Code code code. So tired. Tutorial is really take time. | Hướng dẫn lập trình CO bẩn với Android Part 17 B4 Code code code. So tired. Tutorial is really take time. Chỉnh Mã package import import import import import import import import public class Example extends Activity Button button1 button2 button3 Button button4 button5 button6 Button button7 button8 button9 Button button0 buttonStar buttonClear TextView numberView Called when the activity is first created. @Override public void onCreate Bundle savedInstanceState savedInstanceState setContentView numberView TextView findViewById button1 Button findViewById button2 Button findViewById button3 Button findViewById button4 Button button5 Button button6 Button findViewById findViewById findViewById button7 Button button8 Button button9 Button findViewById findViewById findViewById button0 Button findViewById buttonstar Button findViewById buttonClear Button findViewById 1 2 3 4 5 6 7 8 9 0 buttonClear Button findViewById new OnClickListener public void onClick View v public OnClickListener appendString final .