我是
Android Camera2 API的新手.
我只是将我的所有项目移动到新的Camera2 API.我用
Camera2Basic example作为起点.
我现在尝试通过添加这个来处理缩放：
public boolean onTouchEvent(MotionEvent event) {
try {
CameraManager manager = (CameraManager) getSystemService(Context.CAMERA_SERVICE);
CameraCharacteristics characteristics = manager.getCameraCharacteristics(mCameraId);
float maxZoom = (characteristics.get(CameraCharacteristics.SCALER_AVAILABLE_MAX_DIGITAL_ZOOM))*10;
Rect m = characteristics.get(CameraCharacteristics.SENSOR_INFO_ACTIVE_ARRAY_SIZE);
int action = event.getAction();
float current_finger_spacing;
if (event.getPointerCount() > 1) {
// Multi touch logic
current_finger_spacing = getFingerSpacing(event);
if(finger_spacing != 0){
if(current_finger_spacing > finger_spacing && maxZoom > zoom_level){
zoom_level++;
}
else if (current_finger_spacing < finger_spacing && zoom_level > 1){
zoom_level--;
}
int minW = (int) (m.width() / maxZoom);
int minH = (int) (m.height() / maxZoom);
int difW = m.width() - minW;
int difH = m.height() - minH;
int cropW = difW /100 *(int)zoom_level;
int cropH = difH /100 *(int)zoom_level;
cropW -= cropW & 3;
cropH -= cropH & 3;
Rect zoom = new Rect(cropW, cropH, m.width() - cropW, m.height() - cropH);
mPreviewRequestBuilder.set(CaptureRequest.SCALER_CROP_REGION, zoom);
}
finger_spacing = current_finger_spacing;
}
else{
if (action == MotionEvent.ACTION_UP) {
//single touch logic
}
}
try {
mCaptureSession.setRepeatingRequest(mPreviewRequestBuilder.build(), mCaptureCallback,
null);
}
catch (CameraAccessException e) {
e.printStackTrace();
}
catch (NullPointerException ex)
{
ex.printStackTrace();
}
}
catch (CameraAccessException e)
{
throw new RuntimeException("can not access camera.", e);
}
return true;
}
还有这个：
private float getFingerSpacing(MotionEvent event) {
float x = event.getX(0) - event.getX(1);
float y = event.getY(0) - event.getY(1);
return FloatMath.sqrt(x * x + y * y);
}
但是在我拍摄之后,图片结果没有变焦.
我怎样才能实现呢？
谢谢大家.
更新
需要添加captureBuilder.set(CaptureRequest.SCALER_CROP_REGION,zoom); captureStillPicture()方法.