Android下的扩展SeekBar

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Android系统下的SeekBar太简单，简单到连起止的提示和动态选择后变化的提示都没有。最起码我没找到，所以自己实现了一个扩展的SeekBar，应该好用很多。其效果图如下：

Android下的扩展SeekBar

贴上代码：
1、调用的方法举例：
        //seek bar preference
        ExtSeekBarPreference loPrefHttpRangeSize = new ExtSeekBarPreference(this, null);
        loPrefHttpRangeSize.setKey(PREF_KEY_HTTP_RANGE_SIZE);
        loPrefHttpRangeSize.setTitle(R.string.CONFIG_TITLE_HTTP_RANGESIZE);
        loPrefHttpRangeSize.setPersistent(true);
        loPrefHttpRangeSize.setMin(3);
        loPrefHttpRangeSize.setMax(20);
        loPrefHttpRangeSize.setKeyProgressIncrement(1);
        loPrefHttpRangeSize.setUnit("00KB");
        loPrefHttpRangeSize.setValue(coGlobalContext.coPrefs.getInt(PREF_KEY_HTTP_RANGE_SIZE, PREF_DEFAULT_HTTP_RANGE_SIZE));
        loPrefHttpRangeSize.setSummary(coGlobalContext.coPrefs.getInt(PREF_KEY_HTTP_RANGE_SIZE, PREF_DEFAULT_HTTP_RANGE_SIZE));
        loPrefHttpRangeSize.setNegativeButtonText(getResources().getString(R.string.CONFIRM_CANCEL));
        loPrefHttpRangeSize.setPositiveButtonText(getResources().getString(R.string.CONFIRM_OK));
        dialogBasedPrefCat.addPreference(loPrefHttpRangeSize);

2、扩展的SeekBar类：
public class ExtSeekBarPreference extends DialogPreference implements SeekBar.OnSeekBarChangeListener{

    private int                    ciMinVal=0;
    private int                 ciMaxVal=100;
    private int                 ciInitVal=0;
    private int                 ciIncrement=1;
    private String                 csUnit="";
    private Context             coContext;
    private TextView            coSeekBarValView=null;
    private SeekBar             coSeekBar;

    public ExtSeekBarPreference(Context aoContext, AttributeSet attrs)
    {
        super(aoContext, attrs);
        this.coContext = aoContext;
    }

    public int getMin()
    {
        return ciMinVal;
    }

    public void setMin(int aiMin)
    {
        ciMinVal = aiMin;
    }

    public void setMax(int aiMax)
    {
        ciMaxVal = aiMax;
    }

    public void setUnit(String asUnit)
    {
        csUnit = asUnit;
    }

    public void setKeyProgressIncrement(int aiIncrement)
    {
        ciIncrement = aiIncrement;
    }

    public void setValue(int aiVal)
    {
        ciInitVal = aiVal;
    }

    protected void onPrepareDialogBuilder(Builder builder)
    {
        LayoutInflater factory = LayoutInflater.from(coContext);
        View loSeekBarView = factory.inflate(R.layout.view_ext_seekbar, null);
        builder.setView(loSeekBarView);

        coSeekBar = (SeekBar)loSeekBarView.findViewById(R.id.SeekBarControl);
        coSeekBar.setOnSeekBarChangeListener(this);
        coSeekBar.setMax(ciMaxVal-ciMinVal);
        coSeekBar.setKeyProgressIncrement(ciIncrement);

        TextView loMinText = (TextView)loSeekBarView.findViewById(R.id.SeekBarMin);
        loMinText.setText(ciMinVal+csUnit);

        TextView loMaxText = (TextView)loSeekBarView.findViewById(R.id.SeekBarMax);
        loMaxText.setText(ciMaxVal+csUnit);

        coSeekBarValView = (TextView)loSeekBarView.findViewById(R.id.SeekBarVal);

        //initial value
        coSeekBar.setProgress(ciInitVal-ciMinVal);
    }

    public void setSummary(int aiVal)
    {
        String                 lsSummary="";

        lsSummary = (aiVal) + csUnit;

        super.setSummary(lsSummary);
    }

    protected void onDialogClosed(boolean positiveResult)
    {
        if (positiveResult)
        {
            // 保存SeekBar的值
            persistInt(coSeekBar.getProgress()+ciMinVal);

            // must reset initval
            ciInitVal = coSeekBar.getProgress()+ciMinVal;
        }

        super.onDialogClosed(positiveResult);
    }

    public void onProgressChanged(SeekBar seekBar, int progress, boolean fromTouch) {
        coSeekBarValView.setText((ciMinVal+progress)+csUnit);
        this.setSummary((ciMinVal+progress)+csUnit);
    }

    @Override
    public void onStartTrackingTouch(SeekBar seekBar) {
        // TODO Auto-generated method stub

    }

    @Override
    public void onStopTrackingTouch(SeekBar seekBar) {
        // TODO Auto-generated method stub

    }
}

3、SeekBar的布局xml：
<?xml version="1.0" encoding="UTF-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:orientation="vertical"
        android:paddingTop="10px"
        android:paddingLeft="10px"
        android:paddingRight="10px"
        android:paddingBottom="10px"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent">

    <SeekBar
        android:id="@+id/SeekBarControl"
        android:paddingLeft="10px"
        android:paddingRight="10px"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"/>

    <RelativeLayout
        android:layout_width="fill_parent"
        android:layout_height="fill_parent">

        <TextView
            android:id="@+id/SeekBarMin"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentLeft="true"
            android:textSize="18px"
            android:text="Min" />

        <TextView
            android:id="@+id/SeekBarVal"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerHorizontal="true"
            android:textSize="18px"
            android:text="" />

        <TextView
            android:id="@+id/SeekBarMax"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentRight="true"
            android:textSize="18px"
            android:text="Max" />

    </RelativeLayout>

</LinearLayout>