Zxing图片识别 从相册选取二维码图片进行解析总结
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Zxing图片识别 从相册选取二维码图片进行解析总结
在Zxing扫描识别和图片识别的解析对象是相同的
本文分三个步骤:
1 获取相册的照片
2 解析二维码图片
3 返回结果
1) 获取相册照片
google对4.4的uri做了点改动 为了适配多种手机 需要做一个判断版本
在Activity中开启相册:
- Intent innerIntent = new Intent();
- if (Build.VERSION.SDK_INT < 19) {
- innerIntent.setAction(Intent.ACTION_GET_CONTENT);
- } else {
- // innerIntent.setAction(Intent.ACTION_OPEN_DOCUMENT); 这个方法报 图片地址 空指针;使用下面的方法
- innerIntent.setAction(Intent.ACTION_PICK);
- }
-
- innerIntent.setType("image/*");
-
- Intent wrapperIntent = Intent.createChooser(innerIntent, "选择二维码图片");
-
- CaptureActivity.this
- .startActivityForResult(wrapperIntent, REQUEST_CODE);
选中了照片后返回的数据在onActivityResult方法中获取
- @Override
- protected void onActivityResult(int requestCode, int resultCode, Intent data) {
-
- super.onActivityResult(requestCode, resultCode, data);
-
- if (resultCode == RESULT_OK) {
-
- switch (requestCode) {
-
- case REQUEST_CODE:
-
- String[] proj = { MediaStore.Images.Media.DATA };
-
- Cursor cursor = getContentResolver().query(data.getData(),
- proj, null, null, null);
-
- if (cursor.moveToFirst()) {
-
- int column_index = cursor
- .getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
- photo_path = cursor.getString(column_index);
- if (photo_path == null) {
- photo_path = Utils.getPath(getApplicationContext(),
- data.getData());
- Log.i("123path Utils", photo_path);
- }
- Log.i("123path", photo_path);
-
- }
-
- cursor.close();
-
- new Thread(new Runnable() {
-
- @Override
- public void run() {
-
- Result result = scanningImage(photo_path);
-
- if (result == null) {
- Looper.prepare();
- Toast.makeText(getApplicationContext(), "图片格式有误", 0)
- .show();
- Looper.loop();
- } else {
- Log.i("123result", result.toString());
-
-
- String recode = recode(result.toString());
- Intent data = new Intent();
- data.putExtra("result", recode);
- setResult(300, data);
- finish();
- }
- }
- }).start();
- break;
-
- }
-
- }
-
- }
上面这段代码
<1> 根据返回的照片信息 获取图片的路径photo_path
<2> 开启一个解析线程调用解析方法Result result = scanningImage(photo_path); 将photo_path传进去
<3> 对返回的解析的Result对象进行判断,获取字符串
<4> 调用recode对result数据进行中文乱码处理 ( 具体在步骤3中说明 )
- String recode = recode(result.toString());
<5>这里我将result 通过setResult(); 返回给了 父Activity
<6> Utils.getPath(getApplicationContext(), data.getData()); //将图片Uri 转换成绝对路径
- public class Utils {
-
- public static final boolean isChineseCharacter(String chineseStr) {
- char[] charArray = chineseStr.toCharArray();
- for (int i = 0; i < charArray.length; i++) {
-
- if ((charArray[i] >= '\u0000' && charArray[i] < '\uFFFD')
- || ((charArray[i] > '\uFFFD' && charArray[i] < '\uFFFF'))) {
- continue;
- } else {
- return false;
- }
- }
- return true;
- }
-
-
-
-
-
-
-
-
-
-
-
-
- public static String getPath(final Context context, final Uri uri) {
-
- final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;
-
-
- if (isKitKat && DocumentsContract.isDocumentUri(context, uri)) {
-
- 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];
- }
-
-
- }
-
- 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);
- }
-
- 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);
- }
- }
-
- else if ("content".equalsIgnoreCase(uri.getScheme())) {
- return getDataColumn(context, uri, null, null);
- }
-
- else if ("file".equalsIgnoreCase(uri.getScheme())) {
- return uri.getPath();
- }
-
- return null;
- }
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
- 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;
- }
-
-
-
-
-
-
- public static boolean isExternalStorageDocument(Uri uri) {
- return "com.android.externalstorage.documents".equals(uri
- .getAuthority());
- }
-
-
-
-
-
-
- public static boolean isDownloadsDocument(Uri uri) {
- return "com.android.providers.downloads.documents".equals(uri
- .getAuthority());
- }
-
-
-
-
-
-
- public static boolean isMediaDocument(Uri uri) {
- return "com.android.providers.media.documents".equals(uri
- .getAuthority());
- }
-
- }
2) 解析二维码图片
- protected Result scanningImage(String path) {
- if (TextUtils.isEmpty(path)) {
-
- return null;
-
- }
-
- Hashtable<DecodeHintType, String> hints = new Hashtable<DecodeHintType, String>();
- hints.put(DecodeHintType.CHARACTER_SET, "utf-8");
- BitmapFactory.Options options = new BitmapFactory.Options();
- options.inJustDecodeBounds = true;
- scanBitmap = BitmapFactory.decodeFile(path, options);
- options.inJustDecodeBounds = false;
-
- int sampleSize = (int) (options.outHeight / (float) 200);
-
- if (sampleSize <= 0)
- sampleSize = 1;
- options.inSampleSize = sampleSize;
- scanBitmap = BitmapFactory.decodeFile(path, options);
-
-
-
- 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;
-
- }
3) 返回结果
首先对result判断是否为空 ,如果为空就代表 二维码不标准或者不是二维码图片
在子线程中使用Toast 需要初始化looper
- Result result = scanningImage(photo_path);
-
- if (result == null) {
- Looper.prepare();
- Toast.makeText(getApplicationContext(), "图片格式有误", 0)
- .show();
- Looper.loop();
- } else {
- Log.i("123result", result.toString());
-
-
- String recode = recode(result.toString());
- Intent data = new Intent();
- data.putExtra("result", recode);
- setResult(300, data);
- finish();
- }
Result 对象返回的就是二维码扫描的结果
调用recode(result.toString) 方法进行中文乱码处理 代码如下:
- 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) {
-
- e.printStackTrace();
- }
- return formart;
- }
处理好之后将结果字符串 返回给父Activity
对于图片识别 有些事项需要注意..
二维码的图标需要保证图片尽量不倾斜 拍照的时候 最好保证手机与二维码 水平
附图:
希望对您有用 不足之处请指出 谢谢
资源下载地址:http://download.csdn.net/detail/aaawqqq/7281577
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