如何創建僅接受預定義範圍值的EditTextPreference？

我希望EditTextPreference只接受6000到65536之間的值，我該怎麼辦？謝謝！如何創建僅接受預定義範圍值的EditTextPreference？

BTW，代碼中的不工作，我不能輸入任意數量的EditTextPreference的編輯框，其關鍵是「WebServerPort」

<EditTextPreference 
    android:key="WebServerPort" 
    android:defaultValue="6000" 
    android:title="Port" 
    android:summary="Set port for web server, it should be greater than 6000 and less than 65536" 
    android:inputType="number" 
    android:layout="@layout/layout_customize_preference_item" 
/>

代碼A

public class UIPreference extends PreferenceActivity { 
    private AdView adView; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     addPreferencesFromResource(R.xml.mypreference); 
     setContentView(R.layout.layout_preference); 


     EditTextPreference edit_Pref = (EditTextPreference) getPreferenceScreen().findPreference("WebServerPort"); 
     edit_Pref.getEditText().setFilters(new InputFilter[]{ new InputFilterMinMax("6000", "65536")}); 
    } 
} 


class InputFilterMinMax implements InputFilter { 

    private int min, max; 

    public InputFilterMinMax(int min, int max) { 
     this.min = min; 
     this.max = max; 
    } 

    public InputFilterMinMax(String min, String max) { 
     this.min = Integer.parseInt(min); 
     this.max = Integer.parseInt(max); 
    } 

    @Override 
    public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart, int dend) { 
     try { 
      int input = Integer.parseInt(dest.toString() + source.toString()); 
      if (isInRange(min, max, input)) 
       return null; 
     } catch (NumberFormatException nfe) { } 
     return ""; 
    } 

    private boolean isInRange(int a, int b, int c) { 
     return b > a ? c >= a && c <= b : c >= b && c <= a; 
    } 
}

來源

2017-04-17 HelloCW

請參閱此鏈接「http://stackoverflow.com/questions/14212518/is-there-a-way-到限定-A-最小和-MAX值換的EditText功能於機器人」。它會幫助你。 – Harshitha

嘗試在editTextPreference.getEditText（）上添加InputFilter

InputFilter filter = new InputFilter() { 
     public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart, int dend) { 
      int number = 0; 

      try { 
       number = Integer.parseInt(source.toString()); 
      } catch (Exception e) { 
      } 
      if(number > 6000 && number < 65536) { 
       return source; 
      } 
      return null; 
     } 
    }; 
    editTextPreference.getEditText().setFilters(new InputFilter[] { filter });

來源

2017-04-17 07:51:15 Pehlaj

您可以將TextWatcher分配給您的EditText並傾聽文本的變化有，例如：

editTextPreference.getEditText().addTextChangedListener(new TextWatcher() { 
     @Override 
     public void beforeTextChanged(CharSequence s, int start, int count, int after) { 

     } 

     @Override 
     public void onTextChanged(CharSequence s, int start, int before, int count) { 

     } 

     @Override 
     public void afterTextChanged(Editable s) { 
      try { 
       long val = Long.parseLong(s.toString()); 
       if(val > 65536) { 
        s.replace(0, s.length(), "65536", 0, 5); 
       } else if(val < 6000) { 
        s.replace(0, s.length(), "6000", 0, 4); 
       } 
      } catch (NumberFormatException ex) { 
       // Do something 
      } 
     } 
});

來源

2017-04-17 07:53:10

謝謝！但代碼A（我在我的問題中添加它）不起作用，我不能在EditTextPreference的編輯框中輸入任何數字 – HelloCW

@HelloCW更新了我的答案。覈實 –

如何創建僅接受預定義範圍值的EditTextPreference？

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