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textView应该是实例,我不知道为什么它说textView.setText(“测试”)NullPointerException;NullPointerException当尝试setText
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater inflater = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View rowView = inflater.inflate(R.layout.list_navdrawer, parent, false);
TextView textView = (TextView) rowView.getTag(android.R.id.text1);
textView.setText("test");
if (position == mSelectedItem) {
textView.setTextColor(getContext().getResources().getColor(android.R.color. holo_blue_dark));
textView.setTypeface(Typeface.DEFAULT_BOLD);
} else {
textView.setTextColor(getContext().getResources().getColor(android.R.color.white));
}
return textView;
}
使用调试器。它是空的,因为textview在当前布局中不存在,或者它的ID不是android.R.id.text1。无论哪种方式,调试器会立即显示给您。 – Simon 2014-11-22 23:59:19
可能重复[什么是空指针异常,以及如何解决它?](http://stackoverflow.com/questions/218384/what-is-a-null-pointer-exception-and-how-do -i-fix-it) – Simon 2014-11-22 23:59:51
“android.R.id.text1”应该只是“R.id.text1”,不是吗? – Hacketo 2014-11-23 00:24:24