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Hi Davide, nice work...What you used to do the app in android?
From datasheet.. hope this help.."Interface selection is done automatically based on CSB (chip select) status. If CSB is connected to VDDIO, the I²C interface is active. If CSB is pulled down, the SPI interface is activated.The I²C 7-bit device address is 111011x. The 6 MSB bits are fixed. The last bit is changeable by SDO value and can be changed during operation. Connecting SDO to GND results in slave address 1110110 (0x76); connection it to VDDIO results in slave address 1110111 (0x77), which is the same as BMP180’s I²C address. The SDO pin cannot be left floating; if left floating, the I²C address will be undefined."