Android zxing 解析二維碼，產生二維碼極簡demo

標籤：

zxing 官方的代碼很多，看起來很費勁，此demo只抽取了有用的部分，實現了相機預覽解碼，解析本地二維碼，產生二維碼三個功能。

簡化後的結構如下：

 

廢話少說直接上代碼：

BaseDecodeHandler：

package com.song.zxing.decode;import android.graphics.Bitmap;import android.os.Bundle;import com.google.zxing.BarcodeFormat;import com.google.zxing.DecodeHintType;import com.google.zxing.MultiFormatReader;import com.google.zxing.PlanarYUVLuminanceSource;import java.io.ByteArrayOutputStream;import java.util.ArrayList;import java.util.Collection;import java.util.EnumMap;import java.util.EnumSet;import java.util.Map;/** * Created by Administrator on 2015/12/16. */public class BaseDecodeHandler {    MultiFormatReader multiFormatReader;    public BaseDecodeHandler() {        initReader();    }    private void initReader() {        multiFormatReader = new MultiFormatReader();        Map<DecodeHintType, Object> hints = new EnumMap<DecodeHintType, Object>(DecodeHintType.class);        Collection<BarcodeFormat> decodeFormats = new ArrayList<BarcodeFormat>();        decodeFormats.addAll(EnumSet.of(BarcodeFormat.QR_CODE));        decodeFormats.addAll(EnumSet.of(BarcodeFormat.CODABAR));        hints.put(DecodeHintType.POSSIBLE_FORMATS, decodeFormats);        multiFormatReader.setHints(hints);    }    public Bundle getThumbData(PlanarYUVLuminanceSource source) {        Bundle bundle = new Bundle();        int[] pixels = source.renderThumbnail();        int width = source.getThumbnailWidth();        int height = source.getThumbnailHeight();        Bitmap bitmap = Bitmap.createBitmap(pixels, 0, width, width, height, Bitmap.Config.ARGB_8888);        ByteArrayOutputStream out = new ByteArrayOutputStream();        bitmap.compress(Bitmap.CompressFormat.JPEG, 50, out);        bundle.putByteArray("data", out.toByteArray());        return bundle;    }}

　　

PreviewDecodeHandler：

package com.song.zxing.decode;import android.graphics.Rect;import android.hardware.Camera;import android.os.Handler;import android.os.Message;import com.google.zxing.BinaryBitmap;import com.google.zxing.PlanarYUVLuminanceSource;import com.google.zxing.ReaderException;import com.google.zxing.Result;import com.google.zxing.common.HybridBinarizer;import com.song.zxing.util.Constant;/** * Created by Administrator on 2015/12/16. */public class PreviewDecodeHandler extends BaseDecodeHandler implements Camera.PreviewCallback {    private Rect rect;    private boolean running;    private Handler handler;    public PreviewDecodeHandler(Rect rect, Handler handler) {        this.rect = rect;        this.handler = handler;    }    @Override    public void onPreviewFrame(byte[] data, Camera camera) {        if (running) {            return;        }        decode(data, camera);    }    private void decode(byte[] data, Camera camera) {        Camera.Size size = camera.getParameters().getPreviewSize();        running = true;        // 這裡需要將擷取的data翻轉一下，因為相機預設拿的的橫屏的資料        byte[] rotatedData = new byte[data.length];        for (int y = 0; y < size.height; y++) {            for (int x = 0; x < size.width; x++)                rotatedData[x * size.height + size.height - y - 1] = data[x + y * size.width];        }        // 寬高也要調整        int tmp = size.width;        size.width = size.height;        size.height = tmp;        Result rawResult = null;        // Go ahead and assume it‘s YUV rather than die.        PlanarYUVLuminanceSource source = new PlanarYUVLuminanceSource(rotatedData, size.width, size.height, rect.left, rect.top, rect.width(), rect.height(), false);        BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));        try {            rawResult = multiFormatReader.decodeWithState(bitmap);        } catch (ReaderException re) {            // continue        } finally {            multiFormatReader.reset();        }        if (rawResult != null) {            if (handler != null) {                Message msg = Message.obtain(handler, Constant.VALUE_DECODE_SUCCESS, rawResult.getText());//                msg.setData(getThumbData(source)); // 去掉注釋可以拿到最終圖片                msg.sendToTarget();            }        }        running = false;    }}

　　

