Android(安卓)studio 二维码开源项目ZXing使用详解

ZXing的github

https://github.com/zxing/zxing

ZXing的库很大。但是我们需要的只有以下三个

首先新建一个Project，将android(Eclipse 工程) 导入到Project中，并改为library（鹅，不会的百度）,直接导入是会报错的，因为缺少一些东西，把刚android-studio中的CameraConfigurationUtils.java也加入到导入的module。

接着就是core的jar包

引用：Android Studio生成自定义jar包

新建一个library的module，将core中的代码拷贝进去，然后在gradle文件中配置

dependencies {    compile fileTree(dir: 'libs', include: ['*.jar'])    testCompile 'junit:junit:4.12'    compile 'com.android.support:appcompat-v7:23.4.0'} def SDK_BASENAME = "TestSdk";def SDK_VERSION = "_V1.0";def sdkDestinationPath = "build";def zipFile = file('build/intermediates/bundles/release/classes.jar') task deleteBuild(type: Delete) {    delete sdkDestinationPath + SDK_BASENAME + SDK_VERSION + ".jar"} task makeJar(type: Jar) {    from zipTree(zipFile)    from fileTree(dir: 'src/main',includes: ['assets/**'])    baseName = SDK_BASENAME + SDK_VERSION    destinationDir = file(sdkDestinationPath)} makeJar.dependsOn(deleteBuild, build)

SDK_BASENAME = "TestSdk";SDK_VERSION = "_V1.0"; 是定义生成jar的名字为TestSdk_V1.0.ja

接着打开studo的gradle视图，core->tast->other->makejar,运行makejar任务

成功后就生成了所需要的jar包，将jar放入到android的libs下

然后就是把剩下的错误改掉，就不详细说了

界面定制

引用：

链接1

链接2

CaptureActivity

ZXing暴露的调用Activity。在handleDecode方法中对扫码成功后的动作作处理。

public void handleDecode(Result rawResult, Bitmap barcode, float scaleFactor) {    inactivityTimer.onActivity();    String resultString = rawResult.getText();    if (resultString.equals("")) {      Toast.makeText(CaptureActivity.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);    }    finish();  }

