Android快速集成Zxing扫码库

今天为大家介绍的是我的github开源项目ZxingSimplify，一个精简的安卓Zxing扫码库。有了它你将分分钟集成扫码（包括二维码、条形码等）、相册二维码识别、开关闪光灯等功能。

一.扫码界面

二.使用

1.Gradle添加依赖，此库已同时提交到Jcenter、MavenCentral，最新版本1.0.5。

compile 'com.github.shenyuanqing.zxing:zxing-simplify:1.0.5'

2.跳转到扫码页CaptureActivity。

3.扫码成功在onActivityResult回调方法获得扫码结果。

4.Android6.0以上系统跳转扫码页前先获取运行时权限。代码如下：

package com.github.shenyuanqing.zxingtest;

import android.Manifest;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.view.View;
import android.widget.Toast;

import com.github.shenyuanqing.zxingsimplify.zxing.Activity.CaptureActivity;

public class MainActivity extends Activity {
    private Context mContext;
    private Activity mActivity;
    private static final int REQUEST_SCAN = 0;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mContext = this;
        mActivity = this;

        init();
    }

    private void init() {
        findViewById(R.id.bt_scan).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                getRuntimeRight();
            }
        });
    }

    /**
     * 获得运行时权限
     */
    private void getRuntimeRight() {
        if (ContextCompat.checkSelfPermission(mContext, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions(mActivity, new String[]{Manifest.permission.CAMERA}, 1);
        } else {
            jumpScanPage();
        }
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        switch (requestCode) {
            case 1:
                if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    jumpScanPage();
                } else {
                    Toast.makeText(mContext, "拒绝", Toast.LENGTH_LONG).show();
                }
            default:
                break;
        }
    }

    /**
     * 跳转到扫码页
     */
    private void jumpScanPage() {
        startActivityForResult(new Intent(MainActivity.this, CaptureActivity.class), REQUEST_SCAN);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == REQUEST_SCAN && resultCode == RESULT_OK) {
            Toast.makeText(MainActivity.this, data.getStringExtra("barCode"), Toast.LENGTH_LONG).show();
        }
    }
}

三.有些场景可能扫码成功后要先暂停扫码做些处理后再恢复扫码，此库也做了相应的支持（扫码线用属性动画控制，可以记录停止点），先调用CaptureActivity里的pauseScan()方法再调用startScan()方法。

CaptureActivity源码：

package com.github.shenyuanqing.zxingsimplify.zxing.Activity;

import android.Manifest;
import android.animation.ObjectAnimator;
import android.animation.ValueAnimator;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.ContentUris;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.content.res.Resources;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Rect;
import android.graphics.SurfaceTexture;
import android.hardware.Camera;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.os.Looper;
import android.provider.DocumentsContract;
import android.provider.MediaStore;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.text.TextUtils;
import android.util.Log;
import android.util.TypedValue;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.view.animation.LinearInterpolator;
import android.view.animation.TranslateAnimation;
import android.widget.CompoundButton;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.ToggleButton;


import com.github.shenyuanqing.zxingsimplify.R;
import com.github.shenyuanqing.zxingsimplify.zxing.camera.CameraManager;
import com.github.shenyuanqing.zxingsimplify.zxing.decode.DecodeThread;
import com.github.shenyuanqing.zxingsimplify.zxing.utils.BeepManager;
import com.github.shenyuanqing.zxingsimplify.zxing.utils.CaptureActivityHandler;
import com.github.shenyuanqing.zxingsimplify.zxing.utils.InactivityTimer;
import com.google.zxing.BinaryBitmap;
import com.google.zxing.ChecksumException;
import com.google.zxing.DecodeHintType;
import com.google.zxing.FormatException;
import com.google.zxing.MultiFormatReader;
import com.google.zxing.NotFoundException;
import com.google.zxing.RGBLuminanceSource;
import com.google.zxing.Reader;
import com.google.zxing.Result;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.QRCodeReader;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.lang.reflect.Field;
import java.nio.charset.Charset;
import java.util.Hashtable;

public class CaptureActivity extends Activity implements SurfaceHolder.Callback {
    private Context context;
    private Activity activity;
    private static final String TAG = CaptureActivity.class.getSimpleName();
    private TextView tvLight;
    private ToggleButton tbLight;
    private ImageView ivAlbum;
    private ImageView scanLine;
    private SurfaceView scanPreview = null;
    private RelativeLayout scanContainer;
    private RelativeLayout scanCropView;

