android之datepicker控件的用法

package com.example.mars_2200_datepicker;

import java.util.Calendar;

import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
import android.app.DatePickerDialog;
import android.app.Dialog;
import android.os.bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.button;
import android.widget.DatePicker;
import android.widget.TextView;
import android.os.build;

public class MainActivity extends ActionBarActivity {
  private TextView textViewDateDisplay;
  private Button btnPickDate;
  privatE int mYear;
  privatE int mMonth;
  privatE int mDay;

  static final int DATE_DIALOG_ID = 0;

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

    textViewDateDisplay = (TextView) findViewById(R.id.textViewDateDisplay);
    btnPickDate = (Button) findViewById(R.id.btnPickDatE);

    btnPickDate.setOnClickListener(new View.onClickListener() {
      public void onClick(View v) {
        showDialog(DATE_DIALOG_ID);
      }
    });
    final Calendar c = Calendar.geTinstance();
    mYear = c.get(Calendar.YEAR);
    mMonth = c.get(Calendar.MONTH);
    mDay = c.get(Calendar.DAY_OF_MONTH);

    updateDisplay();
  }

  @Override
  public Boolean onCreateOptionsMenu(Menu menu) {

    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main,menu);
    return true;
  }

  @Override
  public Boolean onOptionsItemSELEcted(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button,so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();
    if (id == R.id.action_setTings) {
      return true;
    }
    return super.onOptionsItemSELEcted(item);
  }

  /**
   * A placeholder fragment containing a simple view.
   */
  public static class PlaceholderFragment extends Fragment {

    public PlaceholderFragment() {
    }

    @Override
    public View onCreateView(LayoutInflater inflater,ViewGroup container,Bundle savedInstanceStatE) {
      View rootView = inflater.inflate(R.layout.fragment_main,container,falsE);
      return rootView;
    }
  }

  private void updateDisplay() {
    textViewDateDisplay.setText(new StringBuilder().append(mYear).append("-")
        .append(mMonth + 1).append("-").append(mDay).append(" "));
  }

  private DatePickerDialog.onDateSetListener mDateSetListener = new DatePickerDialog.onDateSetListener() {
    public void onDateSet(DatePicker view,int year,int monthOfYear,int dayOfMonth) {
      mYear = year;
      mMonth = monthOfYear;
      mDay = dayOfMonth;
      updateDisplay();
    }
  };

  protected Dialog onCreateDialog(int id) {
    switch (id) {
    case DATE_DIALOG_ID:
      return new DatePickerDialog(this,mDateSetListener,mYear,mMonth,mDay);
    }
    return null;
  }
}

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