by Runtime.getruntime (). Exec calls programs or scripts under the underlying Linux

Android runtime makes it possible to directly invoke executable programs or scripts under the underlying Linux

For example, write a test tool in Linux, directly compiled after the APK in the runtime to invoke

or write a script that calls directly from the APK, eliminating the middle or jni

At least the efficiency should be higher.

Code:

[Java] view plaincopy

2. Public class Test extends Activity {

4. TextView text;

8. /** Called when the activity is first created. * /

10. @Override

12. Public void onCreate (Bundle savedinstancestate) {

14. Super. OnCreate (savedinstancestate);

16. Setcontentview (R.layout.main);

20. Text = (TextView) Findviewbyid (R.id.text);

24. Button Btn_ls = (button) Findviewbyid (R.id.btn_ls);

26. Btn_ls.setonclicklistener (new Onclicklistener () {

28. Public void OnClick (View v) {

30. Do_exec ("Ls/mnt/sdcard");

32. }

34. });

36. Button Btn_cat = (button) Findviewbyid (R.ID.BTN_CAT);

38. Btn_cat.setonclicklistener (new Onclicklistener () {

40. Public void OnClick (View v) {

42. Do_exec ("cat/proc/version");

44. }

46. });

48. Button Btn_rm = (button) Findviewbyid (R.ID.BTN_RM);

50. Btn_rm.setonclicklistener (new Onclicklistener () {

52. Public void OnClick (View v) {

54. Do_exec ("rm/mnt/sdcard/1.jpg");

56. }

58. });

60. Button Btn_sh = (button) Findviewbyid (R.ID.BTN_SH);

62. Btn_sh.setonclicklistener (new Onclicklistener () {

64. Public void OnClick (View v) {

66. Do_exec ("/system/bin/sh/mnt/sdcard/test.sh 123");

68. }

70. });

72. }

76. String do_exec (string cmd) {

78. String s = "/n";

80. Try {

82. Process p = runtime.getruntime (). exec (CMD);

84. BufferedReader in = new BufferedReader (

86. New InputStreamReader (P.getinputstream ()));

88. String line = null;

90. while (line = In.readline ()) = null) {

92. s + = line + "/n";

94. }

96. } catch (IOException e) {

98. //TODO auto-generated catch block

100. E.printstacktrace ();

102. }

104. Text.settext (s);

106. return cmd;

108. }

110. }

Test.sh:

Echo test.sh
echo $

Need to note:

1. exec does not equal the console command

2. exec's input/output stream needs to be handled by itself

3. Exec execution blocking, non-blocking, returning result problems

4. Attention to permissions issues

by Runtime.getruntime (). Exec calls programs or scripts under the underlying Linux