In Android, what is the difference between intent and bundle in passing values?

/**

* Test the difference between using intent to pass a value directly in Android and using bundle to pass a value.
*
* You are welcome to ask questions.
* By garretly
* Mail garretly@gmail.com
*/

 

I went around EOE a while ago and saw someone asking me what is the difference between intent and bundle.

Since intent can pass the value, why do we still create a bundle to pass the value?

 

For example, I want to jump to interface B or interface C from interface.
In this case, I need to write two intents. If you want to transfer the value involved, your intent will write the method of adding the value twice. If I use one bundle to directly store the value first is it more concise to store it in intent?

Public Class A extends activity {
Private button BTN;
Private textview TV;
@ Override
Public void oncreate (bundle savedinstancestate ){
Super. oncreate (savedinstancestate );
Setcontentview (R. layout. );

BTN = (button) findviewbyid (R. Id. btn1 );
TV = (textview) findviewbyid (R. Id. TV1 );

TV. settext ("activity ---- ");

BTN. setonclicklistener (New View. onclicklistener (){

@ Override
Public void onclick (view v ){
Next ();

}
});

}
Private void next (){
Intent I = new intent ();
I. setclass (this, B. Class );
I. putextra ("int", 1000 );
I. putextra ("string", "test ");
I. putextra ("char", 'C ');
Startactivity (I );
Finish ();
}

}

 

Public Class B extends activity {
Private button BTN;
Private textview TV;

Int temp1;
String temp2;
Char temp3;

@ Override
Public void oncreate (bundle savedinstancestate ){
Super. oncreate (savedinstancestate );
Setcontentview (R. layout. B );

BTN = (button) findviewbyid (R. Id. btn2 );
TV = (textview) findviewbyid (R. Id. TV2 );

Geti (getintent ());

/**
* Why write view. onclicklistener () here ()
* Because onclicklistener () is called, multiple types of onclicklistener are available.
* () Object, so I will not use onclicklistener through the package here
* () Object. Instead, you can add a view before the object to inform the compiler of the onclicklistener () object I am calling.
*/
BTN. setonclicklistener (New View. onclicklistener (){

@ Override
Public void onclick (view v ){
Next ();

}
});

}

// Obtain data from
Private void Geti (intent I ){
// Int temp1 = I. getintextra ("int", 0 );
// String temp2 = I. getstringextra ("string ");
// Char temp3 = I. getcharextra ("char", 'A ');
Temp1 = I. getintextra ("int", 0 );
Temp2 = I. getstringextra ("string ");
Temp3 = I. getcharextra ("char", 'A ');
System. Out. println (temp1 );
System. Out. println (temp2 );
System. Out. println (temp3 );

TV. settext ("activity ---- B" + "/N" +
"Int =" + temp1 + "/N" +
"String =" + temp2 + "/N"
+ "Char ========" + temp3 );
}

/**
* To transfer the value from A to C, you need to change temp1 temp2 temp3 to a global variable and enter some attributes in B.
*/
Private void next (){
Intent I = new intent ();
I. setclass (this, C. Class );
I. putextra ("int", temp1 );
I. putextra ("string", temp2 );
I. putextra ("char", temp3 );
// At the same time, I want to pass some attributes of B to C
I. putextra ("Boolean", true );
Startactivity (I );
Finish ();
}

}

 

Public Class C extends activity {
Private button BTN;
Private textview TV;

Int temp1;
String temp2;
Char temp3;
@ Override
Public void oncreate (bundle savedinstancestate ){
Super. oncreate (savedinstancestate );
Setcontentview (R. layout. C );

BTN = (button) findviewbyid (R. Id. btn3 );
TV = (textview) findviewbyid (R. Id. TV3 );
// Getintent () is the intent object from which the activity is started.
Geti (getintent ());


BTN. setonclicklistener (New View. onclicklistener (){

@ Override
Public void onclick (view v ){
Next ();

}
});

}
// Obtain data from C
Private void Geti (intent I ){
// Int temp1 = I. getintextra ("int", 0 );
// String temp2 = I. getstringextra ("string ");
// Char temp3 = I. getcharextra ("char", 'A ');
Temp1 = I. getintextra ("int", 0 );
Temp2 = I. getstringextra ("string ");
Temp3 = I. getcharextra ("char", 'A ');
Boolean temp4 = I. getbooleanextra ("Boolean", false );
TV. settext ("activity ---- C" + "/N" +
"Int =" + temp1 + "/N" +
"String =" + temp2 + "/N" +
"Char =" + temp3 + "/N" +
"Boolean =" + temp4
);
}

Private void next (){
Intent I = new intent ();
I. setclass (this, Com. garretly. B. A. Class );
Startactivity (I );
Toast. maketext (getapplicationcontext (), "test bundle", Toast. length_long). Show ();
Finish ();
}

}

In another example, if I have activity A, B, C;
Now I want to pass the value through a through B to C
How do you say that if intent is used, the A-B first writes it again and then retrieves it in B, then inserts the value into intent, and then jumps to C tired?
If I use bundle in A, I will pass the bundle to B and then transfer it to C in B.
In this case, a new key-value can be added to the bundle object in B, which can also be obtained in C.

