CODEWITHSUNDEEP
androidstringconcatenationstring-concatenation
patrick
patrick

Reputation: 1292

How to concatenate strings and integer into a variable

It is a real silly questions but I can't get it to work. I've used the search option, but couldn't not find my answer for android.

What I would like to do it the following:

In res/strings.xml i've got several strings 

<string name="good0">blablabla</string>
<string name="good1">balablabla2</string>
etc

I want to show those strings randomly in a those when something happens:

Toast.makeText(this,R.string.good+(Math.random()*10), Toast.LENGTH_LONG).show();

But this doesn't work.

Thanks a lot for your help!

Upvotes: 2

Views: 6802

Answers (4)

Pir Fahim Shah
Pir Fahim Shah

Reputation: 10633

If you have multiple string values or integer values and you to store it in a single string then String Builder is the best for this type of operation, For Example you have a string array and you want to store in a single string and then display this string then use this method. it will work hundred percent and it is too much suitable for this type of problems.**

String my_str=null;
StringBuilder bldr=new StringBuilder();
for(int j=0;j<5;j++)
  bldr.append(phonearray[j]).append(",");
my_str=bldr.toString();

here in this case i am assigning phone array to a single string and then i will display it etc...

Upvotes: 0

Gabriel Negut
Gabriel Negut

Reputation: 13960

Use a String Array.

In strings.xml:

<resources>
    <string-array name="messages">
        <item>blablabla</item>
        <item>blablabla</item>
    </string-array>
</resources>

Then, in code you will have something like:

String[] messages = getResources().getStringArray(R.array.messages);
Random r = new Random();
String message = messages[r.nextInt(messages.length)];
Toast.makeText(this, message, Toast.LENGTH_LONG).show();

Upvotes: 4

Daniel A. White
Daniel A. White

Reputation: 191048

You can't do that.

You will have to use a switch block.

String myString;

switch(Math.random() * 10) {
   case 0:
       myString = getString(R.string.good1);
       break;
}

Toast.makeText(this, myString, Toast.LENGTH_LONG).show();

Upvotes: 2

Doug Stephen
Doug Stephen

Reputation: 7351

R.string.good is an int because it refers to a Resource. This int IDENTIFIES a string in an XML file. Android provides a getString() for its resource identifiers.

Android Docs on String Resources

You'll have to get the String out of the resource file this way, then concatenate as normal.

Upvotes: 2

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