带有数字选择器的Android PreferenceActivity对话框 [英] Android PreferenceActivity dialog with number picker

问题描述

我已经看到许多定制的解决方案和这个问题的答案。我需要一些非常简单的东西，我有一个偏好活动，我需要的只是一个选项将打开一个选择器的对话框并保存结果。你可以一步一步地指导我如何完成这个吗？

  public class SettingsActivity extends PreferenceActivity 
 {
 @Override 
 protected void onCreate（final Bundle savedInstanceState）
 {
 super.onCreate（savedInstanceState）; 
 getFragmentManager（）。beginTransaction（）。replace（android.R.id.content，new MyPreferenceFragment（））。commit（）; 
 //requestWindowFeature(Window.FEATURE_NO_TITLE）; 
} 
 
 public static class MyPreferenceFragment extends PreferenceFragment 
 {
 @Override 
 public void onCreate（final Bundle savedInstanceState）
 {
 super.onCreate（savedInstanceState）; 
 addPreferencesFromResource（R.xml.prefs）; 
 
} 
} 
 
} 
  

XML：

 < SwitchPreference 
 android：key =cross 
 android：summaryOff =Cross is invisible
 android：summaryOn =Cross is visible
 android：switchTextOff =OFF
 android：switchTextOn =ON
 android：title =Cross
 android：defaultValue =true/> 
 
< SwitchPreference 
 android：key =autoP
 android：summaryOff =应用程序将去睡觉
 android：summaryOn =应用程序不会去
 android：switchTextOff =OFF
 android：switchTextOn =ON
 android：title =Always On
 android：defaultValue =true/> ; 
 
< SwitchPreference 
 android：key =tempD
 android：summaryOff =Tempature not displayed
 android：summaryOn =Tempature displayed
 android：switchTextOff =OFF
 android：switchTextOn =ON
 android：title =Tempature Display
 android：defaultValue =true/> 
 
< ListPreference 
 android：entries =@ array / units
 android：entryValues =@ array / lunits
 android：key =listUnits 
 android：summary =Units schosssing
 android：title =Unitsandroid：defaultValue =C/> 
 
<！ - 需要添加按钮打开对话框 - > 
 
< / PreferenceScreen> 
  

Number Picker XML：

 < RelativeLayout xmlns：android =http://schemas.android.com/apk/res/android
 android：layout_width =fill_parent
 android：layout_height = fill_parent> 
 
< NumberPicker 
 android：id =@ + id / numberPicker1
 android：layout_width =wrap_content
 android：layout_height =wrap_content
 android：layout_alignParentTop =true
 android：layout_centerHorizo​​ntal =true
 android：layout_marginTop =64dp/> 
 
< Button 
 android：id =@ + id / button2
 android：layout_width =wrap_content
 android：layout_height =wrap_content
 android：layout_below =@ + id / numberPicker1
 android：layout_marginLeft =20dp
 android：layout_marginTop =98dp
 android：layout_toRightOf =@ + id / numberPicker1 
 android：text =取消/> 
 
< Button 
 android：id =@ + id / button1
 android：layout_width =wrap_content
 android：layout_height =wrap_content
 android：layout_alignBaseline =@ + id / button2
 android：layout_alignBottom =@ + id / button2
 android：layout_marginRight =16dp
 android：layout_toLeftOf =@ id / numberPicker1
 android：text =Set/> 
 
< / RelativeLayout> 
  

解决方案

子类 DialogPreference 建立你自己的 NumberPickerPreference 。

我已经为您实施了一个。它工作得很好，但功能不完整。例如，最小值和最大值是硬编码常量。这些应该是偏好xml声明的属性。为了使它工作，您需要添加一个指定自定义属性的attrs.xml文件。

要完整实现支持库项目中自定义xml属性的NumberPicker偏好窗口小部件，以及演示如何使用它的演示应用程序，请参阅GitHub： https://github.com/Alobar/AndroidPreferenceTest

你将使用该小部件作为任何其他偏好小部件，除非您必须完全限定名称：

preferences.xml

 < PreferenceScreen xmlns：android =http://schemas.android.com/apk/res/android> 
 
< com.example.preference.NumberPickerPreference 
 android：key =key_number
 android：title =给我一个数字
 android：defaultValue = 55/> 
 
