Intent (1, passing parameters)

Intent means "intention, purpose", as the information transmission medium between different components, mainly the following three:

• Activity:startactivity () and Startactivityforresult ();
• Service:startservice () and Bindservice ();
• Broadcast:sendbroadcast (), Sendoderedbroadcast () and Sendstickybroadcast ();

Intent transfer parameters in different component parts, mainly related to the following categories:

• Basic data, such as strings, integers, and so on, are as follows:

// Send Intent.putextra ("Key1", "value1"); Intent.putextra ("Key2", 2.0f); // Accept Intent Intent This  . getintent (); String value1  = Intent.getstringextra ("Key1"); float  value2   = Intent.getfloatextra ("Key2", 0);

• Using bundles
  • Integrating objects into the Serializable interface

 Public class Implements Serializable {//can also be parcelable, similar

• • Add bundles to the intent as follows:

// Send New Bundle ();                     New User (); User.setusername ("Fredric"); User.setpassword ("Sinny"); Bundle.putserializable ( "User", user); Intent.putextras (bundle);    // Receive  This  = Intent.getextras ();         = (user) bundle.get ("User");     

• Coercion type conversions, as in the following example:

//SendList<user> userlist =NewArraylist<user>(); for(inti = 0; I < 10; i++) {User tmp=NewUser (); Tmp.setusername ("Sinny"); Tmp.setpassword ("Fredric" +i);                    Userlist.add (TMP);} Intent.putextra ("UserList", (Serializable) userlist);//ReceiveList<user> userlist = (list<user>) Intent.getserializableextra ("UserList"); Iterator<User> iterator =Userlist.iterator ();  while(Iterator.hasnext ()) {User tmp=Iterator.next (); LOG.I (Tag_activity, Tmp.getusername ()+Tmp.getpassword ());}

Intent (1, passing parameters)