英文:
How to set a String value in the spinner without ArrayList in Android?
问题
用户位置已保存在数据库中。在这里，我正在从数据库中检索州和城市，然后保存在字符串中。这部分没问题。现在，我该如何将州的字符串值设置在一个下拉列表中，然后将城市的字符串值设置在第二个下拉列表中？
String state = "prov";
String city = "cityy";
当我尝试以下操作时：
ArrayAdapter<String> adaptersta = new ArrayAdapter<String>(uploadpostj.this, android.R.layout.simple_spinner_item, Collections.singletonList(state));
spinnerstate.setAdapter(adaptersta);
以及
ArrayAdapter<String> adaptercityy = new ArrayAdapter<String>(uploadpostj.this, android.R.layout.simple_spinner_item, Collections.singletonList(city));
spinnercity.setAdapter(adaptercityy);
当我只尝试设置城市值时，一切正常，或者只尝试设置州值，同样没问题。然而，当我尝试同时设置两个值时，只有州的值被设置，而城市为空。我如何在两个下拉列表中都设置这两个字符串值？
英文:
Users location is already saved in database. Here, Im retrieving state and city from database, then saved in strings. That is ok. Now, how can I set state string value in a spinner and then city string value in a 2nd spinner?
String state = "prov";
String city = "cityy";
When I try
ArrayAdapter<String> adaptersta = new ArrayAdapter<String>(uploadpostj.this, android.R.layout.simple_spinner_item, Collections.singletonList(state));
spinnerstate.setAdapter(adaptersta);
and
ArrayAdapter<String> adaptercityy = new ArrayAdapter<String>(uploadpostj.this, android.R.layout.simple_spinner_item, Collections.singletonList(city));
spinnercity.setAdapter(adaptercityy);
Then if I just try to set only city value, then it's ok, or try to set only state value, again ok. However, when I try to set both values, then only state value is set and city is empty. How can I set both string values in both spinners?
答案1
得分: 0
用户选择状态后，您应将该状态的城市添加到该状态的数组列表中，并在城市下拉列表中显示。
英文:
After state is selected by user, you should add cities of that state to arraylist of that state and show it in city spinner.
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