我在片段交易方面遇到了一些小错误。当我打开多个片段并按后退按钮并且工具栏上显示的标题错误时,会出现问题。
例如,从我的Home -> Expenses fragment
,我按下费用片段中的后退按钮,工具栏上显示的标题是正确的。
但是,让我们说Home -> Expenses -> Incomes fragment
,然后我按下Incomes片段的后退按钮,它将返回Home片段,但工具栏上显示的标题将是'Expenses'而不是'Home'。
这是我为MainActivity设置的,它扩展了AppCompatActivity:
// inside onCreate() put all these code
//Setting Navigation View Item Selected Listener to handle the item click of the navigation menu
navigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
// This method will trigger on item Click of navigation menu
@Override
public boolean onNavigationItemSelected(MenuItem menuItem) {
//Checking if the item is in checked state or not, if not make it in checked state
if(menuItem.isChecked()) menuItem.setChecked(false);
else menuItem.setChecked(true);
//Closing drawer on item click
drawerLayout.closeDrawers();
//Check to see which item was being clicked and perform appropriate action
final Bundle bundle = new Bundle();
switch (menuItem.getItemId()){
case R.id.home:
getSupportActionBar().setTitle("Home");
return true;
case R.id.expenses:
return true;
case R.id.incomes:
return true;
case R.id.history:
return true;
case R.id.setting:
return true;
}
}
});
然后在我的每个片段中扩展Fragment,我设置标题并覆盖后退按钮:
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.activity_expense,container,false);
((AppCompatActivity)getActivity()).getSupportActionBar().setTitle("Expenses");
// override on back key pressed back to main fragment
v.setFocusableInTouchMode(true);
v.requestFocus();
v.setOnKeyListener(new View.OnKeyListener() {
@Override
public boolean onKey(View v, int keyCode, KeyEvent event) {
if( keyCode == KeyEvent.KEYCODE_BACK ) {
getFragmentManager().popBackStack(null, FragmentManager.POP_BACK_STACK_INCLUSIVE);
((AppCompatActivity)getActivity()).getSupportActionBar().setTitle("Home");
return true;
} else {
return false;
}
}
});
return v;
}
我甚至添加了这一行((AppCompatActivity)getActivity()).getSupportActionBar().setTitle("Home");
来设置后退按钮点击时的标题,但这是徒劳的。
答案 0 :(得分:-1)
以这种方式尝试:1。在您的活动中覆盖onBackPress:
@Override public void onBackPressed() {
if (count == 0) {
super.onBackPressed();
}
else {
getSupportFragmentManager().popBackStack(null,FragmentManager.POP_BACK_STACK_INCLUSIVE);
}
}
答案 1 :(得分:-1)
((AppCompatActivity)getActivity())。getSupportActionBar()。setTitle(" fragment title"); 只需将此行放在onCreateView()片段中即可。
并且不要覆盖片段中的后退按钮,在活动中覆盖它。