ImmediateUpdate.java

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_immediate_update);
        UpdateManager.Builder builder = new UpdateManager.Builder()
                        .setActivity(this)
                        .setUpdateType(UpdateType.FLEXIBLE);
        final UpdateManager updateManager = builder.create();
        updateManager.setUpdateListener(new UpdateListener() {
            @Override
            public void onUpdateChecked(@NotNull AppUpdateInfo appUpdateInfo, boolean updateAvailable) {
                if (updateAvailable){
                    updateManager.update(appUpdateInfo);
                }

            }
            @Override
            public void onUpdateCheckFailure(@Nullable Exception exception) {
                if (exception!=null){
                    Toast.makeText(FlexibleUpdateActivity.this, "error : " +  exception.getMessage(), Toast.LENGTH_SHORT).show();
                }
            }
            @Override
            public void onUpdateState(@NotNull InstallState installState, long bytesDownLoaded, long totalBytesToDownLoaded) {
                if (installState.installStatus()== InstallStatus.DOWNLOADED){
                    //업데이트 완료
                }
            }
        });
        updateManager.checkUpdate();
    
    }


    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == UpdateManager.UPDATE_REQ_CODE) {
            switch (resultCode) {
                case RESULT_OK:
                    //업데이트 완료
                    break;
                case RESULT_CANCELED:
                    //업데이트 취소
                    break;
                default:
                    //업데이트 실패
                    break;
            }
        }
    }