无需触摸交互的对焦相机

Question

是否可以在Android相机应用程序中设置对焦区域，而无需任何触摸交互，而是通过通过网络接收的坐标？

更新：到目前为止，我尝试了以下代码片段：

public void doFocus(final Rect focusRect) {
try {
if (camera != null) {
List<Area> focusList = new ArrayList<Area>();
Area focusArea = new Area(focusRect, 1000);
focusList.add(focusArea);
Parameters param = camera.getParameters();
//param.setFocusMode(Parameters.FOCUS_MODE_AUTO);
Log.d(TAG, param.getMaxNumFocusAreas() + ";" + param.getMaxNumMeteringAreas() + " >> " + focusRect.toString());
param.setFocusAreas(focusList);
param.setMeteringAreas(focusList);
camera.setParameters(param);
camera.autoFocus(autoFocusCallback);
}
} catch (Exception e) {
e.printStackTrace();
Log.i(TAG, "Unable to autofocus");
}
}

此处调用此方法：

// Fixation of focus with touch
public void setCoordinates() {
float x = new MainActivity().coordinates().get(0);
float y = 1490f - (new MainActivity().coordinates().get(1));         //previewHeight minus input to get y coord in Android
Rect rect = new Rect(
(int) (x - 100),
(int) (y - 100),
(int) (x + 100),
(int) (y + 100));

final Rect targetFocusRect = new Rect(
rect.left * 2000 / previewWidth - 1000,
rect.top * 2000 / previewHeight - 1000,
rect.right * 2000 / previewWidth - 1000,
rect.bottom * 2000 / previewHeight - 1000);
out.println("FINAL RECT:" + targetFocusRect);
cameraPreview.doFocus(targetFocusRect);
}

此代码适用于触摸输入，但由于我修改了它并仅放置了特定坐标，因此不会设置焦点。

Answer 1

您可能希望自动对焦(不是手动(，但在以编程方式设置的区域中，无需用户输入。这是可能的：

Parameters parameters = camera.getParameters();
parameters.setFocusMode(Parameters.FOCUS_MODE_AUTO);
parameters.setFocusAreas(Lists.newArrayList(new Camera.Area(focusRect, 1000)));
camera.setParameters(parameters);
camera.autoFocus(this);

对于网络部分，您将在线找到足够的资源:)