如何将外部jar导入netbeans android项目？

Question

我使用属性将jar lib导入到android项目中并添加了jar lib。我在编译时没有出错，但我“不幸的是，iDate已经停止了”。在android上运行项目之后。这是我的代码。请帮助找到共鸣。

package com.hasibul.idate;

import android.app.Activity;
import android.os.Bundle;
import android.os.CountDownTimer;
import android.view.Gravity;
import android.widget.EditText;
import java.text.SimpleDateFormat;
import java.util.Date;
import org.joda.time.DateTime;
import org.joda.time.chrono.IslamicChronology;

public class MainActivity extends Activity
{
private EditText lbl1,lbl2,lbl3;
private IslamicDateConverter islamicDateConverter;

/** Called when the activity is first created.
 * @param savedInstanceState */
@Override
public void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    lbl1 = (EditText)findViewById(R.id.label1);
    lbl1.setGravity(Gravity.CENTER);
    lbl2 = (EditText)findViewById(R.id.label2);
    lbl2.setGravity(Gravity.CENTER);
    lbl3 = (EditText)findViewById(R.id.label3);
    lbl3.setGravity(Gravity.CENTER);

    //islamic date maker
    islamicDateConverter = new IslamicDateConverter();

    //get current time
    long millisec = System.currentTimeMillis();

    //start the timer and wait for one second
    new CountDownTimer(millisec, 1000) {

        private final Date today = new Date();
        private final SimpleDateFormat engTime = new SimpleDateFormat("hh:mm:ss a"); 
        private final SimpleDateFormat engdate = new SimpleDateFormat("EE dd MMM yyyy");

        private final DateTime dateTme = new DateTime(today);
        private final DateTime islamicDate =                       dateTme.withChronology(IslamicChronology.getInstance()); 
        private String todayEngTime;
        private final String todayEngDate = engdate.format(today);

        private final String month =    islamicDateConverter.getMonthName(islamicDate.getMonthOfYear());  
        private final String day = islamicDateConverter.getDayName(islamicDate.getDayOfWeek());
        private final int week = islamicDate.getDayOfMonth();
        private final int year = islamicDate.getYear();

        @Override
        public void onTick(long l) {
            todayEngTime = engTime.format(new Date());

            lbl1.setText(todayEngDate);
            lbl2.setText(todayEngTime);
            lbl3.setText(day+" "+week+" "+month+" "+year);
        }

        @Override
        public void onFinish() {
            //never finish
        }
    }.start();
}

}