BigData.java

import android.util.Log;

import java.util.ArrayList;
import java.util.Random;

public class BigData {
    static int msDataIndex = 0;

    int mDataIndex = 0;
    String mDataName = "";
    ArrayList<String> mList = new ArrayList<String>();

    // コンストラクタでは何もしないでおく
    public BigData(){
        String table = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
        mDataIndex = msDataIndex++;
        mDataName = String.valueOf(table.charAt(mDataIndex % table.length()));
        Log.d("test", "...BigData" + mDataName);
    }

    public void load(){
        Log.d("test", "...load" + mDataName);
        try{
            Random r = new Random();
            for(int i = 0; i < 3000; i++){
                if(i % 100 == 0){
                    Log.d("test", "...loading" + mDataName + ":" + i);
                }
                int n = r.nextInt(10000);
                mList.add("item" + mDataName + "_" + n);
                Thread.sleep(1);
            }
        }
        catch(InterruptedException ex){
            Log.d("test", "======InterruptedException" + mDataName);
        }
    }

    String at(int index){
        return mList.get(index)  ;
    }
}