Cannot display Toast from an Activity other than my main activity

问题

I have a Activity called main. If I call

Toast.makeText(this, "Hello World from main", Toast.LENGTH_SHORT);

this works fine. However, for every other activity in my application, I cannot display a Toast. No exception, nothing in the Log but I don't see the Toast.

My main activity starts another one with an options menu:

@Override
public boolean onOptionsItemSelected(MenuItem item) {

    switch (item.getItemId()) {

    case R.id.main_menu_entry:

        Intent infolist = new Intent(this, infolist.class);
        startActivityForResult(infolist, R.layout.infolist);

        return true;
    default:
        return super.onOptionsItemSelected(item); 
    }
}

In my infolist activity I have another options menu which should display a Toast.

@Override
public boolean onOptionsItemSelected(MenuItem item) {

    switch (item.getItemId()) {
    case R.id.infolist_menu_entry:

                    // this Toast is never shown.
        Toast.makeText(this, "Hello World from infolist", Toast.LENGTH_Short);          
        return true;

    default:
        return super.onOptionsItemSelected(item); 
    }
}

Any ideas what could cause this issue? I am using the latest SDK with Min SDK Version = 3 and an 1.5 Emulator.

回答1:

I would say, classical error :
You forgot the Toast.show() method ;)

回答2:

You miss the show() method at the end.

Toast.makeText(this, "Hello World from infolist", Toast.LENGTH_Short).show();

来源：https://stackoverflow.com/questions/3466087/cannot-display-toast-from-an-activity-other-than-my-main-activity