解决android4.4以上获取不到图片路径问题

 android4.4以上版本，拍照或选择图片后，获取不到图片的正确uri，此方法解决这个问题，经实践可以成功。

 /**  * 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();
                path= getImageAbsolutePath(this,uri);
                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();
                intent.putExtra("path", temppath);
                setResult(0, intent);
                try {
// cbuilder = new CustomDialogLoading.Builder(mContext, "上传中..."); // mDialog = cbuilder.create();  mDialog.show();
                    postFile(temppath);
                } catch (Exception e) {
                    // TODO Auto-generated catch block  e.printStackTrace();
                }
                add_img.setImageBitmap(BitmapUtils.UrlToBitmap(temppath));
                break;
            default:
                break;
        }
        super.onActivityResult(requestCode, resultCode, data);
    }
    /**  * 根据Uri获取图片绝对路径，解决Android4.4以上版本Uri转换  * @param  * @param imageUri  * @author yaoxing  * @date 2014-10-12  */  @TargetApi(19)
    public static String getImageAbsolutePath(Activity context, Uri imageUri) {
        if (context == null || imageUri == null)
            return null;
        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.KITKAT && DocumentsContract.isDocumentUri(context, imageUri)) {
            if (isExternalStorageDocument(imageUri)) {
                String docId = DocumentsContract.getDocumentId(imageUri);
                String[] split = docId.split(":");
                String type = split[0];
                if ("primary".equalsIgnoreCase(type)) {
                    return Environment.getExternalStorageDirectory() + "/" + split[1];
                }
            } else if (isDownloadsDocument(imageUri)) {
                String id = DocumentsContract.getDocumentId(imageUri);
                Uri contentUri = ContentUris.withAppendedId(Uri.parse("content://downloads/public_downloads"), Long.valueOf(id));
                return getDataColumn(context, contentUri, null, null);
            } else if (isMediaDocument(imageUri)) {
                String docId = DocumentsContract.getDocumentId(imageUri);
                String[] split = docId.split(":");
                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;
                }
                String selection = MediaStore.Images.Media._ID + "=?";
                String[] selectionArgs = new String[] { split[1] };
                return getDataColumn(context, contentUri, selection, selectionArgs);
            }
        } // MediaStore (and general)  else if ("content".equalsIgnoreCase(imageUri.getScheme())) {
            // Return the remote address  if (isGooglePhotosUri(imageUri))
                return imageUri.getLastPathSegment();
            return getDataColumn(context, imageUri, null, null);
        }
        // File  else if ("file".equalsIgnoreCase(imageUri.getScheme())) {
            return imageUri.getPath();
        }
        return null;
    }
    public static String getDataColumn(Context context, Uri uri, String selection, String[] selectionArgs) {
        Cursor cursor = null;
        String column = MediaStore.Images.Media.DATA;
        String[] projection = { column };
        try {
            cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs, null);
            if (cursor != null && cursor.moveToFirst()) {
                int index = cursor.getColumnIndexOrThrow(column);
                return cursor.getString(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());
    }

    /**  * @param uri The Uri to check.  * @return Whether the Uri authority is Google Photos.  */  public static boolean isGooglePhotosUri(Uri uri) {
        return "com.google.android.apps.photos.content".equals(uri.getAuthority());
    }