【Android】Uri和R资源相互转化

Uri转R：

  private static final int NAME_URI_PATH_SEGMENTS = 2;
  private static final int TYPE_PATH_SEGMENT_INDEX = 0;
  private static final int NAME_PATH_SEGMENT_INDEX = 1;
  // android.resource://<package_name>/<resource_id>
  private static final int ID_PATH_SEGMENTS = 1;
  private static final int RESOURCE_ID_SEGMENT_INDEX = 0;

 private int loadResourceIdFromUri(Uri source) {
    
    
   List<String> segments = source.getPathSegments();
   Integer result = null;
   if (segments.size() == NAME_URI_PATH_SEGMENTS) {
    
    
     String packageName = source.getAuthority();
     String typeName = segments.get(TYPE_PATH_SEGMENT_INDEX);
     String resourceName = segments.get(NAME_PATH_SEGMENT_INDEX);
     result = context.getResources().getIdentifier(resourceName, typeName, packageName);
   } else if (segments.size() == ID_PATH_SEGMENTS) {
    
    
     try {
    
    
       result = Integer.valueOf(segments.get(RESOURCE_ID_SEGMENT_INDEX));
     } catch (NumberFormatException e) {
    
    

     }
   }

   return result;
 }

R 转Uri

 private final Resources resources;

 private Uri getResourceUri(Integer model) {
    
    
   try {
    
    
     return Uri.parse(ContentResolver.SCHEME_ANDROID_RESOURCE + "://"
         + resources.getResourcePackageName(model) + '/'
         + resources.getResourceTypeName(model) + '/'
         + resources.getResourceEntryName(model));
   } catch (Resources.NotFoundException e) {
    
    
     return null;
   }
 }