Zxing圖片識別 從相冊選取二維碼圖片進行解析總結

在Zxing掃描識別和圖片識別的解析對象是相同的

本文分三個步驟:

1 獲取相冊的照片

2 解析二維碼圖片

3 返回結果

 

1) 獲取相冊照片

google對4.4的uri做了點改動 為了適配多種手機 需要做一個判斷版本

在Activity中開啟相冊:

1. IntentinnerIntent=newIntent();//"android.intent.action.GET_CONTENT"
2. if(Build.VERSION.SDK_INT<19){
3. innerIntent.setAction(Intent.ACTION_GET_CONTENT);
4. }else{
5. // innerIntent.setAction(Intent.ACTION_OPEN_DOCUMENT); 這個方法報 圖片地址 空指針；使用下面的方法
6. innerIntent.setAction(Intent.ACTION_PICK);
7. }
8.  
9. innerIntent.setType("image/*");
10.  
11. IntentwrapperIntent=Intent.createChooser(innerIntent,"選擇二維碼圖片");
12.  
13. CaptureActivity.this
14. .startActivityForResult(wrapperIntent,REQUEST_CODE);

選中了照片後返回的數據在onActivityResult方法中獲取

1. @Override
2. protectedvoidonActivityResult(intrequestCode,intresultCode,Intentdata){
3.  
4. super.onActivityResult(requestCode,resultCode,data);
5.  
6. if(resultCode==RESULT_OK){
7.  
8. switch(requestCode){
9.  
10. caseREQUEST_CODE:
11.  
12. String[]proj={MediaStore.Images.Media.DATA};
13. //獲取選中圖片的路徑
14. Cursorcursor=getContentResolver().query(data.getData(),
15. proj,null,null,null);
16.  
17. if(cursor.moveToFirst()){
18.  
19. intcolumn_index=cursor
20. .getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
21. photo_path=cursor.getString(column_index);
22. if(photo_path==null){
23. photo_path=Utils.getPath(getApplicationContext(),
24. data.getData());
25. Log.i("123pathUtils",photo_path);
26. }
27. Log.i("123path",photo_path);
28.  
29. }
30.  
31. cursor.close();
32.  
33. newThread(newRunnable(){
34.  
35. @Override
36. publicvoidrun(){
37.  
38. Resultresult=scanningImage(photo_path);
39. //Stringresult=decode(photo_path);
40. if(result==null){
41. Looper.prepare();
42. Toast.makeText(getApplicationContext(),"圖片格式有誤",0)
43. .show();
44. Looper.loop();
45. }else{
46. Log.i("123result",result.toString());
47. //Log.i("123result",result.getText());
48. //數據返回
49. Stringrecode=recode(result.toString());
50. Intentdata=newIntent();
51. data.putExtra("result",recode);
52. setResult(300,data);
53. finish();
54. }
55. }
56. }).start();
57. break;
58.  
59. }
60.  
61. }
62.  
63. }

上面這段代碼

<1> 根據返回的照片信息 獲取圖片的路徑photo_path

<2> 開啟一個解析線程調用解析方法Result result = scanningImage(photo_path); 將photo_path傳進去

<3> 對返回的解析的Result對象進行判斷,獲取字符串

<4> 調用recode對result數據進行中文亂碼處理( 具體在步驟3中說明 )

