<menu xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:app="http://schemas.android.com/apk/res-auto"

    xmlns:tools="http://schemas.android.com/tools"

    tools:context=".MainActivity">

    <item

        android:id="@+id/setting"

        android:icon="@mipmap/account_user_setting"

        android:title="设置"

        app:showAsAction="ifRoom" />

</menu>

 @Override

    public boolean onOptionsItemSelected(MenuItem item) {

        if (item.getItemId() == R.id.save) {return true;

        }

        return super.onOptionsItemSelected(item);

    }

    @Override

    public boolean onCreateOptionsMenu(Menu menu) {

        getMenuInflater().inflate(R.menu.account_menu_refund_expressage, menu);

        return true;

    }

 new MenuInflater(this).inflate(R.menu.account_menu_refund_expressage, menu);