Android实现识别相册二维码

总所周知，二维码非常普及，android当中我们一般做二维码扫一扫功能大部分用的是zxing库，但是zxing的库demo中没有实现本地相册二维码功能，小编今天拿出来说一下哈哈。

首先我们先导入zxing库，可在build的dependencies里添加 implementation ‘com.google.zxing:core:3.3.1’

             // 通过激活系统图库，选择一张图片Intent innerIntent = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);Intent wrapperIntent = Intent.createChooser(innerIntent, "选择二维码图片");startActivityForResult(wrapperIntent, IMAGE_CODE);

//我们可以通过这行几行代码进入系统相册选择一张图片然后在onActivityResult里获取数据

但是这里有个小的细节要注意一下：

我们要确保有存储权限之后，这个获取二维码的功能才能正常使用，所有我们应该这样写：

private final int IMAGE_CODE = 0;   //这里的IMAGE_CODE是自己任意定义的
/
//跳转相册
private void onJumpPictures(){PackageManager pm = getPackageManager();boolean permission = (PackageManager.PERMISSION_GRANTED == pm.checkPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE, getPackageName()));//判断有没有android.permission.WRITE_EXTERNAL_STORAGE权限if (permission) {//如果有权限则激活系统相册// 激活系统图库，选择一张图片Intent innerIntent = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);Intent wrapperIntent = Intent.createChooser(innerIntent, "选择二维码图片");startActivityForResult(wrapperIntent, IMAGE_CODE);return;}else {//请求存储权限displayFrameworkBugMessageAndExit();}}//打开权限申请框private void displayFrameworkBugMessageAndExit() {AlertDialog.Builder builder = new AlertDialog.Builder(this);builder.setTitle(getString(R.string.app_name));builder.setMessage("存储权限未开启");builder.setPositiveButton("我的"), new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {dialog.dismiss();showInstalledAppDetails(getApplicationContext(), getPackageName());}});builder.setOnCancelListener(new DialogInterface.OnCancelListener() {@Overridepublic void onCancel(DialogInterface dialog) {dialog.dismiss();}});builder.show();}/*** 调用系统InstalledAppDetails界面显示已安装应用程序的详细信息。* 对于Android 2.3（Api Level9）以上，使用SDK提供的接口； 2.3以下，使用非公开的接口（查看InstalledAppDetails源码）。** @param context* @param packageName 应用程序的包名*/public static void showInstalledAppDetails(Context context, String packageName) {Intent intent = new Intent();final int apiLevel = Build.VERSION.SDK_INT;if (apiLevel >= 9) { // 2.3（ApiLevel 9）以上，使用SDK提供的接口intent.setAction(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);Uri uri = Uri.fromParts(SCHEME, packageName, null);intent.setData(uri);} else { // 2.3以下，使用非公开的接口（查看InstalledAppDetails源码）// 2.2和2.1中，InstalledAppDetails使用的APP_PKG_NAME不同。final String appPkgName = (apiLevel == 8 ? APP_PKG_NAME_22: APP_PKG_NAME_21);intent.setAction(Intent.ACTION_VIEW);intent.setClassName(APP_DETAILS_PACKAGE_NAME,APP_DETAILS_CLASS_NAME);intent.putExtra(appPkgName, packageName);}intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);context.startActivity(intent);}//用户从相册选择图片之后的回调@Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data) {super.onActivityResult(requestCode, resultCode, data);if (resultCode != RESULT_OK) {        //此处的 RESULT_OK 是系统自定义得一个常量return;} else {//此处的用于判断接收的Activity是不是你想要的那个//这说明是用户点击了图片返回到的app界面if (requestCode == IMAGE_CODE) {Result result = null;try {String[] proj = {MediaStore.Images.Media.DATA};// 获取选中图片的路径//                外界的程序访问ContentProvider所提供数据 可以通过ContentResolver接口Cursor cursor = getContentResolver().query(data.getData(),proj, null, null, null);if (cursor.moveToFirst()) {int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);path = cursor.getString(column_index);if (path == null) {path = Utils.getPath(getApplicationContext(),data.getData());}}cursor.close();result = scanningImage(path);if (result == null) {Log.i(TAG,"未识别到二维码");} else {Log.i(TAG,"识别到的二维码" + result.toString());}} catch (Exception e) {Log.i(TAG,"报错信息");}}}}}// TODO: 解析部分图片protected Result scanningImage(String path) {Bitmap scanBitmap;if (TextUtils.isEmpty(path)) {return null;}// DecodeHintType 和EncodeHintTypeHashtable<DecodeHintType, String> hints = new Hashtable<DecodeHintType, String>();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scanBitmap = BitmapFactory.decodeFile(path, options);options.inJustDecodeBounds = false; // 获取新的大小int sampleSize = (int) (options.outHeight / (float) 200);if (sampleSize <= 0)sampleSize = 1;options.inSampleSize = sampleSize;scanBitmap = BitmapFactory.decodeFile(path, options);if (scanBitmap == null) {return null;}// --------------测试的解析方法---PlanarYUVLuminanceSource-这几行代码对project没作功----------LuminanceSource source1 = new PlanarYUVLuminanceSource(rgb2YUV(scanBitmap), scanBitmap.getWidth(),scanBitmap.getHeight(), 0, 0, scanBitmap.getWidth(),scanBitmap.getHeight());BinaryBitmap binaryBitmap = new BinaryBitmap(new HybridBinarizer(source1));MultiFormatReader reader1 = new MultiFormatReader();Result result1;try {result1 = reader1.decode(binaryBitmap);String content = result1.getText();Log.i("123content", content);} catch (NotFoundException e1) {// TODO Auto-generated catch blocke1.printStackTrace();}// ----------------------------RGBLuminanceSource source = new RGBLuminanceSource(scanBitmap);BinaryBitmap bitmap1 = new BinaryBitmap(new HybridBinarizer(source));QRCodeReader reader = new QRCodeReader();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* <p>* 暂时解决大部分的中文乱码 但是还有部分的乱码无法解决 .** @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");Log.i("1234      ISO8859-1", formart);} else {formart = str;Log.i("1234      stringExtra", str);}} catch (UnsupportedEncodingException e) {// TODO Auto-generated catch blocke.printStackTrace();}return formart;}/*** //TODO: TAOTAO 将bitmap由RGB转换为YUV //TOOD: 研究中** @param bitmap 转换的图形* @return YUV数据*/public byte[] rgb2YUV(Bitmap bitmap) {// 该方法来自QQ空间int width = bitmap.getWidth();int height = bitmap.getHeight();int[] pixels = new int[width * height];bitmap.getPixels(pixels, 0, width, 0, 0, width, height);int len = width * height;byte[] yuv = new byte[len * 3 / 2];int y, u, v;for (int i = 0; i < height; i++) {for (int j = 0; j < width; j++) {int rgb = pixels[i * width + j] & 0x00FFFFFF;int r = rgb & 0xFF;int g = (rgb >> 8) & 0xFF;int b = (rgb >> 16) & 0xFF;y = ((66 * r + 129 * g + 25 * b + 128) >> 8) + 16;u = ((-38 * r - 74 * g + 112 * b + 128) >> 8) + 128;v = ((112 * r - 94 * g - 18 * b + 128) >> 8) + 128;y = y < 16 ? 16 : (y > 255 ? 255 : y);u = u < 0 ? 0 : (u > 255 ? 255 : u);v = v < 0 ? 0 : (v > 255 ? 255 : v);yuv[i * width + j] = (byte) y;// yuv[len + (i >> 1) * width + (j & ~1) + 0] = (byte) u;// yuv[len + (i >> 1) * width + (j & ~1) + 1] = (byte) v;}}return yuv;}

