我正在尝试控制weightSum以实现片段的线性布局。我想知道是否可以使用setWeightSum(float)方法做到这一点。我试图控制ID为header_Linear的线性布局中的权重和。
<LinearLayout
android:id="@+id/header_Linear"
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="?android:attr/actionBarSize"
android:orientation="horizontal"
android:weightSum="8">
<TextView
android:id="@+id/table_0.0"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:visibility="visible"
android:background="@drawable/header_bg"/>
<TextView
android:id="@+id/table_0.1"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:textAlignment="center"
android:gravity="center"
android:text="M"
android:textColor="@color/colorTableItem"
android:visibility="visible"
android:background="@drawable/header_bg"/>
<TextView
android:id="@+id/table_0.2"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:gravity="center"
android:text="T"
android:textColor="@color/colorTableItem"
android:visibility="visible"
android:background="@drawable/header_bg"/>
<TextView
android:id="@+id/table_0.3"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:gravity="center"
android:text="W"
android:textColor="@color/colorTableItem"
android:visibility="visible"
android:background="@drawable/header_bg"/>
<TextView
android:id="@+id/table_0.4"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:gravity="center"
android:text="T"
android:visibility="visible"
android:textColor="@color/colorTableItem"
android:background="@drawable/header_bg"/>
<TextView
android:id="@+id/table_0.5"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:gravity="center"
android:text="F"
android:visibility="visible"
android:textColor="@color/colorTableItem"
android:background="@drawable/header_bg"/>
<TextView
android:id="@+id/table_0.6"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:gravity="center"
android:text="S"
android:textColor="@color/colorTableItem"
android:visibility="visible"
android:background="@drawable/header_bg"/>
<TextView
android:id="@+id/table_0.7"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:gravity="center"
android:text="S"
android:textColor="@color/sunday_text_color"
android:visibility="visible"
android:background="@drawable/header_bg"/>
</LinearLayout>
这是我使用setWeightSum的片段
public class TimeTableFragment extends Fragment {
public View onCreateView(@NonNull LayoutInflater inflater,
ViewGroup container, Bundle savedInstanceState) {
View root = inflater.inflate(R.layout.fragment_timetable, container, false);
LinearLayout linearLayout = root.findViewById(R.id.header_Linear);
SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(Objects.requireNonNull(getContext()));
String header_value = sharedPreferences.getString("Header","0");
Toast.makeText(getContext(),""+header_value,Toast.LENGTH_LONG).show();
if (header_value.equals("0")){
linearLayout.setWeightSum(6);
}
return root;
}
当我启动应用程序时,它崩溃了。我想知道是否有可能控制weightSum而不会出错。非常感谢你
Upup
即使我使用findViewById声明线性布局,我也得到nullPointException的原因是由于布局中的
xmlns:android="http://schemas.android.com/apk/res/android"
。在这种情况下,使用findViewById后,包含
xmlns:android="http://schemas.android.com/apk/res/android"
的视图将返回null]
我正在尝试控制weightSum以实现片段的线性布局。我想知道是否可以使用setWeightSum(float)方法做到这一点。我试图在id为...的线性布局中控制权重和...
public class TimeTableFragment extends Fragment {
public View onCreateView(@NonNull LayoutInflater inflater,
ViewGroup container, Bundle savedInstanceState) {
View root = inflater.inflate(R.layout.fragment_timetable, container, false);
return root;
}
@Override
public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
LinearLayout linearLayout = view.findViewById(R.id.header_Linear);
SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(Objects.requireNonNull(getContext()));
String header_value = sharedPreferences.getString("Header","0");
Toast.makeText(getContext(),""+header_value,Toast.LENGTH_LONG).show();
if (header_value.equals("0")){
linearLayout.setWeightSum(6);
}
}
}