Java class inheritance

http://docs.oracle.com/javase/tutorial/java/IandI/subclasses.html

adb shell simulate touch screen click

Start button:
/dev/input/event8: 0003 0035 00000101
/dev/input/event8: 0003 0036 000000bc
/dev/input/event8: 0003 0030 00000028
/dev/input/event8: 0003 0032 00000006
/dev/input/event8: 0003 0039 00000000
/dev/input/event8: 0000 0002 00000000
/dev/input/event8: 0000 0000 00000000

Stop button:

/dev/input/event8: 0003 0035 00000104

/dev/input/event8: 0003 0036 000002af

/dev/input/event8: 0003 0030 00000028

/dev/input/event8: 0003 0032 00000006

/dev/input/event8: 0003 0039 00000000

/dev/input/event8: 0000 0002 00000000

/dev/input/event8: 0000 0000 00000000

click start button

./adb shell "sendevent /dev/input/event8 3 53 257;

           sendevent /dev/input/event8 3 54 188;

           sendevent /dev/input/event8 3 48 40;

           sendevent /dev/input/event8 3 50 6;

           sendevent /dev/input/event8 3 57 0;

           sendevent /dev/input/event8 0 2 0;

           sendevent /dev/input/event8 0 0 0;

           sendevent /dev/input/event8 1 330 1

   sendevent /dev/input/event8 0 0 0;

   sendevent /dev/input/event8 1 330 0;

   sendevent /dev/input/event8 0 0 0"

click stopbutton

./adb shell "sendevent /dev/input/event8 3 53 260;
           sendevent /dev/input/event8 3 54 687;
           sendevent /dev/input/event8 3 48 40;
           sendevent /dev/input/event8 3 50 6;
           sendevent /dev/input/event8 3 57 0;
           sendevent /dev/input/event8 0 2 0;
   sendevent /dev/input/event8 0 0 0;
   sendevent /dev/input/event8 1 330 1
   sendevent /dev/input/event8 0 0 0;
   sendevent /dev/input/event8 1 330 0;
   sendevent /dev/input/event8 0 0 0"

adb shell input keyevent

After entering adb shell environment, you can use "input keyevent" to simulate button clicks.

0 -->  "KEYCODE_UNKNOWN"
1 -->  "KEYCODE_MENU"
2 -->  "KEYCODE_SOFT_RIGHT"
3 -->  "KEYCODE_HOME"
4 -->  "KEYCODE_BACK"
5 -->  "KEYCODE_CALL"
6 -->  "KEYCODE_ENDCALL"
7 -->  "KEYCODE_0"
8 -->  "KEYCODE_1"
9 -->  "KEYCODE_2"
10 -->  "KEYCODE_3"
11 -->  "KEYCODE_4"
12 -->  "KEYCODE_5"
13 -->  "KEYCODE_6"
14 -->  "KEYCODE_7"
15 -->  "KEYCODE_8"
16 -->  "KEYCODE_9"
17 -->  "KEYCODE_STAR"
18 -->  "KEYCODE_POUND"
19 -->  "KEYCODE_DPAD_UP"
20 -->  "KEYCODE_DPAD_DOWN"
21 -->  "KEYCODE_DPAD_LEFT"
22 -->  "KEYCODE_DPAD_RIGHT"
23 -->  "KEYCODE_DPAD_CENTER"
24 -->  "KEYCODE_VOLUME_UP"
25 -->  "KEYCODE_VOLUME_DOWN"
26 -->  "KEYCODE_POWER"
27 -->  "KEYCODE_CAMERA"
28 -->  "KEYCODE_CLEAR"
29 -->  "KEYCODE_A"
30 -->  "KEYCODE_B"
31 -->  "KEYCODE_C"
32 -->  "KEYCODE_D"
33 -->  "KEYCODE_E"
34 -->  "KEYCODE_F"
35 -->  "KEYCODE_G"
36 -->  "KEYCODE_H"
37 -->  "KEYCODE_I"
38 -->  "KEYCODE_J"
39 -->  "KEYCODE_K"
40 -->  "KEYCODE_L"
41 -->  "KEYCODE_M"
42 -->  "KEYCODE_N"
43 -->  "KEYCODE_O"
44 -->  "KEYCODE_P"
45 -->  "KEYCODE_Q"
46 -->  "KEYCODE_R"
47 -->  "KEYCODE_S"
48 -->  "KEYCODE_T"
49 -->  "KEYCODE_U"
50 -->  "KEYCODE_V"
51 -->  "KEYCODE_W"
52 -->  "KEYCODE_X"
53 -->  "KEYCODE_Y"
54 -->  "KEYCODE_Z"
55 -->  "KEYCODE_COMMA"
56 -->  "KEYCODE_PERIOD"
57 -->  "KEYCODE_ALT_LEFT"
58 -->  "KEYCODE_ALT_RIGHT"
59 -->  "KEYCODE_SHIFT_LEFT"
60 -->  "KEYCODE_SHIFT_RIGHT"
61 -->  "KEYCODE_TAB"
62 -->  "KEYCODE_SPACE"
63 -->  "KEYCODE_SYM"
64 -->  "KEYCODE_EXPLORER"
65 -->  "KEYCODE_ENVELOPE"
66 -->  "KEYCODE_ENTER"
67 -->  "KEYCODE_DEL"
68 -->  "KEYCODE_GRAVE"
69 -->  "KEYCODE_MINUS"
70 -->  "KEYCODE_EQUALS"
71 -->  "KEYCODE_LEFT_BRACKET"
72 -->  "KEYCODE_RIGHT_BRACKET"
73 -->  "KEYCODE_BACKSLASH"
74 -->  "KEYCODE_SEMICOLON"
75 -->  "KEYCODE_APOSTROPHE"
76 -->  "KEYCODE_SLASH"
77 -->  "KEYCODE_AT"
78 -->  "KEYCODE_NUM"
79 -->  "KEYCODE_HEADSETHOOK"
80 -->  "KEYCODE_FOCUS"
81 -->  "KEYCODE_PLUS"
82 -->  "KEYCODE_MENU"
83 -->  "KEYCODE_NOTIFICATION"
84 -->  "KEYCODE_SEARCH"
85 -->  "TAG_LAST_KEYCODE"

adb shell quit app

You can use adb shell kill to kill the process, but first you need to find the process id. To do this you can use adb shell ps and parse the output. Here is a sample (assuming your development PC is Unix):

adb shell kill $(adb shell ps | grep YOUR.PACKAGE.NAME | awk '{ print $2 }')

Python: convert char to int

>>> ord('a')
97
>>> chr(97)
'a'
>>> chr(ord('a') + 3)
'd'
>>>

SAMSUNG Galaxy CPU uses LITTLE_ENDIAN by default

Convert bytes array to string

String str = new String(byte[] byteArray);