package com.barcode.camera;
import android.annotation.SuppressLint;
import android.content.Context;
import android.content.SharedPreferences;
import android.graphics.Point;
import android.hardware.Camera;
import android.preference.PreferenceManager;
import android.util.Log;
import android.view.Display;
import android.view.WindowManager;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
/**
* 相机配置管理类
*
*/
final class CameraConfigurationManager {
private static final String TAG = "CameraConfiguration";
// This is bigger than the size of a small screen, which is still supported.
// The routine
// below will still select the default (presumably 320x240) size for these.
// This prevents
// accidental selection of very low resolution on some devices.
private static final int MIN_PREVIEW_PIXELS = 480 * 320; // normal screen
private static final int MAX_PREVIEW_PIXELS = 1280 * 720;
private final Context context;
private Point screenResolution;
private Point cameraResolution;
CameraConfigurationManager(Context context) {
this.context = context;
}
/**
* Reads, one time, values from the camera that are needed by the app.
*/
void initFromCameraParameters(Camera camera) {
Camera.Parameters parameters = camera.getParameters();
WindowManager manager = (WindowManager) context
.getSystemService(Context.WINDOW_SERVICE);
Display display = manager.getDefaultDisplay();
@SuppressWarnings("deprecation")
int width = display.getWidth();
@SuppressWarnings("deprecation")
int height = display.getHeight();
screenResolution = new Point(width, height);
Log.i(TAG, "Screen resolution: " + screenResolution);
cameraResolution = findBestPreviewSizeValue(parameters,
screenResolution);
// 解决竖屏拉伸
Point screenResolutionForCamera = new Point();
screenResolutionForCamera.x = screenResolution.x;
screenResolutionForCamera.y = screenResolution.y;
if (screenResolution.x < screenResolution.y) {
screenResolutionForCamera.x = screenResolution.y;
screenResolutionForCamera.y = screenResolution.x;
}
Log.i(TAG, "Camera resolution: " + cameraResolution);
}
@SuppressLint("NewApi")
void setDesiredCameraParameters(Camera camera, boolean safeMode) {
camera.setDisplayOrientation(90);
Camera.Parameters parameters = camera.getParameters();
if (parameters == null) {
Log.w(TAG,
"Device error: no camera parameters are available. Proceeding without configuration.");
return;
}
Log.i(TAG, "Initial camera parameters: " + parameters.flatten());
if (safeMode) {
Log.w(TAG,
"In camera config safe mode -- most settings will not be honored");
}
SharedPreferences prefs = PreferenceManager
.getDefaultSharedPreferences(context);
initializeTorch(parameters, prefs, safeMode);
String focusMode = null;
if (true) {
if (safeMode || false) {
focusMode = findSettableValue(
parameters.getSupportedFocusModes(),
Camera.Parameters.FOCUS_MODE_AUTO);
} else {
focusMode = findSettableValue(
parameters.getSupportedFocusModes(),
"continuous-picture", // Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE
// in 4.0+
"continuous-video", // Camera.Parameters.FOCUS_MODE_CONTINUOUS_VIDEO
// in 4.0+
Camera.Parameters.FOCUS_MODE_AUTO);
}
}
// Maybe selected auto-focus but not available, so fall through here:
if (!safeMode && focusMode == null) {
focusMode = findSettableValue(parameters.getSupportedFocusModes(),
Camera.Parameters.FOCUS_MODE_MACRO, "edof"); // Camera.Parameters.FOCUS_MODE_EDOF
// in 2.2+
}
if (focusMode != null) {
parameters.setFocusMode(focusMode);
}
parameters.setPreviewSize(cameraResolution.x, cameraResolution.y);
camera.setParameters(parameters);
}
Point getCameraResolution() {
return cameraResolution;
}
Point getScreenResolution() {
return screenResolution;
}
void setTorch(Camera camera, boolean newSetting) {
Camera.Parameters parameters = camera.getParameters();
doSetTorch(parameters, newSetting, false);