< / PreferenceScreen> 
  

NumberPickerPreference.java

  package com.example.preference; 
 
 import android.content.Context; 
 import android.content.res.TypedArray; 
 import android.preference.DialogPreference; 
 import android.util.AttributeSet; 
 import android.view.Gravity; 
 import android.view.View; 
 import android.view.ViewGroup; 
 import android.widget.FrameLayout; 
 import android.widget.NumberPicker; 
 
 / ** 
 *一个{@link android.preference.Preference}，显示一个数字选择器作为对话框。 
 * / 
 public class NumberPickerPreference extends DialogPreference {
 
 //允许范围
 public static final int MAX_VALUE = 100; 
 public static final int MIN_VALUE = 0; 
 //启用或禁用'循环行为'
 public static final boolean WRAP_SELECTOR_WHEEL = true; 
 
私人NumberPicker选择器
 private int value; 
 
 public NumberPickerPreference（Context context，AttributeSet attrs）{
 super（context，attrs）; 
} 
 
 public NumberPickerPreference（Context context，AttributeSet attrs，int defStyleAttr）{
 super（context，attrs，defStyleAttr）; 
} 
 
 @Override 
 protected View onCreateDialogView（）{
 FrameLayout.LayoutParams layoutParams = new FrameLayout.LayoutParams（
 ViewGroup.LayoutParams.WRAP_CONTENT，ViewGroup .LayoutParams.WRAP_CONTENT）; 
 layoutParams.gravity = Gravity.CENTER; 
 
 picker = new NumberPicker（getContext（））; 
 picker.setLayoutParams（layoutParams）; 
 
 FrameLayout dialogView = new FrameLayout（getContext（））; 
 dialogView.addView（picker）; 
 
 return dialogView; 
} 
 
 @Override 
 protected void onBindDialogView（查看视图）{
 super.onBindDialogView（view）; 
 picker.setMinValue（MIN_VALUE）; 
 picker.setMaxValue（MAX_VALUE）; 
 picker.setWrapSelectorWheel（WRAP_SELECTOR_WHEEL）; 
 picker.setValue（getValue（））; 
} 
 
 @Override 
 protected void onDialogClosed（boolean positiveResult）{
 if（positiveResult）{
 picker.clearFocus（）; 
 int newValue = picker.getValue（）; 
 if（callChangeListener（newValue））{
 setValue（newValue）; 
} 
} 
} 
 
 @Override 
 protected Object onGetDefaultValue（TypedArray a，int index）{
 return a.getInt ，MIN_VALUE）; 
 
 
 @Override 
 protected void onSetInitialValue（boolean restorePersistedValue，Object defaultValue）{
 setValue（restorePersistedValue？getPersistedInt（MIN_VALUE）：（Integer）defaultValue）; 
} 
 
 public void setValue（int value）{
 this.value = value; 
 persistInt（this.value）; 
} 
 
 public int getValue（）{
 return this.value; 
} 
} 
  

I have seen many customized solutions and answers to this question. I need something very simple, I have a preference activity and all I need is that one of the options will open dialog with a number picker and save the results. Can you please guide me step by step with how to accomplish this?

public class SettingsActivity extends PreferenceActivity
{
    @Override
    protected void onCreate(final Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        getFragmentManager().beginTransaction().replace(android.R.id.content, new MyPreferenceFragment()).commit();
        //requestWindowFeature(Window.FEATURE_NO_TITLE);    
    }

    public static class MyPreferenceFragment extends PreferenceFragment
    {
        @Override
        public void onCreate(final Bundle savedInstanceState)
        {
            super.onCreate(savedInstanceState);
            addPreferencesFromResource(R.xml.prefs);

        }
    }

}

XML:

    <SwitchPreference
        android:key="cross"
        android:summaryOff="Cross is invisible"
        android:summaryOn="Cross is visible"
        android:switchTextOff="OFF"
        android:switchTextOn="ON"
        android:title="Cross" 
        android:defaultValue="true"/>

