Android 应用中的索引自动边界错误
我不知道如何修复我遇到的错误。我的logcat输出如下所示，正如人们所要求的，我还包括了Android 应用中的索引自动边界错误,android,exception,indexoutofboundsexception,Android,Exception,Indexoutofboundsexception,我不知道如何修复我遇到的错误。我的logcat输出如下所示，正如人们所要求的，我还包括了Playing.class 日志： 02-11 23:23:41.212: E/AndroidRuntime(2416): FATAL EXCEPTION: main 02-11 23:23:41.212: E/AndroidRuntime(2416): java.lang.IndexOutOfBoundsException: Invalid index 50, size is 50 02-11 23:
Playing.class 02-11 23:23:41.212: E/AndroidRuntime(2416): FATAL EXCEPTION: main
02-11 23:23:41.212: E/AndroidRuntime(2416): java.lang.IndexOutOfBoundsException: Invalid index 50, size is 50
02-11 23:23:41.212: E/AndroidRuntime(2416): at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:257)
02-11 23:23:41.212: E/AndroidRuntime(2416): at java.util.ArrayList.remove(ArrayList.java:406)
02-11 23:23:41.212: E/AndroidRuntime(2416): at com.ithinkdictionary.Playing.question(Playing.java:449)
02-11 23:23:41.212: E/AndroidRuntime(2416): at com.ithinkdictionary.Playing.access$3(Playing.java:428)
02-11 23:23:41.212: E/AndroidRuntime(2416): at com.ithinkdictionary.Playing$13.onClick(Playing.java:1459)
02-11 23:23:41.212: E/AndroidRuntime(2416): at com.android.internal.app.AlertController$ButtonHandler.handleMessage(AlertController.java:159)
02-11 23:23:41.212: E/AndroidRuntime(2416): at android.os.Handler.dispatchMessage(Handler.java:99)
02-11 23:23:41.212: E/AndroidRuntime(2416): at android.os.Looper.loop(Looper.java:123)
02-11 23:23:41.212: E/AndroidRuntime(2416): at android.app.ActivityThread.main(ActivityThread.java:3683)
02-11 23:23:41.212: E/AndroidRuntime(2416): at java.lang.reflect.Method.invokeNative(Native Method)
02-11 23:23:41.212: E/AndroidRuntime(2416): at java.lang.reflect.Method.invoke(Method.java:507)
02-11 23:23:41.212: E/AndroidRuntime(2416): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
02-11 23:23:41.212: E/AndroidRuntime(2416): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
02-11 23:23:41.212: E/AndroidRuntime(2416): at dalvik.system.NativeStart.main(Native Method)
public class Playing extends Activity {
public void onClick(View v) {
if (level <21){
twist.startAnimation(anim2);
firstbutton.startAnimation(anim);
secondbutton.startAnimation(anim);
thirdbutton.startAnimation(anim);
fourthbutton.startAnimation(anim);
twis.start();
ArrayList<String> ar= new ArrayList<String>();
String[] twist = {b,c,d,e};
Random rand = new Random();
for (String i : twist) {
ar.add(i);
}
for (int z = 0; z < 4; z++){
int select = rand.nextInt(ar.size());
String random = ar.get(select);
ar.remove(select);
if(z==0){
firstbutton.setText(random);firstholder = random; }
if (z==1){
secondbutton.setText(random);secondholder = random; }
if (z==2){
thirdbutton.setText(random);thirdholder = random; }
if (z==3){
fourthbutton.setText(random);fourthholder = random; }}
}else if( level < 61){
twist.startAnimation(anim2);
firstbutton.startAnimation(anim);
secondbutton.startAnimation(anim);
thirdbutton.startAnimation(anim);
fourthbutton.startAnimation(anim);
fifthbutton.startAnimation(anim);
sixthbutton.startAnimation(anim);
twis.start();
ArrayList<String> ar= new ArrayList<String>();
String[] twist = {b,c,d,e,f,g};
Random rand = new Random();
for (String i : twist) {
ar.add(i);
}
for (int z = 0; z < 6; z++){
int select = rand.nextInt(ar.size());
String random = ar.get(select);
ar.remove(select);
if(z==0){
firstbutton.setText(random);firstholder = random; }
if (z==1){
secondbutton.setText(random);secondholder = random; }
if (z==2){
thirdbutton.setText(random);thirdholder = random; }
if (z==3){
fourthbutton.setText(random);fourthholder = random; }
if (z==4){
fifthbutton.setText(random);fifthholder = random; }
if (z==5){
sixthbutton.setText(random);sixthholder = random; }}
}else if( level < 81){
twist.startAnimation(anim2);
firstbutton.startAnimation(anim);
secondbutton.startAnimation(anim);
thirdbutton.startAnimation(anim);
fourthbutton.startAnimation(anim);