CameraView:

package com.song.zxing.ui;import android.app.Activity;import android.content.Context;import android.hardware.Camera;import android.util.AttributeSet;import android.view.SurfaceHolder;import android.view.SurfaceView;import com.song.zxing.App;import com.song.zxing.util.AutoFocusManager;import java.util.List;/** * use decrypted Api mCamera */public class CameraView extends SurfaceView implements SurfaceHolder.Callback {    private Camera mCamera;    private SurfaceHolder mHolder;    private AutoFocusManager autoFocusManager;    public CameraView(Context context) {        super(context);        init();    }    public CameraView(Context context, AttributeSet attrs) {        super(context, attrs);        init();    }    public CameraView(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);        init();    }    private void init() {        mHolder = getHolder();        mHolder.addCallback(this);    }    @Override    public void surfaceCreated(SurfaceHolder holder) {        try {            mCamera = Camera.open();        } catch (Exception e) {            e.printStackTrace();            App.toast("相機開啟失敗");            ((Activity) getContext()).finish();        }    }    @Override    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {        if (mHolder.getSurface() == null) {            return;        }        try {            mCamera.setDisplayOrientation(90);            mCamera.setPreviewDisplay(mHolder);            setPreviewSize();            start();        } catch (Exception e) {            e.printStackTrace();        }    }    @Override    public void surfaceDestroyed(SurfaceHolder holder) {        release();        autoFocusManager.stop();    }    private void setPreviewSize() {        if (mCamera == null) return;        Camera.Parameters parameters = mCamera.getParameters();        Camera.Size cameraSize = getOptimalPreviewSize(parameters.getSupportedPreviewSizes(), App.getScreenHeight(), App.getScreenWidth());        Camera.Size pictureSize = getOptimalPreviewSize(parameters.getSupportedPictureSizes(), App.getScreenHeight(), App.getScreenWidth());        parameters.setPreviewSize(cameraSize.width, cameraSize.height);        parameters.setPictureSize(pictureSize.width, pictureSize.height);        mCamera.setParameters(parameters);    }    private Camera.Size getOptimalPreviewSize(List<Camera.Size> sizes, int w, int h) {        final double ASPECT_TOLERANCE = 0.1;        double targetRatio = (double) w / h;        if (sizes == null) return null;        Camera.Size optimalSize = null;        double minDiff = Double.MAX_VALUE;        for (Camera.Size size : sizes) {            double ratio = (double) size.width / size.height;            if (Math.abs(ratio - targetRatio) > ASPECT_TOLERANCE) continue;            if (Math.abs(size.height - h) < minDiff) {                optimalSize = size;                minDiff = Math.abs(size.height - h);            }        }        // Cannot find the one match the aspect ratio, ignore the requirement        if (optimalSize == null) {            minDiff = Double.MAX_VALUE;            for (Camera.Size size : sizes) {                if (Math.abs(size.height - h) < minDiff) {                    optimalSize = size;                    minDiff = Math.abs(size.height - h);                }            }        }        return optimalSize;    }    public void capture(Camera.PictureCallback callback) {        if (mCamera != null)            mCamera.takePicture(null, null, callback);    }    public void stopPreview() {        if (mCamera != null)            mCamera.stopPreview();    }    public void setPreviewCallback(Camera.PreviewCallback callback) {        if (mCamera != null) {            mCamera.setPreviewCallback(callback);        }    }    private void start() {        if (mCamera != null) {            mCamera.startPreview();            autoFocusManager = new AutoFocusManager(mCamera);            if (listener != null) {                listener.initSuccess();            }        }    }    public void release() {        if (mCamera != null) {            mCamera.stopPreview();            mCamera.setPreviewCallback(null);            mCamera.release();            mCamera = null;        }    }    InitListener listener;    public void setInitListener(InitListener listener) {        this.listener = listener;    }    public interface InitListener {        void initSuccess();    }}

　　

ScreenOverlay:

