基于二维码的wifi账号密码共享demo

/* * Copyright (C) 2008 ZXing authors * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.uperone.zxing.camera; import java.io.IOException; import android.content.Context; import android.graphics.PixelFormat; import android.graphics.Point; import android.graphics.Rect; import android.hardware.Camera; import android.os.Build; import android.os.Handler; import android.util.Log; import android.view.SurfaceHolder; /** * This object wraps the Camera service object and expects to be the only one * talking to it. The implementation encapsulates the steps needed to take * preview-sized images, which are used for both preview and decoding. * * @author dswitkin@google.com (Daniel Switkin) */ @SuppressWarnings("deprecation") public final class CameraManager { static final int SDK_INT; // Later we can use Build.VERSION.SDK_INT static { int sdkInt; try { sdkInt = Integer.parseInt(Build.VERSION.SDK); } catch (NumberFormatException nfe) { // Just to be safe sdkInt = 10000; } SDK_INT = sdkInt; } /** * Initializes this static object with the Context of the calling Activity. * * @param context * The Activity which wants to use the camera. */ public static void init(Context context) { if (mCameraManager == null) { mCameraManager = new CameraManager(context); } } /** * Gets the CameraManager singleton instance. * * @return A reference to the CameraManager singleton. */ public static CameraManager get() { return mCameraManager; } private CameraManager(Context context) { mConfigManager = new CameraConfigurationManager(context); // Camera.setOneShotPreviewCallback() has a race condition in Cupcake, // so we use the older // Camera.setPreviewCallback() on 1.5 and earlier. For Donut and later, // we need to use // the more efficient one shot callback, as the older one can swamp the // system and cause it // to run out of memory. We can't use SDK_INT because it was introduced // in the Donut SDK. // useOneShotPreviewCallback = Integer.parseInt(Build.VERSION.SDK) > // Build.VERSION_CODES.CUPCAKE; mUseOneShotPreviewCallback = Integer.parseInt(Build.VERSION.SDK) > 3; mPreviewCallback = new PreviewCallback(mConfigManager, mUseOneShotPreviewCallback); mAutoFocusCallback = new AutoFocusCallback(); } /** * Opens the camera driver and initializes the hardware parameters. * * @param holder * The surface object which the camera will draw preview frames * into. * @throws IOException * Indicates the camera driver failed to open. */ public void openDriver(SurfaceHolder holder) throws IOException { if (camera == null) { camera = Camera.open(); if (camera == null) { throw new IOException(); } camera.setPreviewDisplay(holder); if (!mInitialized) { mInitialized = true; mConfigManager.initFromCameraParameters(camera); } mConfigManager.setDesiredCameraParameters(camera); FlashlightManager.enableFlashlight(); } } /** * Closes the camera driver if still in use. */ public void closeDriver() { if (camera != null) { FlashlightManager.disableFlashlight(); camera.release(); camera = null; } } /** * Asks the camera hardware to begin drawing preview frames to the screen. */ public void startPreview() { if (camera != null && !mPreviewing) { camera.startPreview(); mPreviewing = true; } } /** * Tells the camera to stop drawing preview frames. */ public void stopPreview() { if (camera != null && mPreviewing) { if (!mUseOneShotPreviewCallback) { camera.setPreviewCallback(null); } camera.stopPreview(); mPreviewCallback.setHandler(null, 0); mAutoFocusCallback.setHandler(null, 0); mPreviewing = false; } } /** * A single preview frame will be returned to the handler supplied. The data * will arrive as byte[] in the message.obj field, with width and height * encoded as message.arg1 and message.arg2, respectively. * * @param handler * The handler to send the message to. * @param message * The what field of the message to be sent. */ public void requestPreviewFrame(Handler handler, int message) { if (camera != null && mPreviewing) { mPreviewCallback.setHandler(handler, message); if (mUseOneShotPreviewCallback) { camera.setOneShotPreviewCallback(mPreviewCallback); } else { camera.setPreviewCallback(mPreviewCallback); } } } /** * Asks the camera hardware to perform an autofocus. * * @param handler * The Handler to notify when the autofocus completes. * @param message * The message to deliver. */ public void requestAutoFocus(Handler handler, int message) { if (camera != null && mPreviewing) { mAutoFocusCallback.setHandler(handler, message); // Log.d(TAG, "Requesting auto-focus callback"); camera.autoFocus(mAutoFocusCallback); } } /** * Calculates the framing rect which the UI should draw to show the user * where to place the barcode. This target helps with alignment as well as * forces the user to hold the device far enough away to ensure the image * will be in focus. * * @return The rectangle to draw on screen in window coordinates. */ public Rect getFramingRect() { Point screenResolution = mConfigManager.getScreenResolution(); if (mFramingRect == null) { if (camera == null) { return null; } int width = screenResolution.x * 3 / 4; if (width < MIN_FRAME_WIDTH) { width = MIN_FRAME_WIDTH; } else if (width > MAX_FRAME_WIDTH) { width = MAX_FRAME_WIDTH; } int height = screenResolution.y * 3 / 4; if (height < MIN_FRAME_HEIGHT) { height = MIN_FRAME_HEIGHT; } else if (height > MAX_FRAME_HEIGHT) { height = MAX_FRAME_HEIGHT; } int leftOffset = (screenResolution.x - width) / 2; int topOffset = (screenResolution.y - height) / 2; mFramingRect = new Rect(leftOffset, topOffset, leftOffset + width, topOffset + height); Log.d(TAG, "Calculated framing rect: " + mFramingRect); } return mFramingRect; } /** * Like {@link #getFramingRect} but coordinates are in terms of the preview * frame, not UI / screen. */ public Rect getFramingRectInPreview() { if (mFramingRectInPreview == null) { Rect rect = new Rect(getFramingRect()); Point cameraResolution = mConfigManager.getCameraResolution(); Point screenResolution = mConfigManager.getScreenResolution(); rect.left = rect.left * cameraResolution.x / screenResolution.x; rect.right = rect.right * cameraResolution.x / screenResolution.x; rect.top = rect.top * cameraResolution.y / screenResolution.y; rect.bottom = rect.bottom * cameraResolution.y / screenResolution.y; mFramingRectInPreview = rect; } return mFramingRectInPreview; } /** * Converts the result points from still resolution coordinates to screen * coordinates. * * @param points * The points returned by the Reader subclass through * Result.getResultPoints(). * @return An array of Points scaled to the size of the framing rect and * offset appropriately so they can be drawn in screen coordinates. */ /* * public Point[] convertResultPoints(ResultPoint[] points) { Rect frame = * getFramingRectInPreview(); int count = points.length; Point[] output = * new Point[count]; for (int x = 0; x < count; x++) { output[x] = new * Point(); output[x].x = frame