fifthbutton.startAnimation(anim);
sixthbutton.startAnimation(anim);
seventhbutton.startAnimation(anim);
twis.start();
ArrayList<String> ar= new ArrayList<String>();
String[] twist = {b,c,d,e,f,g,h};
Random rand = new Random();
for (String i : twist) {
ar.add(i);
}
for (int z = 0; z < 7; z++){
int select = rand.nextInt(ar.size());
String random = ar.get(select);
ar.remove(select);
if(z==0){
firstbutton.setText(random);firstholder = random; }
if (z==1){
secondbutton.setText(random);secondholder = random; }
if (z==2){
thirdbutton.setText(random);thirdholder = random; }
if (z==3){
fourthbutton.setText(random);fourthholder = random; }
if (z==4){
fifthbutton.setText(random);fifthholder = random; }
if (z==5){
sixthbutton.setText(random);sixthholder = random; }
if (z==6){
seventhbutton.setText(random);seventhholder = random; }}
}else {
twist.startAnimation(anim2);
firstbutton.startAnimation(anim);
secondbutton.startAnimation(anim);
thirdbutton.startAnimation(anim);
fourthbutton.startAnimation(anim);
fifthbutton.startAnimation(anim);
sixthbutton.startAnimation(anim);
seventhbutton.startAnimation(anim);
eightthbutton.startAnimation(anim);
twis.start();
ArrayList<String> ar= new ArrayList<String>();
String[] twist = {b,c,d,e,f,g,h,i};
Random rand = new Random();
for (String i : twist) {
ar.add(i);
}
for (int z = 0; z < 8; z++){
int select = rand.nextInt(ar.size());
String random = ar.get(select);
ar.remove(select);
if(z==0){
firstbutton.setText(random);firstholder = random; }
if (z==1){
secondbutton.setText(random);secondholder = random; }
if (z==2){
thirdbutton.setText(random);thirdholder = random; }
if (z==3){
fourthbutton.setText(random);fourthholder = random; }
if (z==4){
fifthbutton.setText(random);fifthholder = random; }
if (z==5){
sixthbutton.setText(random);sixthholder = random; }
if (z==6){
seventhbutton.setText(random);seventhholder = random; }
if (z==7){
eightthbutton.setText(random);eightthholder = random; }}
}
}
});
}
private void question() {
InputStreamReader inputStream = new InputStreamReader
(getResources().openRawResource(R.raw.question1));
BufferedReader br = new BufferedReader(inputStream);
ArrayList<Integer> ar= new ArrayList<Integer>();
int[] number= {1,2,3,4,5,6,7,8,9,10,
11,12,13,14,15,16,17,18,19,20,
21,22,23,24,25,26,27,28,29,30,
31,32,33,34,35,36,37,38,39,40,
41,42,43,44,45,46,47,48,49,50};
for (int i : number) {
ar.add(i);}
Random r = new Random();
int select = r.nextInt(ar.size());
int random = ar.get(select);
ar.remove(random);
String theLine="";
int lineCtr = 0;
try {
while ((theLine = br.readLine()) != null) {
if (lineCtr == select) {
StringTokenizer st = new StringTokenizer(theLine,";");
while(st.hasMoreTokens())
{
//reading and getting data from the database","
a = st.nextToken();
b = st.nextToken();
c = st.nextToken();
d = st.nextToken();
e = st.nextToken();
f = st.nextToken();
//button setText
question.setText(a);
ca.setText(f);
ArrayList<String> as= new ArrayList<String>();
String[] twist = {b,c,d,e};
Random rand = new Random();
for (String i : twist) {
as.add(i);
}
for (int z = 0; z < 4; z++){
int sel = rand.nextInt(as.size());
String randoms = as.get(sel);
as.remove(sel);
if(z==0){
firstbutton.setText(randoms);firstholder = randoms; }
if (z==1){
secondbutton.setText(randoms);secondholder = randoms; }
if (z==2){
thirdbutton.setText(randoms);thirdholder = randoms; }
if (z==3){
fourthbutton.setText(randoms);fourthholder = randoms; }}
break;
}
}lineCtr++;
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
private void alertdialog(){
Context mcontext=this;
final AlertDialog.Builder alert = new AlertDialog.Builder(
mcontext);
if (level == 1){
alert.setIcon(R.drawable.gamestart);
alert.setTitle(" ");
alert.setPositiveButton("OK",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog,
int which) {
click.start();
dialog.cancel();
levelshow();
}
});
}else{
alert.setIcon(R.drawable.check);
alert.setTitle("CORRECT");
