是否可以在Android中的onCreate()
方法之前创建变量?我过去曾尝试这样做,但没有用,所以我假设你不能,但我只想仔细检查。原因是因为我试图访问我TextWatcher
中作为计数器的变量,但是它超出范围并要求我将其作为最终,这显然不起作用,因为它作为一个计数器和需要增加。我在下面附上了我的代码:
int counter = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final EditText answerText = (EditText) findViewById(R.id.answer);
final TextView text = (TextView) findViewById(R.id.wordtoanswer);
final ArrayList updatedList = helperMethod();
text.setText(updatedList.get(0).toString());
final String wordFinal = updatedList.get(0).toString();
while(true)
{
answerText.addTextChangedListener(new TextWatcher() {
public void onTextChanged(CharSequence s, int start, int before, int count) {
// TODO Auto-generated method stub
}
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
// TODO Auto-generated method stub
}
public void afterTextChanged(Editable s) {
System.out.println(counter);
String answer = s.toString();
if(answer.equals(wordFinal))
{
text.setText(updatedList.get(counter).toString());
answerText.setText("");
}
}
});
counter++;
}
}
希望你们理解我为什么要在onCreate()
之前声明它,因为只有这样,TextWatcher
内的方法才能实际访问它而不会超出范围。无论如何我可以解决这个问题吗?如果您需要更多信息/代码,请告诉我们!
答案 0 :(得分:2)
将引用声明为成员变量:
private TextView text;
在OnCreate方法中实例化它:
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
text = (TextView) findViewById(R.id.wordtoanswer);
//...
}