src/com/android/im/app/ContactListFilterView.java

/*
 * Copyright (C) 2008 Esmertec AG.
 * Copyright (C) 2008 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.android.im.app;

import android.content.Context;
import android.database.Cursor;
import android.database.DatabaseUtils;
import android.net.Uri;
import android.util.AttributeSet;
import android.view.View;
import android.widget.AdapterView;
import android.widget.Filter;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.ResourceCursorAdapter;
import android.widget.AdapterView.OnItemClickListener;

import com.android.im.R;
import com.android.im.provider.Imps;

public class ContactListFilterView extends LinearLayout {

    private ListView mContactListView;
    private Filter mFilter;
    private ContactAdapter mContactAdapter;

    private Uri mUri;

    public ContactListFilterView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    protected void onFinishInflate() {

        mContactListView = (ListView) findViewById(R.id.filteredList);
        mContactListView.setTextFilterEnabled(true);

        mContactListView.setOnItemClickListener(new OnItemClickListener() {
            public void onItemClick(AdapterView parent, View view, int position,
                    long id) {
                if (mContext instanceof ContactListActivity) {
                    ContactListActivity list = (ContactListActivity) mContext;
                    mContactListView.setSelection(position);
                    Cursor c = (Cursor) mContactListView.getSelectedItem();
                    list.mContactListView.startChat(c);
                    list.showContactListView();
                }
            }
        });
    }

    public ListView getListView() {
        return mContactListView;
    }

    public Cursor getContactAtPosition(int position) {
        return (Cursor) mContactAdapter.getItem(position);
    }

    public void doFilter(Uri uri, String filterString) {
        if (!uri.equals(mUri)) {
            mUri = uri;

            Cursor contactCursor = runQuery(filterString);

            if (mContactAdapter == null) {
                mContactAdapter = new ContactAdapter(mContext, contactCursor);
                mFilter = mContactAdapter.getFilter();
                mContactListView.setAdapter(mContactAdapter);
            } else {
                mContactAdapter.changeCursor(contactCursor);
            }
        } else {
            mFilter.filter(filterString);
        }
    }

    Cursor runQuery(CharSequence constraint) {
        StringBuilder buf = new StringBuilder();

        // exclude chatting contact
        buf.append(Imps.Chats.LAST_MESSAGE_DATE);
        buf.append(" IS NULL");

        if (constraint != null) {
            buf.append(" AND ");
            buf.append(Imps.Contacts.NICKNAME);
            buf.append(" LIKE ");
            DatabaseUtils.appendValueToSql(buf, "%" + constraint + "%");
        }

        return mContext.getContentResolver().query(mUri, ContactView.CONTACT_PROJECTION,
                buf == null ? null : buf.toString(), null, Imps.Contacts.DEFAULT_SORT_ORDER);
    }

    private class ContactAdapter extends ResourceCursorAdapter {
        private String mSearchString;

        public ContactAdapter(Context context, Cursor cursor) {
            super(context, R.layout.contact_view, cursor);
        }

        @Override
        public void bindView(View view, Context context, Cursor cursor) {
            ContactView v = (ContactView) view;
            v.setPadding(0, 0, 0, 0);
            v.bind(cursor, mSearchString, false);
        }

        @Override
        public Cursor runQueryOnBackgroundThread(CharSequence constraint) {
            if (constraint != null) {
                mSearchString = constraint.toString();
            }
            return ContactListFilterView.this.runQuery(constraint);
        }
    }

}