我正在尝试在列表导航模式下实现 Android 操作栏,当从列表中选择一个项目时,它成功更改片段,但片段重叠,当第二个是时,我可以在屏幕上看到前一个的内容选择。这是 Activity 的 OnCreate 和 OnNavigationItemSelected 的代码:
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
mFirstFragment = new FirstFragment();
mSecondFragment = new SecondFragment();
SpinnerAdapter mSpinnerAdapter = ArrayAdapter.createFromResource(
this,
R.array.action_list,
android.R.layout.simple_spinner_dropdown_item);
mActionBar = getActionBar();
mActionBar.setDisplayShowTitleEnabled(false);
mActionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_LIST);
mActionBar.setListNavigationCallbacks(mSpinnerAdapter, this);
if(savedInstanceState != null) {
mActionBar.setSelectedNavigationItem(
savedInstanceState.getInt("currFragment"));
}
}
public boolean onNavigationItemSelected(int position, long itemId) {
FragmentTransaction mFragmentTransaction =
getFragmentManager().beginTransaction();
switch(position) {
case FIRST_FRAGMENT:
mFragmentTransaction.replace(
android.R.id.content,
mFirstFragment);
break;
case SECOND_FRAGMENT:
mFragmentTransaction.replace(
android.R.id.content,
mSecondFragment);
break;
}
mFragmentTransaction.commit();
return true;
}
提前致谢!