我创建了一个首选项,它具有自定义ImageView布局,如下所示:
<Preference
android:key="profile_picture_preference"
android:layout="@layout/layout_profile_picture"></Preference>
我的布局是:
<?xml version="1.0" encoding="utf-8"?>
<ImageView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/profileImageView"
android:layout_width="75dp"
android:layout_height="75dp"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:layout_marginBottom="10dp"
android:layout_marginTop="10dp"
android:background="#ABCDEF" />
但我不知道如何获得它的参考。我试图通过这样做来获取它在onCreateView方法中:
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = super.onCreateView(inflater, container, savedInstanceState);
ImageView imageView = (ImageView) view.findViewById(R.id.profileImageView);
return view;
}
但ImageView为空。
感谢您的帮助。
答案 0 :(得分:1)
您可以在主题中指定自定义布局。在那里,您可以添加ImageView
例如:
<强> styles.xml 强>
<style name="YourTheme" parent="Theme.AppCompat">
<!-- ... -->
<item name="preferenceTheme">@style/YourTheme.PreferenceThemeOverlay</item>
</style>
<style name="YourTheme.PreferenceThemeOverlay" parent="@style/PreferenceThemeOverlay">
<item name="android:layout">@layout/fragment_your_preferences</item>
</style>
<强> fragment_your_preferences.xml 强>
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:id="@+id/profileImageView"
android:layout_width="75dp"
android:layout_height="75dp"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:layout_marginBottom="10dp"
android:layout_marginTop="10dp"
android:background="#ABCDEF" />
<!-- Required ViewGroup for PreferenceFragmentCompat -->
<FrameLayout
android:id="@+id/list_container"
android:layout_width="match_parent"
android:layout_height="wrap_content">
</FrameLayout>
</LinearLayout>
然后在您的片段类onViewCreated()
中,您可以开始使用ImageView
:
@Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState)
{
super.onViewCreated(view, savedInstanceState);
ImageView image_view = (ImageView)view.findViewById(R.id.profileImageView);
if (image_view != null)
{
// Your code
}
}
答案 1 :(得分:0)
我没有找到任何正式的方式。所以我这样管理:
@Override
public RecyclerView onCreateRecyclerView(LayoutInflater inflater, ViewGroup parent, Bundle savedInstanceState) {
recyclerView = super.onCreateRecyclerView(inflater, parent, savedInstanceState);
recyclerView.addOnChildAttachStateChangeListener(new RecyclerView.OnChildAttachStateChangeListener() {
@Override
public void onChildViewAttachedToWindow(View view) {
if (view.getId() == R.id.profileImageView) {
profileImageView = (ImageView) view;
}
}
@Override
public void onChildViewDetachedFromWindow(View view) {
}
});
return recyclerView;
}