Android 从片段类访问UI元素
我有一个类扩展了fragment类,如下所示:Android 从片段类访问UI元素,android,android-fragments,Android,Android Fragments,我有一个类扩展了fragment类,如下所示: public class FragmentCreateGroup extends Fragment { @Override public void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); ImageView
public class FragmentCreateGroup extends Fragment {
@Override
public void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
ImageView group=(ImageView)findViewById(R.id.group_image);//shows error here
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
// TODO Auto-generated method stub
return inflater.inflate(R.layout.fragment_creategroup, container,false);
}
}
它与以下xml文件关联
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/LinearLayout1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:contentDescription="@string/cr_group_grpname_desc"
android:gravity="center"
android:orientation="vertical" >
<ImageView
android:id="@+id/group_image"
android:layout_width="139dp"
android:layout_height="144dp"
android:src="@drawable/background" />
<EditText
android:id="@+id/cr_group_grpname_input"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="37dp"
android:contentDescription="@string/cr_group_grpname_desc"
android:ems="10"
android:hint="@string/cr_group_grpname_hint"
android:inputType="text" >
<requestFocus />
</EditText>
<Button
android:id="@+id/cr_group_creategrp_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="42dp"
android:background="@drawable/greenbutton"
android:paddingLeft="10dp"
android:paddingRight="10dp"
android:text="@string/cr_group_creategrp_btn_label" />
</LinearLayout>
我尝试使用findviewbyd()访问片段布局中的ImageView。因为我没有扩展活动类,所以无法执行此操作。有没有办法从非活动类访问UI元素?如果有,如何执行 在onCreateView中充气后需要获取视图
public class FragmentCreateGroup extends Fragment {
private ImageView group;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_creategroup, container, false);
group = (ImageView) v.findViewById(R.id.group_image);
group.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
group.setImageDrawable(); // set image here
}
});
return v;
}
}我需要在onClick上更改ImageView。如何做到这一点?您应该将ImageView设置为全局,然后在定义后可以访问它。我将编辑我的答案以显示这一点如果我必须从其他活动访问ImageView怎么办?如何获取当前活动片段的对象?