Question

我试图在片段中的textview中设置日期。问题是，在选择日期并单击对话框的确定按钮后，它不会立即将日期设置为textview。再次单击设置日期按钮时，在文本视图中设置日期时即可。

ButtonFragment

public class ButtonFragment extends Fragment {

Button date;
TextView datetext;
Date dateInterface;

@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.button_fragment, container, false);
    date = (Button) view.findViewById(R.id.date);
    datetext = (TextView) view.findViewById(R.id.datetext);
    date.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            dateInterface.setDate(datetext);
        }
    });
    datetext = (TextView) view.findViewById(R.id.datetext);
    return view;
}

@Override
public void onAttach(Activity activity) {
    super.onAttach(activity);
    try{
        dateInterface = (Date) activity;
    }catch(Exception e) {

    }
}

public interface Date{

    public void setDate(TextView textView);

 }
}

MainActivity

public class MainActivity extends AppCompatActivity implements ButtonFragment.Date {

Calendar c = Calendar.getInstance();
TextView display;
int cday, cmonth, cyear;
String date;

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

    FragmentManager fragmentManager = getFragmentManager();
    FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
    ButtonFragment buttonFragment = new ButtonFragment();
    fragmentTransaction.add(R.id.fragment_container, buttonFragment);
    fragmentTransaction.commit();
}

public void setDate(String date) {
    this.date = date;
}

public String getDate() {
    return this.date;
}

DatePickerDialog.OnDateSetListener d = new OnDateSetListener() {

    @Override
    public void onDateSet(DatePicker view, int year, int monthOfYear,
                          int dayOfMonth) {

        cday = dayOfMonth;
        cmonth = monthOfYear + 1;
        cyear = year;

    }
};

@Override
public void setDate(TextView textView) {
    new DatePickerDialog(MainActivity.this, d,
            c.get(Calendar.YEAR), c.get(Calendar.MONTH), c
            .get(Calendar.DAY_OF_MONTH)).show();


    date = "Choosen date is :" + cday + "/" + cmonth + "/"
            + cyear;

    textView.setText(date);
 }
}

Answer 1

更改代码如下

DatePickerDialog.OnDateSetListener d = new OnDateSetListener() {

@Override
public void onDateSet(DatePicker view, int year, int monthOfYear,
                      int dayOfMonth) {

    cday = dayOfMonth;
    cmonth = monthOfYear + 1;
    cyear = year;
    date = "Choosen date is :" + cday + "/" + cmonth + "/"
        + cyear;

    txtNow.setText(date);// set the text using the global pointer

    }
};

TextView txtNow;// this will be global pointer to the textView passed

@Override
public void setDate(TextView textView) {
txtNow = textView;// initilize the Global pointer
new DatePickerDialog(MainActivity.this, d,
        c.get(Calendar.YEAR), c.get(Calendar.MONTH), c
        .get(Calendar.DAY_OF_MONTH)).show();
}

现在应该可以使用

Answer 2

我将简单回答一下，只需在onViewCreated / onCreateView等任何方法之外使用它们。例如：将这些方法添加为类/片段的公共/私有/受保护方法之一：

DatePickerDialog.OnDateSetListener d = new OnDateSetListener() {

@Override
public void onDateSet(DatePicker view, int year, int monthOfYear,
                  int dayOfMonth) {

txtNow.setText(year + "/" + monthOfYear+1 "/" + dayOfMonth);// set the text using the global pointer

}
};

Android DatePicker在第一次尝试时未在textview中设置日期

2 个答案: