Question

我是Java新手，并尝试使用EditText创建活动。在创建时，它使用当前日期加载，当用户选择EditText时，它会显示DatePicker。一旦用户选择了日期，我需要将结果放入EditText。但是，我目前收到以下错误：

无法从类型Activity
中对非静态方法findViewById（int）进行静态引用

我知道我无法对非静态方法进行静态引用。我试图删除所有静态引用，但这给了我其他错误。我的代码如下。

你能帮我一些关于如何使这项工作的示例代码吗？错误是在我尝试将结果放入EditText的位置。

public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    //Get Current Date and assign to EditText Begin
    Calendar c = Calendar.getInstance();
    System.out.println("Current time => " + c.getTime());

    SimpleDateFormat df = new SimpleDateFormat("MM/dd/yyyy", Locale.US);
    String formattedDate = df.format(c.getTime());

    EditText ShowDate = (EditText) findViewById(R.id.editTextToShowDate);
    ShowDate.setText(formattedDate);
    //Get Current Date and assign to EditText End
}

//Date Picker Start
@TargetApi(Build.VERSION_CODES.HONEYCOMB) public void showDatePickerDialog(View v) {
    DialogFragment newFragment = new DatePickerFragment();
    newFragment.show(getFragmentManager(), "datePicker");
}    

@TargetApi(Build.VERSION_CODES.HONEYCOMB) public static class DatePickerFragment extends DialogFragment
implements DatePickerDialog.OnDateSetListener {

@TargetApi(Build.VERSION_CODES.HONEYCOMB) @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 sToDate = createStringFromDateElements(year, month, day);
    EditText ShowDate = (EditText) findViewById(R.id.editTextToShowDate);  //I get the error here
    ShowDate.setText(sToDate);  
}

private String createStringFromDateElements(int year, int month, int day) {
    // TODO Auto-generated method stub
    return null;
}
}
//Date Picker End

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.activity_main, menu);
    return true;
}
}

Answer 1

编辑：

EditText ShowDate = (EditText)getActivity(). findViewById(R.id.editTextToShowDate);

这会有用......

Answer 2

Inside Activity class, i have made editText as static and

EditText ShowDate = (EditText)this.findViewById(R.id.editTextToShowDate);

It worked for me.

For more here

的大小

错误：“无法从类型Activity中对非静态方法findViewById（int）进行静态引用”

2 个答案: