Android uses contentobserver to listen for database changes

Recently, a friend asked me how to receive text messages from a specified number, and asked me not to allow the system to intercept messages to users. It's a good time to look at tianchao group. A friend also asked this question and solved it through the contentobserver method. I will paste the code I implemented here for your reference.

You can listen to the contentprovider of the corresponding Uri, and implement what you want to do or broadcast in onchange.

[Java]
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1. Public class screentest extends activity {
2. Class smscontent extends contentobserver {
3. Private cursor = NULL;
4. Public smscontent (handler ){
5. Super (handler );
6. }
8. /**
9. * @ Description this method is called when the text message table is changed
10. * Two permissions are required.
11. * Android. Permission. read_sms reads text messages
12. * SMS writing for Android. Permission. write_sms
13. * @ Author snake
14. * @ Date 2010-1-12
15. */
16. @ Override
17. Public void onchange (Boolean selfchange ){
18. // Todo auto-generated method stub
19. Super. onchange (selfchange );
20. // Read the text message of the specified number in the inbox
21. Cursor = managedquery (URI. parse ("content: // SMS/inbox"), new string [] {"_ id", "Address", "read"}, "address =? And read =? ", New string [] {" 12345678901 "," 0 "}," date DESC ");
22. If (cursor! = NULL ){
23. Contentvalues values = new contentvalues ();
24. Values. Put ("read", "1"); // modify the text message to read mode.
25. Cursor. movetofirst ();
26. While (cursor. islast ()){
27. // Update the status of the currently unread SMS to read
28. Getcontentresolver (). Update (URI. parse ("content: // SMS/inbox"), values, "_ id =? ", New string [] {" "+ cursor. getint (0 )});
29. Cursor. movetonext ();
30. }
31. }
32. }
33. }
35. /** Called when the activity is first created .*/
36. @ Override
37. Public void oncreate (bundle savedinstancestate ){
38. Super. oncreate (savedinstancestate );
39. Setcontentview (R. layout. Main );
40. Smscontent content = new smscontent (new handler ());
41. // Register the SMS change listener
42. This. getcontentresolver (). registercontentobserver (URI. parse ("content: // SMS/"), true, content );
43. }
44. }