/*
* 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.zijunlin.Zxing.Demo.camera;
import android.content.Context;
import android.content.SharedPreferences;
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.preference.PreferenceManager;
import android.util.Log;
import android.view.SurfaceHolder;
import java.io.IOException;
/**
* 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 [email protected] (Daniel Switkin)
*/
public final class CameraManager {
private static final String TAG = CameraManager.class.getSimpleName();
private static final int MIN_FRAME_WIDTH = 240;
private static final int MIN_FRAME_HEIGHT = 240;
private static final int MAX_FRAME_WIDTH = 480;
private static final int MAX_FRAME_HEIGHT = 360;
private static CameraManager 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;
}
private final Context context;
private final CameraConfigurationManager configManager;
private Camera camera;
private Rect framingRect;
private Rect framingRectInPreview;
private boolean initialized;
private boolean previewing;
private final boolean useOneShotPreviewCallback;
/**
* Preview frames are delivered here, which we pass on to the registered handler. Make sure to
* clear the handler so it will only receive one message.
*/
private final PreviewCallback previewCallback;
/** Autofocus callbacks arrive here, and are dispatched to the Handler which requested them. */
private final AutoFocusCallback autoFocusCallback;
/**
* 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 (cameraManager == null) {
cameraManager = new CameraManager(context);
}
}
/**
* Gets the CameraManager singleton instance.
*
* @return A reference to the CameraManager singleton.
*/
public static CameraManager get() {
return cameraManager;
}
private CameraManager(Context context) {
this.context = context;
this.configManager = 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;
useOneShotPreviewCallback = Integer.parseInt(Build.VERSION.SDK) > 3; // 3 = Cupcake
previewCallback = new PreviewCallback(configManager, useOneShotPreviewCallback);
autoFocusCallback = 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 (!initialized) {
initialized = true;
configManager.initFromCameraParameters(camera);
}
configManager.setDesiredCameraParameters(camera);
// SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
//是否使用前灯
// if (prefs.getBoolean(PreferencesActivity.KEY_FRONT_LIGHT, false)) {
// FlashlightManager.enableFlashlight();
// }
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 && !previewing) {
camera.startPreview();
previewing = true;
}
}
/**
* Tells the camera to stop drawing preview frames.
*/
public void stopPreview() {
if (camera != null && previewing) {
if (!useOneShotPreviewCallback) {
camera.setPreviewCallback(null);
}
camera.stopPreview();
previewCallback.setHandler(null, 0);
autoFocusCallback.setHandler(null, 0);
previewing = 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 && previewing) {
previewCallback.setHandler(handler, message);
if (useOneShotPreviewCallback) {
camera.setOneShotPreviewCallback(previewCallback);
} else {
camera.setPreviewCallback(previewCallback);
}
}
}
/**
* 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 && previewing) {
autoFocusCallback.setHandler(handler, message);
//Log.d(TAG, "Requesting auto-focus callback");
camera.autoFocus(autoFocusCallback);
}
}
/**
* 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 = configManager.getScreenResolution();
if (framingRect == 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;
framingRect = new Rect(leftOffset, topOffset, leftOffset + width, topOffset + he
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Android应用源码之二维码扫描的实现.zip项目安卓应用源码下载
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Android应用源码之二维码扫描的实现.zip项目安卓应用源码下载Android应用源码之二维码扫描的实现.zip项目安卓应用源码下载 1.适合学生毕业设计研究参考 2.适合个人学习研究参考 3.适合公司开发项目技术参考
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Android应用源码之二维码扫描的实现.zip (78个子文件)
Android应用源码之二维码扫描的实现
Android应用源码之二维码扫描的实现
二维码扫描的实现
ZXingDemo
.project 845B
bin
AndroidManifest.xml 1KB
jarlist.cache 120B
res
drawable-ldpi
icon.png 2KB
drawable-hdpi
icon.png 4KB
drawable-mdpi
icon.png 2KB
crunch
drawable-ldpi
icon.png 2KB
drawable-hdpi
icon.png 4KB
drawable-mdpi
icon.png 2KB
ZXingDemo.apk 353KB
resources.ap_ 20KB
classes
com
zijunlin
Zxing
Demo
R$string.class 442B
R$layout.class 409B
camera
PreviewCallback.class 2KB
CameraConfigurationManager.class 7KB
CameraManager.class 6KB
AutoFocusCallback.class 2KB
FlashlightManager.class 4KB
PlanarYUVLuminanceSource.class 3KB
R$drawable.class 415B
view
ViewfinderView.class 4KB
ViewfinderResultPointCallback.class 838B
CaptureActivity.class 7KB
R.class 668B
R$color.class 1KB
BuildConfig.class 355B
R$raw.class 400B
CaptureActivity$1.class 863B
R$attr.class 355B
decoding
FinishListener.class 1KB
CaptureActivityHandler.class 4KB
Intents$WifiConnect.class 625B
DecodeThread.class 3KB
Intents$SearchBookContents.class 625B
Intents.class 717B
DecodeFormatManager.class 4KB
DecodeHandler.class 4KB
InactivityTimer$DaemonThreadFactory.class 963B
InactivityTimer.class 2KB
CaptureActivityHandler$State.class 1KB
Intents$Share.class 518B
Intents$Scan.class 891B
Intents$Encode.class 646B
R$id.class 953B
core.jar 239KB
classes.dex 281KB
proguard.cfg 1KB
.settings
org.eclipse.jdt.core.prefs 177B
AndroidManifest.xml 1KB
src
com
zijunlin
Zxing
Demo
camera
CameraManager.java 11KB
AutoFocusCallback.java 2KB
PlanarYUVLuminanceSource.java 4KB
CameraConfigurationManager.java 9KB
PreviewCallback.java 2KB
FlashlightManager.java 5KB
view
ViewfinderResultPointCallback.java 1KB
ViewfinderView.java 6KB
CaptureActivity.java 5KB
decoding
DecodeFormatManager.java 4KB
CaptureActivityHandler.java 4KB
FinishListener.java 1KB
DecodeThread.java 3KB
DecodeHandler.java 3KB
Intents.java 6KB
InactivityTimer.java 2KB
project.properties 361B
res
values
colors.xml 2KB
strings.xml 176B
ids.xml 1KB
layout
main.xml 1KB
raw
beep.ogg 6KB
drawable-ldpi
icon.png 2KB
drawable-hdpi
icon.png 4KB
drawable-mdpi
icon.png 3KB
.classpath 640B
lib
core.jar 239KB
gen
com
zijunlin
Zxing
Demo
R.java 3KB
BuildConfig.java 165B
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