Here is an example of how to pass custom objects between activities in android. You may use a static class to hold objects, which is fine, but you can also do it the "Android" way by making your classes Parcelable. Feel free to use this code as you please.

OtherActivity

OtherActivity

activity_other.xml

<LinearLayout
    android:id="@+id/layout_other_activity"
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
    tools:context=".OtherActivity"
    android:orientation="vertical">

  
</LinearLayout>

activity_passing_objects.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
    tools:context=".MainActivity">

    <Button
        android:id="@+id/button_pass"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Pass Objects"
        android:layout_centerInParent="true"
        />

</RelativeLayout>

OtherActivity.java

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.widget.LinearLayout;
import android.widget.TextView;
import java.util.ArrayList;

public class OtherActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_other);
        LinearLayout layout = (LinearLayout)findViewById(R.id.layout_other_activity);

        ArrayList<SomeObject> someObjects = getIntent().getParcelableArrayListExtra(SomeObject.TYPE);

        if (someObjects != null) {
            for (SomeObject someObject : someObjects) {
                TextView textView = new TextView(this);
                textView.setText( someObject.someString + " " + someObject.someInt + " " + someObject.someDouble );
                layout.addView(textView);
            }
        }
    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.other, menu);
        return true;
    }
    
}

PassingObjectsActivity.java

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import java.util.ArrayList;

public class PassingObjectsActivity extends Activity implements View.OnClickListener 
{
    private ArrayList<SomeObject> someObjects;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        someObjects = new ArrayList<SomeObject>();
        someObjects.add(new SomeObject("object_0", 0, 0.0));
        someObjects.add(new SomeObject("object_1", 1, 1.1));
        someObjects.add(new SomeObject("object_2", 2, 2.2));
        someObjects.add(new SomeObject("object_3", 3, 3.3));
        someObjects.add(new SomeObject("object_4", 4, 4.4));
        someObjects.add(new SomeObject("object_5", 5, 5.5));
        someObjects.add(new SomeObject("object_6", 6, 6.6));

        findViewById(R.id.button_pass).setOnClickListener(this);
    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public void onClick(View view) {
        switch (view.getId()) {
            case R.id.button_pass:
                Intent intent = new Intent(this, OtherActivity.class);
                intent.putParcelableArrayListExtra(SomeObject.TYPE, someObjects);
                startActivity(intent);
            break;
        }
    }
}

SomeObject.java

import android.os.Parcel;
import android.os.Parcelable;

public class SomeObject implements Parcelable
{
    public String someString = "";
    public int someInt = 0;
    public double someDouble = 0.0;

    public static String TYPE = "someObject";

    public SomeObject(String s, int i, double d)
    {
        someString = s;
        someInt    = i;
        someDouble = d;
    }

    public SomeObject(Parcel in)
    {
        //read in same order that you wrote in writeToParcel
        someString = in.readString();
        someInt    = in.readInt();
        someDouble = in.readDouble();
//      reading in a list custom objects: in.readTypedList(someCustomObjectArrayList, someCustomObject.CREATOR )

    }

    @Override
    public void writeToParcel(Parcel out, int i)
    {
        //this is the order you should read in your contructor
        out.writeString(someString);
        out.writeInt(someInt);
        out.writeDouble(someDouble);
//      writing some custom object: out.writeTypedList(someCustomObjectArrayList);

    }

    @Override
    public int describeContents() {
        return 0;
    }

    //for arrays and creating from a parcel
    public static final Parcelable.Creator<SomeObject> CREATOR = new Parcelable.Creator<SomeObject>() {
        public SomeObject createFromParcel(Parcel in) {
            return new SomeObject(in);
        }
        public SomeObject[] newArray(int size) {
            return new SomeObject[size];
        }
    };
}