/*
* Copyright (C) 2006 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.widget;
import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.view.LayoutInflater;
import java.util.List;
import java.util.Map;
/**
* An easy adapter to map static data to group and child views defined in an XML
* file. You can separately specify the data backing the group as a List of
* Maps. Each entry in the ArrayList corresponds to one group in the expandable
* list. The Maps contain the data for each row. You also specify an XML file
* that defines the views used to display a group, and a mapping from keys in
* the Map to specific views. This process is similar for a child, except it is
* one-level deeper so the data backing is specified as a List<List<Map>>,
* where the first List corresponds to the group of the child, the second List
* corresponds to the position of the child within the group, and finally the
* Map holds the data for that particular child.
*/
public class SimpleExpandableListAdapter extends BaseExpandableListAdapter {
private List<? extends Map<String, ?>> mGroupData;
private int mExpandedGroupLayout;
private int mCollapsedGroupLayout;
private String[] mGroupFrom;
private int[] mGroupTo;
private List<? extends List<? extends Map<String, ?>>> mChildData;
private int mChildLayout;
private int mLastChildLayout;
private String[] mChildFrom;
private int[] mChildTo;
private LayoutInflater mInflater;
/**
* Constructor
*
* @param context The context where the {@link ExpandableListView}
* associated with this {@link SimpleExpandableListAdapter} is
* running
* @param groupData A List of Maps. Each entry in the List corresponds to
* one group in the list. The Maps contain the data for each
* group, and should include all the entries specified in
* "groupFrom"
* @param groupFrom A list of keys that will be fetched from the Map
* associated with each group.
* @param groupTo The group views that should display column in the
* "groupFrom" parameter. These should all be TextViews. The
* first N views in this list are given the values of the first N
* columns in the groupFrom parameter.
* @param groupLayout resource identifier of a view layout that defines the
* views for a group. The layout file should include at least
* those named views defined in "groupTo"
* @param childData A List of List of Maps. Each entry in the outer List
* corresponds to a group (index by group position), each entry
* in the inner List corresponds to a child within the group
* (index by child position), and the Map corresponds to the data
* for a child (index by values in the childFrom array). The Map
* contains the data for each child, and should include all the
* entries specified in "childFrom"
* @param childFrom A list of keys that will be fetched from the Map
* associated with each child.
* @param childTo The child views that should display column in the
* "childFrom" parameter. These should all be TextViews. The
* first N views in this list are given the values of the first N
* columns in the childFrom parameter.
* @param childLayout resource identifier of a view layout that defines the
* views for a child. The layout file should include at least
* those named views defined in "childTo"
*/
public SimpleExpandableListAdapter(Context context,
List<? extends Map<String, ?>> groupData, int groupLayout,
String[] groupFrom, int[] groupTo,
List<? extends List<? extends Map<String, ?>>> childData,
int childLayout, String[] childFrom, int[] childTo) {
this(context, groupData, groupLayout, groupLayout, groupFrom, groupTo, childData,
childLayout, childLayout, childFrom, childTo);
}
/**
* Constructor
*
* @param context The context where the {@link ExpandableListView}
* associated with this {@link SimpleExpandableListAdapter} is
* running
* @param groupData A List of Maps. Each entry in the List corresponds to
* one group in the list. The Maps contain the data for each
* group, and should include all the entries specified in
* "groupFrom"
* @param groupFrom A list of keys that will be fetched from the Map
* associated with each group.
* @param groupTo The group views that should display column in the
* "groupFrom" parameter. These should all be TextViews. The
* first N views in this list are given the values of the first N
* columns in the groupFrom parameter.
* @param expandedGroupLayout resource identifier of a view layout that
* defines the views for an expanded group. The layout file
* should include at least those named views defined in "groupTo"
* @param collapsedGroupLayout resource identifier of a view layout that
* defines the views for a collapsed group. The layout file
* should include at least those named views defined in "groupTo"
* @param childData A List of List of Maps. Each entry in the outer List
* corresponds to a group (index by group position), each entry
* in the inner List corresponds to a child within the group
* (index by child position), and the Map corresponds to the data
* for a child (index by values in the childFrom array). The Map
* contains the data for each child, and should include all the
* entries specified in "childFrom"
* @param childFrom A list of keys that will be fetched from the Map
* associated with each child.
* @param childTo The child views that should display column in the
* "childFrom" parameter. These should all be TextViews. The
* first N views in this list are given the values of the first N
* columns in the childFrom parameter.
