ZXing 二维码应用

1、导入zxing代码和包

2、下面的类是解析二维码的主要类。

package com.gaint.nebula.interaction.ui.zxing;import java.io.IOException;import java.util.Vector;import android.app.Activity;import android.content.Intent;import android.content.res.AssetFileDescriptor;import android.graphics.Bitmap;import android.media.AudioManager;import android.media.MediaPlayer;import android.media.MediaPlayer.OnCompletionListener;import android.os.Bundle;import android.os.Handler;import android.os.Vibrator;import android.view.SurfaceHolder;import android.view.SurfaceHolder.Callback;import android.view.SurfaceView;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.Toast;import com.gaint.nebula.interaction.R;import com.gaint.nebula.interaction.ui.BaseActivity;import com.google.zxing.BarcodeFormat;import com.google.zxing.Result;import com.mining.app.zxing.camera.CameraManager;import com.mining.app.zxing.decoding.CaptureActivityHandler;import com.mining.app.zxing.decoding.InactivityTimer;import com.mining.app.zxing.view.ViewfinderView;/** * Initial the camera * @author Ryan.Tang */public class MipcaActivityCapture extends BaseActivity implements Callback {private CaptureActivityHandler handler;private ViewfinderView viewfinderView;private boolean hasSurface;private Vector<BarcodeFormat> decodeFormats;private String characterSet;private InactivityTimer inactivityTimer;private MediaPlayer mediaPlayer;private boolean playBeep;private static final float BEEP_VOLUME = 0.10f;private boolean vibrate;/** Called when the activity is first created. */@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_capture);//ViewUtil.addTopView(getApplicationContext(), this, R.string.scan_card);CameraManager.init(getApplication());viewfinderView = (ViewfinderView) findViewById(R.id.viewfinder_view);Button mButtonBack = (Button) findViewById(R.id.button_back);mButtonBack.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {MipcaActivityCapture.this.finish();}});hasSurface = false;inactivityTimer = new InactivityTimer(this);}@Overrideprotected void onResume() {super.onResume();SurfaceView surfaceView = (SurfaceView) findViewById(R.id.preview_view);SurfaceHolder surfaceHolder = surfaceView.getHolder();if (hasSurface) {initCamera(surfaceHolder);} else {surfaceHolder.addCallback(this);surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);}decodeFormats = null;characterSet = null;playBeep = true;AudioManager audioService = (AudioManager) getSystemService(AUDIO_SERVICE);if (audioService.getRingerMode() != AudioManager.RINGER_MODE_NORMAL) {playBeep = false;}initBeepSound();vibrate = true;}@Overrideprotected void onPause() {super.onPause();if (handler != null) {handler.quitSynchronously();handler = null;}CameraManager.get().closeDriver();}@Overrideprotected void onDestroy() {inactivityTimer.shutdown();super.onDestroy();}/** * ����ɨ���� * @param result * @param barcode */public void handleDecode(Result result, Bitmap barcode) {inactivityTimer.onActivity();playBeepSoundAndVibrate();String resultString = result.getText();if (resultString.equals("")) {Toast.makeText(MipcaActivityCapture.this, "Scan failed!", Toast.LENGTH_SHORT).show();}else {Intent resultIntent = new Intent();Bundle bundle = new Bundle();bundle.putString("result", resultString);bundle.putParcelable("bitmap", barcode);resultIntent.putExtras(bundle);this.setResult(RESULT_OK, resultIntent);}MipcaActivityCapture.this.finish();}private void initCamera(SurfaceHolder surfaceHolder) {try {CameraManager.get().openDriver(surfaceHolder);} catch (IOException ioe) {return;} catch (RuntimeException e) {return;}if (handler == null) {handler = new CaptureActivityHandler(this, decodeFormats,characterSet);}}@Overridepublic void surfaceChanged(SurfaceHolder holder, int format, int width,int height) {}@Overridepublic void surfaceCreated(SurfaceHolder holder) {if (!hasSurface) {hasSurface = true;initCamera(holder);}}@Overridepublic void surfaceDestroyed(SurfaceHolder holder) {hasSurface = false;}public ViewfinderView getViewfinderView() {return viewfinderView;}public Handler getHandler() {return handler;}public void drawViewfinder() {viewfinderView.drawViewfinder();}private void initBeepSound() {if (playBeep && mediaPlayer == null) {// The volume on STREAM_SYSTEM is not adjustable, and users found it// too loud,// so we now play on the music stream.setVolumeControlStream(AudioManager.STREAM_MUSIC);mediaPlayer = new MediaPlayer();mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);mediaPlayer.setOnCompletionListener(beepListener);AssetFileDescriptor file = getResources().openRawResourceFd(R.raw.beep);try {mediaPlayer.setDataSource(file.getFileDescriptor(),file.getStartOffset(), file.getLength());file.close();mediaPlayer.setVolume(BEEP_VOLUME, BEEP_VOLUME);mediaPlayer.prepare();} catch (IOException e) {mediaPlayer = null;}}}private static final long VIBRATE_DURATION = 200L;private void playBeepSoundAndVibrate() {if (playBeep && mediaPlayer != null) {mediaPlayer.start();}if (vibrate) {Vibrator vibrator = (Vibrator) getSystemService(VIBRATOR_SERVICE);vibrator.vibrate(VIBRATE_DURATION);}}/** * When the beep has finished playing, rewind to queue up another one. */private final OnCompletionListener beepListener = new OnCompletionListener() {public void onCompletion(MediaPlayer mediaPlayer) {mediaPlayer.seekTo(0);}};}

