android - 带有标题和 MergeAdapter 的可点击 ListViews 在 ListItemClick 上使应用程序崩溃

Question

我在返回一个 ListView 或多个 ListView 的组合并与来自 Commonsware 的 MergeAdapter 合并的 Activity 中遇到问题。这是一种搜索 Activity ，基于搜索查询将返回来自一个或多个不同类别的结果。当类别超过 1 个时，我插入一个标题，这是另一个只有一行的 ListView - 类别的名称。

部分代码:

public class FirstAdapter extends ArrayAdapter<Address> {
public FirstAdapter (Context context, int resource,
        int textViewResourceId, List<Address> objects) {
    super(context, resource, textViewResourceId, objects);
}

public View getView (int position, View convertView, ViewGroup parent) {
    View view = super.getView(position, convertView, parent);
    Address location = this.getItem(position);

    TextView textView = (TextView) view.findViewById(R.id.SearchResultTextAddress);
    textView.setText(location.address);

    return view;
}

然后我有一个头适配器:

public class HeaderAdapter extends ArrayAdapter<String> {
private String header;

public HeaderAdapter(Context context, int resource,
        int textViewResourceId, String header) {
    super(context, resource, textViewResourceId, new ArrayList<String>());

    this.header = header;
}

public void setVisible(boolean visible) {
    if (visible) show();
    else hide();
}

public void show() {
    clear();
    add(this.header);
}

public void hide() {
    clear();
}

public View getView (int position, View convertView, ViewGroup parent) {
    return super.getView(position, convertView, parent);
}

public String getHeader() {
    return header;
}

public void setHeader(String header) {
    this.header = header;
}

@Override
public boolean isEnabled(int position) {
    return false;
}

}

如您所见，只有在必要时才会显示。在我的 Activity 中，我重写了一个 onListItemClick:

@Override
protected void onListItemClick(ListView listview, View view, int position, long id) {
    super.onListItemClick(listview, view, position, id);

    if (this.firstAdapter.getCount() > 0) {
        position--;
        if (position < this.firstAdapter.getCount()) onRepClick(this.firstAdapter.getItem(position));
        position = position - this.firstAdapter.getCount();
    }

    if (this.secondAdapter.getCount() > 0) {
        position--;
        if (position < this.secondAdapter.getCount()) onAusschussClick(this.secondHeader.getItem(position));
        position = position - this.secondAdapter.getCount();
    }

因此，当我只有一个适配器中的一个类别时，一切正常。当我从其中两个获得结果时，我得到一个 ArrayIndexOutOfBoundsException。我认为我获得职位的逻辑不正确。任何想法将不胜感激，谢谢。

这是堆栈跟踪:

06-28 12:56:54.291: E/AndroidRuntime(3963): FATAL EXCEPTION: main
06-28 12:56:54.291: E/AndroidRuntime(3963): java.lang.ArrayIndexOutOfBoundsException
06-28 12:56:54.291: E/AndroidRuntime(3963):     at java.util.ArrayList.get(ArrayList.java:313)
06-28 12:56:54.291: E/AndroidRuntime(3963):     at android.widget.ArrayAdapter.getItem(ArrayAdapter.java:298)
06-28 12:56:54.291: E/AndroidRuntime(3963):     at com.jasamer.callarep.SearchActivity.onListItemClick(SearchActivity.java:136)
06-28 12:56:54.291: E/AndroidRuntime(3963):     at android.app.ListActivity$2.onItemClick(ListActivity.java:319)
06-28 12:56:54.291: E/AndroidRuntime(3963):     at android.widget.AdapterView.performItemClick(AdapterView.java:284)
06-28 12:56:54.291: E/AndroidRuntime(3963):     at android.widget.ListView.performItemClick(ListView.java:3513)
06-28 12:56:54.291: E/AndroidRuntime(3963):     at android.widget.AbsListView$PerformClick.run(AbsListView.java:1849)
06-28 12:56:54.291: E/AndroidRuntime(3963):     at android.os.Handler.handleCallback(Handler.java:587)
06-28 12:56:54.291: E/AndroidRuntime(3963):     at android.os.Handler.dispatchMessage(Handler.java:92)
06-28 12:56:54.291: E/AndroidRuntime(3963):     at android.os.Looper.loop(Looper.java:130)
06-28 12:56:54.291: E/AndroidRuntime(3963):     at android.app.ActivityThread.main(ActivityThread.java:3835)
06-28 12:56:54.291: E/AndroidRuntime(3963):     at java.lang.reflect.Method.invokeNative(Native Method)
06-28 12:56:54.291: E/AndroidRuntime(3963):     at java.lang.reflect.Method.invoke(Method.java:507)
06-28 12:56:54.291: E/AndroidRuntime(3963):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:847)
06-28 12:56:54.291: E/AndroidRuntime(3963):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:605)
06-28 12:56:54.291: E/AndroidRuntime(3963):     at dalvik.system.NativeStart.main(Native Method)

Answer 1

好吧，解决方案变得不同而且简单得多。在 if 语句中，我必须更改:if (position < this.firstAdapter.getCount())到以下: if ((position < this.firstAdapter.getCount() && position >= 0))

通过这种方式，我将确保不会出现负数，并且无论我有多少 header ，索引都将始终正确。