ViewfinderView

ZXing扫码窗口的绘制，原始的ZXing使用这种方式去绘制。我就直接引用别人定制的代码。

public final class ViewfinderView extends View {  private static final String TAG = "log";  /**   * 刷新界面的时间   */  private static final long ANIMATION_DELAY = 10L;  private static final int OPAQUE = 0xFF;  /**   * 四个绿色边角对应的长度   */  private int ScreenRate;  /**   * 四个绿色边角对应的宽度   */  private static final int CORNER_WIDTH = 10;  /**   * 扫描框中的中间线的宽度   */  private static final int MIDDLE_LINE_WIDTH = 6;  /**   * 扫描框中的中间线的与扫描框左右的间隙   */  private static final int MIDDLE_LINE_PADDING = 5;  /**   * 中间那条线每次刷新移动的距离   */  private static final int SPEEN_DISTANCE = 5;  /**   * 手机的屏幕密度   */  private static float density;  /**   * 字体大小   */  private static final int TEXT_SIZE = 16;  /**   * 字体距离扫描框下面的距离   */  private static final int TEXT_PADDING_TOP = 30;  /**   * 画笔对象的引用   */  private Paint paint;  /**   * 中间滑动线的最顶端位置   */  private int slideTop;  /**   * 中间滑动线的最底端位置   */  private int slideBottom;  private Bitmap resultBitmap;  private final int maskColor;  private final int resultColor;  private final int resultPointColor;  private Collection possibleResultPoints;  private Collection lastPossibleResultPoints;  boolean isFirst;  private CameraManager cameraManager;  public ViewfinderView(Context context, AttributeSet attrs) {    super(context, attrs);    density = context.getResources().getDisplayMetrics().density;    //将像素转换成dp    ScreenRate = (int)(20 * density);    paint = new Paint();    Resources resources = getResources();    maskColor = resources.getColor(R.color.viewfinder_mask);    resultColor = resources.getColor(R.color.result_view);    resultPointColor = resources.getColor(R.color.possible_result_points);    possibleResultPoints = new HashSet(5);  }  public void setCameraManager(CameraManager cameraManager) {    this.cameraManager = cameraManager;  }  @Override  public void onDraw(Canvas canvas) {    //中间的扫描框，你要修改扫描框的大小，去CameraManager里面修改    Rect frame = cameraManager.getFramingRect();    if (frame == null) {      return;    }    //初始化中间线滑动的最上边和最下边    if(!isFirst){      isFirst = true;      slideTop = frame.top;      slideBottom = frame.bottom;    }    //获取屏幕的宽和高    int width = canvas.getWidth();    int height = canvas.getHeight();    paint.setColor(resultBitmap != null ? resultColor : maskColor);    //画出扫描框外面的阴影部分，共四个部分，扫描框的上面到屏幕上面，扫描框的下面到屏幕下面    //扫描框的左边面到屏幕左边，扫描框的右边到屏幕右边    canvas.drawRect(0, 0, width, frame.top, paint);    canvas.drawRect(0, frame.top, frame.left, frame.bottom + 1, paint);    canvas.drawRect(frame.right + 1, frame.top, width, frame.bottom + 1,            paint);    canvas.drawRect(0, frame.bottom + 1, width, height, paint);    if (resultBitmap != null) {      // Draw the opaque result bitmap over the scanning rectangle      paint.setAlpha(OPAQUE);      canvas.drawBitmap(resultBitmap, frame.left, frame.top, paint);    } else {      //画扫描框边上的角，总共8个部分      paint.setColor(Color.GREEN);      canvas.drawRect(frame.left, frame.top, frame.left + ScreenRate,              frame.top + CORNER_WIDTH, paint);      canvas.drawRect(frame.left, frame.top, frame.left + CORNER_WIDTH, frame.top              + ScreenRate, paint);      canvas.drawRect(frame.right - ScreenRate, frame.top, frame.right,              frame.top + CORNER_WIDTH, paint);      canvas.drawRect(frame.right - CORNER_WIDTH, frame.top, frame.right, frame.top              + ScreenRate, paint);      canvas.drawRect(frame.left, frame.bottom - CORNER_WIDTH, frame.left              + ScreenRate, frame.bottom, paint);      canvas.drawRect(frame.left, frame.bottom - ScreenRate,              frame.left + CORNER_WIDTH, frame.bottom, paint);      canvas.drawRect(frame.right - ScreenRate, frame.bottom - CORNER_WIDTH,              frame.right, frame.bottom, paint);      canvas.drawRect(frame.right - CORNER_WIDTH, frame.bottom - ScreenRate,              frame.right, frame.bottom, paint);      //绘制中间的线,每次刷新界面，中间的线往下移动SPEEN_DISTANCE      slideTop += SPEEN_DISTANCE;      if(slideTop >= frame.bottom){        slideTop = frame.top;      }      canvas.drawRect(frame.left + MIDDLE_LINE_PADDING, slideTop - MIDDLE_LINE_WIDTH/2, frame.right - MIDDLE_LINE_PADDING,slideTop + MIDDLE_LINE_WIDTH/2, paint);      //画扫描框下面的字      paint.setColor(Color.WHITE);      paint.setTextSize(TEXT_SIZE * density);      paint.setAlpha(0x40);      paint.setTypeface(Typeface.create("System", Typeface.BOLD));      canvas.drawText(getResources().getString(R.string.scan_text), frame.left, (float) (frame.bottom + (float)TEXT_PADDING_TOP *density), paint);      Collection currentPossible = possibleResultPoints;      Collection currentLast = lastPossibleResultPoints;      if (currentPossible.isEmpty()) {        lastPossibleResultPoints = null;      } else {        possibleResultPoints = new HashSet(5);        lastPossibleResultPoints = currentPossible;        paint.setAlpha(OPAQUE);        paint.setColor(resultPointColor);        for (ResultPoint point : currentPossible) {          canvas.drawCircle(frame.left + point.getX(), frame.top                  + point.getY(), 6.0f, paint);        }      }      if (currentLast != null) {        paint.setAlpha(OPAQUE / 2);        paint.setColor(resultPointColor);        for (ResultPoint point : currentLast) {          canvas.drawCircle(frame.left + point.getX(), frame.top                  + point.getY(), 3.0f, paint);        }      }      //只刷新扫描框的内容，其他地方不刷新      postInvalidateDelayed(ANIMATION_DELAY, frame.left, frame.top,              frame.right, frame.bottom);    }  }  public void drawViewfinder() {    resultBitmap = null;    invalidate();  }  /**   * Draw a bitmap with the result points highlighted instead of the live   * scanning display.   *   * @param barcode   *            An image of the decoded barcode.   */  public void drawResultBitmap(Bitmap barcode) {    resultBitmap = barcode;    invalidate();  }  public void addPossibleResultPoint(ResultPoint point) {    possibleResultPoints.add(point);  }}

