代码如下,lv的值为什么会一直为null?
MyFragment类:
public class MyFragment extends Fragment {
TextView tv;
ListView lv;
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.list_item, container, false);
lv = (ListView) v.findViewById(R.id.wifiTv);
tv = (TextView) v.findViewById(R.id.textView);
Judgement();
return v;
}
}
Layout文件:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity">
<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/unroot"
android:textSize="20sp"
android:visibility="gone" />
<ListView
android:id="@+id/wifiTv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:listSelector="@android:color/transparent"
android:scrollbarStyle="outsideOverlay" />
</LinearLayout>
Debug如图
layout文件使用错了,在你贴出的layout代码里并没有看到RelativeLayout的定义,但是tv却出现了RelativeLayout
还有,建议控件的初始化写在onViewCreated而非onCreateView