    private static final int REQUEST_ALBUM = 0;
    private boolean isPause = false;
    private Camera camera;
    private CaptureActivityHandler handler;
    private Rect mCropRect = null;
    private CameraManager cameraManager;
    private InactivityTimer inactivityTimer;
    private BeepManager beepManager;
    private ObjectAnimator objectAnimator;
//    private TranslateAnimation translateAnimation;

    public Handler getHandler() {
        return handler;
    }

    public CameraManager getCameraManager() {
        return cameraManager;
    }

    private boolean isHasSurface = false;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        Window window = getWindow();
        window.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
        setContentView(R.layout.activity_capture);
        context = this;
        activity = this;

        findViewById(R.id.iv_back).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                finish();
            }
        });

        init();
        initScan();
    }

    private void init() {
        tvLight = (TextView) findViewById(R.id.tv_light);
        ivAlbum = (ImageView) findViewById(R.id.iv_album);
        tbLight = (ToggleButton) findViewById(R.id.tb_light);

        //闪光灯控制
        tbLight.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                if (isChecked) {
                    tvLight.setText("关灯");
                    openFlashlight();
                } else {
                    tvLight.setText("开灯");
                    closeFlashlight();
                }
            }
        });

        //打开相册
        findViewById(R.id.ll_album).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                getRuntimeRight();
            }
        });
    }

    /**
     * 扫码初始化
     */
    private void initScan() {
        scanPreview = (SurfaceView) findViewById(R.id.capture_preview);
        scanContainer = (RelativeLayout) findViewById(R.id.capture_container);
        scanCropView = (RelativeLayout) findViewById(R.id.capture_crop_view);
        scanLine = (ImageView) findViewById(R.id.scan_line);

        //扫描线动画1(属性动画可暂停)
        float curTranslationY = scanLine.getTranslationY();
        objectAnimator = ObjectAnimator.ofFloat(scanLine, "translationY", curTranslationY, dp2px(this, 170));
        objectAnimator.setDuration(4000);
        objectAnimator.setInterpolator(new LinearInterpolator());
        objectAnimator.setRepeatCount(ObjectAnimator.INFINITE);
        objectAnimator.setRepeatMode(ValueAnimator.RESTART);
    }

    @Override
    protected void onResume() {
        super.onResume();
        startScan();
    }

    @Override
    protected void onPause() {
        pauseScan();
        super.onPause();
    }

    @Override
    protected void onDestroy() {
        inactivityTimer.shutdown();
        if (objectAnimator != null) {
            objectAnimator.end();
        }
        super.onDestroy();
    }

    /**
     * 开始扫码
     */
    private void startScan() {
        inactivityTimer = new InactivityTimer(this);
        beepManager = new BeepManager(this);

//        扫描线动画2(补间动画)
//        translateAnimation = new TranslateAnimation(Animation.RELATIVE_TO_PARENT, 0.0f,
//                Animation.RELATIVE_TO_PARENT, 0.0f, Animation.RELATIVE_TO_PARENT, 0.0f, Animation.RELATIVE_TO_PARENT, 0.9f);
//        translateAnimation.setDuration(4500);
//        translateAnimation.setRepeatCount(-1);
//        translateAnimation.setRepeatMode(Animation.RESTART);
//        scanLine.startAnimation(translateAnimation);


        if (isPause) {
            objectAnimator.resume();
            isPause = false;
        } else {
            objectAnimator.start();
        }

        // CameraManager must be initialized here, not in onCreate(). This is necessary because we don't
        // want to open the camera driver and measure the screen size if we're going to show the help on
        // first launch. That led to bugs where the scanning rectangle was the wrong size and partially
        // off screen.
        cameraManager = new CameraManager(getApplication());
        handler = null;
        if (isHasSurface) {
            // The activity was paused but not stopped, so the surface still exists. Therefore
            // surfaceCreated() won't be called, so init the camera here.
            initCamera(scanPreview.getHolder());
        } else {
            // Install the callback and wait for surfaceCreated() to init the camera.
            scanPreview.getHolder().addCallback(this);
        }
        inactivityTimer.onResume();
    }

    /**
     * 暂停扫码
     */
    private void pauseScan() {
        if (handler != null) {
            handler.quitSynchronously();
            handler = null;
        }
        inactivityTimer.onPause();
        beepManager.close();
        cameraManager.closeDriver();
        if (!isHasSurface) {
            scanPreview.getHolder().removeCallback(this);
        }
        objectAnimator.pause();
//        translateAnimation.cancel();
        isPause = true;
    }

