There are a few things you can do for example:

getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_HIDDEN);

Or

<activity
        ...
        android_windowSoftInputMode="stateHidden|adjustPan"
        ...
        >

Another thing to try

<style name="MyTheme" parent="Theme">
    <item name="android:windowSoftInputMode">stateHidden</item>
</style>

<application android_theme="@style/MyTheme">

Add these two properties to your parent layout (ex: Linear Layout, Relative Layout)

android:focusable="false"
android_focusableInTouchMode="false" 

Because your widget(com.pchmn.materialchips.ChipsInput) is the first widget in Activity, there is a focus on this widget.

To solve this problem, you need to turn off the focus so that the keyboard does not open when the activity starts

InputMethodManager imm = (InputMethodManager)getSystemService(Context.INPUT_METHOD_SERVICE);
imm.hideSoftInputFromWindow(editTextField.getWindowToken(), 0);

Manifest in tag current activity:

android:windowSoftInputMode="stateHidden"

I’m using MaterialChipsInput. I have the following code:

<LinearLayout
    android_layout_width="match_parent"
    android_layout_height="wrap_content"
    android_layout_below="@id/tile_divider2"
    android_orientation="vertical">

    <TextView
        android_id="@+id/text1"
        android_layout_width="wrap_content"
        android_layout_height="wrap_content"
        android_text="@string/header" />

    <com.pchmn.materialchips.ChipsInput
        android_id="@+id/chips1"
        android_layout_width="match_parent"
        android_layout_height="wrap_content"
        app_chip_backgroundColor="@color/primaryColor"
        app_chip_deletable="true"
        app_chip_hasAvatarIcon="false"
        app_chip_labelColor="@color/whiteColor"
        app_showChipDetailed="false"
        app_hint="@string/hint" />

</LinearLayout>

And the java code is:

        chipsInput = (ChipsInput) findViewById(R.id.chips1);
        chipsInput.addChipsListener(new ChipsInput.ChipsListener() {
            @Override
            public void onChipAdded(ChipInterface chip, int newSize) {}

            @Override
            public void onChipRemoved(ChipInterface chip, int newSize) {}

            @Override
            public void onTextChanged(CharSequence text) {
                if (text != null && text.toString().contains(" ") && text.toString().length() > 1) {
                    final String tag = StringUtils.capitalizeFully(text.toString().replaceAll(" ","").trim());
                    if (!(tag.isEmpty())) {
                        chipsInput.addChip(tag, null);
                    }
                }
            }
        });

For some reason, when I move to the activity and it loads the layout with that component, it automatically opens a keyboard on the ChipsInput. What could be the reason and how to prevent it?