1. Stringrecode=recode(result.toString());

<5>這裡我將result 通過setResult(); 返回給了 父Activity

<6> Utils.getPath(getApplicationContext(),data.getData()); //將圖片Uri 轉換成絕對路徑

1. publicclassUtils{
2.  
3. publicstaticfinalbooleanisChineseCharacter(StringchineseStr){
4. char[]charArray=chineseStr.toCharArray();
5. for(inti=0;i //是否是Unicode編碼,除了"?"這個字符.這個字符要另外處理
6. if((charArray[i]>='\u0000'&&charArray[i]<'\uFFFD')
7. ||((charArray[i]>'\uFFFD'&&charArray[i]<'\uFFFF'))){
8. continue;
9. }else{
10. returnfalse;
11. }
12. }
13. returntrue;
14. }
15.  
16. /**
17. *GetafilepathfromaUri.ThiswillgetthethepathforStorageAccess
18. *FrameworkDocuments,aswellasthe_datafieldfortheMediaStoreand
19. *otherfile-basedContentProviders.
20. *
21. *@paramcontext
22. *Thecontext.
23. *@paramuri
24. *TheUritoquery.
25. *@authorpaulburke
26. */
27. publicstaticStringgetPath(finalContextcontext,finalUriuri){
28.  
29. finalbooleanisKitKat=Build.VERSION.SDK_INT>=Build.VERSION_CODES.KITKAT;
30.  
31. //DocumentProvider
32. if(isKitKat&&DocumentsContract.isDocumentUri(context,uri)){
33. //ExternalStorageProvider
34. if(isExternalStorageDocument(uri)){
35. finalStringdocId=DocumentsContract.getDocumentId(uri);
36. finalString[]split=docId.split(":");
37. finalStringtype=split[0];
38.  
39. if("primary".equalsIgnoreCase(type)){
40. returnEnvironment.getExternalStorageDirectory()+"/"
41. +split[1];
42. }
43.  
44. //TODOhandlenon-primaryvolumes
45. }
46. //DownloadsProvider
47. elseif(isDownloadsDocument(uri)){
48.  
49. finalStringid=DocumentsContract.getDocumentId(uri);
50. finalUricontentUri=ContentUris.withAppendedId(
51. Uri.parse("content://downloads/public_downloads"),
52. Long.valueOf(id));
53.  
54. returngetDataColumn(context,contentUri,null,null);
55. }
56. //MediaProvider
57. elseif(isMediaDocument(uri)){
58. finalStringdocId=DocumentsContract.getDocumentId(uri);
59. finalString[]split=docId.split(":");
60. finalStringtype=split[0];
61.  
62. UricontentUri=null;
63. if("image".equals(type)){
64. contentUri=MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
65. }elseif("video".equals(type)){
66. contentUri=MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
67. }elseif("audio".equals(type)){
68. contentUri=MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
69. }
70.  
71. finalStringselection="_id=?";
72. finalString[]selectionArgs=newString[]{split[1]};
73.  
74. returngetDataColumn(context,contentUri,selection,
75. selectionArgs);
76. }
77. }
78. //MediaStore(andgeneral)
79. elseif("content".equalsIgnoreCase(uri.getScheme())){
80. returngetDataColumn(context,uri,null,null);
81. }
82. //File
83. elseif("file".equalsIgnoreCase(uri.getScheme())){
84. returnuri.getPath();
85. }
86.  
87. returnnull;
88. }
89.  
90. /**
91. *GetthevalueofthedatacolumnforthisUri.Thisisusefulfor
92. *MediaStoreUris,andotherfile-basedContentProviders.
93. *
94. *@paramcontext
95. *Thecontext.
96. *@paramuri
97. *TheUritoquery.
98. *@paramselection
99. *(Optional)Filterusedinthequery.
100. *@paramselectionArgs
101. *(Optional)Selectionargumentsusedinthequery.
102. *@returnThevalueofthe_datacolumn,whichistypicallyafilepath.
103. */
104. publicstaticStringgetDataColumn(Contextcontext,Uriuri,
105. Stringselection,String[]selectionArgs){
106.  
107. Cursorcursor=null;
108. finalStringcolumn="_data";
109. finalString[]projection={column};
110.  
111. try{
112. cursor=context.getContentResolver().query(uri,projection,
113. selection,selectionArgs,null);
114. if(cursor!=null&&cursor.moveToFirst()){
115. finalintcolumn_index=cursor.getColumnIndexOrThrow(column);
116. returncursor.getString(column_index);
117. }
118. }finally{
119. if(cursor!=null)
120. cursor.close();
121. }
122. returnnull;
123. }
124.  
125. /**
126. *@paramuri
127. *TheUritocheck.
128. *@returnWhethertheUriauthorityisExternalStorageProvider.
129. */
130. publicstaticbooleanisExternalStorageDocument(Uriuri){
131. return"com.android.externalstorage.documents".equals(uri
132. .getAuthority());
133. }
134.  
135. /**
136. *@paramuri
137. *TheUritocheck.
138. *@returnWhethertheUriauthorityisDownloadsProvider.
139. */
140. publicstaticbooleanisDownloadsDocument(Uriuri){
141. return"com.android.providers.downloads.documents".equals(uri
142. .getAuthority());
143. }
144.  
145. /**
146. *@paramuri
147. *TheUritocheck.
148. *@returnWhethertheUriauthorityisMediaProvider.
149. */
150. publicstaticbooleanisMediaDocument(Uriuri){
151. return"com.android.providers.media.documents".equals(uri
152. .getAuthority());
153. }
154.  
155. }

