2701-View-Expandable

1.通过ExpandableListActivity实现一个ExpandableList并实现点击list 显示menu的操作

/* * Copyright (C) 2007 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 com.example.android.apis.view;import android.app.ExpandableListActivity;import android.os.Bundle;import android.view.ContextMenu;import android.view.Gravity;import android.view.MenuItem;import android.view.View;import android.view.ViewGroup;import android.view.ContextMenu.ContextMenuInfo;import android.widget.AbsListView;import android.widget.BaseExpandableListAdapter;import android.widget.ExpandableListAdapter;import android.widget.ExpandableListView;import android.widget.TextView;import android.widget.Toast;import android.widget.ExpandableListView.ExpandableListContextMenuInfo;import com.example.android.apis.R;/** * Demonstrates expandable lists using a custom {@link ExpandableListAdapter} * from {@link BaseExpandableListAdapter}. */public class ExpandableList1 extends ExpandableListActivity {    ExpandableListAdapter mAdapter;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        // Set up our adapter        mAdapter = new MyExpandableListAdapter();        setListAdapter(mAdapter);        registerForContextMenu(getExpandableListView());    }    @Override    public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) {        menu.setHeaderTitle("Sample menu");        menu.add(0, 0, 0, R.string.expandable_list_sample_action);    }        @Override    public boolean onContextItemSelected(MenuItem item) {        ExpandableListContextMenuInfo info = (ExpandableListContextMenuInfo) item.getMenuInfo();        String title = ((TextView) info.targetView).getText().toString();                int type = ExpandableListView.getPackedPositionType(info.packedPosition);        if (type == ExpandableListView.PACKED_POSITION_TYPE_CHILD) {            int groupPos = ExpandableListView.getPackedPositionGroup(info.packedPosition);             int childPos = ExpandableListView.getPackedPositionChild(info.packedPosition);             Toast.makeText(this, title + ": Child " + childPos + " clicked in group " + groupPos,                    Toast.LENGTH_SHORT).show();            return true;        } else if (type == ExpandableListView.PACKED_POSITION_TYPE_GROUP) {            int groupPos = ExpandableListView.getPackedPositionGroup(info.packedPosition);             Toast.makeText(this, title + ": Group " + groupPos + " clicked", Toast.LENGTH_SHORT).show();            return true;        }                return false;    }    /**     * A simple adapter which maintains an ArrayList of photo resource Ids.      * Each photo is displayed as an image. This adapter supports clearing the     * list of photos and adding a new photo.     *     */    public class MyExpandableListAdapter extends BaseExpandableListAdapter {        // Sample data set.  children[i] contains the children (String[]) for groups[i].        private String[] groups = { "People Names", "Dog Names", "Cat Names", "Fish Names" };        private String[][] children = {                { "Arnold", "Barry", "Chuck", "David" },                { "Ace", "Bandit", "Cha-Cha", "Deuce" },                { "Fluffy", "Snuggles" },                { "Goldy", "Bubbles" }        };                public Object getChild(int groupPosition, int childPosition) {            return children[groupPosition][childPosition];        }        public long getChildId(int groupPosition, int childPosition) {            return childPosition;        }        public int getChildrenCount(int groupPosition) {            return children[groupPosition].length;        }        public TextView getGenericView() {            // Layout parameters for the ExpandableListView            AbsListView.LayoutParams lp = new AbsListView.LayoutParams(                    ViewGroup.LayoutParams.MATCH_PARENT, 64);            TextView textView = new TextView(ExpandableList1.this);            textView.setLayoutParams(lp);            // Center the text vertically            textView.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);            // Set the text starting position            textView.setPadding(36, 0, 0, 0);            return textView;        }                public View getChildView(int groupPosition, int childPosition, boolean isLastChild,                View convertView, ViewGroup parent) {            TextView textView = getGenericView();            textView.setText(getChild(groupPosition, childPosition).toString());            return textView;        }        public Object getGroup(int groupPosition) {            return groups[groupPosition];        }        public int getGroupCount() {            return groups.length;        }        public long getGroupId(int groupPosition) {            return groupPosition;        }        public View getGroupView(int groupPosition, boolean isExpanded, View convertView,                ViewGroup parent) {            TextView textView = getGenericView();            textView.setText(getGroup(groupPosition).toString());            return textView;        }        public boolean isChildSelectable(int groupPosition, int childPosition) {            return true;        }        public boolean hasStableIds() {            return true;        }    }}

