import java.text.DateFormat; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Calendar;  import android.app.Activity; import android.app.AlertDialog; import android.content.DialogInterface; import android.os.Bundle; import android.view.LayoutInflater; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.EditText;  public class MainActivity extends Activity {  WheelMain wheelMain;  EditText txttime;  DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");   @Override  public void onCreate(Bundle savedInstanceState) {   super.onCreate(savedInstanceState);   setContentView(R.layout.main);   txttime = (EditText) findViewById(R.id.txttime);   Calendar calendar = Calendar.getInstance();   txttime.setText(calendar.get(Calendar.YEAR) + "-"     + (calendar.get(Calendar.MONTH) + 1) + "-"     + calendar.get(Calendar.DAY_OF_MONTH) + "");   Button btnselecttime = (Button) findViewById(R.id.button1);   btnselecttime.setOnClickListener(new OnClickListener() {     @Override    public void onClick(View arg0) {     LayoutInflater inflater = LayoutInflater       .from(MainActivity.this);     final View timepickerview = inflater.inflate(       R.layout.timepicker, null);     ScreenInfo screenInfo = new ScreenInfo(MainActivity.this);     wheelMain = new WheelMain(timepickerview, true);     wheelMain.screenheight = screenInfo.getHeight();     String time = txttime.getText().toString();     Calendar calendar = Calendar.getInstance();     if (JudgeDate.isDate(time, "yyyy-MM-dd")) {      try {       calendar.setTime(dateFormat.parse(time));      } catch (ParseException e) {       // TODO Auto-generated catch block       e.printStackTrace();      }     }     int year = calendar.get(Calendar.YEAR);     int month = calendar.get(Calendar.MONTH);     int day = calendar.get(Calendar.DAY_OF_MONTH);     int h = calendar.getTime().getHours();     int m = calendar.getTime().getMinutes();     wheelMain.initDateTimePicker(year, month, day, h, m);     new AlertDialog.Builder(MainActivity.this)       .setTitle("選擇時間")       .setView(timepickerview)       .setPositiveButton("確定",         new DialogInterface.OnClickListener() {          @Override          public void onClick(DialogInterface dialog,            int which) {           txttime.setText(wheelMain.getTime());          }         })       .setNegativeButton("取消",         new DialogInterface.OnClickListener() {          @Override          public void onClick(DialogInterface dialog,            int which) {          }         }).show();    }   });  } }