2) 解析二維碼圖片

1. protectedResultscanningImage(Stringpath){
2. if(TextUtils.isEmpty(path)){
3.  
4. returnnull;
5.  
6. }
7. //DecodeHintType和EncodeHintType
8. Hashtablehints=newHashtable();
9. hints.put(DecodeHintType.CHARACTER_SET,"utf-8");//設置二維碼內容的編碼
10. BitmapFactory.Optionsoptions=newBitmapFactory.Options();
11. options.inJustDecodeBounds=true;//先獲取原大小
12. scanBitmap=BitmapFactory.decodeFile(path,options);
13. options.inJustDecodeBounds=false;//獲取新的大小
14.  
15. intsampleSize=(int)(options.outHeight/(float)200);
16.  
17. if(sampleSize<=0)
18. sampleSize=1;
19. options.inSampleSize=sampleSize;
20. scanBitmap=BitmapFactory.decodeFile(path,options);
21.  
22.  
23.  
24. RGBLuminanceSourcesource=newRGBLuminanceSource(scanBitmap);
25. BinaryBitmapbitmap1=newBinaryBitmap(newHybridBinarizer(source));
26. QRCodeReaderreader=newQRCodeReader();
27. try{
28.  
29. returnreader.decode(bitmap1,hints);
30.  
31. }catch(NotFoundExceptione){
32.  
33. e.printStackTrace();
34.  
35. }catch(ChecksumExceptione){
36.  
37. e.printStackTrace();
38.  
39. }catch(FormatExceptione){
40.  
41. e.printStackTrace();
42.  
43. }
44.  
45. returnnull;
46. }

3) 返回結果

首先對result判斷是否為空 ,如果為空就代表 二維碼不標准或者不是二維碼圖片

在子線程中使用Toast 需要初始化looper

1. Resultresult=scanningImage(photo_path);
2. //Stringresult=decode(photo_path);
3. if(result==null){
4. Looper.prepare();
5. Toast.makeText(getApplicationContext(),"圖片格式有誤",0)
6. .show();
7. Looper.loop();
8. }else{
9. Log.i("123result",result.toString());
10. //Log.i("123result",result.getText());
11. //數據返回
12. Stringrecode=recode(result.toString());
13. Intentdata=newIntent();
14. data.putExtra("result",recode);
15. setResult(300,data);
16. finish();
17. }

 

Result 對象返回的就是二維碼掃描的結果

調用recode(result.toString) 方法進行中文亂碼處理 代碼如下:

1. privateStringrecode(Stringstr){
2. Stringformart="";
3.  
4. try{
5. booleanISO=Charset.forName("ISO-8859-1").newEncoder()
6. .canEncode(str);
7. if(ISO){
8. formart=newString(str.getBytes("ISO-8859-1"),"GB2312");
9. Log.i("1234ISO8859-1",formart);
10. }else{
11. formart=str;
12. Log.i("1234stringExtra",str);
13. }
14. }catch(UnsupportedEncodingExceptione){
15. //TODOAuto-generatedcatchblock
16. e.printStackTrace();
17. }
18. returnformart;
19. }

 

處理好之後將結果字符串 返回給父Activity

對於圖片識別有些事項需要注意..

二維碼的圖標需要保證圖片盡量不傾斜 拍照的時候 最好保證手機與二維碼 水平

附圖:

 

 

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