3 ways to pass data between activity in Android

There is always a need to transfer data in Android development, especially between different activity. Here is a small description of the 3 kinds of activity you know about the jump way.

The first type: static data transfer

Directly on the upper part of the code: in the first activity

Intent Intent = new Intent ();

Intent.setclass (Mainactivity.this,secondactivity.class);

Secondactivity.usrname = "Jack";

secondactivity. Password = 123456;

StartActivity (Intent);

The Usrname and password are the 2 properties of secondactivity.

Second: Transfer data using intent

In the first activity

Intent Intent = new Intent (mainactivity.this,secondactivity.class);
Intent.putextra ("One", Integer.parseint (Et1.gettext (). toString ()));
Intent.putextra ("n", Integer.parseint (Et2.gettext (). toString ()));

StartActivity (Intent)

In a second activity

Intent Intent = Getintent ();

int a = Intent.getintextra ("One", 0);
int B = Intent.getintextra ("A", 0);

Third type: Intent to return results

In the first activity

Intent Intent = new Intent (mainactivity.this,secondactivity.class);
Intent.putextra ("One", Integer.parseint (Et1.gettext (). toString ()));
Intent.putextra ("n", Integer.parseint (Et2.gettext (). toString ()));
Startactivityforresult (Intent,requestcode);//indicates that data can be returned and jump

protected void Onactivityresult (int requestcode, int resultcode, Intent data) {

Super.onactivityresult (Requestcode, ResultCode, data);

if (ResultCode = = 2) {//2 is the returned data Peugeot

if (Requestcode = = Requestcode) {//Request data can be returned

int result = Data.getintextra ("three", 0);

Tv.settext (String.valueof (Data.getintextra ("three", 0));//Data returned

}} }

In a second activity

Intent Intent = new Intent ();
Intent.putextra ("three", c);
Setresult (2,intent);//2 means to pass from one sign to the first one
Finish ();//End Current Activity

The above is 3 of the activity between the transfer of data, if there is a new way please leave a message to guide the small, thank you very much!!!!!! 1

3 ways to pass data between activity in Android