3、调用此类：

Intent intent = new Intent();intent.setClass(BaseActivity.this, MipcaActivityCapture.class);intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);startActivityForResult(intent, SCANNIN_GREQUEST_CODE);

4、回传信息，可以看到二维码图片和内容。

 @Override    protected void onActivityResult(int requestCode, int resultCode, Intent data) {    if (requestCode == SCANNIN_GREQUEST_CODE) {    if (data==null) {return;}    Bitmap mBitmap = data.getParcelableExtra("bitmap");    final String result = data.getStringExtra("result");    Logger.getLogger().i(result+" -- "+mBitmap);    View view = LayoutInflater.from(this).inflate(R.layout.scan, null);    ImageView icon = (ImageView) view.findViewById(R.id.iv_scan_icon);    TextView textView = (TextView) view.findViewById(R.id.tv_scan_title);    icon.setImageBitmap(mBitmap);    textView.setText(result);    AlertDialog.Builder dialog = new AlertDialog.Builder(this);    dialog.setTitle("扫描结果");    dialog.setView(view);    dialog.setMessage(data.getDataString());    dialog.setNegativeButton("确定", new DialogInterface.OnClickListener() {    @Override    public void onClick(DialogInterface dialog, int which) {    // 用默认浏览器打开扫描得到的地址    Intent intent = new Intent();    intent.setAction("android.intent.action.VIEW");    Uri content_url = Uri.parse(result);    intent.setData(content_url);    startActivity(intent);    dialog.dismiss();    }    });    dialog.setPositiveButton("取消", new DialogInterface.OnClickListener() {    @Override    public void onClick(DialogInterface dialog, int which) {     dialog.dismiss();    }    });    dialog.create().show();}    super.onActivityResult(requestCode, resultCode, data);    }

5、生成二维码

/** * @类功能说明: 生成二维码图片示例 */public class CreateQRImageTest {private ImageView sweepIV;private int QR_WIDTH = 200, QR_HEIGHT = 200;/** * @方法功能说明: 生成二维码图片,实际使用时要初始化sweepIV,不然会报空指针错误 * @参数: @param url 要转换的地址或字符串,可以是中文 * @return void * @throws */// 要转换的地址或字符串,可以是中文public void createQRImage(String url) {try {// 判断URL合法性if (url == null || "".equals(url) || url.length() < 1) {return;}Hashtable<EncodeHintType, String> hints = new Hashtable<EncodeHintType, String>();hints.put(EncodeHintType.CHARACTER_SET, "utf-8");// 图像数据转换，使用了矩阵转换BitMatrix bitMatrix = new QRCodeWriter().encode(url,BarcodeFormat.QR_CODE, QR_WIDTH, QR_HEIGHT, hints);int[] pixels = new int[QR_WIDTH * QR_HEIGHT];// 下面这里按照二维码的算法，逐个生成二维码的图片，// 两个for循环是图片横列扫描的结果for (int y = 0; y < QR_HEIGHT; y++) {for (int x = 0; x < QR_WIDTH; x++) {if (bitMatrix.get(x, y)) {pixels[y * QR_WIDTH + x] = 0xff000000;} else {pixels[y * QR_WIDTH + x] = 0xffffffff;}}}// 生成二维码图片的格式，使用ARGB_8888Bitmap bitmap = Bitmap.createBitmap(QR_WIDTH, QR_HEIGHT,Bitmap.Config.ARGB_8888);bitmap.setPixels(pixels, 0, QR_WIDTH, 0, 0, QR_WIDTH, QR_HEIGHT);// 显示到一个ImageView上面sweepIV.setImageBitmap(bitmap);} catch (WriterException e) {e.printStackTrace();}}}

