Custom SearchView whole clickable in android

Another simple way to do it by setting onActionViewExpanded().

searchView = (SearchView)findViewById(R.id.searchView);
searchView.setOnClickListener(new OnClickListener() {
    @Override
    public void onClick(View v) {
        searchView.onActionViewExpanded();
    }
});

By default the SearchView is 'iconified'. So you should use this code in java:

SearchView searchView = (SearchView) findViewById(R.id.searchView);
searchView.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        searchView.setIconified(false);
    }
});

or use this in xml:

<SearchView
        android:id="@+id/searchView"
        android:iconifiedByDefault="false" />

this 2 ways is correct, but different in icons display.

By default the SearchView is 'iconified', which is displayed as a magnifying glass icon and only if the user clicks on the icon, then the edit field expands.

To enable the user to click anywhere on the SearchView and expand the input field. We just need to add a click listener and call setIconified(false) when the user clicks.

searchView = (SearchView)findViewById(R.id.searchView);
searchView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            searchView.setIconified(false);
        }
    });