你就算用 intent传 里面也会自动生成一个bundle的。
所以实际上都是用bundle

一楼已经回答的很正确了，我只是贴出个源码来：

    /**
     * Add extended data to the intent.  The name must include a package
     * prefix, for example the app com.android.contacts would use names
     * like "com.android.contacts.ShowAll".
     *
     * @param name The name of the extra data, with package prefix.
     * @param value The String data value.
     *
     * @return Returns the same Intent object, for chaining multiple calls
     * into a single statement.
     *
     * @see #putExtras
     * @see #removeExtra
     * @see #getStringExtra(String)
     */
    public Intent putExtra(String name, String value) {
        if (mExtras == null) {
            mExtras = new Bundle();
        }
        mExtras.putString(name, value);
        return this;
    }

好像是bundle能传递的数据类型多？