越来越多的手机具备自动对焦的拍摄功能,这也意味着这些手机可以具备条码扫描的功能.......手机具备条码扫描的功能,可以优化购物流程,快速存储电子名片(二维码)等
。
本文使用ZXing 1.6实现条码/二维码识别。
ZXing
是个很经典的条码/二维码识别的开源类库,long long ago,就有开发者在J2ME上使用ZXing了,不过要支持JSR-234规范(自动对焦)的手机才能发挥其威力,而目前已经有不少Android手机具备自动对焦的功能。
本文代码运行的结果如下,使用91手机助手截图时,无法截取SurfaceView的实时图像:
本文使用了ZXing1.6的core,即把\zxing-1.6\core\下的src复制覆盖工程的src;另外还要使用到\zxing-1.6\android\下的PlanarYUVLuminanceSource.java。
PS:\zxing-1.6\android\ 是BarcodeScanner的源码,本文程序相当于BarcodeScanner的精简版,只保留最基本的识别功能。
源码目录结果如下图,ChecksumException.java下面还有很多源文件,截图尚未列出:
main.xml源码如下,main.xml必须要用到FrameLayout才能重叠控件实现“范围框”的效果:
-
<?
xml
version
=
"1.0"
encoding
=
"utf-8"
?>
-
<
FrameLayout
android:id
=
"@+id/FrameLayout01"
-
android:layout_width
=
"fill_parent"
android:layout_height
=
"fill_parent"
-
xmlns:android
=
"http://schemas.android.com/apk/res/android"
>
-
<
SurfaceView
android:layout_height
=
"fill_parent"
-
android:id
=
"@+id/sfvCamera"
android:layout_width
=
"fill_parent"
>
</
SurfaceView
>
-
<
RelativeLayout
android:id
=
"@+id/RelativeLayout01"
-
android:layout_height
=
"fill_parent"
android:layout_width
=
"fill_parent"
>
-
<
ImageView
android:id
=
"@+id/ImageView01"
-
android:layout_height
=
"100dip"
android:layout_width
=
"160dip"
>
</
ImageView
>
-
<
View
android:layout_centerVertical
=
"true"
-
android:layout_centerHorizontal
=
"true"
android:layout_width
=
"300dip"
-
android:background
=
"#55FF6666"
android:id
=
"@+id/centerView"
-
android:layout_height
=
"180dip"
>
</
View
>
-
<
TextView
android:layout_centerHorizontal
=
"true"
-
android:layout_width
=
"wrap_content"
android:layout_below
=
"@+id/centerView"
-
android:layout_height
=
"wrap_content"
android:text
=
"Scanning..."
-
android:id
=
"@+id/txtScanResult"
android:textColor
=
"#FF000000"
>
</
TextView
>
-
</
RelativeLayout
>
-
</
FrameLayout
>
testCamera.java是主类,负责控制Camera和对图像做解码,源码如下:
-
package
com.testCamera;
-
import
java.util.Timer;
-
import
java.util.TimerTask;
-
import
com.google.zxing.BinaryBitmap;
-
import
com.google.zxing.MultiFormatReader;
-
import
com.google.zxing.Result;
-
import
com.google.zxing.Android.PlanarYUVLuminanceSource;
-
import
com.google.zxing.common.HybridBinarizer;
-
import
android.app.Activity;
-
import
android.graphics.Bitmap;
-
import
android.hardware.Camera;
-
import
android.os.Bundle;
-
import
android.view.SurfaceView;
-
import
android.view.View;
-
import
android.widget.ImageView;
-
import
android.widget.TextView;
-
public
class
testCamera
extends
Activity {
-
-
private
SurfaceView sfvCamera;
-
private
SFHCamera sfhCamera;
-
private
ImageView imgView;
-
private
View centerView;
-
private
TextView txtScanResult;
-
private
Timer mTimer;
-
private
MyTimerTask mTimerTask;
-
-
final
static
int
width =
480
;
-
final
static
int
height =
320
;
-
int
dstLeft, dstTop, dstWidth, dstHeight;
-
@Override
-
public
void
onCreate(Bundle savedInstanceState) {
-
super
.onCreate(savedInstanceState);
-
setContentView(R.layout.main);
-
this
.setTitle(
"Android条码/二维码识别Demo-----hellogv"
);
-
imgView = (ImageView) this
.findViewById(R.id.ImageView01);
-
centerView = (View) this
.findViewById(R.id.centerView);
-
sfvCamera = (SurfaceView) this
.findViewById(R.id.sfvCamera);
-
sfhCamera = new
SFHCamera(sfvCamera.getHolder(), width, height,
-
previewCallback);
-
txtScanResult=(TextView)this
.findViewById(R.id.txtScanResult);
-
-
mTimer = new
Timer();
-
mTimerTask = new
MyTimerTask();
-
mTimer.schedule(mTimerTask, 0
,
80
);
-
}
-
-
class
MyTimerTask
extends
TimerTask {
-
@Override
-
public
void
run() {
-
if
(dstLeft ==
0
) {
-
dstLeft = centerView.getLeft() * width
-
/ getWindowManager().getDefaultDisplay().getWidth();
-
dstTop = centerView.getTop() * height
-
/ getWindowManager().getDefaultDisplay().getHeight();
-
dstWidth = (centerView.getRight() - centerView.getLeft())* width
-
/ getWindowManager().getDefaultDisplay().getWidth();
