Random generation

[Kovacs Akos]

I would like to select IDs randomly from a string and then use setText function, but it is not working. :/
Please see the code below:

public String[] mezok = {"d1","d2","d3","d4","d5","d7","d8","d9","d10"};

Random rand = new Random();
int generalt = rand.nextInt();

mezok[generalt].setText("x");

[Steve Luke]

TellTheDetails. What does"not working" mean?

[Kovacs Akos]

Steve Luke wrote:TellTheDetails. What does"not working" mean?

ADT says: "The method setText(String) is undefined for the type String"

[Jamie Coleshill]

First thing is where are you declaring your String[] mezok? The second thing is that you can not do .setText("") on a string or array of Strings, you must use the = sign as follows because as the ADT say's "The method setText(String) is undefined for the type String".

String[] mezok = {"d1","d2","d3","d4","d5","d7","d8","d9","d10"};  
  
Random rand = new Random();  
int generalt = rand.nextInt();  
  
mezok[generalt] = "x";  

[Kovacs Akos]

Jamie Coleshill wrote:First thing is where are you declaring your String[] mezok? The second thing is that you can not do .setText("") on a string or array of Strings, you must use the = sign as follows because as the ADT say's "The method setText(String) is undefined for the type String".

String[] mezok = {"d1","d2","d3","d4","d5","d7","d8","d9","d10"};  
  
Random rand = new Random();  
int generalt = rand.nextInt();  
  
mezok[generalt] = "x";  

I have declared in onCreate. I would like to use this string as a textview id. How can I convert a string to a resource ID?

[Steve Luke]

Kovacs Akos wrote:I would like to use this string as a textview id. How can I convert a string to a resource ID?

You can't, the ids are all integers. You can sort of work around it by using reflection to load the .R class for your application and searching for the variable name with the same name and getting its value. But it is slow and complex, and fragile. I would suggest a different approach - perhaps a Map<String,Integer> that you pre-fill with the Strings you want to the ID it represents.

[Kovacs Akos]

I have found entries like this for all the variables: "0x7f090001" ...

[Steve Luke]

Looks about right... That being an integer represented in hex.

[doug mccann]

Kovacs Akos wrote:

public String[] mezok = {"d1","d2","d3","d4","d5","d7","d8","d9","d10"};

Random rand = new Random();
int generalt = rand.nextInt();

mezok[generalt].setText("x");

It look like you may need something like

generalt % mezok.length 

for your index as well as using =

[Kovacs Akos]

doug mccann wrote:

Kovacs Akos wrote:

public String[] mezok = {"d1","d2","d3","d4","d5","d7","d8","d9","d10"};

Random rand = new Random();
int generalt = rand.nextInt();

mezok[generalt].setText("x");

It look like you may need something like

generalt % mezok.length 

for your index as well as using =

It says:

"Multiple markers at this line
- Syntax error on token ";", delete this token
- Syntax error on token "%", invalid "

[doug mccann]

mezok[generallt%mezok.length] = "X"

[Kovacs Akos]

doug mccann wrote:

mezok[generallt%mezok.length] = "X"

Thanks, this code seems correct. Can you tell me please what is the essence of this solution or how is it working?

[doug mccann]

you need a number that is between 0 and the array size -1. "%" returns the remainder as in 7 % 5 -> 2