Re: [android-developers] weird java.lang.StringIndexOutOfBoundsException error

[TreKing]

On Thu, Jun 16, 2016 at 4:33 PM, Aaron Shavolian 
wrote:

> The error only occurs when you press the button. Making the Program crash.


You're going outside the bounds of one of your strings. For example, trying
to access item at position 10 of the word "dog" is invalid.
Use your debugger and / or logging to determine which string is going out
of bounds then fix your logic.

-
TreKing  - Chicago
transit tracking app for Android-powered devices

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[android-developers] weird java.lang.StringIndexOutOfBoundsException error

[Aaron Shavolian]

Disclaimer: I'm a beginner straight out of AP Computer Science.

I'm trying to make an app that converts text input from the user into pig 
latin... For practice.

Here's my code: 

package com.example.ashavolian.piglatin2;

import android.content.DialogInterface;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.view.View.OnClickListener;

public class MainActivity extends AppCompatActivity {

TextView txtOut;
EditText txtIn;
Button button;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
txtOut = (TextView) findViewById(R.id.txtOut);
txtIn = (EditText) findViewById(R.id.txtIn);
button = (Button) findViewById(R.id.button);
button.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
String txtTxtIn = txtIn.getText().toString();
txtOut.setText(translate(txtTxtIn));
}
});

}
public String translate(String txtTxtIn)
{

int length = txtTxtIn.length();
String pigLatin = "";
for (int b = 0; b < length; b++) {
int space = txtTxtIn.indexOf(" ");
String word = txtTxtIn.substring(0, space);
int a = word.indexOf("a");
int e = word.indexOf("e");
int i = word.indexOf("i");
int o = word.indexOf("o");
int u = word.indexOf("u");

int vowels[] = {a, e, i, o, u};

for (int c = 0; c < 4; c++)
{
if (vowels[c] == -1)
vowels[c] += 101;
}

for (int d = 0; d < 4; d++)
{
if (vowels[d] > -1 && vowels[d] <= vowels[0] && vowels[d] <= 
vowels[1] && vowels[d] <= vowels[2] && vowels[d] <= vowels[3] && vowels[d] <= 
vowels[4])
{
word = word.substring(vowels[i] + 1) + 
word.substring(0,vowels[i]);
pigLatin += " " + word;
}
}

/*if (a != -1 && a < e && a < i && a < o && a < u) {
word = word.substring(a + 1) + word.substring(0, a);
pigLatin += " " + word;
} else if (e != -1 && e < a && e < i && e < o && e < u) {
word = word.substring(e + 1) + word.substring(0, e);
pigLatin += " " + word;
} else if (i != -1 && i < e && i < a && i < o && i < u) {
word = word.substring(i + 1) + word.substring(0, i);
pigLatin += " " + word;
} else if (o != -1 && o < e && o < i && o < a && o < u) {
word = word.substring(o + 1) + word.substring(0, o);
pigLatin += " " + word;
} else if (u != -1 && u < e && u < i && u < o && u < a) {
word = word.substring(u + 1) + word.substring(0, u);
pigLatin += " " + word;
}*/
txtTxtIn = txtTxtIn.substring(space + 1);
}
return pigLatin;

}
}

The error only occurs when you press the button. Making the Program crash.

Here's the error:


FATAL EXCEPTION: main

Process: com.example.ashavolian.piglatin2, PID: 2991

java.lang.StringIndexOutOfBoundsException: length=0; regionStart=0; 
regionLength=-1

at java.lang.String.startEndAndLength(String.java:298)

at java.lang.String.substring(String.java:1087)

at 
com.example.ashavolian.piglatin2.MainActivity.translate(MainActivity.java:39)

at 
com.example.ashavolian.piglatin2.MainActivity$1.onClick(MainActivity.java:27)

at android.view.View.performClick(View.java:5198)

at android.view.View$PerformClick.run(View.java:21147)

at android.os.Handler.handleCallback(Handler.java:739)

at android.os.Handler.dispatchMessage(Handler.java:95)

at android.os.Looper.loop(Looper.java:148)