Code 2

Code:

/*
 * Copyright (C) 2013 Code Here Now - A subsidiary of Mobs & Geeks
 *
 * 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.codeherenow.sicalculator;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.SeekBar;

public class SICalculatorActivity extends Activity
        implements SeekBar.OnSeekBarChangeListener, View.OnClickListener{
    private int years;
    private TextView YT;
    private SeekBar bar;
    private EditText principal;
    private EditText interest;
    public EditText pvalue;
    public EditText ivalue;
    private double mPvalue = 0;
    private double mIvalue = 0;
    TextView fTextView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.sicalculator);
        TextView fTextView = (TextView) findViewById(R.id.finalText);
        pvalue = (EditText) findViewById(R.id.PA_field);
        ivalue  = (EditText) findViewById(R.id.IR_field);
        bar = (SeekBar)findViewById(R.id.seekBar);
        bar.setOnSeekBarChangeListener(this);
        pvalue = (EditText) principal.getText();
        ivalue = (EditText) interest.getText();
        String s = principal.getText().toString();
        mPvalue = Double.parseDouble(s);
        String s2 = interest.getText().toString();
        mIvalue = Double.parseDouble(s2);
        YT = (TextView) findViewById(R.id.Years);

    }
        @Override
        public void onProgressChanged (SeekBar seekBar,int i, boolean b){
            years = i;
            YT.setText(years + " Year(s)");

        }

        @Override
        public void onStartTrackingTouch (SeekBar seekBar){

        }

        @Override
        public void onStopTrackingTouch (SeekBar seekBar){

        }

    @Override
    public void onClick(View view) {

        double finValue = mPvalue * (mIvalue/100) * years;
        fTextView.setText("The interest for " + pvalue + "at a rate of " + ivalue + "for " + years + "year(s) is " + finValue);
    }
}


LOGCAT:

03-04 18:48:14.527      984-984/com.codeherenow.sicalculator D/AndroidRuntime﹕ Shutting down VM
03-04 18:48:14.527      984-984/com.codeherenow.sicalculator W/dalvikvm﹕ threadid=1: thread exiting with uncaught exception (group=0xa624c288)
03-04 18:48:14.531      984-984/com.codeherenow.sicalculator E/AndroidRuntime﹕ FATAL EXCEPTION: main
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.codeherenow.sicalculator/com.codeherenow.sicalculator.SICalculatorActivity}: java.lang.NullPointerException
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2059)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
            at android.app.ActivityThread.access$600(ActivityThread.java:130)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
            at android.os.Handler.dispatchMessage(Handler.java:99)
            at android.os.Looper.loop(Looper.java:137)
            at android.app.ActivityThread.main(ActivityThread.java:4745)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:511)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
            at dalvik.system.NativeStart.main(Native Method)
     Caused by: java.lang.NullPointerException
            at com.codeherenow.sicalculator.SICalculatorActivity.onCreate(SICalculatorActivity.java:45)
            at android.app.Activity.performCreate(Activity.java:5008)
            at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
            at android.app.ActivityThread.access$600(ActivityThread.java:130)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
            at android.os.Handler.dispatchMessage(Handler.java:99)
            at android.os.Looper.loop(Looper.java:137)
            at android.app.ActivityThread.main(ActivityThread.java:4745)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:511)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
            at dalvik.system.NativeStart.main(Native Method)
03-04 18:48:17.355      984-984/com.codeherenow.sicalculator I/Process﹕ Sending signal. PID: 984 SIG: 9