以编程方式将规则添加到布局中已有的视图 - Android

Question

如何向布局中已有的视图添加规则？

我的XML:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/relative_layout_id"
android:layout_width="match_parent"
android:layout_height="match_parent"
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="com.example.mylifeinformationsharedsocial.SexAcivity" >
<ListView
    android:id="@+id/list_view_id"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    />    

</RelativeLayout>

我要添加layoutParams.addRule(RelativeLayout.BELOW,myView.getId()); 但是如果我再次将视图添加到布局中，它会给我一个 IllegalStateException（显然哈哈）。

那我该怎么做呢？

编辑

Java:

listView = (ListView) findViewById(R.id.list_view_id);
listView.setAdapter(myArrayAdapter);

layoutParams.addRule(RelativeLayout.BELOW,datePicker.getId());
relativeLayout.addView(listView,layoutParams);

它在 addView() 方法中抛出异常

Answer 1

正如 Matthias 建议的那样：

layoutParams = new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT);
layoutParams.addRule(RelativeLayout.BELOW,myView.getId());
listView.setLayoutParams(layoutParams);

Answer 2

您无法添加视图，因为它已经添加。因此，您需要设置正确的布局参数。您可以创建新的或检索当前的并更改它们。签出 this post.

layoutParams = new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT);
layoutParams.addRule(RelativeLayout.BELOW,myView.getId());
listView.setLayoutParams(layoutParams);

以编程方式将规则添加到布局中已有的视图 - Android

Adding Rule programatically to a View that is already in the layout - Android

java

android

android-layout

layoutparams