解决android4.4以上系统的相册选择图片后获取不到有效的URI...

最近用到上传图片发现，当选择相册里的照片时，会出现无效的URI，android4.4以上系统，选择相册中的最近照片，也会报同样的错误。

找到如下两个方法：

方法一：

 /**
     * 图片选择及拍照结果
     */
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {

        if (resultCode != RESULT_OK) {
            return;
        }
        Uri uri = null;
        switch (requestCode) {
            case PHOTOZOOM:// 相册
                if (data == null) {
                    return;
                }
                uri = data.getData();
                String[] proj = {MediaStore.Images.Media.DATA};
                Cursor cursor = managedQuery(uri, proj, null, null, null);
                int column_index = cursor
                       .getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
                cursor.moveToFirst();
                path = cursor.getString(column_index);// 图片在的路径
                Intent intent3 = new Intent(mContext, UserRectClipHead.class);
                intent3.putExtra("path", path);
                Log.i("选择图片路径",path+"");
                startActivityForResult(intent3, IMAGE_COMPLETE);
                break;
            case PHOTOTAKE:// 拍照
                path = photoSavePath + photoSaveName;
                uri = Uri.fromFile(new File(path));
                Intent intent2 = new Intent(mContext, UserRectClipHead.class);
                intent2.putExtra("path", path);
                startActivityForResult(intent2, IMAGE_COMPLETE);
                break;
            case IMAGE_COMPLETE:
                final String temppath = data.getStringExtra("path");
                Intent intent = new Intent();
                saveAllPath = FileUtils.saveBitmap(compressImage(BitmapUtils.UrlToBitmap(temppath)), ((int) (Math.random() * 10000)) + ".png");//质量压缩并存储得到path
                        intent.putExtra("path", saveAllPath);
//                intent.putExtra("path", temppath);
                setResult(0, intent);
                try {
                    cbuilder = new CustomDialogLoading.Builder(mContext, "上传中...");
                    mDialog = cbuilder.create();
                    mDialog.show();
                    postFile(saveAllPath);
                } catch (Exception e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                add_img.setImageBitmap(BitmapUtils.UrlToBitmap(temppath));
                break;
            default:
                break;
        }
        super.onActivityResult(requestCode, resultCode, data);
    }

发现有些手机获取不到图片的path，后来经查找发现是因为android4.4以上的手机相册中有个最近的照片，是获取不到path路径的，更改如下可以解决：

 /**
     * 图片选择及拍照结果
     */
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {

        if (resultCode != RESULT_OK) {
            return;
        }
        Uri uri = null;
        switch (requestCode) {
            case PHOTOZOOM:// 相册
                if (data == null) {
                    return;
                }
                uri = data.getData();
                //此处为了解决android4.4 相册选择时的 选择最近图片 获取不到path问题
                if(android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.KITKAT){//4.4及以上
                    String wholeID = DocumentsContract.getDocumentId(uri);
                    String id = wholeID.split(":")[1];
                    String[] column = { MediaStore.Images.Media.DATA };
                    String sel = MediaStore.Images.Media._ID + "=?";
                    Cursor cursor = this.getContentResolver().query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, column,
                            sel, new String[] { id }, null);
                    int columnIndex = cursor.getColumnIndex(column[0]);
                    if (cursor.moveToFirst()) {
                        path = cursor.getString(columnIndex);
                    }
                    cursor.close();
                }else{//4.4以下，即4.4以上获取路径的方法
                    String[] projection = { MediaStore.Images.Media.DATA };
                    Cursor cursor = this.getContentResolver().query(uri, projection, null, null, null);
                    int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
                    cursor.moveToFirst();
                    path = cursor.getString(column_index);
                }
//                }
                Intent intent3 = new Intent(mContext, UserRectClipHead.class);
                intent3.putExtra("path", path);
                Log.i("x选择图片",path+"");
                startActivityForResult(intent3, IMAGE_COMPLETE);
                break;
            case PHOTOTAKE:// 拍照
                path = photoSavePath + photoSaveName;
                uri = Uri.fromFile(new File(path));
                Intent intent2 = new Intent(mContext, UserRectClipHead.class);
                intent2.putExtra("path", path);
                startActivityForResult(intent2, IMAGE_COMPLETE);
                break;
            case IMAGE_COMPLETE:
                final String temppath = data.getStringExtra("path");
                Intent intent = new Intent();
                saveAllPath = FileUtils.saveBitmap(compressImage(BitmapUtils.UrlToBitmap(temppath)), ((int) (Math.random() * 10000)) + ".png");//质量压缩并存储得到path
                        intent.putExtra("path", saveAllPath);
//                intent.putExtra("path", temppath);
                setResult(0, intent);
                try {
                    cbuilder = new CustomDialogLoading.Builder(mContext, "上传中...");
                    mDialog = cbuilder.create();
                    mDialog.show();
                    postFile(saveAllPath);
                } catch (Exception e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                add_img.setImageBitmap(BitmapUtils.UrlToBitmap(temppath));
                break;
            default:
                break;
        }
        super.onActivityResult(requestCode, resultCode, data);
    }