    @Override
    public void surfaceCreated(SurfaceHolder holder) {
        if (holder == null) {
            Log.e(TAG, "*** WARNING *** surfaceCreated() gave us a null surface!");
        }
        if (!isHasSurface) {
            isHasSurface = true;
            initCamera(holder);
        }
    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {
        isHasSurface = false;
    }

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

    }

    /**
     * 扫码成功回调方法
     * A valid barcode has been found, so give an indication of success and show
     * the results.
     *
     * @param rawResult The contents of the barcode.
     * @param bundle    The extras
     */
    public void handleDecode(Result rawResult, Bundle bundle) {
        inactivityTimer.onActivity();
        beepManager.playBeepSoundAndVibrate();

        //把扫码结果返回到MainActivity
        Intent intent = new Intent();
        intent.putExtra("barCode", rawResult.getText());
        setResult(RESULT_OK, intent);
        finish();

        //先暂停扫码，然后延时启动扫码
//        Toast.makeText(this, rawResult.getText(), Toast.LENGTH_LONG).show();
//        pauseScan();
//        new Handler().postDelayed(new Runnable() {
//            @Override
//            public void run() {
//                startScan();
//            }
//        }, 2000);
    }

    /**
     * 初始化相机
     *
     * @param surfaceHolder
     */
    private void initCamera(SurfaceHolder surfaceHolder) {
        if (surfaceHolder == null) {
            throw new IllegalStateException("No SurfaceHolder provided");
        }
        if (cameraManager.isOpen()) {
            Log.w(TAG, "initCamera() while already open -- late SurfaceView callback?");
            return;
        }
        try {
            cameraManager.openDriver(surfaceHolder);
            // Creating the handler starts the preview, which can also throw a RuntimeException.
            if (handler == null) {
                handler = new CaptureActivityHandler(this, cameraManager, DecodeThread.ALL_MODE);
            }

            initCrop();
        } catch (IOException ioe) {
            Log.w(TAG, ioe);
            displayFrameworkBugMessageAndExit();
        } catch (RuntimeException e) {
            // Barcode Scanner has seen crashes in the wild of this variety:
            // java.?lang.?RuntimeException: Fail to connect to camera service
            Log.w(TAG, "Unexpected error initializing camera", e);
            displayFrameworkBugMessageAndExit();
        }
    }

    /**
     * 相机打开出错弹框
     */
    private void displayFrameworkBugMessageAndExit() {
        // camera error
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setTitle(getString(R.string.app_name));
        builder.setMessage("相机打开出错，请稍后重试");
        builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {

            @Override
            public void onClick(DialogInterface dialog, int which) {
                finish();
            }

        });
        builder.setOnCancelListener(new DialogInterface.OnCancelListener() {

            @Override
            public void onCancel(DialogInterface dialog) {
                finish();
            }
        });
        builder.show();
    }

    public void restartPreviewAfterDelay(long delayMS) {
        if (handler != null) {
            handler.sendEmptyMessageDelayed(R.id.restart_preview, delayMS);
        }
    }

    public Rect getCropRect() {
        return mCropRect;
    }

    /**
     * 初始化截取的矩形区域
     */
    private void initCrop() {
        int cameraWidth = cameraManager.getCameraResolution().y;
        int cameraHeight = cameraManager.getCameraResolution().x;

        /** 获取布局中扫描框的位置信息 */
        int[] location = new int[2];
        scanCropView.getLocationInWindow(location);

        int cropLeft = location[0];
        int cropTop = location[1] - getStatusBarHeight();

        int cropWidth = scanCropView.getWidth();
        int cropHeight = scanCropView.getHeight();

        /** 获取布局容器的宽高 */
        int containerWidth = scanContainer.getWidth();
        int containerHeight = scanContainer.getHeight();

        /** 计算最终截取的矩形的左上角顶点x坐标 */
        int x = cropLeft * cameraWidth / containerWidth;
        /** 计算最终截取的矩形的左上角顶点y坐标 */
        int y = cropTop * cameraHeight / containerHeight;

        /** 计算最终截取的矩形的宽度 */
        int width = cropWidth * cameraWidth / containerWidth;
        /** 计算最终截取的矩形的高度 */
        int height = cropHeight * cameraHeight / containerHeight;

        /** 生成最终的截取的矩形 */
        mCropRect = new Rect(x, y, width + x, height + y);
    }

    /**
     * 获取状态栏高度
     *
     * @return
     */
    private int getStatusBarHeight() {
        try {
            Class<?> c = Class.forName("com.android.internal.R$dimen");
            Object obj = c.newInstance();
            Field field = c.getField("status_bar_height");
            int x = Integer.parseInt(field.get(obj).toString());
            return getResources().getDimensionPixelSize(x);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return 0;
    }