* @param childLayout resource identifier of a view layout that defines the
* views for a child. The layout file should include at least
* those named views defined in "childTo"
*/
public SimpleExpandableListAdapter(Context context,
List<? extends Map<String, ?>> groupData, int expandedGroupLayout,
int collapsedGroupLayout, String[] groupFrom, int[] groupTo,
List<? extends List<? extends Map<String, ?>>> childData,
int childLayout, String[] childFrom, int[] childTo) {
this(context, groupData, expandedGroupLayout, collapsedGroupLayout,
groupFrom, groupTo, childData, childLayout, childLayout,
childFrom, childTo);
}
/**
* Constructor
*
* @param context The context where the {@link ExpandableListView}
* associated with this {@link SimpleExpandableListAdapter} is
* running
* @param groupData A List of Maps. Each entry in the List corresponds to
* one group in the list. The Maps contain the data for each
* group, and should include all the entries specified in
* "groupFrom"
* @param groupFrom A list of keys that will be fetched from the Map
* associated with each group.
* @param groupTo The group views that should display column in the
* "groupFrom" parameter. These should all be TextViews. The
* first N views in this list are given the values of the first N
* columns in the groupFrom parameter.
* @param expandedGroupLayout resource identifier of a view layout that
* defines the views for an expanded group. The layout file
* should include at least those named views defined in "groupTo"
* @param collapsedGroupLayout resource identifier of a view layout that
* defines the views for a collapsed group. The layout file
* should include at least those named views defined in "groupTo"
* @param childData A List of List of Maps. Each entry in the outer List
* corresponds to a group (index by group position), each entry
* in the inner List corresponds to a child within the group
* (index by child position), and the Map corresponds to the data
* for a child (index by values in the childFrom array). The Map
* contains the data for each child, and should include all the
* entries specified in "childFrom"
* @param childFrom A list of keys that will be fetched from the Map
* associated with each child.
* @param childTo The child views that should display column in the
* "childFrom" parameter. These should all be TextViews. The
* first N views in this list are given the values of the first N
* columns in the childFrom parameter.
* @param childLayout resource identifier of a view layout that defines the
* views for a child (unless it is the last child within a group,
* in which case the lastChildLayout is used). The layout file
* should include at least those named views defined in "childTo"
* @param lastChildLayout resource identifier of a view layout that defines
* the views for the last child within each group. The layout
* file should include at least those named views defined in
* "childTo"
*/
public SimpleExpandableListAdapter(Context context,
List<? extends Map<String, ?>> groupData, int expandedGroupLayout,
int collapsedGroupLayout, String[] groupFrom, int[] groupTo,
List<? extends List<? extends Map<String, ?>>> childData,
int childLayout, int lastChildLayout, String[] childFrom,
int[] childTo) {
mGroupData = groupData;
mExpandedGroupLayout = expandedGroupLayout;
mCollapsedGroupLayout = collapsedGroupLayout;
mGroupFrom = groupFrom;
mGroupTo = groupTo;
mChildData = childData;
mChildLayout = childLayout;
mLastChildLayout = lastChildLayout;
mChildFrom = childFrom;
mChildTo = childTo;
mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
public Object getChild(int groupPosition, int childPosition) {
return mChildData.get(groupPosition).get(childPosition);
}
public long getChildId(int groupPosition, int childPosition) {
return childPosition;
}
public View getChildView(int groupPosition, int childPosition, boolean isLastChild,
View convertView, ViewGroup parent) {
View v;
if (convertView == null) {
v = newChildView(isLastChild, parent);
} else {
v = convertView;
}
bindView(v, mChildData.get(groupPosition).get(childPosition), mChildFrom, mChildTo);
return v;
}
/**
* Instantiates a new View for a child.
* @param isLastChild Whether the child is the last child within its group.
* @param parent The eventual parent of this new View.
* @return A new child View
*/
public View newChildView(boolean isLastChild, ViewGroup parent) {
return mInflater.inflate((isLastChild) ? mLastChildLayout : mChildLayout, parent, false);
}
private void bindView(View view, Map<String, ?> data, String[] from, int[] to) {
int len = to.length;
for (int i = 0; i < len; i++) {
TextView v = (TextView)view.findViewById(to[i]);
if (v != null) {
v.setText((String)data.get(from[i]));
}
}
}
public int getChildrenCount(int groupPosition) {
return mChildData.get(groupPosition).size();
}
public Object getGroup(int groupPosition) {
return mGroupData.get(groupPosition);
}
public int getGroupCount() {
return mGroupData.size();
}
public long getGroupId(int groupPosition) {
return groupPosition;
}
public View getGroupView(int groupPosition, boolean isExpanded, View convertView,
ViewGroup parent) {
View v;
if (convertView == null) {
v = newGroupView(isExpanded, parent);
} else {
v = convertView;
}
bindView(v, mGroupData.get(groupPosition), mGroupFrom, mGroupTo);
return v;
}
/**
* Instantiates a new View for a group.
* @param isExpanded Whether the group is currently expanded.
* @param parent The eventual parent of this new View.
* @return A new group View
*/
public View newGroupView(boolean isExpanded, ViewGroup parent) {
return mInflater.inflate((isExpanded) ? mExpandedGroupLayout : mCollapsedGroupLayout,
parent, false);
}
public boolean isChildSelectable(int groupPosition, int childPosition) {
return true;
}
public boolean hasStableIds() {
return true;
}
}
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