6、zxing包

http://www.cnblogs.com/weixing/archive/2013/08/28/3287120.html

ZXing开源项目Google Code地址：https://code.google.com/p/zxing/

ZXingDemo下载：ZXingDemo2013-8-25.rar 

 

二、修改二维码代码

1、是扫描二维码的文字居中。

找到类ViewfinderView，其中widthPixels是屏幕的宽度。

paint.setColor(Color.WHITE);paint.setTextSize(TEXT_SIZE * density);paint.setAlpha(0x40);paint.setTypeface(Typeface.create("System", Typeface.BOLD));//获取文字宽度，让其居中显示float wtext = paint.measureText(getResources().getString(R.string.scan_text));canvas.drawText(getResources().getString(R.string.scan_text), (widthPixels-wtext)/2, (float) (frame.bottom + (float)TEXT_PADDING_TOP *density), paint);

2、修改二维码窗口大小。默认情况下，窗口的大小是屏幕的四分之三，有最小值和最大值。

找到CameraManager类的getFramingRect方法，就可以看到。

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;  }

最近没事做了下二维码扫描，用的是ZXing的开源代码，官方源码地址：http://code.google.com/p/zxing/downloads/list；
我是在ZXing2.2基础上做的，因此只下载了ZXing-2.2.zip；
此外还需要ZXing的核心Jar包，下载地址：http://repo1.maven.org/maven2/com/google/zxing/core/2.2/，只需下载core-2.2.jar就行；
将下载的ZXing-2.2.zip解压出来，我们只需要用到android目录中的示例项目，如图：
 
将android项目导入eclipse，同时别忘了将core-2.2.jar导入libs，此时该示例项目应该可以运行了，不过该项目很多功能我们不需要，并且其扫描界面为横向的，因此需对其修改。

接下去我们来将该示例项目简化：
第一步：拷贝必要的包和类
新建自己的项目并导入core-2.2.jar，将示例项目中的必要代码全部拷贝到自己的项目中，至于示例项目中各个包和类的功能此处就不做解释的，有兴趣可以自己去研究下；
我自己对包结构做了一点改动，导入完成后会有很多红叉，大都和包的访问权限有关，因为示例代码中很多类是final型的，我们将其public就行；
此外还需要res下一些关联的文件（values下的color.xml、ids.xml、strings.xml，raw下的beep.ogg）。
初步调整后包结构如下：
 

第二步：PreferencesActivity和CaptureActivity修改
示例项目用到了大量的配置，因此很多地方都用到了PreferencesActivity这个类，其实留着它也无所谓，但别忘了将示例项目中res下一些关联文件拷贝过来（preferences.xml、arrays.xml）；
不过PreferencesActivity完全是多余的，看着也碍眼，因此我将其去掉，需要将用到PreferencesActivity的类都修改，就是剩余那些报红叉的类，我们需要将一些配置固定化，多余的设置判断去掉，此处我就不贴代码了；
同样CaptureActivity中也有很多方法是我们不需要的，大都是关于解码成功后的处理，如果要保留的话则需要额外拷贝很多类，因此将其去掉，此处也不贴代码了，附件源码中都有。

第三部：修改为竖屏
经过上面两步，我们自己的项目应该可以运行了（别忘了加权限），当然此时是横屏的，因此我们需要修改几处地方将其修改为竖屏：
1.CameraConfigurationManager类的initFromCameraParameters()方法中将以下代码注释掉：

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if(width < height) {

   Log.i(TAG,"Display reports portrait orientation; assuming this is incorrect");

   inttemp = width;

   width = height;

     height = temp;

   }

2.CameraConfigurationManager类的setDesiredCameraParameters()方法中在camera.setParameters(parameters)之前加入以下代码：

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camera.setDisplayOrientation(90);

3.CameraManager类的getFramingRectInPreview()方法中将以下代码替换：

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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;

替换为

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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;

4.DecodeHandler类的decode方法中在activity.getCameraManager().buildLuminanceSource()之前添加以下代码：

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byte[] rotatedData = newbyte[data.length];

for(inty = 0; y < height; y++) {

   for(intx = 0; x < width; x++)

        rotatedData[x * height + height - y - 1] = data[x + y * width];

        }

 inttmp = width;

 width = height;

 height = tmp;

 data = rotatedData;

5.很关键的一步，解决竖屏后图像拉伸问题。CameraConfigurationManager类的initFromCameraParameters()方法中：
在Log.i(TAG, "Screen resolution: " + screenResolution);之后添加以下代码：

