Array to string on Android

Question

I have a string array. I want to compare this string array with two string, so first i assigned array to variable then I compare this variable with strings.if array converted equals first string, do something else equals second, do something. But it raises cannot resolve method toString error.

String stopC = "stop";  //first strıng
String fastC = "fast";  //second strıng
String userC;   

switch (requestCode) {
    case REQ_CODE_SPEECH_INPUT: {
        if (resultCode == RESULT_OK && null != data) {
            /*strıng array*/            
            ArrayList<String> result = data.getStringArrayListExtra(RecognizerIntent.EXTRA_RESULTS);
            userC = Arrays.toString(result); //array convert to strıng.gıves error here.

            if(userC.compareTo(fastC)==0){   //compare coverted array wth strıng
                exam.speedUpBall();
                Toast.makeText(this, "fast!! =)",
                        Toast.LENGTH_LONG).show();
            }

           else if (userC.compareTo(stopC)==0) {  
                exam.stop();
                Toast.makeText(this, "stop!! =)",
                        Toast.LENGTH_LONG).show();
            }

        }
        break;
    }
}

The error could be caused by an illegal argument. The Docs for [`Arrays.toString()`](http://developer.android.com/reference/java/util/Arrays.html#toString(java.lang.Object[])) specify an `Object[]` argument, not `ArrayList`. Perhaps try `Arrays.toString(result.toArray())` ? — PPartisan, Dec 28 '15 at 18:33
@JarrodRoberson Since I'm maybe just stupid: can you please explain to me where you see the equality of "Object[] -> String" (OPs question) and "Object[] -> String[]" (duplicate)? — Tom, Dec 28 '15 at 22:30

score 3 · Answer 1 · edited Dec 28 '15 at 18:42

3

Arrays.toString()

method accepts arrays not List.

edited Dec 28 '15 at 18:42

Tom

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answered Dec 28 '15 at 18:31

Azat Nugusbayev

1,321
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problem was that, so thanks.ı converted to arraylıst to strıng now – busra o Dec 28 '15 at 18:50

score 1 · Answer 2 · answered Dec 28 '15 at 18:36

1

The toString() of Java Arrays has to be applied on Arrays, and not for ArrayList.

So convert ArrayList to Array, then convert Array to String.

Try this code-

userC = result.toArray().toString();

It will work as expected :)

answered Dec 28 '15 at 18:36

Manoj Kumar

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So you suggest to call `toString` on an array? You might want to give it a try, to see what you get. – Tom Dec 28 '15 at 18:41

score 1 · Answer 3 · edited Dec 28 '15 at 19:18

1

Another way to convert an ArrayList to String is by using TextUtils#join:

userC = TextUtils.join("\t", result);

edited Dec 28 '15 at 19:18

Tom

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answered Dec 28 '15 at 19:09

busra o

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Please avoid posting stuff like "thank you" in your answer. I edited your answer a bit, to improve the text. – Tom Dec 28 '15 at 19:19

score 0 · Answer 4 · edited May 23 '17 at 11:44

According to the Documentation,

toString(boolean[] a)
Returns a string representation of the contents of the specified array.

So the arguments should be only arrays e.g. char[], boolean[], int[] etc.
ArrayList is not an array.

If you want to convert an ArrayList to String, you should build it yourself. For example:

ArrayList<String> resultArrayList =  data.getStringArrayListExtra(RecognizerIntent.EXTRA_RESULTS);
String result = "";
for (String content: resultArrayList) {
    result += content;
}

Then you'll have a String that can be compared. Also, take a look at this topic here in SO

Best way to convert an ArrayList to a string

score -2 · Answer 5 · answered Dec 28 '15 at 18:36

-2

You need to first convert the List to array

ArrayList<String> result=new ArrayList<>();
String new_array=result.toArray().toString();

answered Dec 28 '15 at 18:36

Nishant Srivastava

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So you suggest to call `toString` on an array? You might want to give it a try, to see what you get. – Tom Dec 28 '15 at 18:41
thanks, found another way too, String userC = TextUtils.join("\t", result). İt easily converts arraylist to strıng – busra o Dec 28 '15 at 18:47
@busrao You might want to add this approach as another answer for this question. – Tom Dec 28 '15 at 18:55

Array to string on Android

5 Answers5