<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
    <item
        android:id="@+id/action_settings"
        android:title="@string/action_settings"
        android:icon="@drawable/ic_settings"
        android:showAsAction="ifRoom" />
    <item
        android:id="@+id/action_about"
        android:title="@string/action_about"
        android:showAsAction="never" />
</menu>

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.activity_menu, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
        case R.id.action_settings:
            // 处理点击事件
            return true;
        case R.id.action_about:
            // 处理点击事件
            return true;
        default:
            return super.onOptionsItemSelected(item);
    }
}