    /**
     * dp转px
     *
     * @param context 上下文
     * @param dpValue dp值
     * @return px值
     */
    public static float dp2px(Context context, float dpValue) {
        return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,
                dpValue, context.getResources().getDisplayMetrics());
    }

    /**
     * 相册二维码识别、闪光灯部分分界线
     ****************************************************************************************************/

    private static final int SELECT_PIC_KITKAT = 1001;
    private static final int SELECT_PIC = 1002;

    //打开闪光灯
    private void openFlashlight() {
        camera = cameraManager.getCamera();
        Camera.Parameters parameters = camera.getParameters();
        parameters.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);
        camera.setParameters(parameters);
        camera.startPreview();
    }

    //关闭闪光灯
    private void closeFlashlight() {
        Camera.Parameters parameters = camera.getParameters();
        parameters.setFlashMode(Camera.Parameters.FLASH_MODE_OFF);
        camera.setParameters(parameters);
        camera.startPreview();
    }

    /**
     * 获得运行时权限
     */
    private void getRuntimeRight() {
        if (ContextCompat.checkSelfPermission(context, Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions(activity, new String[]{Manifest.permission.READ_EXTERNAL_STORAGE}, 1);
        } else {
            openAlbum();
        }
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        switch (requestCode) {
            case 1:
                if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    openAlbum();
                } else {
                    Toast.makeText(context, "拒绝", Toast.LENGTH_LONG).show();
                }
            default:
                break;
        }
    }

    /**
     * 跳转到图片选择
     */
    public void openAlbum() {
        Intent intent = new Intent(Intent.ACTION_PICK);
        intent.setType("image/*");
        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.KITKAT) {
            startActivityForResult(intent, SELECT_PIC_KITKAT);
        } else {
            startActivityForResult(intent, SELECT_PIC);
        }
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == SELECT_PIC && resultCode == Activity.RESULT_OK) { //4.4以下图库
            Uri uri = data.getData();
            String path = getPath(context, uri);
            Result result = scanningImage(path);
            if (result == null) {
                Toast.makeText(context, "未发现二维码/条形码", Toast.LENGTH_LONG).show();
            } else {
                // 数据返回
                String recode = recode(result.toString());
                Toast.makeText(context, recode, Toast.LENGTH_LONG).show();
            }
        }

        //相册返回
        if (requestCode == SELECT_PIC_KITKAT && resultCode == Activity.RESULT_OK) { //4.4及以上图库
            Uri uri = data.getData();
            String path = getPath(context, uri);
            Result result = scanningImage(path);
            if (result == null) {
                Toast.makeText(context, "未发现二维码/条形码", Toast.LENGTH_LONG).show();
            } else {
                // 数据返回
                String recode = recode(result.toString());
                Toast.makeText(context, recode, Toast.LENGTH_LONG).show();
            }
        }
    }

    /**
     * 图片识别
     *
     * @param path
     * @return
     */
    protected Result scanningImage(String path) {
        if (TextUtils.isEmpty(path)) {
            return null;
        }
        // DecodeHintType 和EncodeHintType
        Hashtable<DecodeHintType, String> hints = new Hashtable<>();
        hints.put(DecodeHintType.CHARACTER_SET, "utf-8"); // 设置二维码内容的编码
        BitmapFactory.Options options = new BitmapFactory.Options();
//        options.inJustDecodeBounds = true; // 先获取原大小
        options.inJustDecodeBounds = false; // 获取新的大小
        int sampleSize = (int) (options.outHeight / (float) 200);
        if (sampleSize <= 0)
            sampleSize = 1;
        options.inSampleSize = sampleSize;
        Bitmap scanBitmap = BitmapFactory.decodeFile(path, options);
        int[] intArray = new int[scanBitmap.getWidth() * scanBitmap.getHeight()];
        scanBitmap.getPixels(intArray, 0, scanBitmap.getWidth(), 0, 0, scanBitmap.getWidth(), scanBitmap.getHeight());
        RGBLuminanceSource source = new RGBLuminanceSource(scanBitmap.getWidth(), scanBitmap.getHeight(), intArray);
        BinaryBitmap bitmap1 = new BinaryBitmap(new HybridBinarizer(source));
        Reader reader = new MultiFormatReader();
        try {
            return reader.decode(bitmap1, hints);
        } catch (NotFoundException e) {
            e.printStackTrace();
        } catch (ChecksumException e) {
            e.printStackTrace();
        } catch (FormatException e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 中文乱码处理
     *
     * @param str
     * @return
     */
    private String recode(String str) {
        String formart = "";
        try {
            boolean ISO = Charset.forName("ISO-8859-1").newEncoder().canEncode(str);
            if (ISO) {
                formart = new String(str.getBytes("ISO-8859-1"), "GB2312");
            } else {
                formart = str;
            }
        } catch (UnsupportedEncodingException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return formart;
    }

