EditText 的使用

EditText 用來輸入編輯資料,它繼承自 TextView,許多在 TextView中的方法也可以在這使用, 可藉由 xml 來定義, 其中參數可以調整輸入資料格式,長度等等,一個 EditText 在 xml 中定義如下

   1:      <EditText

   2:          android:id="@+id/editTextTime"

   3:          android:layout_width="wrap_content"

   4:          android:layout_height="wrap_content"

   5:          android:ems="10"

   6:          android:inputType="date" >

   7:          <requestFocus />

   8:      </EditText>

第 5 行限制字數為 10 個字元
第 6 行限制輸入格式為 date

也有一些常用的方法如下

   1:          //get EditText

   2:          EditText etMoney = (EditText) findViewById(R.id.editTextMoney);

   3:          etMoney.setText("0000");

   4:          etMoney.getText().toString(); 

   5:          etMoney.setHint("提示");

   6:          etMoney.setInputType(InputType.TYPE_NULL);// disappear keyboard

特殊方法
1.
點擊 EditText 關閉原本的 keyboard, 並跳出調整日期選項,調整完再設定到 EditText 中

   1:          //get edTime

   2:          etTime = (EditText) findViewById(R.id.editTextTime);        

   3:          //get now date

   4:          final Calendar cal = Calendar.getInstance();

   5:          String dateStr = "" + cal.get(Calendar.YEAR) // 2012

   6:                  + "/" + (cal.get(Calendar.MONTH) + 1) // 12 (add 1 because it start from 0)

   7:                  + "/" + cal.get(Calendar.DATE);// 24

   8:                                                  // ....

   9:          //now date set to etTime

  10:          etTime.setText(dateStr);

  11:          // set keyboard disappear

  12:          etTime.setInputType(InputType.TYPE_NULL);

  13:          // touch etTime will show datePickDialog

  14:          etTime.setOnClickListener(new OnClickListener() 

  15:          {

  16:              

  17:              @Override

  18:              public void onClick(View v) {

  19:                  // TODO Auto-generated method stub

  20:                  

  21:                  new DatePickerDialog(ADEdit_Flow.this, new DatePickerDialog.OnDateSetListener()

  22:                  {

  23:                      

  24:                      @Override

  25:                      public void onDateSet(DatePicker view, int year, int monthOfYear,

  26:                              int dayOfMonth) {

  27:                          // TODO Auto-generated method stub

  28:                          etTime.setText(""+year+"/"+(monthOfYear+1)+"/"+dayOfMonth);

  29:                          FP.p("touch");

  30:                      }

  31:                  }, cal.get(Calendar.YEAR), cal.get(Calendar.MONTH), cal.get(Calendar.DATE)).show();

  32:              }

  33:          });

2.
檢查輸入字數不可超過 7 位數,超過出現提示並重新輸入

   1:          //get EditText

   2:          EditText etMoney = (EditText) findViewById(R.id.editTextMoney);

   3:          etMoney.setText("100");

   4:          

   5:          etMoney.addTextChangedListener(new TextWatcher() {

   6:              

   7:              @Override

   8:              public void onTextChanged(CharSequence s, int start, int before, int count) {

   9:                  // TODO Auto-generated method stub

  10:                  

  11:              }

  12:              

  13:              @Override

  14:              public void beforeTextChanged(CharSequence s, int start, int count,

  15:                      int after) {

  16:                  // TODO Auto-generated method stub

  17:                  

  18:              }

  19:              

  20:              @Override

  21:              public void afterTextChanged(Editable s) {

  22:                  // TODO Auto-generated method stub

  23:                  if(s.length()>7){

  24:                      Toast.makeText(ADEdit_Flow.this, "最大輸入7位數字,請重新輸入",Toast.LENGTH_SHORT).show();

  25:                      s.clear();

  26:                  }

  27:              }

  28:          });

3.
若字串開頭部分有0,去掉0再重整,如 00987 -> 987,原理是藉由 Integer 的 parseInt() 來達成

   1:  String temps =  etMoney.getText().toString();//只要可以轉換為字串即可   

   2:  int tempi = Integer.parseInt(temps);

   3:  String.valueOf(tempi);

Posted in: Android App