从android相册获取所有图片的路径

在做从系统选择图片并获取到它们的路径时发现有些图片的uri.getScheme是“file”，有些图片的uri.getScheme是“content” 所有导致用uri.getPath并不能获取所有图片的路径，用如下代码解决：

@SuppressLint("NewApi")
public static String getPath(Activity activity, Uri uri) {
L.i("hui", "处理前的路径:" + uri);
if (null == uri) {
return null;
}
String path = null;
String scheme = uri.getScheme();
if (scheme == null) {
path = uri.getPath();
} else if (ContentResolver.SCHEME_FILE.equals(scheme)) {
path = uri.getPath();
} else if (ContentResolver.SCHEME_CONTENT.equals(scheme)) {
Cursor cursor = null;
if(VERSION.SDK_INT>=19&&DocumentsContract.isDocumentUri(activity, uri)){ //兼容andoid4.4版本
String wholeID = DocumentsContract.getDocumentId(uri);
String id = wholeID.split(":")[1];
String[] column = { MediaStore.Images.Media.DATA };
String sel = MediaStore.Images.Media._ID + "=?";
cursor = activity.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{
String[] projection = { MediaStore.Images.Media.DATA };
cursor = activity.getContentResolver().query(uri, projection, null, null, null);
int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
path = cursor.getString(column_index);
}
if(cursor!=null&&!cursor.isClosed()){
cursor.close();
}
}
return path;
}