Android Spinner - How to position dropdown arrow as close to text as possible when options have different length?

Question

The options in my spinner has different length and currently the dropdown arrow is positioned far to the right based on the longest option, as shown in the screenshot below.

Answer 1

Translating @尹小雨 answer to java

    ArrayAdapter adapter = new ArrayAdapter<Category>(this,R.layout.spinner_item_main,objects); // creates new ArrayAdapter with custom textviews for all elements including the first one (which is what we want)
    adapter.setDropDownViewResource(R.layout.spinner_dropdown_view_main); // Modifies all the elements when you click on the dropdown
    spinner.setAdapter(adapter); // sets the adapter to the spinner

Answer 2

You cannot control the position of the original dropdown icon, the only way is to disable the default icon and add your own one into the dropdown.

First, disable the default dropdown icon by setting the background of the Spinner to @null:

<Spinner
     android:id="@+id/spinner_main"
     android:spinnerMode="dropdown"
     android:background="@null"
     android:layout_width="wrap_content"
     android:layout_height="match_parent"/>

Then create a layout resource spinner_item_main.xml with only one TextView which we can set a drawable on its right side (you can download the arrow picture from here):

<TextView
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textSize="20sp"
    android:textStyle="bold"
    android:gravity="left"
    android:textColor="@color/colorWhite"
    android:drawableRight="@drawable/ic_arrow_drop_down_white_24dp"
    />

Finally Set this layout resource when you initialize the Spinner, You can also provide a resource as the dropdown view (as what I have done):

(I use kotlin)

spinner_main.adapter = ArrayAdapter<String>(this,
            R.layout.spinner_item_main, objects).apply {
        setDropDownViewResource(R.layout.spinner_dropdown_view_main)
    }

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