Utils:

/*** Get a file path from a Uri. This will get the the path for Storage Access* Framework Documents, as well as the _data field for the MediaStore and* other file-based ContentProviders.* * @param context*            The context.* @param uri*            The Uri to query.* @author paulburke*/public static String getPath(final Context context, final Uri uri) {final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;// DocumentProviderif (isKitKat && DocumentsContract.isDocumentUri(context, uri)) {// ExternalStorageProviderif (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}// DownloadsProviderelse 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);}// MediaProviderelse 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 getDataColumn(context, uri, null, null);}// Fileelse if ("file".equalsIgnoreCase(uri.getScheme())) {return uri.getPath();}return null;}/*** 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 column_index = cursor.getColumnIndexOrThrow(column);return cursor.getString(column_index);}} finally {if (cursor != null)cursor.close();}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());}

基本上只用调用一下代码就ok了，没什么难度，只是有一个点注意一下，就是存储权限一定要开，有些手机默认就开启了，有些手机需要用户去点击，不然就会识别不出来！

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但是这里有个小的细节要注意一下：

Utils:

基本上只用调用一下代码就ok了，没什么难度，只是有一个点注意一下，就是存储权限一定要开，有些手机默认就开启了，有些手机需要用户去点击，不然就会识别不出来！

Android实现识别相册二维码相关推荐

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