File Path to Android Content URI, credit to http://stackoverflow.com/a/11603841/1079757. Some modifications to use as an image and more polished this way. Took forever to find. Useful for working with the Android Gallery App

PathToContentURI.java

/**
 * Returns the Uri which can be used to delete/work with images in the photo gallery. 
 * @param filePath Path to IMAGE on SD card
 * @return Uri in the format of... content://media/external/images/media/[NUMBER]
 */
private Uri getUriFromPath(String filePath) {
    long photoId;
    Uri photoUri = MediaStore.Images.Media.getContentUri("external");

    String[] projection = {MediaStore.Images.ImageColumns._ID};
    // TODO This will break if we have no matching item in the MediaStore.
    Cursor cursor = getContentResolver().query(photoUri, projection, MediaStore.Images.ImageColumns.DATA + " LIKE ?", new String[] { filePath }, null);
    cursor.moveToFirst();

    int columnIndex = cursor.getColumnIndex(projection[0]);
    photoId = cursor.getLong(columnIndex);

    cursor.close();
    return Uri.parse(photoUri.toString() + "/" + photoId);
}

how to get the file path to content uri in ionic 3?

Try this. Tested Android P, PH-1

File f = new File(resource1.getResource());
                    
Uri contentUri = Uri.fromFile(f);