/*
* 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.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;
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 dswitkin@google.com (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 + height);
Log.d(TAG, "Calculated framing rect: " + framingRect);
}
return framingRect;
}
/**
* Like {@link #getFramingRect} but coordinates are in terms of the preview
* frame
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ZXingDemo.rar (67个子文件)
ZXingDemo
AndroidManifest.xml 1KB
res
layout
main.xml 1KB
raw
beep.ogg 6KB
drawable-ldpi
icon.png 2KB
drawable-mdpi
icon.png 3KB
drawable-hdpi
icon.png 4KB
values
strings.xml 185B
colors.xml 2KB
ids.xml 1KB
proguard.cfg 1KB
src
com
zijunlin
Zxing
Demo
view
ViewfinderResultPointCallback.java 1KB
ViewfinderView.java 6KB
decoding
CaptureActivityHandler.java 4KB
FinishListener.java 1KB
DecodeThread.java 3KB
InactivityTimer.java 2KB
Intents.java 6KB
DecodeFormatManager.java 3KB
DecodeHandler.java 3KB
CaptureActivity.java 5KB
camera
CameraManager.java 11KB
PreviewCallback.java 2KB
CameraConfigurationManager.java 9KB
PlanarYUVLuminanceSource.java 4KB
FlashlightManager.java 5KB
AutoFocusCallback.java 2KB
bin
ZXingDemo.apk 183KB
com
zijunlin
Zxing
Demo
view
ViewfinderResultPointCallback.class 838B
ViewfinderView.class 5KB
decoding
Intents$SearchBookContents.class 625B
DecodeFormatManager.class 4KB
Intents.class 717B
InactivityTimer$DaemonThreadFactory.class 963B
CaptureActivityHandler$State.class 1KB
InactivityTimer.class 2KB
Intents$WifiConnect.class 625B
Intents$Scan.class 891B
FinishListener.class 1KB
Intents$Share.class 518B
DecodeThread.class 2KB
Intents$Encode.class 646B
DecodeHandler.class 4KB
CaptureActivityHandler.class 4KB
R$color.class 1KB
CaptureActivity$1.class 863B
R.class 668B
R$layout.class 409B
R$attr.class 355B
CaptureActivity$2.class 1KB
CaptureActivity.class 7KB
R$id.class 983B
R$string.class 442B
R$drawable.class 415B
camera
PlanarYUVLuminanceSource.class 3KB
AutoFocusCallback.class 2KB
CameraConfigurationManager.class 7KB
CameraManager.class 6KB
PreviewCallback.class 2KB
FlashlightManager.class 4KB
R$raw.class 400B
classes.dex 345KB
resources.ap_ 20KB
.classpath 361B
assets
default.properties 362B
.settings
org.eclipse.jdt.core.prefs 208B
.project 845B
gen
com
zijunlin
Zxing
Demo
R.java 3KB
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