Zxing图片识别 从相册选取二维码图片进行解析总结

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:

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Intent innerIntent = new Intent(); // "android.intent.action.GET_CONTENT"

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

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@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 };

// 获取选中图片的路径

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);

// String result = decode(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());

// Log.i("123result", result.getText());

// 数据返回

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 )

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String recode = recode(result.toString());

<5>这里我将result 通过setResult(); 返回给了 父Activity

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<6> Utils.getPath(getApplicationContext(), data.getData()); //将图片Uri 转换成绝对路径

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public class Utils {

public static final boolean isChineseCharacter(String chineseStr) {

char[] charArray = chineseStr.toCharArray();

for (int i = 0; i < charArray.length; i++) {

// 是否是Unicode编码,除了"�"这个字符.这个字符要另外处理

if ((charArray[i] >= '\u0000' && charArray[i] < '\uFFFD')

|| ((charArray[i] > '\uFFFD' && charArray[i] < '\uFFFF'))) {

continue;

} else {

return false;

}

}

return true;

}

/**

* 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;

// 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 getDataColumn(context, uri, null, null);

}

// File

else 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());

}

}

2) 解析二维码图片

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protected Result scanningImage(String path) {

if (TextUtils.isEmpty(path)) {

return null;

}

// DecodeHintType 和EncodeHintType

Hashtable<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);

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

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Result result = scanningImage(photo_path);

// String result = decode(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());

// Log.i("123result", result.getText());

// 数据返回

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:

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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 block

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:https://github.com/ManLikeTheWind/DemoZXing