1, get today's date
New SimpleDateFormat ("Yyyy-mm-dd"= Sdf.format (new java.util.Date ());
2,string ext. int
Integer.valueof (str). Intvalue ()
3,int Turn string
String.valueof (Selectedtaskid)
4,toast Display
Toast.maketext (listcomplicatetaskactivity. this, "You already have 100 records, please delete some", Toast.length_long). Show ();
5, jump activity without parameters
StartActivity (new Intent (listcomplicatetaskactivity. this, listcomplicatetaskactivity. class));
6, with parameters jump activity
New Intent (); It.putextra ("Selectpos", 65535); It.setclass (listcomplicatetaskactivity. this, addtaskactivity. class this. getintent (); // get the intention to activate it position = Intent.getintextra ("Selectpos", 0);
7,sqlite Database Operations
//EnquiryCursor C = Db.rawquery ("SELECT * from task where TaskID =?"), NewString[] {position + "});
Insert
sql = "insert into task (Taskid,content,priority,istop,isdeadline,deadline, Updatedate) VALUES ("
+ taskno
+ ", '"
+ stredit
+ "',"
+ radioidx
+ ", '"
+ isontop
+ "', '"
+ isdealine
+ "', '"
+ Time + "', '" + updatedate + "')";
db.execsql (SQL);
//update
sql = "Update task Set istop = ' true ' where TaskID ="
+ Selectedtaskid + "";
Db.execsql (SQL);//Perform modifications
Delete
Db.delete ("task", "TaskID =?", new string[] {string.valueof (selectedtaskid)});
Common code for Android app development