/*
* 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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BarCodeTest.zip (79个子文件)
BarCodeTest
.project 814B
project.properties 361B
proguard.cfg 1KB
src
com
zxing
view
ViewfinderView.java 6KB
ViewfinderResultPointCallback.java 1KB
encoding
EncodingHandler.java 1KB
camera
FlashlightManager.java 5KB
PreviewCallback.java 2KB
AutoFocusCallback.java 2KB
CameraConfigurationManager.java 9KB
CameraManager.java 11KB
PlanarYUVLuminanceSource.java 4KB
activity
CaptureActivity.java 6KB
decoding
FinishListener.java 1KB
DecodeHandler.java 4KB
InactivityTimer.java 2KB
DecodeFormatManager.java 4KB
Intents.java 6KB
DecodeThread.java 2KB
CaptureActivityHandler.java 5KB
ericssonlabs
BarCodeTestActivity.java 3KB
AndroidManifest.xml 1KB
res
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
layout
camera.xml 2KB
main.xml 2KB
values
colors.xml 1KB
ids.xml 1KB
strings.xml 182B
assets
gen
com
ericssonlabs
R.java 4KB
libs
zxing.jar 323KB
.classpath 408B
bin
resources.ap_ 29KB
classes
com
zxing
view
ViewfinderView.class 4KB
ViewfinderResultPointCallback.class 768B
encoding
EncodingHandler.class 2KB
camera
PreviewCallback.class 2KB
CameraManager.class 6KB
FlashlightManager.class 4KB
PlanarYUVLuminanceSource.class 3KB
AutoFocusCallback.class 2KB
CameraConfigurationManager.class 7KB
activity
CaptureActivity$1.class 838B
CaptureActivity$2.class 792B
CaptureActivity.class 7KB
decoding
FinishListener.class 1KB
Intents$Share.class 476B
Intents$SearchBookContents.class 583B
Intents$WifiConnect.class 583B
CaptureActivityHandler$State.class 1KB
DecodeThread.class 3KB
DecodeHandler.class 4KB
Intents$Scan.class 849B
InactivityTimer$DaemonThreadFactory.class 907B
DecodeFormatManager.class 4KB
CaptureActivityHandler.class 4KB
InactivityTimer.class 2KB
Intents.class 619B
Intents$Encode.class 604B
ericssonlabs
R$layout.class 418B
BarCodeTestActivity$1.class 1KB
R$drawable.class 431B
R$attr.class 334B
R$raw.class 419B
BarCodeTestActivity.class 2KB
R$id.class 1KB
R.class 605B
R$string.class 421B
R$color.class 1KB
BarCodeTestActivity$2.class 2KB
res
drawable-ldpi
ic_launcher.png 2KB
drawable-hdpi
ic_launcher.png 4KB
drawable-mdpi
ic_launcher.png 2KB
classes.dex 340KB
BarCodeTest.apk 190KB
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- 康仔20122013-10-24这个很有帮助
- xixihaha200820132014-05-06还好 可以用上
- HeartRunner2015-11-03资源还不错,就是代码注释不够详尽
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