    <SwitchPreference
        android:key="autoP"
        android:summaryOff="App will go to sleep"
        android:summaryOn="App will not go to sleep"
        android:switchTextOff="OFF"
        android:switchTextOn="ON"
        android:title="Always On" 
        android:defaultValue="true"/>

    <SwitchPreference
        android:key="tempD"
        android:summaryOff="Temprature not displayed"
        android:summaryOn="Temprature displayed"
        android:switchTextOff="OFF"
        android:switchTextOn="ON"
        android:title="Tempature Display" 
        android:defaultValue="true"/>

    <ListPreference
        android:entries="@array/units"
        android:entryValues="@array/lunits"
        android:key="listUnits"
        android:summary="Units schosssing"
        android:title="Units" android:defaultValue="C"/>

     <!--Need to add button to open dialog-->       

</PreferenceScreen>

Number Picker XML:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >

    <NumberPicker
        android:id="@+id/numberPicker1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="64dp" />

    <Button
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/numberPicker1"
        android:layout_marginLeft="20dp"
        android:layout_marginTop="98dp"
        android:layout_toRightOf="@+id/numberPicker1"
        android:text="Cancel" />

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBaseline="@+id/button2"
        android:layout_alignBottom="@+id/button2"
        android:layout_marginRight="16dp"
        android:layout_toLeftOf="@+id/numberPicker1"
        android:text="Set" />

</RelativeLayout>

解决方案

Subclass DialogPreference to build your own NumberPickerPreference.

I have implemented one below for you. It works perfectly fine, but is not feature complete. For example the minimum and maximum values are hard-coded constants. These should really be attributes on the preference xml declaration. To get that to work you would need to add an attrs.xml file specifying your custom attributes.

For the full implementation of the NumberPicker preference widget that supports custom xml attributes in a library project and a demo app showing how to use it, see GitHub: https://github.com/Alobar/AndroidPreferenceTest

You would use the widget as any other preference widget, except you have to fully qualify the name:

preferences.xml

<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">

    <com.example.preference.NumberPickerPreference
        android:key="key_number"
        android:title="Give me a number"
        android:defaultValue="55" />

</PreferenceScreen>

NumberPickerPreference.java

package com.example.preference;

import android.content.Context;
import android.content.res.TypedArray;
import android.preference.DialogPreference;
import android.util.AttributeSet;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.FrameLayout;
import android.widget.NumberPicker;

/**
 * A {@link android.preference.Preference} that displays a number picker as a dialog.
 */
public class NumberPickerPreference extends DialogPreference {

    // allowed range
    public static final int MAX_VALUE = 100;
    public static final int MIN_VALUE = 0;
    // enable or disable the 'circular behavior'
    public static final boolean WRAP_SELECTOR_WHEEL = true; 

    private NumberPicker picker;
    private int value;

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

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

    @Override
    protected View onCreateDialogView() {
        FrameLayout.LayoutParams layoutParams = new FrameLayout.LayoutParams(
                ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
        layoutParams.gravity = Gravity.CENTER;

        picker = new NumberPicker(getContext());
        picker.setLayoutParams(layoutParams);

        FrameLayout dialogView = new FrameLayout(getContext());
        dialogView.addView(picker);

        return dialogView;
    }

    @Override
    protected void onBindDialogView(View view) {
        super.onBindDialogView(view);
        picker.setMinValue(MIN_VALUE);
        picker.setMaxValue(MAX_VALUE);
        picker.setWrapSelectorWheel(WRAP_SELECTOR_WHEEL);
        picker.setValue(getValue());
    }

    @Override
    protected void onDialogClosed(boolean positiveResult) {
        if (positiveResult) {
            picker.clearFocus();
            int newValue = picker.getValue();
            if (callChangeListener(newValue)) {
                setValue(newValue);
            }
        }
    }

    @Override
    protected Object onGetDefaultValue(TypedArray a, int index) {
        return a.getInt(index, MIN_VALUE);
    }

    @Override
    protected void onSetInitialValue(boolean restorePersistedValue, Object defaultValue) {
        setValue(restorePersistedValue ? getPersistedInt(MIN_VALUE) : (Integer) defaultValue);
    }

    public void setValue(int value) {
        this.value = value;
        persistInt(this.value);
    }

    public int getValue() {
        return this.value;
    }
}

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