我明白了，在我的 RelativeLayout 中必须有两个 TextView 和一个 ExpandableListView。经过长时间的交谈，我决定展示图片，以便您了解布局本身的行为。
有快照。第一个是 ExpandableListView 未展开时：
但是，当我尝试扩展此 ExpandableListView 时，我看到以下内容：
我们只能看到展开列表的一小部分，其颜色与下一个 TextView 的颜色相同。为什么会这样？我的目标是查看整个展开的 ExpandableListView。
xml的代码：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<ScrollView
android:id="@+id/scrollView1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:background="#000000" >
<LinearLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#00ff00" >
<TextView
android:id="@+id/user"
android:layout_width="match_parent"
android:layout_height="100dp"
android:paddingLeft="3dp"
android:text="Top User"
android:textColor="#111111"
android:background="#eeeeee"
android:textSize="22dp" />
<ExpandableListView
android:id="@+id/elvMain"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1" >
</ExpandableListView>
<TextView
android:id="@+id/about"
android:layout_width="match_parent"
android:layout_height="100dp"
android:text="Bottom About"
android:textColor="#6f6f6f"
android:textSize="24dp"
android:textStyle="bold" />
</LinearLayout>
</ScrollView>
以及活动的代码：
public class IngredientsActivity extends Activity {
private ArrayList<Ingredient> ingredients;
private Bitmap bitmap;
private final String TAG = "IngredientsActivity";
public void onCreate (Bundle bundle) {
super.onCreate(bundle);
setContentView(R.layout.ingredients_layout);
//ingredients = (ArrayList)getIntent().getSerializableExtra("ingredients");
//bitmap = (Bitmap)getIntent().getParcelableExtra("bitmap");
prepareIngredients(); //preparing ExpandableListView children
TextView user = (TextView)findViewById(R.id.user);
TextView about = (TextView)findViewById(R.id.about);
user.setText("Albert Einstein");
about.setText("Albert Einstein (play /ˈælbərt ˈaɪnstaɪn/; German: [ˈalbɐt ˈaɪnʃtaɪn] ( listen); 14 March 1879 – 18 April 1955) was a German theoretical physicist who developed the theory of general relativity, effecting a revolution in physics. For thisfor his services to theoretical physics, and especially for his discovery of the law of the photoelectric effect.[5] The latter was pivotal in establishing quantum theory within physics.");
}
private void prepareIngredients() {
SimpleExpandableListAdapter adapter;
final ExpandableListView list = (ExpandableListView)findViewById(R.id.elvMain);
ArrayList<Map<String, String>> groupData = new ArrayList<Map<String, String>>();
Map m = new HashMap<String, String>();
m.put("groupName", "Datas");
groupData.add(m);
String groupFrom[] = new String[] {"groupName"};
int groupTo[] = new int[] {R.id.groupname};
ArrayList<ArrayList<Map<String, String>>> childData = new ArrayList<ArrayList<Map<String, String>>>();
ArrayList<Map<String, String>> childDataItem = new ArrayList<Map<String, String>>();
for (Ingredient i : ingredients) {
Log.d(TAG, "Ingridient: " + i);
Map<String, String> m1 = new HashMap<String, String>();
StringBuilder ingredientsString = new StringBuilder();
String v = i.getValue();
if (!v.equals("null")) {
ingredientsString.append("- " + i.getName() + " " + v + i.getType());
} else {
ingredientsString.append("- " + i.getName() + " " + i.getType());
}
m1.put("levelTwoCat", ingredientsString.toString());
childDataItem.add(m1);
}
childData.add(childDataItem);
String childFrom[] = new String[] {"levelTwoCat"};
int childTo[] = new int[] {R.id.ingredients_second_layer_text};
adapter = new SimpleExpandableListAdapter (
this,
groupData,
R.layout.ingredients_first_layer,
groupFrom,
groupTo,
childData,
R.layout.ingredients_second_layer,
childFrom,
childTo);
list.setAdapter(adapter);
}
问题是一样的。如何在此布局中强制 ExpandableListView 展开？现在它没有像它必须的那样扩展。（请参阅顶部的快照）。