Fluent API for working with bundles.http://www.f2prateek.com/blog/2014/01/03/syntactical-sugar-bundler/

Bundler.java

package com.f2prateek.articuno.util;

import android.os.Bundle;
import android.os.IBinder;
import android.os.Parcelable;
import android.util.SparseArray;
import java.io.Serializable;
import java.util.ArrayList;

/**
 * Fluent API for {@link android.os.Bundle}
 * {@code Bundle bundle = new Bundler().put(....).put(....).get();}
 */
public class Bundler {

  private final Bundle bundle;
  
  // Construct a bundler
  public Bundler() {
    bundle = new Bundle();
  }
  
  /**
   * Use the provided bundle to back this Bundler.
   * The bundle that is passed will be modified directly.
   */
  public Bundler(Bundle bundle) {
    this.bundle = bundle;
  }

  public Bundler put(String key, boolean value) {
    bundle.putBoolean(key, value);
    return this;
  }

  public Bundler put(String key, boolean[] value) {
    bundle.putBooleanArray(key, value);
    return this;
  }

  public Bundler put(String key, IBinder value) {
    // Uncommment this line if your minimum sdk version is API level 18
    //bundle.putBinder(key, value);
    return this;
  }

  public Bundler put(String key, int value) {
    bundle.putInt(key, value);
    return this;
  }

  public Bundler put(String key, int[] value) {
    bundle.putIntArray(key, value);
    return this;
  }

  public Bundler putIntegerArrayList(String key, ArrayList<Integer> value) {
    bundle.putIntegerArrayList(key, value);
    return this;
  }

  public Bundler put(String key, Bundle value) {
    bundle.putBundle(key, value);
    return this;
  }

  public Bundler put(String key, byte value) {
    bundle.putByte(key, value);
    return this;
  }

  public Bundler put(String key, byte[] value) {
    bundle.putByteArray(key, value);
    return this;
  }

  public Bundler put(String key, String value) {
    bundle.putString(key, value);
    return this;
  }

  public Bundler put(String key, String[] value) {
    bundle.putStringArray(key, value);
    return this;
  }

  public Bundler putStringArrayList(String key, ArrayList<String> value) {
    bundle.putStringArrayList(key, value);
    return this;
  }

  public Bundler put(String key, long value) {
    bundle.putLong(key, value);
    return this;
  }

  public Bundler put(String key, long[] value) {
    bundle.putLongArray(key, value);
    return this;
  }

  public Bundler put(String key, float value) {
    bundle.putFloat(key, value);
    return this;
  }

  public Bundler put(String key, float[] value) {
    bundle.putFloatArray(key, value);
    return this;
  }

  public Bundler put(String key, char value) {
    bundle.putChar(key, value);
    return this;
  }

  public Bundler put(String key, char[] value) {
    bundle.putCharArray(key, value);
    return this;
  }

  public Bundler put(String key, CharSequence value) {
    bundle.putCharSequence(key, value);
    return this;
  }

  public Bundler put(String key, CharSequence[] value) {
    bundle.putCharSequenceArray(key, value);
    return this;
  }

  public Bundler putCharSequenceArrayList(String key, ArrayList<CharSequence> value) {
    bundle.putCharSequenceArrayList(key, value);
    return this;
  }

  public Bundler put(String key, double value) {
    bundle.putDouble(key, value);
    return this;
  }

  public Bundler put(String key, double[] value) {
    bundle.putDoubleArray(key, value);
    return this;
  }

  public Bundler put(String key, Parcelable value) {
    bundle.putParcelable(key, value);
    return this;
  }

  public Bundler put(String key, Parcelable[] value) {
    bundle.putParcelableArray(key, value);
    return this;
  }

  public Bundler putParcelableArrayList(String key, ArrayList<? extends Parcelable> value) {
    bundle.putParcelableArrayList(key, value);
    return this;
  }

  public Bundler putSparseParcelableArray(String key, SparseArray<? extends Parcelable> value) {
    bundle.putSparseParcelableArray(key, value);
    return this;
  }

  public Bundler put(String key, short value) {
    bundle.putShort(key, value);
    return this;
  }

  public Bundler put(String key, short[] value) {
    bundle.putShortArray(key, value);
    return this;
  }

  public Bundler put(String key, Serializable value) {
    bundle.putSerializable(key, value);
    return this;
  }

  public Bundler putAll(Bundle map) {
    bundle.putAll(map);
    return this;
  }

  /**
   * Get the underlying bundle.
   */
  public Bundle get() {
    return bundle;
  }
  
  /**
   * Copy the underlying bundle.
   */
  public Bundle copy() {
    return new Bundle(bundle);
  }
  
  /**
   * Initialize a Bundler that is copied form the given bundle. The bundle that is passed will not be modified.
   */
  public static Bundler copyFrom(Bundle bundle) {
    return new Bundler().putAll(bundle);
  }
}

Be careful with the mutability of the underlying object:

Bundler b = new Bundler().put("Foo", "Bar");
Bundle one = b.get();
b.put("Kit", "Kat");
Bundle two = b.get();

Perhaps offer a copy() convenience method?

Thanks for the tip, I've put in a copy() method.

@f2prateek why don't you put it in a project and distribute it via maven?