CameraConfigurationManager

修改横竖屏、处理变形效果的核心类。源码用的是横屏，如果切换竖屏图像会变形。

在public void setDesiredCameraParameters(Camera camera, boolean safeMode)方法可以将扫描改为竖屏：zai

在Log.i(TAG, "Screen resolution in current orientation: " + screenResolution); 后添加

Point screenResolutionForCamera = new Point();screenResolutionForCamera.x = screenResolution.x;screenResolutionForCamera.y = screenResolution.y;if (screenResolution.x < screenResolution.y) {  screenResolutionForCamera.x = screenResolution.y;  screenResolutionForCamera.y = screenResolution.x;}

然后修改如下代码

cameraResolution = CameraConfigurationUtils.findBestPreviewSizeValue(parameters, screenResolutionForCamera);bestPreviewSize = CameraConfigurationUtils.findBestPreviewSizeValue(parameters, screenResolutionForCamera);

EncodeingUtils.java 将文字转换为二维码的工具类

public class EncodingUtils {    public static final Bitmap createQRCode(String contentsToEncode,int dimension) {        if (contentsToEncode == null) {            return null;        }        Map hints = null;        String encoding = guessAppropriateEncoding(contentsToEncode);        if (encoding != null) {            hints = new EnumMap<>(EncodeHintType.class);            hints.put(EncodeHintType.CHARACTER_SET, encoding);        }        BitMatrix result;        try {            BarcodeFormat barcodeFormat = BarcodeFormat.QR_CODE;            result = new MultiFormatWriter().encode(contentsToEncode,  barcodeFormat, dimension, dimension, hints);        } catch (Exception iae) {            // Unsupported format            return null;        }        int width = result.getWidth();        int height = result.getHeight();        int[] pixels = new int[width * height];        for (int y = 0; y < height; y++) {            int offset = y * width;            for (int x = 0; x < width; x++) {                pixels[offset + x] = result.get(x, y) ? BLACK : WHITE;            }        }        Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);        bitmap.setPixels(pixels, 0, width, 0, 0, width, height);        return bitmap;    }    private static String guessAppropriateEncoding(CharSequence contents) {        // Very crude at the moment        for (int i = 0; i < contents.length(); i++) {            if (contents.charAt(i) > 0xFF) {                return "UTF-8";            }        }        return null;    }}

还有些细节上的调整就不说了，自己看看也能搞定了.

接着就是例子了

public class MainActivity extends AppCompatActivity {    private TextView tvShow;    private EditText etInput;    private ImageView ivQR;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        tvShow = (TextView) findViewById(R.id.show);        etInput = (EditText) findViewById(R.id.input);        ivQR = (ImageView) findViewById(R.id.iv);    }    public void scan(View view){        Toast.makeText(this, "可以开始扫描", Toast.LENGTH_SHORT).show();        Intent intent=new Intent();        intent.setClass(this, CaptureActivity.class);        startActivityForResult(intent,0);    }    public void gene(View view){        String input=etInput.getText().toString();        if (TextUtils.isEmpty(input)) {        }        else {            try {                Bitmap qrCode = EncodingUtils.createQRCode(input,400);                ivQR.setImageBitmap(qrCode);            } catch (Exception e) {                // TODO Auto-generated catch block                e.printStackTrace();            }        }    }    @Override    protected void onActivityResult(int requestCode, int resultCode, Intent data) {        super.onActivityResult(requestCode, resultCode, data);        if (resultCode==RESULT_OK) {            String result=data.getStringExtra("result");            tvShow.setText(result);        }    }

最后附上github地址

https://github.com/keroro2015/ZXing

CaptureActivity

ViewfinderView

CameraConfigurationManager

EncodeingUtils.java 将文字转换为二维码的工具类

接着就是例子了

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