The goal of this study was to development of android-based learning media to improve teachers' pedagogical aspects for Vocational High School Competence of Metal Casting. This study uses the Research and Development method to develop and measure the effectiveness of learning media to improve the pedagogical aspects of educators. Primary and secondary data were analyzed in this study. Primary data were gathered via questionnaires and in-depth interviews. Meanwhile, secondary data were gathered using the approach of a literature review. The respondents in this study were ten high school teachers who were chosen using a random purposive sample approach. The results showed that mobile learning can effectively help improve the pedagogical aspects of teachers.