Base of Android program development-page value passing

Activity jump and value passing mainly connects multiple activities through the Intent class and transmits data through the Bundle class.

The sample code is as follows:

1.1 assign values using the intent. putExtra () method

1 public class menu extends Activity {

2

3 @ Override

4 public void onCreate (Bundle savedInstanceState ){

5 super. onCreate (savedInstanceState );

6

7 setContentView (R. layout. menu );

8

9...

10

11 // Button2

12 Button Btn2 = (Button) findViewById (R. id. button2 );

13

14 Btn2.setOnClickListener (new OnClickListener (){

15

16 @ Override

17 public void onClick (View arg0 ){

18

19 Intent intent = new Intent (menu. this, detail. class );

20 intent. putExtra ("flg", "list ");

21 startActivity (intent );

22}

23 });

24

25...

26

27

28}

1.2. Get the value on another page

1 Bundle bundle = this. getIntent (). getExtras ();

2 String flg = bundle. getString ("flg ");

3 if (flg. equals ("list ")){

4...

5}

2.1 If You Want To transmit a set of data, you must use the Bundle object to transmit data.

1 Bundle bundle = new Bundle ();

2

3 bundle. putString ("Name", "Jacker ");

4 bundle. putString ("Phone", "13590010101 ");

5 bundle. putBoolean ("flg", true );

6

7 intent. putExtras (bundle );

2.2 The same method is used to obtain the passed Value

1 Bundle bundle = this. getIntent (). getExtras ();

2

3 String name = bundle. getString ("Name ");

4 String phone = bundle. getString ("Phone ");

5 boolean flg = bundle. getBoolean ("flg ");