Java Code Examples for android.hardware.Camera.Parameters#setFocusAreas()

public static void configureFocusArea(@NonNull final Parameters parameters,
        @NonNull final Rect area, final int width, final int height, final int orientation) {
    final List<Area> areas = new ArrayList<>(1);
    final Rect rotatedArea =
            area.rotate(-orientation, width / 2f, height / 2f).bound(0, 0, width, height);
    areas.add(new Area(new android.graphics.Rect(mapCoordinate(rotatedArea.getLeft(), width),
            mapCoordinate(rotatedArea.getTop(), height),
            mapCoordinate(rotatedArea.getRight(), width),
            mapCoordinate(rotatedArea.getBottom(), height)), 1000));
    if (parameters.getMaxNumFocusAreas() > 0) {
        parameters.setFocusAreas(areas);
    }
    if (parameters.getMaxNumMeteringAreas() > 0) {
        parameters.setMeteringAreas(areas);
    }
}
 

public void focusOnPoint(int x, int y, int width, int height) {
    Log.v(TAG, "touch point (" + x + ", " + y + ")");
    if (mCamera == null) {
        return;
    }
    Parameters parameters = mCamera.getParameters();
    // 1.先要判断是否支持设置聚焦区域
    if (parameters.getMaxNumFocusAreas() > 0) {
        // 2.以触摸点为中心点，view窄边的1/4为聚焦区域的默认边长
        int length = Math.min(width, height) >> 3; // 1/8的长度
        int left = x - length;
        int top = y - length;
        int right = x + length;
        int bottom = y + length;
        // 3.映射，因为相机聚焦的区域是一个(-1000,-1000)到(1000,1000)的坐标区域
        left = left * 2000 / width - 1000;
        top = top * 2000 / height - 1000;
        right = right * 2000 / width - 1000;
        bottom = bottom * 2000 / height - 1000;
        // 4.判断上述矩形区域是否超过边界，若超过则设置为临界值
        left = left < -1000 ? -1000 : left;
        top = top < -1000 ? -1000 : top;
        right = right > 1000 ? 1000 : right;
        bottom = bottom > 1000 ? 1000 : bottom;
        Log.d(TAG, "focus area (" + left + ", " + top + ", " + right + ", " + bottom + ")");
        ArrayList<Camera.Area> areas = new ArrayList<>();
        areas.add(new Camera.Area(new Rect(left, top, right, bottom), 600));
        parameters.setFocusAreas(areas);
    }
    try {
        mCamera.cancelAutoFocus(); // 先要取消掉进程中所有的聚焦功能
        mCamera.setParameters(parameters);
        mCamera.autoFocus(this); // 调用聚焦
    } catch (Exception e) {
        e.printStackTrace();
    }
}
 

/**
 * 手动聚焦
 *  @param point 触屏坐标
 */
protected void onFocus(Point point,AutoFocusCallback callback){
	Parameters parameters=mCamera.getParameters();
	//不支持设置自定义聚焦，则使用自动聚焦，返回
	if (parameters.getMaxNumFocusAreas()<=0) {
		mCamera.autoFocus(callback);
		return;
	}
	List<Area> areas=new ArrayList<Area>();
	int left=point.x-300;
	int top=point.y-300;
	int right=point.x+300;
	int bottom=point.y+300;
	left=left<-1000?-1000:left;
	top=top<-1000?-1000:top;
	right=right>1000?1000:right;
	bottom=bottom>1000?1000:bottom;
	areas.add(new Area(new Rect(left,top,right,bottom), 100));
	parameters.setFocusAreas(areas);
	try {
		//本人使用的小米手机在设置聚焦区域的时候经常会出异常，看日志发现是框架层的字符串转int的时候出错了，
		//目测是小米修改了框架层代码导致，在此try掉，对实际聚焦效果没影响
		mCamera.setParameters(parameters);
	} catch (Exception e) {
		// TODO: handle exception
		e.printStackTrace();
	}
	mCamera.autoFocus(callback);
}
 

