T-Mobile G1 có một khe cắm thẻ microSD. Nhiều thiết bị khác Android có thể có các hình thức tương tự lưu trữ di động, mà nền tảng Android dùng để chỉ dẫn chung như là một thẻ SD | 326 CHAPTER 35 Development Tools Placing Calls and Messages If you want to simulate incoming calls or SMS messages to the Android emulator DDMS can handle that as well. On the Emulator Control tab above the Location Controls group is the Telephony Actions group as shown in Figure 35-13. Figure 35-13. DDMS telephony controls To simulate an incoming call fill in a phone number choose the Voice radio button and click Call. At that point the emulator will show the incoming call allowing you to accept it via the green phone button or reject it via the red phone button as shown in Figure 35-14. CHAPTER 35 Development Tools Figure 35-14. Simulated incoming call To simulate an incoming text message fill in a phone number choose the SMS radio button enter a message in the provided text area and click Send. The text message will then appear as a notification as shown in Figure 35-15. Figure 35-15. Simulated text message And of course you can click the notification to view the message in the full-fledged messaging application as shown in Figure 35-16. CHAPTER 35 Development Tools Figure 35-16. Simulated text message in messaging application Put It on My Card The T-Mobile G1 has a microSD card slot. Many other Android devices are likely to have similar forms of removable storage which the Android platform refers to generically as an SD card. It s strongly recommended that developers use SD cards as the holding pen for large data sets images movie clips audio files and so on. The T-Mobile G1 in particular has a relatively paltry amount of on-board flash memory so the more you can store on an SD card the better. Of course the challenge is that while the G1 has an SD card by default the emulator does not. To make the emulator work like the G1 you need to create and insert an SD card into the emulator. Creating a Card Image Rather than require emulators to somehow have access to an actual SD card reader and use actual SD cards Android is set up to use card images. A card image is
