onNavigationItemSelected 从未调用 Actionbar 的微调器 [英] onNavigationItemSelected never called on Actionbar's spinner
问题描述
我正在尝试根据开发示例在 Action Bar Compat 中构建下拉菜单:http://developer.android.com/guide/topics/ui/actionbar.html#Dropdown
I'm trying to build a drop down menu in the Action Bar Compat, as per the dev example: http://developer.android.com/guide/topics/ui/actionbar.html#Dropdown
我无法让 onNavigationItemSelected 触发.
I can't get onNavigationItemSelected to fire though.
正在生成操作栏中的微调下拉项,位于操作栏标题的右侧.当我按下它时,我确实看到三角形图标变成蓝色.OnNavigationListener 和 Sting[]strings 正在 OnCreate 中运行.
The spinner dropdown item in the action bar is being generated, to the right of the actionbar's Title. When I press it I do see the triangle icon turn blue. The OnNavigationListener and Sting[]strings are being ran in OnCreate.
我如何让它发挥作用?
public class Main extends ActionBarActivity {
private ActionBar actionBar;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
actionBar = getActionBar();
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_LIST);
spinner = new Spinner(this);
SpinnerAdapter mSpinnerAdapter = ArrayAdapter.createFromResource(this,
R.array.operating_systems, android.R.layout.simple_spinner_dropdown_item);
spinner.setAdapter(mSpinnerAdapter);
ActionBar.OnNavigationListener mOnNavigationListener = new ActionBar.OnNavigationListener() {
String[] strings = getResources().getStringArray(R.array.operating_systems);
@Override
public boolean onNavigationItemSelected(int position, long itemId) {
ListContentFragment newFragment = new ListContentFragment();
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
ft.replace(R.id.fragment_container, newFragment, strings[position]);
ft.commit();
return true;
}
};
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.main, menu);
return super.onCreateOptionsMenu(menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.action_share:
Toast.makeText(this, "Refresh selected", Toast.LENGTH_SHORT)
.show();
break;
case R.id.action_settings:
Toast.makeText(this, "Settings selected", Toast.LENGTH_SHORT)
.show();
break;
default:
break;
}
return true;
}
}
推荐答案
看起来不像是在调用 ActionBar.setListNavigationCallbacks
.
Doesn't look like you're calling ActionBar.setListNavigationCallbacks
.
来自示例中的步骤 4:
使用 setListNavigationCallbacks() 设置下拉列表的回调.例如:
Set the callback for the drop-down list with setListNavigationCallbacks(). For example:
actionBar.setListNavigationCallbacks(mSpinnerAdapter, mNavigationCallback);
这篇关于onNavigationItemSelected 从未调用 Actionbar 的微调器的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!