我在LinearLayout
( main.xml )中有一个ScrollView
视图元素:
<ScrollView ...>
<LinearLayout
android:id="@+id/root"
android:orientation="vertical"
>
<TextView .../>
<EditText .../>
...
</LinearLayout>
</ScrollView>
如上所述, root LinearLayout
中还有一些其他元素。
现在,我想以编程方式(动态)向LinearLayout
(id =“root”)添加更多视图。
我尝试了以下方式向此 root 添加更多子视图:
首先,我创建了一个位于单独布局文件中的子视图:
child.xml
<LinearLayout
android:id="@+id/child"
>
<TextView id="mytxt"... />
<ListView id="mylist".../>
</LinearLayout>
其次,我膨胀&amp;获取上面子视图的两个实例,初始化里面的元素:
/***inflate 1st child, initialize its elements***/
LinearLayout child_1 = (LinearLayout) inflater.inflate(R.layout.child, null);
TextView txt1 = (TextView)child_1.findViewById(R.id.mytxt);
txt1.setText("CAR");
ListView list1 = (ListView)child_1.findViewById(R.id.mylist);
// Code to initialize 'list1' (I did not paste code here)
/*** inflate 2nd child, initialize its elements ****/
LinearLayout child_2 = (LinearLayout) inflater.inflate(R.layout.child, null);
TextView txt2 = (TextView)child_2.findViewById(R.id.mytxt);
txt2.setText("PLANE");
ListView list2 = (ListView)child_2.findViewById(R.id.mylist);
// Code to initialize 'list2' (I did not paste code here)
最后,我将它们添加到 root LinearLayout
:
//get root
View contentView = inflater.inflate(R.layout.main, null);
LinearLayout root = (LinearLayout) contentView.findViewById(R.id.root);
//add child views
root.add(child_1);
root.add(child_2);
当我在设备上运行我的应用时,我只能看到child_2
布局,而不会在“root”下看到child_1
,为什么?
答案 0 :(得分:2)
在LinearLayout默认方向是水平设置它垂直.......
这 http://developer.android.com/reference/android/widget/LinearLayout.html
见
默认方向是水平的。
and you set text in txt1.setText("PLANE"); set in txt2.setText("PLANE");
both text set in same textview
.....
txt1.setText("CAR");
txt1.setText("PLANE");
答案 1 :(得分:1)
如何创建布局?你是通过setContentView(int)
做到的吗?然后,您应该在活动中执行此操作来检索该实例:
findViewById(R.id.root);