ABSTRACT
Covid-19 pandemic has forced online classes to be conducted mostly without proper introduction and preparation. This shift also made teachers and students gradually accustomed to independent learning. Several mobile applications have been developed for foreign language learning. However, only few Android applications were developed for non-linguistic courses offered by foreign language departments at the university level. The effectiveness of such an application to improve students' learning in universities, therefore, has not been conducted. This article reports the finding of a quasi-experimental research on the effect of using an Android application tailored for Research Method for Applied Linguistics students at an English department on their mastery of the course. The research data were collected through tests and a documentary study and calculated using ANCOVA statistical calculation. With the course mastery as the dependent variable, the use of Android application as the independent variable, and reading skills as covariates, the research revealed that the use of Android Learning Application significantly improves the EFL students' mastery of Research Methods for Applied Linguistics course. Further researchers are suggested to study the effect of the use of Android learning application on EFL students' mastery of a non-language course with significantly different students' levels of reading skills.