 

 

Public Class A extends activity {
/**
* In this class, we use bundle to transmit values.
*/
Private button BTN;
Private textview TV;
@ Override
Public void oncreate (bundle savedinstancestate ){
Super. oncreate (savedinstancestate );
Setcontentview (R. layout. );

BTN = (button) findviewbyid (R. Id. btn1 );
TV = (textview) findviewbyid (R. Id. TV1 );

TV. settext ("activity ---- ");

BTN. setonclicklistener (New View. onclicklistener (){

@ Override
Public void onclick (view v ){
Next ();

}
});

}
Private void next (){
Intent I = new intent ();
Bundle B = new bundle ();
I. setclass (this, B. Class );
B. putint ("int", 1000 );
B. putstring ("string", "test ");
B. putchar ("char", 'C ');
I. putextras (B );
Startactivity (I );
Finish ();
}

}

 

Public Class B extends activity {
Private button BTN;
Private textview TV;
Bundle B = new bundle ();
Int temp1;
String temp2;
Char temp3;

@ Override
Public void oncreate (bundle savedinstancestate ){
Super. oncreate (savedinstancestate );
Setcontentview (R. layout. B );

BTN = (button) findviewbyid (R. Id. btn2 );
TV = (textview) findviewbyid (R. Id. TV2 );

Geti (getintent ());

/**
* Why write view. onclicklistener () here ()
* Because onclicklistener () is called, multiple types of onclicklistener are available.
* () Object, so I will not use onclicklistener through the package here
* () Object. Instead, you can add a view before the object to inform the compiler of the onclicklistener () object I am calling.
*/
BTN. setonclicklistener (New View. onclicklistener (){

@ Override
Public void onclick (view v ){
Next ();

}
});

}

// Directly use bundle to obtain data from
Private void Geti (intent I ){
B = I. getextras ();
Temp1 = B. getint ("int", 0 );
Temp2 = B. getstring ("string ");
Temp3 = B. getchar ("char", 'A ');

TV. settext ("activity ---- B" + "/N" + "Int =" + temp1 + "/N" + "string ="
+ Temp2 + "/N" + "char ======" + temp3 );
}

/**
* To transfer the value from A to C, change temp1 temp2 temp3 to the global variable.
* You need to fill in some attributes in B.
*
* We will use bundle directly this time.
*/
Private void next (){
Intent I = new intent ();
I. setclass (this, C. Class );
B. putboolean ("Boolean", true );
I. putextras (B );
// Here, a test is to put B from a in intent for transmission.
I. putextra ("bundle", B );
Startactivity (I );
Finish ();
}

}

 

 

 

Public Class C extends activity {
Private button BTN;
Private textview TV;

Int temp1;
String temp2;
Char temp3;
@ Override
Public void oncreate (bundle savedinstancestate ){
Super. oncreate (savedinstancestate );
Setcontentview (R. layout. C );

BTN = (button) findviewbyid (R. Id. btn3 );
TV = (textview) findviewbyid (R. Id. TV3 );
// Getintent () is the intent object from which the activity is started.
Geti (getintent ());

BTN. settext ("End test ");
BTN. setonclicklistener (New View. onclicklistener (){

@ Override
Public void onclick (view v ){
Next ();

}
});

}
// Obtain data from C
Private void Geti (intent I ){
Bundle B = new bundle ();
B = I. getextras ();
Bundle b2 = I. getbundleextra ("bundle ");
Temp1 = B. getint ("int", 0 );
Temp2 = B. getstring ("string ");
Temp3 = B. getchar ("char", 'A ');
Boolean temp4 = B. getboolean ("Boolean", false );
TV. settext ("activity ---- C" + "/N" +
"Int =" + temp1 + "/N" +
"String =" + temp2 + "/N" +
"Char =" + temp3 + "/N" +
"Boolean =" + temp4 + "/N" +
"B2 =" + b2.tostring () // The data in B2 is no longer retrieved. What do you mean? But the size of the obtained data depends on the underlying code.
);
}

Private void next (){
Toast. maketext (this, "test ended", Toast. length_long). Show ();
Finish ();
}

}

 

 

 

 

Integration Project

Http://download.csdn.net/source/3152096