java - 我如何解决 java.lang.ArrayIndexOutOfBoundsException 错误

Question

您好，我正在开发使用自定义 ListView 的 Android 应用程序，但我不断收到 java.lang.ArrayIndexOutOfBoundsException 错误。但我在代码中找不到任何错误，我可能在哪里出错了。

public class MainActivity extends Activity {

    ListView lv_event;

    List<HashMap<String, String>> alist;

    String[] event_name = { "The Kampala City Festival",
            "The Awakening (Lantern Meet of Poets Recital)" };
    int[] event_img = { R.drawable.kla_festival, R.drawable.city_rooming };
    String[] event_date = { "October 6th, 2013", "October 4th, 2013" };
    String[] event_venue = { "Watoto Church, Central", "National Theatre" };
    String[] event_time = { "11:30 am", "07:00 pm" };
    String[] event_info = { "The #KampalaCityFestival will on Sunday 6th October",
             "From the creators of Broken Voices of the Revolution "
             };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        setUI();
        setEventList();
    }

    private void setEventList() {
        // TODO Auto-generated method stub
        try {
            alist = new ArrayList<HashMap<String, String>>();
            for (int i = 0; i < 3; i++) {
                HashMap<String, String> hm = new HashMap<String, String>();
                hm.put("event_picture", Integer.toString(event_img[i]));
                hm.put("event_name", event_name[i]);
                hm.put("event_date", event_date[i]);
                hm.put("event_venue", event_venue[i]);
                hm.put("event_time", event_time[i]);
                hm.put("event_info", event_info[i]);
                alist.add(hm);
            }

            // from
            String[] from = { "event_picture", "event_name", "event_date",
                    "event_venue", "event_time", "event_info" };
            // to
            int[] to = { R.id.img_view_event, R.id.tv_event_name, R.id.tv_date,
                    R.id.tv_event_place, R.id.tv_time, R.id.tv_event_info };

            SimpleAdapter adapter = new SimpleAdapter(getApplicationContext(),
                    alist, R.layout.lv_custom, from, to);

            lv_event.setAdapter(adapter);
        } catch (Exception e) {
            // TODO Auto-generated catch block
            Toast.makeText(getApplicationContext(), e.toString(),
                    Toast.LENGTH_LONG).show();
        }

    }

    private void setUI() {
        // TODO Auto-generated method stub
        lv_event = (ListView) findViewById(R.id.lv_event);
    }

Answer 1

您正在尝试对数组进行三次迭代，期望每个数组中有三个元素。

但是这里您只定义了两个值，例如:

String[] event_name = { "The Kampala City Festival",
        "The Awakening (Lantern Meet of Poets Recital)" };

这可能就是你得到 ArrayIndexOutOfBoundsException 的原因

所以尝试改变i < 3至i < 2 ，如果您希望数组中只有 2 个元素，或者向只有 2 个值的数组中添加一个元素。