alert.setPositiveButton("Next",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog,
int which) {
click.start();
qn.setText("Question:"+level);
dialog.cancel();
if (level <= 11){
if(level == 11){
levelshow();}
else{
timer();
question();}}
else if(level <=21){
if(level == 21){
levelshow();}
else{
timer();
question2();}}
else if(level <=31){
if(level == 31){
levelshow();}
else{
timer();
question3();}}
else if(level <=41){
if(level == 41){
levelshow();}
else{
timer();
question4();}}
else if(level <=51){
if(level == 51){
levelshow();}
else{
timer();
question5();}}
else if(level <=61){
if(level == 61){
levelshow();}
else{
timer();
question6();}}
else if(level <=71){
if(level == 71){
levelshow();}
else{
timer();
question7();}}
else if(level <=81){
if(level == 81){
levelshow();}
else{
timer();
question8();}}
else if (level <=91){
if(level == 91){
levelshow();}
else{
timer();
question9();}}
else if (level <=100){
if(level == 100){
lo();}
else{
timer();
question10();}}
}
});
}
alert.show();
}
private void levelshow(){
Context mcontext=this;
final AlertDialog.Builder alert = new AlertDialog.Builder(
mcontext);
if (level == 1){
alert.setIcon(R.drawable.level);
alert.setTitle(" ");
alert.setPositiveButton("Start",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog,
int which) {
click.start();
dialog.cancel();
question();
timer();
}
});
}else if(level == 11){
alert.setIcon(R.drawable.level2);
alert.setTitle(" ");
alert.setPositiveButton("Start",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog,
int which) {
click.start();
dialog.cancel();
question2();
timer();
navigator.setText("LEVEL 2");
}
});
} if(level == 21){
alert.setIcon(R.drawable.level3);
alert.setTitle(" ");
alert.setPositiveButton("Start",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog,
int which) {
click.start();
dialog.cancel();
question3();
timer();
navigator.setText("LEVEL 3");
ll1.setVisibility(0);
}
});
} if(level == 31){
alert.setIcon(R.drawable.level4);
alert.setTitle(" ");
alert.setPositiveButton("Start",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog,
int which) {
click.start();
dialog.cancel();
question4();
timer();
navigator.setText("LEVEL 4");
}
});
}if(level == 41){
alert.setIcon(R.drawable.level5);
alert.setTitle(" ");
alert.setPositiveButton("Start",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog,
int which) {
click.start();
dialog.cancel();
question5();
timer();
navigator.setText("LEVEL 5");
ll2.setVisibility(0);
}
});
} if(level == 51){
alert.setIcon(R.drawable.level6);
alert.setTitle(" ");
alert.setPositiveButton("Start",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog,
int which) {
click.start();
dialog.cancel();
question6();
timer();
navigator.setText("LEVEL 6");
}
});
} if(level == 61){
alert.setIcon(R.drawable.level7);
alert.setTitle(" ");
alert.setPositiveButton("Start",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog,
int which) {
click.start();
dialog.cancel();
question7();
timer();
navigator.setText("LEVEL 7");
ll3.setVisibility(0);
}
});
} if(level == 71){
alert.setIcon(R.drawable.level8);
alert.setTitle(" ");
alert.setPositiveButton("Start",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog,
int which) {
click.start();
dialog.cancel();
question8();
timer();
navigator.setText("LEVEL 8");
}
});
} if(level == 81){
alert.setIcon(R.drawable.level9);
alert.setTitle(" ");
alert.setPositiveButton("Start",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog,
int which) {
click.start();
dialog.cancel();
question9();
timer();
navigator.setText("LEVEL 9");
ll4.setVisibility(0);
}
});
}if(level == 91){
alert.setIcon(R.drawable.level10);
alert.setTitle(" ");
alert.setPositiveButton("Start",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog,
int which) {
click.start();
dialog.cancel();
question10();
timer();
navigator.setText("LEVEL 10");
}
});
}
alert.show();
}
private void timer(){
final CountDownTimer Counter = new CountDownTimer(120000 , 1000) {