-
dstHeight = (centerView.getBottom() - centerView.getTop())* height
-
/ getWindowManager().getDefaultDisplay().getHeight();
-
}
-
sfhCamera.AutoFocusAndPreviewCallback();
-
}
-
}
-
-
-
-
private
Camera.PreviewCallback previewCallback =
new
Camera.PreviewCallback() {
-
@Override
-
public
void
onPreviewFrame(
byte
[] data, Camera arg1) {
-
-
PlanarYUVLuminanceSource source = new
PlanarYUVLuminanceSource(
-
data, width, height, dstLeft, dstTop, dstWidth, dstHeight);
-
-
Bitmap mBitmap = source.renderCroppedGreyscaleBitmap();
-
-
imgView.setImageBitmap(mBitmap);
-
BinaryBitmap bitmap = new
BinaryBitmap(
new
HybridBinarizer(source));
-
MultiFormatReader reader = new
MultiFormatReader();
-
try
{
-
Result result = reader.decode(bitmap);
-
String strResult = "BarcodeFormat:"
-
+ result.getBarcodeFormat().toString() + " text:"
-
+ result.getText();
-
txtScanResult.setText(strResult);
-
} catch
(Exception e) {
-
txtScanResult.setText("Scanning"
);
-
}
-
}
-
};
-
}
SFHCamera.java是Camera控制类,源码如下:
-
package
com.testCamera;
-
import
java.io.IOException;
-
import
android.graphics.PixelFormat;
-
import
android.hardware.Camera;
-
import
android.util.Log;
-
import
android.view.SurfaceHolder;
-
public
class
SFHCamera
implements
SurfaceHolder.Callback{
-
private
SurfaceHolder holder =
null
;
-
private
Camera mCamera;
-
private
int
width,height;
-
private
Camera.PreviewCallback previewCallback;
-
-
public
SFHCamera(SurfaceHolder holder,
int
w,
int
h,Camera.PreviewCallback previewCallback) {
-
this
.holder = holder;
-
this
.holder.addCallback(
this
);
-
this
.holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
-
width=w;
-
height=h;
-
this
.previewCallback=previewCallback;
-
}
-
-
@Override
-
public
void
surfaceChanged(SurfaceHolder arg0,
int
arg1,
int
arg2,
int
arg3) {
-
Camera.Parameters parameters = mCamera.getParameters();
-
parameters.setPreviewSize(width, height);
-
parameters.setPictureFormat(PixelFormat.JPEG);
-
mCamera.setParameters(parameters);
-
mCamera.startPreview();
-
Log.e("Camera"
,
"surfaceChanged"
);
-
}
-
@Override
-
public
void
surfaceCreated(SurfaceHolder arg0) {
-
mCamera = Camera.open();
-
try
{
-
mCamera.setPreviewDisplay(holder);
-
Log.e("Camera"
,
"surfaceCreated"
);
-
} catch
(IOException e) {
-
mCamera.release();
-
mCamera = null
;
-
}
-
-
}
-
@Override
-
public
void
surfaceDestroyed(SurfaceHolder arg0) {
-
mCamera.setPreviewCallback(null
);
-
mCamera.stopPreview();
-
mCamera = null
;
-
Log.e("Camera"
,
"surfaceDestroyed"
);
-
}
-
-
-
-
public
void
AutoFocusAndPreviewCallback()
-
{
-
if
(mCamera!=
null
)
-
mCamera.autoFocus(mAutoFocusCallBack);
-
}
-
-
-
-
-
private
Camera.AutoFocusCallback mAutoFocusCallBack =
new
Camera.AutoFocusCallback() {
-
-
@Override
-
public
void
onAutoFocus(
boolean
success, Camera camera) {
-
if
(success) {
-
mCamera.setOneShotPreviewCallback(previewCallback);
-
}
-
}
-
};
-
-
-
}
其中testCamera.java的Camera.PreviewCallback previewCallback 是整个程序的逻辑核心,作为回调函数给SFHCamera.java的内部Camera类调用。
分享到:
相关推荐
在Android上使用ZXing识别条形码/二维码 . 来自http://blog.csdn.net/hellogv/ 从pudn移过来的,好多人没有pudn的帐号。
android上使用ZXing识别条形码和二维码,代码简单易懂,相信能帮助读者迅速掌握相关的开发
快速存储电子名片越来越多的手机具备自动对焦的拍摄功能,这也意味着这些手机可以具备条码扫描的功能.......手机具备条码扫描的功能,可以优化购物流程,快速存储电子名片(二维码)等。(二维码)等。
(安卓APP项目源代码)使用ZXing识别条码二维码(安卓APP项目源代码)使用ZXing识别条码二维码(安卓APP项目源代码)使用ZXing识别条码二维码(安卓APP项目源代码)使用ZXing识别条码二维码(安卓APP项目源代码)使用...
Android项目使用ZXing识别条码二维码(简单的实现).rar
根据zxing开发的条码/二维码扫描、识别生成功能,支持从手机选择图片识别,简化源码,去掉用不到的包
Android应用源码使用ZXing识别条码二维码(简单的实现).zip
ZXing是个很经典的条码/二维码识别的开源类库,早在很久以前,就有开发者在J2ME上使用ZXing了,只不过需要支持JSR-234规范(自动对焦)的手机才能发挥其威力,而目前已经有不少Android手机具备自动对焦的功能。...
安卓Android源码——使用ZXing识别条码二维码(简单的实现).zip
使用ZXing识别条码二维码(简单的实现)_Android
使用ZXing识别条码二维码(简单的实现
适合学习Android的同学和基于毕业生学习和参考,Android studio、idea、eclipse可以运行,建议使用Android studio或者idea
打开摄像头 扫描二维码 并显示, 由控件下的原Demo-vclTestApp进行改编, 有兴趣的可以看看。