自定义SeekBarPreference

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自定义SeekBarPreference控件，和系统的SeekBarDialogPreference类似，系统的SeekBarDialogPreference、

SeekBarPreference是对外隐藏的，系统应用可以使用

SeekBarDialogPreference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:max SeekBar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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