private void applySettingsToParameters(final CameraSettings settings,
        final Parameters parameters) {
    final CameraCapabilities.Stringifier stringifier = mCapabilities.getStringifier();
    Size photoSize = settings.getCurrentPhotoSize();
    parameters.setPictureSize(photoSize.width(), photoSize.height());
    Size previewSize = settings.getCurrentPreviewSize();
    parameters.setPreviewSize(previewSize.width(), previewSize.height());
    if (settings.getPreviewFrameRate() == -1) {
        parameters.setPreviewFpsRange(settings.getPreviewFpsRangeMin(),
                settings.getPreviewFpsRangeMax());
    } else {
        parameters.setPreviewFrameRate(settings.getPreviewFrameRate());
    }
    parameters.setPreviewFormat(settings.getCurrentPreviewFormat());
    parameters.setJpegQuality(settings.getPhotoJpegCompressionQuality());
    if (mCapabilities.supports(CameraCapabilities.Feature.ZOOM)) {
        parameters.setZoom(zoomRatioToIndex(settings.getCurrentZoomRatio(),
                parameters.getZoomRatios()));
    }
    parameters.setExposureCompensation(settings.getExposureCompensationIndex());
    if (mCapabilities.supports(CameraCapabilities.Feature.AUTO_EXPOSURE_LOCK)) {
        parameters.setAutoExposureLock(settings.isAutoExposureLocked());
    }
    parameters.setFocusMode(stringifier.stringify(settings.getCurrentFocusMode()));
    if (mCapabilities.supports(CameraCapabilities.Feature.AUTO_WHITE_BALANCE_LOCK)) {
        parameters.setAutoWhiteBalanceLock(settings.isAutoWhiteBalanceLocked());
    }
    if (settings.getWhiteBalance() != null) {
        parameters.setWhiteBalance(stringifier.stringify(settings.getWhiteBalance()));
    }
    if (mCapabilities.supports(CameraCapabilities.Feature.FOCUS_AREA)) {
        if (settings.getFocusAreas().size() != 0) {
            parameters.setFocusAreas(settings.getFocusAreas());
        } else {
            parameters.setFocusAreas(null);
        }
    }
    if (mCapabilities.supports(CameraCapabilities.Feature.METERING_AREA)) {
        if (settings.getMeteringAreas().size() != 0) {
            parameters.setMeteringAreas(settings.getMeteringAreas());
        } else {
            parameters.setMeteringAreas(null);
        }
    }
    if (settings.getCurrentFlashMode() != CameraCapabilities.FlashMode.NO_FLASH) {
        parameters.setFlashMode(stringifier.stringify(settings.getCurrentFlashMode()));
    }
    if (settings.getCurrentSceneMode() != CameraCapabilities.SceneMode.NO_SCENE_MODE) {
        if (settings.getCurrentSceneMode() != null) {
            parameters
                    .setSceneMode(stringifier.stringify(settings.getCurrentSceneMode()));
        }
    }
    parameters.setRecordingHint(settings.isRecordingHintEnabled());
    Size jpegThumbSize = settings.getExifThumbnailSize();
    if (jpegThumbSize != null) {
        parameters.setJpegThumbnailSize(jpegThumbSize.width(), jpegThumbSize.height());
    }
    parameters.setPictureFormat(settings.getCurrentPhotoFormat());

    CameraSettings.GpsData gpsData = settings.getGpsData();
    if (gpsData == null) {
        parameters.removeGpsData();
    } else {
        parameters.setGpsTimestamp(gpsData.timeStamp);
        if (gpsData.processingMethod != null) {
            // It's a hack since we always use GPS time stamp but does
            // not use other fields sometimes. Setting processing
            // method to null means the other fields should not be used.
            parameters.setGpsAltitude(gpsData.altitude);
            parameters.setGpsLatitude(gpsData.latitude);
            parameters.setGpsLongitude(gpsData.longitude);
            parameters.setGpsProcessingMethod(gpsData.processingMethod);
        }
    }

}