方法二：

1. /** 
2.  * 根据Uri获取图片绝对路径，解决Android4.4以上版本Uri转换 
3.  * @param activity 
4.  * @param imageUri 
5.  * @author yaoxing 
6.  * @date 2014-10-12 
7.  */  
8. @TargetApi(19)  
9. public static String getImageAbsolutePath(Activity context, Uri imageUri) {  
10.     if (context == null || imageUri == null)  
11.         return null;  
12.     if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.KITKAT && DocumentsContract.isDocumentUri(context, imageUri)) {  
13.         if (isExternalStorageDocument(imageUri)) {  
14.             String docId = DocumentsContract.getDocumentId(imageUri);  
15.             String[] split = docId.split(":");  
16.             String type = split[0];  
17.             if ("primary".equalsIgnoreCase(type)) {  
18.                 return Environment.getExternalStorageDirectory() + "/" + split[1];  
19.             }  
20.         } else if (isDownloadsDocument(imageUri)) {  
21.             String id = DocumentsContract.getDocumentId(imageUri);  
22.             Uri contentUri = ContentUris.withAppendedId(Uri.parse("content://downloads/public_downloads"), Long.valueOf(id));  
23.             return getDataColumn(context, contentUri, null, null);  
24.         } else if (isMediaDocument(imageUri)) {  
25.             String docId = DocumentsContract.getDocumentId(imageUri);  
26.             String[] split = docId.split(":");  
27.             String type = split[0];  
28.             Uri contentUri = null;  
29.             if ("image".equals(type)) {  
30.                 contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;  
31.             } else if ("video".equals(type)) {  
32.                 contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;  
33.             } else if ("audio".equals(type)) {  
34.                 contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;  
35.             }  
36.             String selection = MediaStore.Images.Media._ID + "=?";  
37.             String[] selectionArgs = new String[] { split[1] };  
38.             return getDataColumn(context, contentUri, selection, selectionArgs);  
39.         }  
40.     } // MediaStore (and general)  
41.     else if ("content".equalsIgnoreCase(imageUri.getScheme())) {  
42.         // Return the remote address  
43.         if (isGooglePhotosUri(imageUri))  
44.             return imageUri.getLastPathSegment();  
45.         return getDataColumn(context, imageUri, null, null);  
46.     }  
47.     // File  
48.     else if ("file".equalsIgnoreCase(imageUri.getScheme())) {  
49.         return imageUri.getPath();  
50.     }  
51.     return null;  
52. }  
53.   
54. public static String getDataColumn(Context context, Uri uri, String selection, String[] selectionArgs) {  
55.     Cursor cursor = null;  
56.     String column = MediaStore.Images.Media.DATA;  
57.     String[] projection = { column };  
58.     try {  
59.         cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs, null);  
60.         if (cursor != null && cursor.moveToFirst()) {  
61.             int index = cursor.getColumnIndexOrThrow(column);  
62.             return cursor.getString(index);  
63.         }  
64.     } finally {  
65.         if (cursor != null)  
66.             cursor.close();  
67.     }  
68.     return null;  
69. }  
70.   
71. /** 
72.  * @param uri The Uri to check. 
73.  * @return Whether the Uri authority is ExternalStorageProvider. 
74.  */  
75. public static boolean isExternalStorageDocument(Uri uri) {  
76.     return "com.android.externalstorage.documents".equals(uri.getAuthority());  
77. }  
78.   
79. /** 
80.  * @param uri The Uri to check. 
81.  * @return Whether the Uri authority is DownloadsProvider. 
82.  */  
83. public static boolean isDownloadsDocument(Uri uri) {  
84.     return "com.android.providers.downloads.documents".equals(uri.getAuthority());  
85. }  
86.   
87. /** 
88.  * @param uri The Uri to check. 
89.  * @return Whether the Uri authority is MediaProvider. 
90.  */  
91. public static boolean isMediaDocument(Uri uri) {  
92.     return "com.android.providers.media.documents".equals(uri.getAuthority());  
93. }  
94.   
95. /** 
96.  * @param uri The Uri to check. 
97.  * @return Whether the Uri authority is Google Photos. 
98.  */  
99. public static boolean isGooglePhotosUri(Uri uri) {  
100.     return "com.google.android.apps.photos.content".equals(uri.getAuthority());  
101. }