2.介绍通过cusor创建一个ExpandableList

/* * Copyright (C) 2007 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 com.example.android.apis.view;import android.app.ExpandableListActivity;import android.content.ContentUris;import android.content.Context;import android.database.Cursor;import android.net.Uri;import android.os.Bundle;import android.provider.Contacts.People;import android.widget.ExpandableListAdapter;import android.widget.SimpleCursorTreeAdapter;/** * Demonstrates expandable lists backed by Cursors */public class ExpandableList2 extends ExpandableListActivity {    private int mGroupIdColumnIndex;         private String mPhoneNumberProjection[] = new String[] {            People.Phones._ID, People.Phones.NUMBER    };        private ExpandableListAdapter mAdapter;        @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        // Query for people        Cursor groupCursor = managedQuery(People.CONTENT_URI,                new String[] {People._ID, People.NAME}, null, null, null);        // Cache the ID column index        mGroupIdColumnIndex = groupCursor.getColumnIndexOrThrow(People._ID);        // Set up our adapter        mAdapter = new MyExpandableListAdapter(groupCursor,                this,                android.R.layout.simple_expandable_list_item_1,                android.R.layout.simple_expandable_list_item_1,                new String[] {People.NAME}, // Name for group layouts                new int[] {android.R.id.text1},                new String[] {People.NUMBER}, // Number for child layouts                new int[] {android.R.id.text1});        setListAdapter(mAdapter);    }    public class MyExpandableListAdapter extends SimpleCursorTreeAdapter {        public MyExpandableListAdapter(Cursor cursor, Context context, int groupLayout,                int childLayout, String[] groupFrom, int[] groupTo, String[] childrenFrom,                int[] childrenTo) {            super(context, cursor, groupLayout, groupFrom, groupTo, childLayout, childrenFrom,                    childrenTo);        }        @Override        protected Cursor getChildrenCursor(Cursor groupCursor) {            // Given the group, we return a cursor for all the children within that group             // Return a cursor that points to this contact's phone numbers            Uri.Builder builder = People.CONTENT_URI.buildUpon();            ContentUris.appendId(builder, groupCursor.getLong(mGroupIdColumnIndex));            builder.appendEncodedPath(People.Phones.CONTENT_DIRECTORY);            Uri phoneNumbersUri = builder.build();            // The returned Cursor MUST be managed by us, so we use Activity's helper            // functionality to manage it for us.            return managedQuery(phoneNumbersUri, mPhoneNumberProjection, null, null, null);        }    }}

通过list map定义一个ExpandableList

/* * Copyright (C) 2007 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 com.example.android.apis.view;import android.app.ExpandableListActivity;import android.os.Bundle;import android.widget.ExpandableListAdapter;import android.widget.SimpleExpandableListAdapter;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;/** * Demonstrates expandable lists backed by a Simple Map-based adapter */public class ExpandableList3 extends ExpandableListActivity {    private static final String NAME = "NAME";    private static final String IS_EVEN = "IS_EVEN";        private ExpandableListAdapter mAdapter;        @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        List<Map<String, String>> groupData = new ArrayList<Map<String, String>>();        List<List<Map<String, String>>> childData = new ArrayList<List<Map<String, String>>>();        for (int i = 0; i < 20; i++) {            Map<String, String> curGroupMap = new HashMap<String, String>();            groupData.add(curGroupMap);            curGroupMap.put(NAME, "Group " + i);            curGroupMap.put(IS_EVEN, (i % 2 == 0) ? "This group is even" : "This group is odd");                        List<Map<String, String>> children = new ArrayList<Map<String, String>>();            for (int j = 0; j < 15; j++) {                Map<String, String> curChildMap = new HashMap<String, String>();                children.add(curChildMap);                curChildMap.put(NAME, "Child " + j);                curChildMap.put(IS_EVEN, (j % 2 == 0) ? "This child is even" : "This child is odd");            }            childData.add(children);        }                // Set up our adapter        mAdapter = new SimpleExpandableListAdapter(                this,                groupData,                android.R.layout.simple_expandable_list_item_1,                new String[] { NAME, IS_EVEN },                new int[] { android.R.id.text1, android.R.id.text2 },                childData,                android.R.layout.simple_expandable_list_item_2,                new String[] { NAME, IS_EVEN },                new int[] { android.R.id.text1, android.R.id.text2 }                );        setListAdapter(mAdapter);    }}