
mSessionCaptureCallback,
mBackgroundHandler);
} catch (CameraAccessException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
break;
}
return true;
}
});
}
答案 0 :(得分:0)
我将google's Camera2Basic example分支并将其更改为使用CaptureRequest.CONTROL_AF_MODE_AUTO
而不是CaptureRequest.CONTROL_AF_MODE_CONTINUOUS_PICTURE
您可以从git中获取项目并对其进行测试 - https://github.com/pinhassi/android-Camera2Basic
答案 1 :(得分:0)
您需要在CaptureRequest.Builder上设置CONTROL_AF_TRIGGER_CANCEL后调用CaptureSession.capture(mPreviewCaptureRequestBuilder.build(),mCallback,mHandler)
mPreviewCaptureRequestBuilder.set(
CaptureRequest.CONTROL_AF_TRIGGER,
CameraMetadata.CONTROL_AF_TRIGGER_CANCEL);
//TODO call capture
//TODO set new focus region
//TODO call capture/setRepeatingRequest