android 操作栏 onNavigationItemSelected

Question

我正在为 android 3+ 开发

在我的操作栏中，我有一个下拉列表(请参阅 how to hide/unhide the actionbar list on android 3? 了解我想要的下拉列表)。问题是我需要在用户选择某些内容时执行特定操作，但 Android 在绘制 View 后立即调用 onNavigationItemSelected()，因此实际上没有发生任何选择。

我如何检测用户是否真的按下了某些东西并且它不是来自 android 的虚假调用？

public class ListDittaListener implements OnNavigationListener{

    private BaseActivity activity;

    private ListDittaListener()
    {

    }

    public ListDittaListener(BaseActivity activity)
    {
        this.activity = activity;
    }

    @Override
    public boolean onNavigationItemSelected(int itemPosition, long itemId)
    {
        MyApp appState = ((MyApp)this.activity.getApplicationContext());
        appState.setDittaSelezionata( (int) itemId);

        SharedPreferences settings = this.activity.getSharedPreferences(MyApp.PREFS_NAME, 0);
        SharedPreferences.Editor editor = settings.edit();
        editor.putInt("ditta_id_selezionata", (int) itemId);

            ////////restart activity this.activity.recreate();

        return false;
    }

}

Answer 1

如果您愿意，您可以轻松地忽略对 onNavigationItemSelected 的第一次调用:

public class Whatever implements OnNavigationListener {
    private boolean synthetic = true;

    @Override
    public boolean onNavigationItemSelected(int itemPosition, long itemId) {
        if (synthetic) {
            synthetic = false;
            return true;
        }

        // do whatever you really wanted here 
    }
}