我已经看到了许多针对这个问题的定制解决方案和答案.我需要一些非常简单的东西，我有一个偏好活动，我所需要的只是其中一个选项将打开带有数字选择器的对话框并保存结果.你能指导我一步一步地完成这个吗?
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>
数字选择器 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>
子类 DialogPreference 来构建您自己的 NumberPickerPreference.
Subclass DialogPreference to build your own NumberPickerPreference.
我在下面为您实现了一个.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的常量.这些实际上应该是首选项 xml 声明中的属性.要让它工作，您需要添加一个 attrs.xml 文件来指定您的自定义属性.
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.
有关在库项目中支持自定义 xml 属性的 NumberPicker 首选项小部件的完整实现以及展示如何使用它的演示应用，请参阅 GitHub:https://github.com/Alobar/AndroidPreferenceTest
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
您可以将该小部件用作任何其他首选项小部件，除非您必须完全限定名称:
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;
}
}
这篇关于带有数字选择器的 Android PreferenceActivity 对话框的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持跟版网！