安卓自定义Listview view=null问题

Question

我有一个自定义的listview和textview，checkbox，edittext在上面。我想迭代我的listview行，并获取textview、checkbox和edittext的值。当迭代到达页面末尾时，不能使用不可见的行、部件值和崩溃。我想我必须自动向下滚动我的列表视图。如何解决此问题？

注意:我有12行，但是它在第6行之后崩溃了，如果不向下滚动我的listview，cz就不能看到第7行。

这是我的代码：

public void onSave(View view) {
        ArrayList<String> olcum = new ArrayList<String>();
        ArrayList<String> orneklemebuyukluk = new ArrayList<String>();
        EditText et;
        CheckBox chx;
        TextView buyukluk;
        String nitel="0";
        for (int i = 0; i < list_olcum_view.getCount(); i++) {
            view = list_olcum_view.getChildAt(i);
            et = (EditText) view.findViewById(R.id.edt_olcum);
            chx=(CheckBox)view.findViewById(R.id.txt_orneklemenitel);
            olcum.add(et.getText().toString());

         }
}

Answer 1

Note: I have 12 rows but it crashs after 6th row cz cannot see 7th row without scrolldown my listview.

public void onSave(View view) {
        ArrayList<String> olcum = new ArrayList<String>();
        ArrayList<String> orneklemebuyukluk = new ArrayList<String>();
        EditText et;
        CheckBox chx;
        TextView buyukluk;
        String nitel="0";
        for (int i = 0; i < list_olcum_view.getCount(); i++) {
            view = list_olcum_view.getChildAt(i);
            et = (EditText) view.findViewById(R.id.edt_olcum);
            chx=(CheckBox)view.findViewById(R.id.txt_orneklemenitel);
            olcum.add(et.getText().toString());

}
}