自定义SeekBarPreference控件（老外出品,直接在preferences文件中使用，无需其他代码）

下面介绍SeekBarPreference控件，保存的Value为数字值，直接可以在preferences.xml文件中使用无需其他代码。

下面是控件使用到得标准Android属性

android:dialogMessage 显示对话框中的文本信息
android:text 在选择进度条后，显示的文本信息
android:maxSeekBar的最大值

                  /*           The following code was written by Matthew Wiggins 
 * and is released under the APACHE 2.0 license 
 * 
 *           http://www.apache.org/licenses/LICENSE-2.0          
           */          
package com.hlidskialf.android.preference;

import android.content.Context;
import android.util.AttributeSet;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.preference.DialogPreference;
import android.widget.SeekBar;
import android.widget.TextView;
import android.widget.LinearLayout;


          public                     class           SeekBarPreference extends DialogPreference implements SeekBar.OnSeekBarChangeListener
{
           private                     static           final String androidns          =          "          http://schemas.android.com/apk/res/android          "          ;

           private           SeekBar mSeekBar;
           private           TextView mSplashText,mValueText;
           private           Context mContext;

           private           String mDialogMessage, mSuffix;
           private                     int           mDefault, mMax, mValue           =                     0          ;

           public           SeekBarPreference(Context context, AttributeSet attrs) { 
 super(context,attrs); 
 mContext           =           context;

 mDialogMessage           =           attrs.getAttributeValue(androidns,          "          dialogMessage          "          );
 mSuffix           =           attrs.getAttributeValue(androidns,          "          text          "          );
 mDefault           =           attrs.getAttributeIntValue(androidns,          "          defaultValue          "          ,           0          );
 mMax           =           attrs.getAttributeIntValue(androidns,          "          max          "          ,           100          );

 }
 @Override 
           protected           View onCreateDialogView() {
 LinearLayout.LayoutParams           params          ;
 LinearLayout layout           =                     new           LinearLayout(mContext);
 layout.setOrientation(LinearLayout.VERTICAL);
 layout.setPadding(          6          ,          6          ,          6          ,          6          );

 mSplashText           =                     new           TextView(mContext);
           if           (mDialogMessage           !=                     null          )
 mSplashText.setText(mDialogMessage);
 layout.addView(mSplashText);

 mValueText           =                     new           TextView(mContext);
 mValueText.setGravity(Gravity.CENTER_HORIZONTAL);
 mValueText.setTextSize(          32          );
           params                     =                     new           LinearLayout.LayoutParams(
 LinearLayout.LayoutParams.FILL_PARENT, 
 LinearLayout.LayoutParams.WRAP_CONTENT);
 layout.addView(mValueText,           params          );

 mSeekBar           =                     new           SeekBar(mContext);
 mSeekBar.setOnSeekBarChangeListener(          this          );
 layout.addView(mSeekBar,           new           LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT));

           if           (shouldPersist())
 mValue           =           getPersistedInt(mDefault);

 mSeekBar.setMax(mMax);
 mSeekBar.setProgress(mValue);
           return           layout;
 }
 @Override 
           protected                     void           onBindDialogView(View v) {
 super.onBindDialogView(v);
 mSeekBar.setMax(mMax);
 mSeekBar.setProgress(mValue);
 }
 @Override
           protected                     void           onSetInitialValue(boolean restore, Object defaultValue) 
 {
 super.onSetInitialValue(restore, defaultValue);
           if           (restore) 
 mValue           =           shouldPersist()           ?           getPersistedInt(mDefault) :           0          ;
           else           
 mValue           =           (Integer)defaultValue;
 }

           public                     void           onProgressChanged(SeekBar seek,           int           value, boolean fromTouch)
 {
 String t           =           String.valueOf(value);
 mValueText.setText(mSuffix           ==                     null                     ?           t : t.concat(mSuffix));
           if           (shouldPersist())
 persistInt(value);
 callChangeListener(          new           Integer(value));
 }
           public                     void           onStartTrackingTouch(SeekBar seek) {}
           public                     void           onStopTrackingTouch(SeekBar seek) {}

           public                     void           setMax(          int           max) { mMax           =           max; }
           public                     int           getMax() {           return           mMax; }

           public                     void           setProgress(          int           progress) { 
 mValue           =           progress;
           if           (mSeekBar           !=                     null          )
 mSeekBar.setProgress(progress); 
 }
           public                     int           getProgress() {           return           mValue; }
}

下面是在XML layout的例子

                             <          com.hlidskialf.android.preference.SeekBarPreference           android:key          ="duration"          
 android:title          ="Duration of something"          
 android:summary          ="How long something will last"          
 android:dialogMessage          ="Something duration"          
 android:defaultValue          ="5"          
 android:text          =" minutes"          
 android:max          ="60"          
           />

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