In place of writing string statement to create table use this class

CreateTableHelper.java

package com.example.android.sunshine.experiment.model;

import com.example.android.sunshine.data.WeatherContract;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

/**
 * Created by gwl on 11/5/17.
 */

public class CreateTableHelper {
private HashMap<String,String> mHashMapColumnName;
    public static final String CONSTANT_PRIMARY_KEY = "INTEGER PRIMARY KEY AUTOINCREMENT,";
    public static final String CONSTANT_INTEGER = "INTEGER NOT NULL,";
    public static final String CONSTANT_REAL = "REAL NOT NULL,";
    private String tableName;

    public CreateTableHelper(String tableName) {
        this.tableName = tableName;
        mHashMapColumnName = new HashMap<>();
    }
    public void addColumn(String name,String type)
    {
     mHashMapColumnName.put(name,type);
    }

    public String createStatement()
    {
        Iterator iter = (Iterator) mHashMapColumnName.keySet().iterator();
       String tablequery = "CREATE TABLE " + tableName + " (" ;
        while(iter.hasNext()) {
    Map.Entry entry = (Map.Entry) iter.next();
         tablequery=   tablequery + entry.getKey().toString() + entry.getValue().toString();
        }
        tablequery = tablequery+")";
        return tablequery;
    }



}