How to open Menu Context Android with click button in listview adapter?

Use like this:

act_komentar.setOnClickListener(new android.view.View.OnClickListener() {

    public void onClick(View v) {
        //To register the button with context menu.
        registerForContextMenu(act_komentar);
        openContextMenu(act_komentar);

    }
});

final int CONTEXT_MENU_VIEW = 1;
final int CONTEXT_MENU_EDIT = 2;
final int CONTEXT_MENU_ARCHIVE = 3;
@Override
public void onCreateContextMenu (ContextMenu menu, View
v, ContextMenu.ContextMenuInfo menuInfo){
    //Context menu
    menu.setHeaderTitle("My Context Menu");
    menu.add(Menu.NONE, CONTEXT_MENU_VIEW, Menu.NONE, "Add");
    menu.add(Menu.NONE, CONTEXT_MENU_EDIT, Menu.NONE, "Edit");
    menu.add(Menu.NONE, CONTEXT_MENU_ARCHIVE, Menu.NONE, "Delete");
}

@Override
public boolean onContextItemSelected (MenuItem item){
    // TODO Auto-generated method stub
    switch (item.getItemId()) {
        case CONTEXT_MENU_VIEW: {

        }
        break;
        case CONTEXT_MENU_EDIT: {
            // Edit Action

        }
        break;
        case CONTEXT_MENU_ARCHIVE: {

        }
        break;
    }

    return super.onContextItemSelected(item);
}

Output:

Hope this will work for you.

The accepted answer is really not optimal - it may simply be dated.

button.setOnCreateContextMenuListener((menu, v, menuInfo) -> {
    final MenuItem item = menu.add("item-text");
    item.setOnMenuItemClickListener(i -> {
        doWorkOnItemClick();
        return true; // Signifies you have consumed this event, so propogation can stop.
    });
    final MenuItem anotherItem = menu.add("another-item");
    anotherItem.setOnMenuItemClickListener(i -> doOtherWorkOnItemClick());
});
button.setOnClickListener(View::showContextMenu);

Alternatively you can show the context menu in a specific location like so:

button.setOnClickListener(view -> view.showContextMenu(x, y));