Android的动作栏onNavigationItemSelected [英] android action bar onNavigationItemSelected

问题描述

我正在开发Android版3 +

在我的行动吧，我有一个下拉列表（见<一href="http://stackoverflow.com/questions/9588810/how-to-hide-unhide-the-actionbar-list-on-android-3">how隐藏/取消隐藏动作条列表上的Andr​​oid 3.0？，在下拉我打算）。现在的问题是，我需要当用户选择的东西做了一定作用，但Android把onNavigationItemSelected（）作为soons，因为它吸引的观点，所以没有选择实际发生的情况。

我如何可以检测用户是否确实pressed东西，它不是来自Android的假通话？

 公共类ListDittaListener实现OnNavigationListener {

    私人BaseActivity活动;

    私人ListDittaListener（）
    {

    }

    公共ListDittaListener（BaseActivity活动）
    {
        this.activity =活动;
    }

    @覆盖
    公共布尔onNavigationItemSelected（INT itemPosition，长的itemId）
    {
        的MyApp appState =（（MyApp的）this.activity.getApplicationContext（））;
        appState.setDittaSelezionata（（INT）的itemId）;

        共享preferences设置= this.activity.getShared preferences（MyApp的preFS_NAME，0）;
        共享preferences.Editor编辑器= settings.edit（）;
        editor.putInt（ditta_id_selezionata，（INT）的itemId）;

            ////////重启活动this.activity.recreate（）;

        返回false;
    }

}
 

解决方案

您可以很容易地忽略到 onNavigationItemSelected 第一个电话，如果你喜欢：

公共类无论实现OnNavigationListener {     私人布尔合成= TRUE;     @覆盖     公共布尔onNavigationItemSelected（INT itemPosition，长的itemId）{         如果（合成）{             合成= FALSE;             返回true;         }         //做任何你真的想在这里     } }

I'm developing for android 3+

In my action bar i have a drop-down list(see how to hide/unhide the actionbar list on android 3? for the dropdown i intend). The problem is i need to do a certain action when the user selects something, but Android calls onNavigationItemSelected() as soons as it draws the view, so no selection actually happened.

How can i detect if the user actually pressed something and it is not a fake call from android ?

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;
    }

}

解决方案

You can easily just ignore the first call to onNavigationItemSelected if you like:

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 
    }
}

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