public void onTick(long millisUntilFinished) {
timer.setText(formatTime( millisUntilFinished));
scr.setText(""+ (millisUntilFinished*2)/1000);
}
public void onFinish() {
timer.setText("GAME OVER");
}
}; Counter.start();
submit.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
submit.startAnimation(anim2);
String u = test.getText().toString();
String p = ca.getText().toString();
if (u.equals(p)){
check.start();
scoring();
Counter.cancel();
level++;
alertdialog();
if (level == 10){
}
}
else {
wrong.start();
wrong();
}
if (v == submit){
firstbutton.setEnabled(true);
secondbutton.setEnabled(true);
thirdbutton.setEnabled(true);
fourthbutton.setEnabled(true);
fifthbutton.setEnabled(true);
sixthbutton.setEnabled(true);
seventhbutton.setEnabled(true);
eightthbutton.setEnabled(true);
test.setText("");
}
}
});
}
public void lo(){
AlertDialog.Builder alert = new AlertDialog.Builder(this);
alert.setTitle("CONGRATULATIONS");
alert.setMessage("you made in the top 10 highscores");
// Set an EditText view to get user input
final EditText input = new EditText(this);
alert.setView(input);
input.setGravity(Gravity.CENTER);
alert.setNegativeButton("Ok", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
if (input.getText().toString().equals("")){
Toast.makeText(Playing.this, "Please input your name!",
Toast.LENGTH_SHORT).show();
lo();
}
else{
getdata();
String data = input.getText().toString();
dataname = data;
getdata();
dialog.cancel();
finish();
}
}
});
alert.show();
}
private void wrong(){
Context mcontext=this;
final AlertDialog.Builder alert = new AlertDialog.Builder(
mcontext);
alert.setIcon(R.drawable.error1);
alert.setTitle("WRONG");
alert.setPositiveButton("try again",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog,
int which) {
click.start();
dialog.cancel();
}
});
alert.show();
}
private void scoring(){
fv = Integer.parseInt(scored.getText().toString());
sv = Integer.parseInt(scr.getText().toString());
ov = 0;
ov = fv + sv;
scored.setText("" + ov);
}
private void giveup(){
Context mcontext=this;
final AlertDialog.Builder alert = new AlertDialog.Builder(
mcontext);
alert.setTitle("Are you sure to give up?");
alert.setNegativeButton("Cancel",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog,
int which) {
click.start();
dialog.cancel();
} });
alert.setPositiveButton("OK",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog,
int which) {
click.start();
dialog.cancel();
ch();
if (top = true){
lo();
}else{
finish();
}
}
});
alert.show();
}
public void getdata(){
try{
String name = dataname;
String tsc = scored.getText().toString();
int tscore = Integer.parseInt(tsc);
highscore entry = new highscore(Playing.this);
entry.open();
entry.createEntry(name, tscore);
entry.close();
}catch(Exception e){
}
}
public void ch(){
try{
String tr = scored.getText().toString();
checks = Integer.parseInt(tr);
highscore check = new highscore(Playing.this);
check.open();
check.checkt(checks);
check.close();
}catch(Exception e){
}
}
}
公共类播放扩展了活动{
公共void onClick（视图v）{
如果（level在类Playing
的第449行抛出异常，则可以判断，因为从下到上这是堆栈跟踪在java代码中之前的最后一行
02-11 23:23:41.212:E/AndroidRuntime（2416）：在com.itinkdictionary.Playing.question（Playing.java:449）
您的问题可能会在使用此代码时出现：
int select = rand.nextInt(ar.size());
String random = ar.get(select);
它所做的是生成一个介于0和数组大小之间的随机数。但是，如果返回一个等于ar.size（）的整数，尝试访问此索引将导致您遇到的索引AutofBoundsException
。这是因为数组是从0索引的（即，50个元素的数组的索引为0到49，因此如果rand.nextInt返回50，则会出现错误）
这是一个简单的解决方案：
int select = rand.nextInt(ar.size()-1);
String random = ar.get(select);
向我们展示相关的代码。附加com.I链接字典.Playing
类的源代码。好的，首先，这只是一个错误。看看logcat，我猜Playing.java的第449行可能是for（）语句，您在其中放置了类似for的内容（i=0；i这是有用的信息，但不是答案-这应该列为一个评论，因为它不能解决问题，只是帮助诊断。作为一个拥有8000名代表的人，你应该知道我更喜欢一个好答案，很抱歉你不同意。尽量不要让它破坏你的一天。我的一天很好，谢谢你的提问=）但是回答的全部目的是解决问题。你没有，你在帮助诊断。保存“答案”以便最终被标记为一个-你是正确的，将在Playing.class
的第449行。但是在我们看到代码之前，不可能回答@Manny的问题（尽管正如我在评论中所说，我有一个很好的怀疑）为什么使用字符串？我需要将select转换为字符串吗？老兄…为什么使用向下投票？您使用了字符串！我只是编辑您的代码以使其工作，我没有质疑实现！更重要的是，我仍然在这里猜测，因为您没有在代码中输入行号，也没有突出显示您添加的代码上的第449行