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Point screenResolutionForCamera = newPoint();

screenResolutionForCamera.x = screenResolution.x;

screenResolutionForCamera.y = screenResolution.y;

if(screenResolution.x < screenResolution.y) {

   screenResolutionForCamera.x = screenResolution.y;

   screenResolutionForCamera.y = screenResolution.x;

   }

同时修改下一句为cameraResolution = findBestPreviewSizeValue(parameters,screenResolutionForCamera);

此外manifest中别忘了设置android:screenOrientation="portrait"，至此竖屏修改完毕。

第四步：扫描框位置和大小修改
此时的扫描框是竖直拉伸的矩形，很难看，我们可以将其修改为正方形或扁平型的。
CameraManager类的getFramingRect()方法中替换以下代码：

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intwidth = findDesiredDimensionInRange(screenResolution.x, MIN_FRAME_WIDTH, MAX_FRAME_WIDTH);

intheight = findDesiredDimensionInRange(screenResolution.y,MIN_FRAME_HEIGHT, MAX_FRAME_HEIGHT);

替换为

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DisplayMetrics metrics = context.getResources().getDisplayMetrics();

intwidth = (int) (metrics.widthPixels * 0.6);

intheight = (int) (width * 0.9);

此处我们根据屏幕分辨率来定扫描框大小更灵活一点，同时将偏移量topOffset修改为(screenResolution.y - height)/4

第五步：扫描框四个角和扫描线条修改
示例代码中的线条是居中且不动的，我们可以将其修改为上下移动的扫描线，且可以改变线条的样式。
在自定义扫描布局ViewfinderView类中的onDraw()方法中绘制四个角，关键代码如下：

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// 画出四个角

paint.setColor(getResources().getColor(R.color.green));

// 左上角

canvas.drawRect(frame.left, frame.top, frame.left + 15,frame.top + 5, paint);

canvas.drawRect(frame.left, frame.top, frame.left + 5,frame.top + 15, paint);

// 右上角

canvas.drawRect(frame.right - 15, frame.top, frame.right,frame.top + 5, paint);

canvas.drawRect(frame.right - 5, frame.top, frame.right,frame.top + 15, paint);

// 左下角

canvas.drawRect(frame.left, frame.bottom - 5, frame.left + 15,frame.bottom, paint);

canvas.drawRect(frame.left, frame.bottom - 15, frame.left + 5,frame.bottom, paint);

// 右下角

canvas.drawRect(frame.right - 15, frame.bottom - 5, frame.right,frame.bottom, paint);

canvas.drawRect(frame.right - 5, frame.bottom - 15, frame.right,frame.bottom, paint);

此外将扫描线条修改为上下扫描的线，关键代码如下：

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if((i += 5) < frame.bottom - frame.top) {

        /* 以下为用渐变线条作为扫描线 */

        // 渐变图为矩形

        // mDrawable.setShape(GradientDrawable.RECTANGLE);

        // 渐变图为线型

        // mDrawable.setGradientType(GradientDrawable.LINEAR_GRADIENT);

        // 线型矩形的四个圆角半径

        // // mDrawable

        // // .setCornerRadii(new float[] { 8, 8, 8, 8, 8, 8, 8, 8 });

        // 位置边界

        // mRect.set(frame.left + 10, frame.top + i, frame.right - 10,

        // frame.top + 1 + i);

        // 设置渐变图填充边界

        // mDrawable.setBounds(mRect);

        // 画出渐变线条

        // mDrawable.draw(canvas);

 

        /* 以下为图片作为扫描线 */

        mRect.set(frame.left - 6, frame.top + i - 6, frame.right + 6,frame.top + 6+ i);

        lineDrawable.setBounds(mRect);

        lineDrawable.draw(canvas);

 

        // 刷新

        invalidate();

       }else{

            i = 0;

       }

此处采用了两种线条样式，一种是渐变线条，还有一种是类似微信的图片扫描线。
详细代码请看附件源码。

运行截图如下：
 此为渐变线条              此为图片线条，用的是微信的图片，不过微信扫描用的应该是动画很平滑，此处用的是多次绘制

另外，扫描成功后的手机震动和提示音在BeepManager中修改，里面我额外放了两种提示音文件


示例源码工程，core包和我修改简化后的源码放都附件中

 ZXing示例源码和核心core包.rar (1010.76 KB, 下载次数: 36) 
 简化后源码.rar (2.38 MB, 下载次数: 293) 

http://blog.csdn.net/xinchen200/article/details/18036695