    /**
     * 得到图片路径
     *
     * @param context
     * @param uri
     * @return
     */
    public String getPath(final Context context, final Uri uri) {

        final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;

        // DocumentProvider
        if (isKitKat && DocumentsContract.isDocumentUri(context, uri)) {
            // ExternalStorageProvider
            if (isExternalStorageDocument(uri)) {
                final String docId = DocumentsContract.getDocumentId(uri);
                final String[] split = docId.split(":");
                final String type = split[0];

                if ("primary".equalsIgnoreCase(type)) {
                    return Environment.getExternalStorageDirectory() + "/" + split[1];
                }

                // TODO handle non-primary volumes
            }
            // DownloadsProvider
            else if (isDownloadsDocument(uri)) {

                final String id = DocumentsContract.getDocumentId(uri);
                final Uri contentUri = ContentUris.withAppendedId(
                        Uri.parse("content://downloads/public_downloads"), Long.valueOf(id));

                return getDataColumn(context, contentUri, null, null);
            }
            // MediaProvider
            else if (isMediaDocument(uri)) {
                final String docId = DocumentsContract.getDocumentId(uri);
                final String[] split = docId.split(":");
                final String type = split[0];

                Uri contentUri = null;
                if ("image".equals(type)) {
                    contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
                } else if ("video".equals(type)) {
                    contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
                } else if ("audio".equals(type)) {
                    contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
                }

                final String selection = "_id=?";
                final String[] selectionArgs = new String[]{
                        split[1]
                };

                return getDataColumn(context, contentUri, selection, selectionArgs);
            }
        }
        // MediaStore (and general)
        else if ("content".equalsIgnoreCase(uri.getScheme())) {

            // Return the remote address
            if (isGooglePhotosUri(uri))
                return uri.getLastPathSegment();

            return getDataColumn(context, uri, null, null);
        }
        // File
        else if ("file".equalsIgnoreCase(uri.getScheme())) {
            return uri.getPath();
        }

        return null;
    }

    /**
     * @param uri The Uri to check.
     * @return Whether the Uri authority is ExternalStorageProvider.
     */
    public static boolean isExternalStorageDocument(Uri uri) {
        return "com.android.externalstorage.documents".equals(uri.getAuthority());
    }

    /**
     * @param uri The Uri to check.
     * @return Whether the Uri authority is DownloadsProvider.
     */
    public static boolean isDownloadsDocument(Uri uri) {
        return "com.android.providers.downloads.documents".equals(uri.getAuthority());
    }

    /**
     * @param uri The Uri to check.
     * @return Whether the Uri authority is MediaProvider.
     */
    public static boolean isMediaDocument(Uri uri) {
        return "com.android.providers.media.documents".equals(uri.getAuthority());
    }

    /**
     * @param uri The Uri to check.
     * @return Whether the Uri authority is Google Photos.
     */
    public static boolean isGooglePhotosUri(Uri uri) {
        return "com.google.android.apps.photos.content".equals(uri.getAuthority());
    }

    /**
     * Get the value of the data column for this Uri. This is useful for
     * MediaStore Uris, and other file-based ContentProviders.
     *
     * @param context       The context.
     * @param uri           The Uri to query.
     * @param selection     (Optional) Filter used in the query.
     * @param selectionArgs (Optional) Selection arguments used in the query.
     * @return The value of the _data column, which is typically a file path.
     */
    public static String getDataColumn(Context context, Uri uri, String selection,
                                       String[] selectionArgs) {

        Cursor cursor = null;
        final String column = "_data";
        final String[] projection = {
                column
        };

        try {
            cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs,
                    null);
            if (cursor != null && cursor.moveToFirst()) {
                final int index = cursor.getColumnIndexOrThrow(column);
                return cursor.getString(index);
            }
        } finally {
            if (cursor != null)
                cursor.close();
        }
        return null;
    }
}

四.去除了ViewfinderView，使用XML布局，自定义扫码界面更灵活简单。

五.github:https://github.com/shenyuanqing/ZxingSimplify

六.参考：

https://github.com/zxing/zxing

https://github.com/chentao0707/ZXingProject

http://blog.youkuaiyun.com/aaawqqq/article/details/24880209