package com.song.zxing.ui;import android.content.Context;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.Rect;import android.graphics.RectF;import android.util.AttributeSet;import android.view.View;import com.song.zxing.App;import com.song.zxing.R;/** * Created by Administrator on 2015/11/4. */public class ScreenOverlay extends View {    private RectF rectF;    private Paint paint;    private Bitmap rectBitmap;    private Bitmap lineBitmap;    private int lineOffset = 2;    private int rectBitmapWidth;    private int rectBitmapHeight;    public ScreenOverlay(Context context) {        super(context);    }    public ScreenOverlay(Context context, AttributeSet attrs) {        super(context, attrs);        initPoint();    }    public ScreenOverlay(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);    }    private void initPoint() {        rectBitmap = BitmapFactory.decodeResource(getResources(), R.mipmap.qr_capture);        lineBitmap = BitmapFactory.decodeResource(getResources(), R.mipmap.qr_scan_line);        int mScreenWidth = App.getScreenWidth();        int mScreenHeight = App.getScreenHeight();        rectBitmapWidth = rectBitmap.getWidth();        rectBitmapHeight = rectBitmap.getHeight();        float left = (mScreenWidth - rectBitmapWidth) / 2;        float top = (mScreenHeight - rectBitmapHeight - 20) / 2;        float right = left + rectBitmapWidth;        float bottom = top + rectBitmapHeight;        rectF = new RectF(left, top, right, bottom);        paint = new Paint();        paint.setColor(Color.parseColor("#60000000"));    }    @Override    public void draw(Canvas canvas) {        super.draw(canvas);        canvas.drawRect(0, 0, App.getScreenWidth(), rectF.top, paint);        canvas.drawRect(0, rectF.top, rectF.left, rectF.bottom, paint);        canvas.drawRect(0, rectF.bottom, App.getScreenWidth(), App.getScreenHeight(), paint);        canvas.drawRect(rectF.right, rectF.top, App.getScreenWidth(), rectF.bottom, paint);        canvas.drawBitmap(rectBitmap, rectF.left, rectF.top, paint);        canvas.drawBitmap(lineBitmap, null, getDstRect(rectF, lineOffset), paint);        lineOffset = lineOffset >= rectBitmapHeight - 10 ? 10 : lineOffset + 2;        invalidate();    }    private Rect getDstRect(RectF rectF, int offset) {        Rect rect = new Rect();        rect.left = (int) rectF.left;        rect.top = (int) rectF.top + offset;        rect.bottom = rect.top + App.dp2Px(2);        rect.right = (int) (rectF.left + rectBitmapWidth);        return rect;    }    public RectF getPreviewRectF() {        return rectF;    }    public Rect getPreviewRect() {        Rect rect = new Rect();        rectF.round(rect);        return rect;    }    public void stopScan() {    }}

　　

TestActivity:

package com.song.zxing;import android.app.Activity;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.os.Bundle;import android.os.Environment;import android.os.Handler;import android.os.Message;import android.view.View;import android.widget.Button;import com.song.zxing.decode.BitmapDecodeHandler;import com.song.zxing.decode.PreviewDecodeHandler;import com.song.zxing.encode.QRCreator;import com.song.zxing.ui.CameraView;import com.song.zxing.ui.ScreenOverlay;import com.song.zxing.util.BitmapUtil;import com.song.zxing.util.Constant;/** * Created by Administrator on 2015/12/16. */public class TestActivity extends Activity {    CameraView cameraView;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.test);        cameraView = (CameraView) findViewById(R.id.cameraView);        final ScreenOverlay overlay = (ScreenOverlay) findViewById(R.id.overlay);        cameraView.setInitListener(new CameraView.InitListener() {            @Override            public void initSuccess() {                cameraView.setPreviewCallback(new PreviewDecodeHandler(overlay.getPreviewRect(), handler));            }        });        findViewById(R.id.btn).setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                new BitmapDecodeHandler().start(BitmapFactory.decodeFile(Environment.getExternalStorageDirectory() + "/fuck.png"), handler);            }        });        findViewById(R.id.btn_createQr).setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                Bitmap bitmap = new QRCreator().createQRImage("this is a test string", 250, 250, BitmapFactory.decodeResource(getResources(), R.mipmap.ic_launcher));//                Bitmap bitmap = new QRCreator().createQRImage("this is a test string", 250, 250, null);                BitmapUtil.write2File(bitmap, Environment.getExternalStorageDirectory() + "/fuck.png");                App.toast("create complete!");            }        });    }    Handler handler = new Handler() {        @Override        public void handleMessage(Message msg) {            if (msg.what == Constant.VALUE_DECODE_SUCCESS) {                App.toast((String) msg.obj);                cameraView.setPreviewCallback(null);// stop decode            } else if (msg.what == Constant.VALUE_DECODE_FAIL) {                App.toast("decode Fail");            }        }    };    @Override    protected void onDestroy() {        super.onDestroy();        cameraView.release();        cameraView = null;    }}

　　詳細代碼見：http://download.csdn.net/detail/hesongxing/9365515

     註：工程代碼使用Android studio 開發。

Android zxing 解析二維碼，產生二維碼極簡demo