Android(安卓)中日期对话框的应用

 import java.util.Calendar;  import android.widget.DatePicker;   import android.app.DatePickerDialog;        //日期对话框的标记 常量     private static final int DATE_DIALOG_ID = 1;       private static final int SHOW_DATAPICK = 0;     //日期变量     private int mYear;       private int mMonth;       private int mDay;     //当前操作的日期控件的标记     private String strDate_Tag="";      //购买日期     private EditText m_txtPurchaseDate = null;       private Button m_butPurchaseDate = null;       //安装日期     private EditText m_txtInstallationDate = null;       private Button m_butInstallationDate = null;    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);                //购买日期        m_txtPurchaseDate = (EditText) findViewById(R.id.txtPurchaseDate);          m_butPurchaseDate = (Button) findViewById(R.id.butPurchaseDate);          //安装日期        m_txtInstallationDate= (EditText) findViewById(R.id.txtInstallationDate);          m_butInstallationDate = (Button) findViewById(R.id.butInstallationDate);         initDate();//初始化 日期    }    //初始化 日期    private void initDate(){                        final Calendar c = Calendar.getInstance();          mYear = c.get(Calendar.YEAR);          mMonth = c.get(Calendar.MONTH);          mDay = c.get(Calendar.DAY_OF_MONTH);          //setDateTime();//设置日期         strDate_Tag="PurchaseDate";//购买日期        setDateTime();        strDate_Tag="InstallationDate";//安装日期        setDateTime();            }    //设置日期   为文本框 赋值    private void setDateTime() {          if(strDate_Tag=="PurchaseDate"){//购买日期            m_txtPurchaseDate.setText(new StringBuilder().append(mYear +"-").append(                      (mMonth + 1) < 10 ? "0" + (mMonth + 1)+"-" : (mMonth + 1)+"-").append(                     (mDay < 10) ? "0" + mDay : mDay));        }else if(strDate_Tag=="InstallationDate"){//安装日期            m_txtInstallationDate.setText(new StringBuilder().append(mYear +"-").append(                      (mMonth + 1) < 10 ? "0" + (mMonth + 1)+"-" : (mMonth + 1)+"-").append(                     (mDay < 10) ? "0" + mDay : mDay));        }    }          //日期控件的事件     private DatePickerDialog.OnDateSetListener mDateSetListener = new DatePickerDialog.OnDateSetListener() {         public void onDateSet(DatePicker view, int year, int monthOfYear,                int dayOfMonth) {             mYear = year;             mMonth = monthOfYear;             mDay = dayOfMonth;             setDateTime();  //设置日期   为文本框 赋值       }      };     //购买日期Button的事件处理     class butPurchaseDateOnClickListener implements             android.view.View.OnClickListener {         public void onClick(View v) {             strDate_Tag="PurchaseDate";//当前点击的日期为 购买日期                      String[] arrPurchaseDate =m_txtPurchaseDate.getText().toString().split("-");           mYear =  Integer.parseInt(arrPurchaseDate[0]);             mMonth = Integer.parseInt(arrPurchaseDate[1]);           mDay = Integer.parseInt(arrPurchaseDate[2]);           Message msg = new Message();             if (m_butPurchaseDate.equals((Button) v)) {                msg.what = MainActivity.SHOW_DATAPICK;             }             MainActivity.this.saleHandler.sendMessage(msg);         }      }    //购买日期Button的事件处理     class butInstallationDateOnClickListener implements             android.view.View.OnClickListener {         public void onClick(View v) {             strDate_Tag="InstallationDate";//当前点击的日期为 安装日期                      String[] arrInstallationDate =m_txtInstallationDate.getText().toString().split("-");           mYear =  Integer.parseInt(arrInstallationDate[0]);             mMonth = Integer.parseInt(arrInstallationDate[1]);           mDay = Integer.parseInt(arrInstallationDate[2]);                      Message msg = new Message();             if (m_butInstallationDate.equals((Button) v)) {                msg.what = MainActivity.SHOW_DATAPICK;             }             MainActivity.this.saleHandler.sendMessage(msg);         }      }    //创建对话框 日期    protected Dialog onCreateDialog(int id) {         switch (id) {         case DATE_DIALOG_ID:  //日期           return new DatePickerDialog(this, mDateSetListener, mYear, mMonth,  mDay);          }         return null;      }      protected void onPrepareDialog(int id, Dialog dialog) {         switch (id) {         case DATE_DIALOG_ID:             ((DatePickerDialog) dialog).updateDate(mYear, mMonth, mDay);             break;         }      }        //处理日期控件的Handler     Handler saleHandler = new Handler() {         @Override         public void handleMessage(Message msg) {             switch (msg.what) {             case MainActivity.SHOW_DATAPICK:                showDialog(DATE_DIALOG_ID);                break;             }         }      };
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