Question

我是Android的新手并且在水平滑动中陷入困境。让我详细解释一下，如果用户点击ListView项目，我在ListView中有几个数据 - 详细说明页面打开，这里我需要水平滑动“详细说明”页面。我使用pageIndicator库下载并测试了一些教程。终于能够得到ListView数据但是当点击列表项时它会强制关闭，logcat中的错误说OutOfBound Exception请帮助我，谢谢。

Logcat异常

01-22 12:28:46.530: E/AndroidRuntime(1084): FATAL EXCEPTION: main
01-22 12:28:46.530: E/AndroidRuntime(1084): java.lang.IndexOutOfBoundsException: Invalid index 0, size is 0
01-22 12:28:46.530: E/AndroidRuntime(1084):     at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:257)
01-22 12:28:46.530: E/AndroidRuntime(1084):     at java.util.ArrayList.get(ArrayList.java:311)
01-22 12:28:46.530: E/AndroidRuntime(1084):     at com.jokes.LayoutTwo.onCreateView(LayoutTwo.java:70)
 01-22 12:28:46.530: E/AndroidRuntime(1084):    at android.support.v4.app.Fragment.performCreateView(Fragment.java:1500)
01-22 12:28:46.530: E/AndroidRuntime(1084):     at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:927)

LayoutTwo.java

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    ViewGroup root = (ViewGroup) inflater.inflate(R.layout.samples, null);

         TextView txttitle = (TextView) root.findViewById(R.id.titles);
  ///////// The exception arises in below line ///////
     txttitle.setText(Common.rowItems.get(Common.itemnumber).get("strtitle"));   

     TextView txtDescription = (TextView) root.findViewById(R.id.description);
     txtDescription.setText(Common.rowItems.get(Common.itemnumber).get("strDesc"));

     Intent in = getActivity().getIntent();        
        String strtitle = in.getStringExtra("strtitle");
        String strDesc = in.getStringExtra("strDesc");

    return root;
}

但是我已经在MainActivity中正确地给出了数组长度。 MainActivity.java

 @Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

 rowItems = new ArrayList<RowItem>();
 for (int i = 0; i < titles.length; i++) {
 RowItem item = new RowItem(titles[i], descriptions[i]);
 rowItems.add(item);
  }

  listView = (ListView) findViewById(R.id.list);
 CustomListViewAdapter adapter = new CustomListViewAdapter(this,
    R.layout.list_item, rowItems);
  listView.setAdapter(adapter);
  listView.setOnItemClickListener(this);
   }

 @Override
 public void onItemClick(AdapterView<?> parent, View view, int position,
  long id) {
TextView txttl = (TextView) view.findViewById(R.id.title);  
String strtitle = txttl.getText().toString();


TextView txtls = (TextView) view.findViewById(R.id.desc);   
String strDesc = txtls.getText().toString();

// Launching new Activity on selecting single List Item
Intent i = new Intent(getApplicationContext(), ViewPagerStyle1Activity.class);
// sending data to new activity
i.putExtra("strtitle", strtitle);
i.putExtra("strDesc", strDesc);
startActivity(i);
   }
 }

Answer 1

txttitle.setText(Common.rowItems.get(Common.itemnumber).get("strtitle"));

我想Common.rowItems在调用此行时尚未填充。所以它是空的。现在Common.itemnumber似乎是“0”。它要求一个空结构的第一个元素。

要解决此问题，您必须先检查Common.itemnumber是否具有合理的值才能首先索引到Common.rowItems。如果没有，那么设置默认文本或类似的东西。或者当然，确保已填写Common.rowItems。但你仍然应该验证索引是否超出范围。

Answer 2

像这样使用：

Intent in = getActivity().getIntent();        
String strtitle = in.getStringExtra("strtitle");
String strDesc = in.getStringExtra("strDesc");

TextView txttitle = (TextView) root.findViewById(R.id.titles);
TextView txtDescription = (TextView) root.findViewById(R.id.description);

txttitle.setText(strtitle);        
txtDescription.setText(strDesc);

android中的Array-Out Of Bound Exception

2 个答案: