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. */
	@Override
	public 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() {
			
			@Override
			public void onClick(View v) {
				MipcaActivityCapture.this.finish();
				
			}
		});
		hasSurface = false;
		inactivityTimer = new InactivityTimer(this);
	}

	@Override
	protected 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;
		
	}

	@Override
	protected void onPause() {
		super.onPause();
		if (handler != null) {
			handler.quitSynchronously();
			handler = null;
		}
		CameraManager.get().closeDriver();
	}

	@Override
	protected 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);
		}
	}

	@Override
	public void surfaceChanged(SurfaceHolder holder, int format, int width,
			int height) {

	}

	@Override
	public void surfaceCreated(SurfaceHolder holder) {
		if (!hasSurface) {
			hasSurface = true;
			initCamera(holder);
		}

	}

	@Override
	public 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_8888
			Bitmap 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:
代码片段,双击复制
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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:
代码片段,双击复制
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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
代码片段,双击复制
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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








posted @ 2015-03-13 19:45  若 ♂ 只如初见  阅读(2181)  评论(0编辑  收藏  举报