camera.setParameters(parameters);
boolean currentSetting = false;
if (currentSetting != newSetting) {
// SharedPreferences.Editor editor = prefs.edit();
// editor.putBoolean(PreferencesActivity.KEY_FRONT_LIGHT,
// newSetting);
// editor.commit();
}
}
private void initializeTorch(Camera.Parameters parameters,
SharedPreferences prefs, boolean safeMode) {
boolean currentSetting = false;
doSetTorch(parameters, currentSetting, safeMode);
}
private void doSetTorch(Camera.Parameters parameters, boolean newSetting,
boolean safeMode) {
String flashMode;
if (newSetting) {
flashMode = findSettableValue(parameters.getSupportedFlashModes(),
Camera.Parameters.FLASH_MODE_TORCH,
Camera.Parameters.FLASH_MODE_ON);
} else {
flashMode = findSettableValue(parameters.getSupportedFlashModes(),
Camera.Parameters.FLASH_MODE_OFF);
}
if (flashMode != null) {
parameters.setFlashMode(flashMode);
}
}
private Point findBestPreviewSizeValue(Camera.Parameters parameters,
Point screenResolution) {
List<Camera.Size> rawSupportedSizes = parameters
.getSupportedPreviewSizes();
if (rawSupportedSizes == null) {
Log.w(TAG,
"Device returned no supported preview sizes; using default");
Camera.Size defaultSize = parameters.getPreviewSize();
return new Point(defaultSize.width, defaultSize.height);
}
// Sort by size, descending
List<Camera.Size> supportedPreviewSizes = new ArrayList<Camera.Size>(
rawSupportedSizes);
Collections.sort(supportedPreviewSizes, new Comparator<Camera.Size>() {
@Override
public int compare(Camera.Size a, Camera.Size b) {
int aPixels = a.height * a.width;
int bPixels = b.height * b.width;
if (bPixels < aPixels) {
return -1;
}
if (bPixels > aPixels) {
return 1;
}
return 0;
}
});
if (Log.isLoggable(TAG, Log.INFO)) {
StringBuilder previewSizesString = new StringBuilder();
for (Camera.Size supportedPreviewSize : supportedPreviewSizes) {
previewSizesString.append(supportedPreviewSize.width)
.append('x').append(supportedPreviewSize.height)
.append(' ');
}
Log.i(TAG, "Supported preview sizes: " + previewSizesString);
}
Point bestSize = null;
float screenAspectRatio = (float) screenResolution.x
/ (float) screenResolution.y;
float diff = Float.POSITIVE_INFINITY;
for (Camera.Size supportedPreviewSize : supportedPreviewSizes) {
int realWidth = supportedPreviewSize.width;
int realHeight = supportedPreviewSize.height;
int pixels = realWidth * realHeight;
if (pixels < MIN_PREVIEW_PIXELS || pixels > MAX_PREVIEW_PIXELS) {
continue;
}
boolean isCandidatePortrait = realWidth < realHeight;
int maybeFlippedWidth = isCandidatePortrait ? realHeight
: realWidth;
int maybeFlippedHeight = isCandidatePortrait ? realWidth
: realHeight;
if (maybeFlippedWidth == screenResolution.x
&& maybeFlippedHeight == screenResolution.y) {
Point exactPoint = new Point(realWidth, realHeight);
Log.i(TAG, "Found preview size exactly matching screen size: "
+ exactPoint);
return exactPoint;
}
float aspectRatio = (float) maybeFlippedWidth
/ (float) maybeFlippedHeight;
float newDiff = Math.abs(aspectRatio - screenAspectRatio);
if (newDiff < diff) {
bestSize = new Point(realWidth, realHeight);
diff = newDiff;
}
}
if (bestSize == null) {
Camera.Size defaultSize = parameters.getPreviewSize();
bestSize = new Point(defaultSize.width, defaultSize.height);
Log.i(TAG, "No suitable preview sizes, using default: " + bestSize);
}
Log.i(TAG, "Found best approximate preview size: " + bestSize);
return bestSize;
}
private static String findSettableValue(Collection<String> supportedValues,
String... desiredValues) {
Log.i(TAG, "Supported values: " + supportedValues);
String result = null;
if (supportedValues != null) {
for (String desiredValue : desiredValues) {
if (supportedValues.contains(desiredValue)) {
result = desiredValue;
break;
}
}
}
Log.i(TAG, "Settable value: " + result);
return result;
}
}