how to make the library project's method working in another project in android?

I have a project which I am trying to use in another new project, my existing project java code is here:

package com.powergroup.splitview;
 
 import android.content.Intent;
 import android.graphics.Color;
 import android.os.Bundle;
 import android.support.v4.app.FragmentActivity;
 import android.view.View;
 import android.view.Window;
 import android.view.WindowManager;
 import android.widget.Button;
 import android.widget.LinearLayout;
 import android.widget.LinearLayout.LayoutParams;
 import android.widget.TextView;
 
 public class SplitviewActivity extends FragmentActivity implements
         Left.OnButtonClickListener {
 
     LinearLayout LEFT, RIGHT, leftfragmentln, rightfragmentln;
     Right rightFr;
     Left leftFr;
 
 
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         //reduced the Gray Bar
         requestWindowFeature(Window.FEATURE_NO_TITLE);
         getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                 WindowManager.LayoutParams.FLAG_FULLSCREEN);
 
 
         setContentView(R.layout.main);
         // initializes the objects
         initializer();
 
         // sets the size of the two sides, give the ration here
         setSize(20, 80);
         // sets the colour of the two sides
         setColor(Color.BLUE, Color.RED);
 
     }
 
     public void initializer() {
         LEFT = (LinearLayout) findViewById(R.id.lnLeft);
         RIGHT = (LinearLayout) findViewById(R.id.lnRight);
         leftfragmentln = (LinearLayout) findViewById(R.id.lnLeftFragment);
         rightfragmentln = (LinearLayout) findViewById(R.id.lnRightFragment);
         rightFr = (Right) getSupportFragmentManager().findFragmentById(
                 R.id.view_right);
         leftFr = (Left) getSupportFragmentManager().findFragmentById(
                 R.id.view_left);
 
     }
 
     public void setColor(int leftColor, int rightColor) {
 
         // for landscape mode
         if ((rightFr != null) && rightFr.isInLayout() && (leftFr != null)
                 && leftFr.isInLayout()) {
 
             LEFT.setBackgroundColor(leftColor);
             RIGHT.setBackgroundColor(rightColor);
         } else {
             // for portrait mode
             RIGHT.setBackgroundColor(rightColor);
 
         }
 
     }
 
     public void setSize(float leftsize, float rightsize) {
 
         // for landscape mode
         if ((rightFr != null) && rightFr.isInLayout() && (leftFr != null)
                 && leftFr.isInLayout()) {
 
             android.widget.LinearLayout.LayoutParams par1 = (LayoutParams) LEFT
                     .getLayoutParams();
 
             android.widget.LinearLayout.LayoutParams par2 = (LayoutParams) RIGHT
                     .getLayoutParams();
             par1.weight = rightsize;
             par2.weight = leftsize;
 
         }
 
     }
 
     // a method to add view in a blank xml programatically
     public void setView(View leftView, View rightView) {
         if ((rightFr != null) && rightFr.isInLayout() && (leftFr != null)
                 && leftFr.isInLayout()) {
             leftfragmentln.addView(leftView);
             rightfragmentln.addView(rightView);
         } else {
 
             rightfragmentln.addView(rightView);
 
         }
     }
 
     @Override
     public void onClickButton(String s) {
 
         if ((rightFr != null) && rightFr.isInLayout()) {
             rightFr.setText(s);
         } else {
             Intent intent = new Intent(this, RightActivity.class);
             intent.putExtra("value", s);
             startActivity(intent);
         }
 
     }
 
 }
 

I have made above code as a library and trying to use in my another project where i can use the above methods. What should I do? Plz Help

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