What is getStringExtra format

Question

//intent.putExtra(EXTRA_MESSAGE, "abc");
intent.getStringExtra(Home.EXTRA_MESSAGE) == "abc" // false
intent.getStringExtra(Home.EXTRA_MESSAGE) == getString(R.string.abc) //false (with R.string.abc=="abc")

String abc = "abc";
intent.getStringExtra(Home.EXTRA_MESSAGE) == abc //false

Why everything is false? If I print the values with a toast they're apparently identical.

Thanks.

Why are you used `getStringExtra()` if you have `putExtra()` with String, rather than you can use `getString()` and directly company with `.equals("your string");` — Pratik Butani, Sep 13 '14 at 04:47

score 2 · Accepted Answer · answered Sep 13 '14 at 02:38

2

You compare the values of two java String's with .equals:

str1.equals(str)

In this context, == compares whether those two String's are the same objects, and they are not, thus evaluates to false.

answered Sep 13 '14 at 02:38

Peter Pei Guo

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score 1 · Answer 2 · answered Sep 13 '14 at 02:39

1

Well first and foremost, you can't compare strings with == ...

You need to be comparing two strings with string1.equals(string2)

Then you should get a "true" result.

hope this helps. Good luck :)

answered Sep 13 '14 at 02:39

Alex K

8,269
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score 0 · Answer 3 · answered Sep 13 '14 at 03:29

0

== compare whether both the string objects are same.(I.e address of object)

equals () method compare whether both the string objects have same value or not.

answered Sep 13 '14 at 03:29

Rustam

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score 0 · Answer 4 · edited Sep 13 '14 at 05:58

Try to understand this code and the results below to see the difference between == and equals(). Then you'll see why equals() is usually what you want for comparing strings.

String string1 = "android";
String string2 = "android";
String string3 = new String("android");

if(string1 == string2){
   System.out.print("String1 == String2");
}else{
   System.out.print("String1 != String2");
}

if(string1.equals(string2)){
   System.out.print("String1 equals String2");
}else{
   System.out.print("String1 not equals String2");
}

if(string1 == string3){
   System.out.print("String1 == String3");
}else{
   System.out.print("String1 != String3");
}

if(string1.equals(string3)){
   System.out.print("String1 equals String3");
}else{
   System.out.print("String1 not equals String3");
}

if(string2 == string3){
   System.out.print("String2 == String3");
}else{
   System.out.print("String2 != String3");
}

if(string2.equals(string3)){
   System.out.print("String2 equals String3");
}else{
   System.out.print("String2 not equals String3");
}

Result :

>> String1 == String2
>> String1 equals String2
>> String1 != String3
>> String1 equals String3
>> String2 != String3
>> String2 equals String3

score 0 · Answer 5 · answered Sep 13 '14 at 04:51

Try out equals() Instead == like:

//intent.putExtra(EXTRA_MESSAGE, "abc");
intent.getStringExtra(Home.EXTRA_MESSAGE).equals("abc");
intent.getStringExtra(Home.EXTRA_MESSAGE).equals(getString(R.string.abc));

String abc = "abc";
intent.getStringExtra(Home.EXTRA_MESSAGE).equals(abc);

Note: If you have set values using putExtra(key, String) then you can simply get values using intent.getString(key).

What is getStringExtra format

5 Answers5