Android可扩展列表：如何为布局组添加不同的布局

我的问题是，当单击第一个位置的组时，它会正确显示子项，但当我单击下一个组项时，应用程序崩溃

@Override
public View getChildView(final int i, int i2, boolean b, View v, ViewGroup viewGroup) {

    if (v==null) {
        LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        int itemType = getChildType(i, i2);

        int grup_pos = (int) getGroupId(i);
        switch (itemType`enter code here`) {
            case 0:
                v = inflater.inflate(R.layout.child_contact, null);
                Toast.makeText(context.getApplicationContext(), "position is" + grup_pos, Toast.LENGTH_SHORT).show();
                break;
            case 1:
                v = inflater.inflate(R.layout.child_faq_answer, null);
                Toast.makeText(context.getApplicationContext(), "position is" + grup_pos, Toast.LENGTH_SHORT).show();
                break;
            case 2:
                v = inflater.inflate(R.layout.child_main_contact, null);
                Toast.makeText(context.getApplicationContext(), "position is" + grup_pos, Toast.LENGTH_SHORT).show();
                break;
            case 3:
                v = inflater.inflate(R.layout.child_events_items, null);
                Toast.makeText(context.getApplicationContext(), "position is" + grup_pos, Toast.LENGTH_SHORT).show();
                break;
            case 4:
                v = inflater.inflate(R.layout.child_program, null);
                Toast.makeText(context.getApplicationContext(), "position is" + grup_pos, Toast.LENGTH_SHORT).show();
                break;
            case 5:
                v = inflater.inflate(R.layout.item_faq_answer, null);
                Toast.makeText(context.getApplicationContext(), "position is" + grup_pos, Toast.LENGTH_SHORT).show();
                break;
            case 6:
                v = inflater.inflate(R.layout.child_program, null);
                Toast.makeText(context.getApplicationContext(), "position is" + grup_pos, Toast.LENGTH_SHORT).show();
                break;
        }
    }
    v.invalidate();
    return v;
}

这就是我得到的错误

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另外，当应用程序崩溃时，会出现什么错误？如果你有stacktrace的话，你应该把它贴出来。对不起，Mamata，我没听清楚。我应该在哪里添加onClick？？E/AndroidRuntime﹕ 致命异常：main java.lang.ArrayIndexOutOfBoundsException:length=2；android.widget.AbsListView$RecycleBin.addScrapViewAbsListView.java:6773位于android.widget.ListView.layoutChildrenListView.java:1602位于android.widget.AbsListView.onLayoutAbsListView.java:2056位于android.view.view.layoutView.java:14118位于java:4467代码块缩进堆栈跟踪以使其可读。

E/AndroidRuntime﹕ FATAL EXCEPTION: main
    java.lang.ArrayIndexOutOfBoundsException: length=2; index=2
            at android.widget.AbsListView$RecycleBin.addScrapView(AbsListView.java:6773)
            at android.widget.ListView.layoutChildren(ListView.java:1602)
            at android.widget.AbsListView.onLayout(AbsListView.java:2056)
            at android.view.View.layout(View.java:14118)
            at android.view.ViewGroup.layout(ViewGroup.java:4467)
            at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1670)
            at android.widget.LinearLayout.layoutHorizontal(LinearLayout.java:1659)
            at android.widget.LinearLayout.onLayout(LinearLayout.java:1443)
            at android.view.View.layout(View.java:14118)
            at android.view.ViewGroup.layout(ViewGroup.java:4467)
            at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1021)
            at android.view.View.layout(View.java:14118)
            at android.view.ViewGroup.layout(ViewGroup.java:4467)
            at android.widget.FrameLayout.onLayout(FrameLayout.java:448)
            at android.view.View.layout(View.java:14118)
            at android.view.ViewGroup.layout(ViewGroup.java:4467)
            at android.support.v7.internal.widget.ActionBarOverlayLayout.onLayout(ActionBarOverlayLayout.java:493)
            at android.view.View.layout(View.java:14118)
            at android.view.ViewGroup.layout(ViewGroup.java:4467)
            at android.widget.FrameLayout.onLayout(FrameLayout.java:448)
            at android.view.View.layout(View.java:14118)
            at android.view.ViewGroup.layout(ViewGroup.java:4467)
            at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1670)
            at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1528)
            at android.widget.LinearLayout.onLayout(LinearLayout.java:1441)
            at android.view.View.layout(View.java:14118)
            at android.view.ViewGroup.layout(ViewGroup.java:4467)
            at android.widget.FrameLayout.onLayout(FrameLayout.java:448)
            at android.view.View.layout(View.java:14118)
            at android.view.ViewGroup.layout(ViewGroup.java:4467)
            at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2202)
            at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1966)
            at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1158)
            at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4914)
            at android.view.Choreographer$CallbackRecord.run(Choreographer.java:776)
            at android.view.Choreographer.doCallbacks(Choreographer.java:579)
            at android.view.Choreographer.doFrame(Choreographer.java:548)
            at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:762)
            at android.os.Handler.handleCallback(Handler.java:800)
            at android.os.Handler.dispatchMessage(Handler.java:100)
            at android.os.Looper.loop(Looper.java:194)
            at android.app.ActivityThread.main(ActivityThread.java:5371)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:525)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:833)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
            at dalvik.system.NativeStart.main(Native Method)