Question

我想在我的活动的操作栏中使用微调器是onCreateOptionsMenu：我使用this tutorial来实现这种方法。我的问题是当活动是午餐时，onNavigationItemSelected方法触发，并且交换机/案例上的代码运行，我为位置0设置的活动打开。我应该怎么做才能防止在活动午餐时运行开关/案例？

@Override
public boolean onCreateOptionsMenu(Menu menu) {

    getSupportMenuInflater().inflate(R.menu.main, menu);

    SpinnerAdapter mSpinnerAdapter;
    if(Build.VERSION.SDK_INT <= 10)
    {
        mSpinnerAdapter = ArrayAdapter.createFromResource(this, R.array.spinner_data,android.R.layout.simple_spinner_item);
    }
    else
    {
        mSpinnerAdapter = ArrayAdapter.createFromResource(this, R.array.spinner_data,android.R.layout.simple_spinner_dropdown_item);
    }
    ActionBar.OnNavigationListener mOnNavigationListener = new ActionBar.OnNavigationListener()
    {
        @Override
        public boolean onNavigationItemSelected(int position, long itemId)
        {
            switch (position)
            {
                case 0:
                    Intent searchIntent = new Intent(ActivitySearchBusiness.this, ActivityFindBusinessCity.class);
                    startActivity(searchIntent);
                    break;
                case 2:
                    Intent dealsIntent = new Intent(ActivitySearchBusiness.this, ActivityDeals.class);
                    startActivity(dealsIntent);
                    break;
                case 3:
                    Intent eventsIntent = new Intent(ActivitySearchBusiness.this, ActivityEvents.class);
                    startActivity(eventsIntent);
                    break;
            }

            return true;
        }
    };
    actionBar.setListNavigationCallbacks(mSpinnerAdapter, 

    return super.onCreateOptionsMenu(menu);
}

Answer 1

onCreateOptionsMenu(Menu)：

中不需要以下代码

.... ....

将其删除并将其放入活动的onCreate(Bundle)方法。

修改

声明全局boolean变量：

boolean initializing = true;

将以下代码放在onCreate(Bundle)：
中
SpinnerAdapter mSpinnerAdapter; if(Build.VERSION.SDK_INT <= 10) { mSpinnerAdapter = ArrayAdapter.createFromResource(this, R.array.spinner_data,android.R.layout.simple_spinner_item); } else { mSpinnerAdapter = ArrayAdapter.createFromResource(this, R.array.spinner_data,android.R.layout.simple_spinner_dropdown_item); } ActionBar.OnNavigationListener mOnNavigationListener = new ActionBar.OnNavigationListener() { @Override public boolean onNavigationItemSelected(int position, long itemId) { if (initializing) { initializing = false; } else { switch (position) { case 0: Intent searchIntent = new Intent(ActivitySearchBusiness.this, ActivityFindBusinessCity.class); startActivity(searchIntent); break; case 2: Intent dealsIntent = new Intent(ActivitySearchBusiness.this, ActivityDeals.class); startActivity(dealsIntent); break; case 3: Intent eventsIntent = new Intent(ActivitySearchBusiness.this, ActivityEvents.class); startActivity(eventsIntent); break; } } return true; } }; //actionBar.setListNavigationCallbacks(mSpinnerAdapter, mOnNavigationListener); getActionBar().setListNavigationCallbacks(mSpinnerAdapter, mOnNavigationListener);

启动活动时如何防止onNavigationItemSelected触发？

1 个答案: