我正在使用(下面的链接)日期选择器从用户中选择日期,选择后我想更新我的文本框(编辑文本),但它给了我“非静态方法 findviewbyid int 无法从静态上下文引用”错误 任何人都可以建议我做同样事情的任何其他方法或此方法中的任何错误吗?
https://developer.android.com/guide/topics/ui/controls/pickers.html
public void onDateSet(DatePicker view, int year, int month, int day) {
// Do something with the date chosen by the user
String myFormat = "yyyy-MM-dd";
SimpleDateFormat sdf = new SimpleDateFormat(myFormat, Locale.US);
((EditText) findViewById(R.id.ev_Date)).setText(sdf.format(usercalendar.getTime()));
}
这就是我的全部代码
public class CreateReport extends AppCompatActivity {
public EditText EventDate;
private static Calendar usercalendar;
private String Lat, Long;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_create_report);
// final ActionBar ab = getSupportActionBar();
// ab.setTitle("Create Reoprt");
Bundle bundle = getIntent().getExtras();
EventDate = (EditText) findViewById(R.id.ev_Date);
if (bundle != null) {
Lat = bundle.getString("lat");
Toast.makeText(getContext(), "Latitude" + Lat, Toast.LENGTH_LONG).show();
Long = bundle.getString("Long");
}
}
public void showDatePickerDialog(View v) {
DialogFragment newFragment = new DatePickerFragment();
newFragment.show(getSupportFragmentManager(), "datePicker");
}
public static class DatePickerFragment extends DialogFragment
implements DatePickerDialog.OnDateSetListener {
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
// Use the current date as the default date in the picker
final Calendar c = Calendar.getInstance();
int year = c.get(Calendar.YEAR);
int month = c.get(Calendar.MONTH);
int day = c.get(Calendar.DAY_OF_MONTH);
// Create a new instance of DatePickerDialog and return it
return new DatePickerDialog(getActivity(), this, year, month, day);
}
public void onDateSet(DatePicker view, int year, int month, int day) {
// Do something with the date chosen by the user
String myFormat = "yyyy-MM-dd";
SimpleDateFormat sdf = new SimpleDateFormat(myFormat, Locale.US);
// ((EditText) findViewById(R.id.ev_Date)).setText(sdf.format(usercalendar.getTime()));
// EventDate.setText(sdf.format(usercalendar.getTime()));
//Unaccesable
}
}
您不能在findViewById
方法中执行
onDateSet()
您需要在findViewById
)方法中执行
onCreate(
示例
public class MainActivity extends AppCompatActivity {
// decalre your EditText Global
EditText edtDate;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// do findViewById inside oncraeate
edtDate = findViewById(R.id.ev_Date);
}
}
现在像这样在
onDateSet()
内部使用
// when ever u want to set text in EditText edtDate just use like this
edtDate.setText(sdf.format(usercalendar.getTime()));
在调用方法之前你还没有创建对象,所以非静态方法还不存在。
您可以使用类型是(WebView)和(getView)
WebView mywebview = (WebView) getView().findViewById(R.id.webViewName);