• 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:

    代码片段,双击复制
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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:
    代码片段,双击复制
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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
    代码片段,双击复制
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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:
    代码片段,双击复制
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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:
    代码片段,双击复制
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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:
    代码片段,双击复制
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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:
    代码片段,双击复制
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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








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  • 原文地址:https://www.cnblogs.com/lbangel/p/4335882.html
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