如何将EditTextPreference限制为范围1024:65535 [英] How to limit EditTextPreference to a range 1024:65535

问题描述

我有一个EditTextPreference定义为:

I have a EditTextPreference defined as:

<EditTextPreference 
android:defaultValue="8888" 
android:key="someKey" 
android:title="SomeString"
android:inputType="number"    
>

EditTextPreference内部使用一个EditText，可以通过EditTextPreference.getEditText()获得.

EditTextPreference uses an EditText internally which can be obtained with EditTextPreference.getEditText().

我想将用户可以输入的数字限制在1024到65535之间的整数范围内.我该怎么做?

I would like to limit the number the user can input to a range of integers between 1024 and 65535. How can I do that?

我尝试同时使用InputFilter和TextWatcher，但没有成功.

I tried to use both an InputFilter and a TextWatcher without success.

有什么想法吗?

您可能已经猜到我正在尝试验证输入的网络端口.也许我应该为此使用其他输入方式?

As you might have guessed I am trying to validate inputting a network port. Maybe I should use some other kind of input for this?

推荐答案

您可以使用EditText进行此操作，但是使用

You can do this using a EditText, but it would be much easier using a NumberPicker.

它具有针对您需要的预定义方法: setMinValue( int)， setMaxValue(int).

It has predefined methods for what you want: setMinValue(int), setMaxValue(int).

寻求灵感:

import android.content.Context;
import android.preference.DialogPreference;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;
import android.widget.NumberPicker;

/*
 * Add this to your XML resource.
 */
public class NumberPickerPreference extends DialogPreference {

    private NumberPicker numberPicker;

    public NumberPickerPreference(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    protected View onCreateDialogView() {
        return generateNumberPicker();
    }

    public NumberPicker generateNumberPicker() {
        numberPicker = new NumberPicker(getContext());
        numberPicker.setMinValue(1025);
        numberPicker.setMaxValue(65535);
        numberPicker.setValue(1025);

        /*
         * Anything else you want to add to this.
         */

        return numberPicker;
    }

    @Override
    protected void onDialogClosed(boolean positiveResult) {
        super.onDialogClosed(positiveResult);
        if (positiveResult) {
            int port = numberPicker.getValue();
            Log.d("NumberPickerPreference", "NumberPickerValue : " + port);
        }
    }

}

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