这件事到底是什么
public class MainActivity extends AppCompatActivity {
ArrayList<String> celebrityURL = new ArrayList<>();
int chosenCeleb = 0;
ImageView celebrityImage;
int locationAnswer = 0;
//random answers
ArrayList<String> answers = new ArrayList<>();
//random buttons reference
Button button01;
Button button02;
Button button03;
Button button04;
ArrayList<String> names = new ArrayList<>();
public void selectCeleb(View view) {
if (view.getTag().toString().equals(Integer.toString(locationAnswer))) {
Toast.makeText(getApplicationContext(), "CORRECT ", Toast.LENGTH_LONG).show();
} else {
Toast.makeText(getApplicationContext(), "WRONG, IT WAS: " + names.get(chosenCeleb), Toast.LENGTH_SHORT).show();
}
randomCelebrity();
}
public class imagesGet extends AsyncTask<String, Void, Bitmap> {
@Override
protected Bitmap doInBackground(String... params) {
try {
URL imagesURL = new URL(params[0]);
HttpURLConnection connection = (HttpURLConnection) imagesURL.openConnection();
connection.connect();
InputStream inputStream = connection.getInputStream();
Bitmap bitmap = BitmapFactory.decodeStream(inputStream);
return bitmap;
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
}
public class getData extends AsyncTask<String, Void, String> {
@Override
protected String doInBackground(String... urls) {
String result = "";
URL url;
HttpURLConnection connection = null;
try {
url = new URL(urls[0]);
connection = (HttpURLConnection) url.openConnection();
InputStream inputStream = connection.getInputStream();
InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
int data = inputStreamReader.read();
while (data != -1) {
char current = (char) data;
result += current;
data = inputStreamReader.read();
}
return result;
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
celebrityImage = (ImageView) findViewById(R.id.celebrityID);
button01 = (Button) findViewById(R.id.celebrity01);
button02 = (Button) findViewById(R.id.celebrity02);
button03 = (Button) findViewById(R.id.celebrity03);
button04 = (Button) findViewById(R.id.celebrity04);
getData task = new getData();
String resultData = null;
try {
try {
resultData = task.execute("http://www.posh24.se/kandisar").get();
} catch (InterruptedException e) {
e.printStackTrace();
}
String[] spResult = resultData.split("<div class\"sidebarContainer\">");
//images
Pattern pattern = Pattern.compile("img src=\"(.*?)\"");
Matcher matcher = pattern.matcher(spResult[0]);
while (matcher.find()) {
celebrityURL.add(matcher.group(1));
}
//names of the celebrities
pattern = Pattern.compile("alt=\"(.*?)\"");
matcher = pattern.matcher(spResult[0]);
while (matcher.find()) {
names.add(matcher.group(1));
}
} catch (ExecutionException e) {
e.printStackTrace();
}
randomCelebrity();
}
public void randomCelebrity() {
//random celebrity
Random random = new Random();
chosenCeleb = random.nextInt
//between zero and the size of celebURL
(celebrityURL.size());
//update imageView with new celebrity image
imagesGet imagesGet = new imagesGet();
Bitmap celebBitmap;
try {
celebBitmap = imagesGet.execute(celebrityURL.get(chosenCeleb)).get();
celebrityImage.setImageBitmap(celebBitmap);
int incorrectLocation;
locationAnswer = random.nextInt(4);
for (int i = 0; i < answers.size(); i++) {
if (i == locationAnswer) {
//update answers
answers.get(chosenCeleb);
} else {
//create random celebrity from celebs urls
incorrectLocation = random.nextInt(celebrityURL.size());
//avoid getting the correct and wrong answer in same location
//generate random answer if this condition is met
while (incorrectLocation == chosenCeleb) {
incorrectLocation = random.nextInt(celebrityURL.size());
}
//assign wrong location answer in answers array
answers.get(names.indexOf(incorrectLocation));
}
}
button01.setText(answers.get(0));
button02.setText(answers.get(1));
button03.setText(answers.get(2));
button04.setText(answers.get(3));
} catch (ExecutionException e) {
e.printStackTrace();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
我将代码分开，以便您可以更好地查看代码。我不知道如何解决这个问题，但我知道它与ArrayList的答案有关。 我正在尝试制作一个随机获取HTML数据并在Android应用程序中显示它的应用程序。我正在制作一个应用程序来质疑名人的名字。
编辑：抱歉，我忘了包含错误
FATAL EXCEPTION: main
Process: com.stringmanipulation.stringmanipulation, PID: 24397
java.lang.IllegalStateException: Could not execute method for android:onClick
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:293)
at android.view.View.performClick(View.java:5610)
at android.view.View$PerformClick.run(View.java:22265)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6077)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invoke(Native Method)
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288)
at android.view.View.performClick(View.java:5610)
at android.view.View$PerformClick.run(View.java:22265)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6077)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)
Caused by: java.lang.IndexOutOfBoundsException: Index: 103, Size: 100
at java.util.ArrayList.get(ArrayList.java:411)
at com.stringmanipulation.stringmanipulation.MainActivity.randomCelebrity(MainActivity.java:183)
at com.stringmanipulation.stringmanipulation.MainActivity.selectCeleb(MainActivity.java:53)
at java.lang.reflect.Method.invoke(Native Method)
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288)
at android.view.View.performClick(View.java:5610)
at android.view.View$PerformClick.run(View.java:22265)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
答案 0 :(得分：1)
在您突出显示导致问题的行之前，我将无法帮助您准确地解决问题
IndexOutOfBoundsException是您尝试访问数组并请求索引太高时抛出的异常。示例:(这适用于ArrayList和其他类型的数组）
ArrayList<Integer> ex = new ArrayList<>();
int exceptionThrownHere = ex.get(0);
当您尝试从索引超出范围的列表中获取对象时，抛出异常。另一个例子：
int[] ex = new int[10];
//initialize for this example to be valid
int exceptionThrownHere = ex[10];
在这种情况下，最大索引是9（0-9），如果你试图得到10或更多，你会得到例外。
解决方案:(需要抛出异常的行以获得准确答案）
确保您没有尝试获取索引大于列表中对象数量的对象。另一个解决方案是检查ArrayList中有多少对象（使用.size()），并确保您没有尝试访问大于列表中对象数量的索引。
从分析你的代码，我看到（假设所有代码都在问题中），你永远不会向数组中添加任何东西＆＃34;答案＆＃34; - 因此列表中没有对象，它会导致异常。确保通过以下方式将对象添加到列表中：
answers.add("whatever string you need here");
另见