/*
* 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.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.
*
*/
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);
//FIXME
// 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 + height);
Log.d(TAG, "Calculated framing rect: " + framingRect);
}
return framingRect;
}
/**
* Like {@link #getFramin
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生成和扫描二维码demo
共85个文件
class:38个
java:20个
png:7个
4星 · 超过85%的资源 需积分: 10 237 下载量 129 浏览量
2015-01-20
17:03:24
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收藏 899KB RAR 举报
温馨提示
二维码在开发中是非常常用的,本例子写的很明了,包分的很清楚,用的时候只要改变BarCodeTestActivity中的相关代码,其他的包直接复制就行了
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收起资源包目录
生成和扫描二维码.rar (85个子文件)
生成和扫描二维码
BarCodeTest
.project 814B
bin
AndroidManifest.xml 1KB
jarlist.cache 120B
dexedLibs
zxing-b7689895754194e91dddeb952816ffa2.jar 140KB
BarCodeTest.apk 191KB
res
crunch
drawable-ldpi
ic_launcher.png 2KB
drawable-hdpi
ic_launcher.png 4KB
drawable-mdpi
ic_launcher.png 2KB
resources.ap_ 29KB
classes
com
ericssonlabs
R$string.class 421B
BarCodeTestActivity$2.class 2KB
R$layout.class 418B
BarCodeTestActivity$1.class 1KB
R$drawable.class 431B
BarCodeTestActivity.class 2KB
R.class 605B
R$color.class 1KB
BuildConfig.class 341B
R$raw.class 419B
R$attr.class 334B
R$id.class 1KB
zxing
encoding
EncodingHandler.class 2KB
camera
PreviewCallback.class 2KB
CameraConfigurationManager.class 7KB
CameraManager.class 6KB
AutoFocusCallback.class 2KB
FlashlightManager.class 4KB
PlanarYUVLuminanceSource.class 3KB
view
ViewfinderView.class 4KB
ViewfinderResultPointCallback.class 768B
activity
CaptureActivity.class 7KB
CaptureActivity$2.class 792B
CaptureActivity$1.class 838B
decoding
FinishListener.class 1KB
CaptureActivityHandler.class 4KB
Intents$WifiConnect.class 583B
DecodeThread.class 3KB
Intents$SearchBookContents.class 583B
Intents.class 619B
DecodeFormatManager.class 4KB
DecodeHandler.class 4KB
InactivityTimer$DaemonThreadFactory.class 907B
InactivityTimer.class 2KB
CaptureActivityHandler$State.class 1KB
Intents$Share.class 476B
Intents$Scan.class 849B
Intents$Encode.class 604B
classes.dex 430KB
proguard.cfg 1KB
.settings
org.eclipse.jdt.core.prefs 177B
AndroidManifest.xml 1KB
libs
zxing.jar 323KB
src
com
ericssonlabs
BarCodeTestActivity.java 3KB
zxing
encoding
EncodingHandler.java 1KB
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
activity
CaptureActivity.java 6KB
decoding
DecodeFormatManager.java 4KB
CaptureActivityHandler.java 5KB
FinishListener.java 1KB
DecodeThread.java 2KB
DecodeHandler.java 4KB
Intents.java 6KB
InactivityTimer.java 2KB
project.properties 361B
res
values
colors.xml 1KB
strings.xml 160B
ids.xml 1KB
layout
camera.xml 2KB
main.xml 2KB
raw
beep.ogg 12KB
realm_properties 49B
drawable-ldpi
ic_launcher.png 2KB
drawable-hdpi
ic_launcher.png 4KB
drawable-mdpi
ic_launcher.png 3KB
navbar.9.png 3KB
drawable-xhdpi
.classpath 528B
gen
com
ericssonlabs
R.java 4KB
BuildConfig.java 158B
assets
共 85 条
- 1
资源评论
- surwe2017-12-09不知道情况如何
- halftoall2016-07-26看了一下,还可以,打算以后用
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