android条形码编解码
对条形码的编解码可以用barcode库和zxing库，但对于android ，barcode库中的BufferedImage不能使用，我所看到的用得较多的是zxing库，地址在http://code.google.com/p/zxing/?里面有库的源码与几种平台的例子。里面的例子只支持横屏模式下，要支持竖屏得对其进行修改。步骤如下：
1.在DecodeHandler.java中，修改decode方法
? PlanarYUVLuminanceSource source = CameraManager.get().buildLuminanceSource(data, width, height);
为
??? byte[] rotatedData = new byte[data.length];
??? for (int y = 0; y < height; y++) {
??????? for (int x = 0; x < width; x++)
??????????? rotatedData[x * height + height - y - 1] = data[x + y * width];
??? }
??? int tmp = width; // Here we are swapping, that's the difference to #11
??? width = height;
??? height = tmp;
?? ?
??? PlanarYUVLuminanceSource source = CameraManager.get().buildLuminanceSource(rotatedData, width, height);
2.在CameraManager.java中，注释代码：
??????????? // rect.left = rect.left * cameraResolution.x / screenResolution.x;
??????????? // rect.right = rect.right * cameraResolution.x / screenResolution.x;
??????????? // rect.top = rect.top * cameraResolution.y / screenResolution.y;
??????????? // rect.bottom = rect.bottom * cameraResolution.y / screenResolution.y;
修改为
??????????? rect.left = rect.left * cameraResolution.y / screenResolution.x;
??????????? rect.right = rect.right * cameraResolution.y / screenResolution.x;
??????????? rect.top = rect.top * cameraResolution.x / screenResolution.y;
??????????? rect.bottom = rect.bottom * cameraResolution.x / screenResolution.y;
3.在CameraConfigurationManager.java中，在setDesiredCameraParameters方法中添加一句
? camera.setDisplayOrientation(90);
4.在AndroidManifest.xml中，把Activity的属性android:screenOrientation="landscape"
改为
? android:screenOrientation="portrait"
编译运行即可！
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参考：
http://code.google.com/p/zxing/issues/detail?id=178#c46
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代码：
https://github.com/pplante/zxing-android
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解码实际是对摄像头获得的数据的yuv数据进行解码
注：setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE); 设置后或者在mainfest配置文件中landscape后，onconfigruationChanged不被调用，所以不能用来判断横竖屏
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对于解码要支持横竖屏得涉及方向的判断，这儿有几篇文章可以参考：
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yuv数据的转换
http://chenweihuacwh.iteye.com/blog/571223
通过senser获得屏幕旋转
http://blog.csdn.net/a345017062/article/details/6592527
传感器设计的指南针
http://blog.csdn.net/tinya0913/article/details/6057637
通过orientationeventListener判断手机横竖指向
http://androidbiancheng.blogspot.jp/2011/05/orientationeventlistener.html
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package com.AndroidOrientation;import android.app.Activity;import android.content.Context;import android.hardware.SensorManager;import android.os.Bundle;import android.view.OrientationEventListener;import android.widget.TextView;import android.widget.Toast;public class AndroidOrientation extends Activity{TextView orientation;MyOrientationEventListener myOrientationEventListener; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); orientation = (TextView)findViewById(R.id.orientation); myOrientationEventListener = new MyOrientationEventListener(this, SensorManager.SENSOR_DELAY_NORMAL); if (myOrientationEventListener.canDetectOrientation()){ myOrientationEventListener.enable(); }else{ Toast.makeText(AndroidOrientation.this, "Can't DetectOrientation!", Toast.LENGTH_LONG).show(); } } @Overrideprotected void onDestroy() { // TODO Auto-generated method stub super.onDestroy(); myOrientationEventListener.disable();}class MyOrientationEventListener extends OrientationEventListener{ public MyOrientationEventListener(Context context, int rate) { super(context, rate); // TODO Auto-generated constructor stub } @Override public void onOrientationChanged(int arg0) { // TODO Auto-generated method stub orientation.setText(String.valueOf(arg0)); } }}??