ArrayAdapter throwing ArrayIndexOutOfBoundsException

Question

I am getting an ArrayOutOfBounds exception when I am using my custom array adapter.

I am wondering if there are any coding errors I have overlooked.

Here is the error log:

06-10 20:21:53.254: E/AndroidRuntime(315): FATAL EXCEPTION: main
06-10 20:21:53.254: E/AndroidRuntime(315): java.lang.RuntimeException: Unable to start activity ComponentInfo{alex.android.galaxy.tab.latest/alex.android.galaxy.tab.latest.Basic_db_output}: java.lang.ArrayIndexOutOfBoundsException
06-10 20:21:53.254: E/AndroidRuntime(315):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
06-10 20:21:53.254: E/AndroidRuntime(315):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
06-10 20:21:53.254: E/AndroidRuntime(315):  at android.app.ActivityThread.access$2300(ActivityThread.java:125)
06-10 20:21:53.254: E/AndroidRuntime(315):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
06-10 20:21:53.254: E/AndroidRuntime(315):  at android.os.Handler.dispatchMessage(Handler.java:99)
06-10 20:21:53.254: E/AndroidRuntime(315):  at android.os.Looper.loop(Looper.java:123)
06-10 20:21:53.254: E/AndroidRuntime(315):  at android.app.ActivityThread.main(ActivityThread.java:4627)
06-10 20:21:53.254: E/AndroidRuntime(315):  at java.lang.reflect.Method.invokeNative(Native Method)
06-10 20:21:53.254: E/AndroidRuntime(315):  at java.lang.reflect.Method.invoke(Method.java:521)
06-10 20:21:53.254: E/AndroidRuntime(315):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
06-10 20:21:53.254: E/AndroidRuntime(315):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
06-10 20:21:53.254: E/AndroidRuntime(315):  at dalvik.system.NativeStart.main(Native Method)
06-10 20:21:53.254: E/AndroidRuntime(315): Caused by: java.lang.ArrayIndexOutOfBoundsException
06-10 20:21:53.254: E/AndroidRuntime(315):  at alex.android.galaxy.tab.latest.Basic_db_output.onCreate(Basic_db_output.java:44)
06-10 20:21:53.254: E/AndroidRuntime(315):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
06-10 20:21:53.254: E/AndroidRuntime(315):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)

I am basing my code example on this: How to use ArrayAdapter<myClass>.

ArrayList<Question> list = new ArrayList<Question>();

for(int i=1; i <= 3; i++)
{       
    path = getAssets().open("quiz"+i+".txt");
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        Reader reader = new ResultsReader(path);
    reader.read();

    String str = ((ResultsReader)reader).getInput();
    String data[] = str.split("<.>");

    Question q = new Question();

    q.question = data[0];
    q.answer = Integer.parseInt(data[1]);
    q.choice1 = data[2];
    q.choice2 = data[3];
    q.choice3 = data[4];
    list.add(q);
}

But your error appears to be in your `Activity#onCreate(..)` implementation, as shown by `Basic_db_output.onCreate(Basic_db_output.java:44)`. — Jens, Jun 10 '12 at 20:53
That's what I see too. @alex, please post the Basic_db_output class so we can try and figure out what is going on. — Barak, Jun 10 '12 at 21:17
i think its something todo with the files not being read in. In java the exact same code seems to work perfectly — alex, Jun 10 '12 at 21:22

Blundell · Accepted Answer · 2012-06-10T22:07:24.417

1

When you do

 String data[] = str.split("<.>");

it is going to return you an array of uncertain length, unless you know the input is correct all the time you are going to run into issues when you do the below:

    q.question = data[0];
    q.answer = Integer.parseInt(data[1]);
    q.choice1 = data[2];
    q.choice2 = data[3];
    q.choice3 = data[4];

Perhaps you should think of another technique where you don't rely on calling explicit index's of your array.

For example:

if(data.length == 4){
        q.question = data[0];
        q.answer = Integer.parseInt(data[1]);
        q.choice1 = data[2];
        q.choice2 = data[3];
        q.choice3 = data[4];
} else {
   Log.e("YourApp", "Data was not split from file correctly");
}

or add some more debug before you use the split data array:

for(int i=0; i < data.length; i++){
   Log.d("YourApp", "DataReceived:"+data[i];
}

Edit

Oh yeah the issue will be the emulator / your phone hasn't got a clue what

C:/

is.

edited Jun 10 '12 at 22:07

answered Jun 10 '12 at 22:02

Blundell

75,855
30
208
233

if that is the case what path do i use as i am testing it on the emulator – alex Jun 10 '12 at 22:15
@alex you have a few choices, put it in the assets folder of your app, put it in /res/raw of your app, put it on the SD Card of your emulator – Blundell Jun 10 '12 at 22:18
one problem what path do i use i have updated my path in the question – alex Jun 10 '12 at 22:32
what is the path for the assets folder – alex Jun 10 '12 at 22:41
`getAssets().open("yourfile.txt");` – Blundell Jun 11 '12 at 06:58
hi is there anyway i can extract the path and convert it to a string one of my classes uses file instead of InputStream so i just want to pass the path – alex Jun 11 '12 at 07:21
@Alex please learn to use the search function. http://stackoverflow.com/questions/4820816/how-to-get-uri-from-an-asset-file – Blundell Jun 11 '12 at 07:27

ArrayAdapter throwing ArrayIndexOutOfBoundsException

1 Answers1