com.zns.comicdroid.adapter.AutoCompleteAdapter.java Source code

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Here is the source code for com.zns.comicdroid.adapter.AutoCompleteAdapter.java

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/*******************************************************************************
 * Copyright (c) 2013 Ulrik Andersson.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the GNU Public License v3.0
 * which accompanies this distribution, and is available at
 * http://www.gnu.org/licenses/gpl.html
 * 
 * Contributors:
 *     Ulrik Andersson - initial API and implementation
 ******************************************************************************/
package com.zns.comicdroid.adapter;

import com.zns.comicdroid.BaseFragmentActivity;

import android.content.Context;
import android.database.Cursor;
import android.os.Handler;
import android.support.v4.widget.SimpleCursorAdapter;
import android.widget.FilterQueryProvider;

public class AutoCompleteAdapter extends SimpleCursorAdapter
        implements FilterQueryProvider, SimpleCursorAdapter.CursorToStringConverter {

    private Cursor mCursorPublishers;
    private CharSequence mStrPublisherQuery;
    private final Runnable mRunPublisherAC;
    private final Handler mHandlerAutoComplete;
    private final int mColumnIndex;
    private final String mSql;

    public AutoCompleteAdapter(Context context, String sql, String columnName, int columnIndex) {
        super(context, android.R.layout.simple_dropdown_item_1line, null, new String[] { columnName },
                new int[] { android.R.id.text1 }, 0);

        this.mSql = sql;
        this.mColumnIndex = columnIndex;
        this.mHandlerAutoComplete = new Handler();

        mRunPublisherAC = new Runnable() {
            @Override
            public void run() {
                if (AutoCompleteAdapter.this.mContext instanceof BaseFragmentActivity) {
                    if (mCursorPublishers != null)
                        mCursorPublishers.close();
                    mCursorPublishers = ((BaseFragmentActivity) AutoCompleteAdapter.this.mContext).getDBHelper()
                            .getCursor(AutoCompleteAdapter.this.mSql, new String[] { mStrPublisherQuery + "%" });
                    changeCursor(mCursorPublishers);
                }
            }
        };

        setFilterQueryProvider(this);
        setCursorToStringConverter(this);
    }

    @Override
    public Cursor runQuery(CharSequence constraint) {
        if (constraint != null && constraint.length() > 0) {
            mStrPublisherQuery = constraint;
            mHandlerAutoComplete.removeCallbacks(mRunPublisherAC);
            mHandlerAutoComplete.postDelayed(mRunPublisherAC, 1000);
        }
        return null;
    }

    @Override
    public CharSequence convertToString(Cursor cursor) {
        return cursor.getString(mColumnIndex);
    }

    public void close() {
        if (mCursorPublishers != null && !mCursorPublishers.isClosed())
            mCursorPublishers.close();
    }
}