Android-高级UI控件_SeekBar拖动条

代码

package com.lxt008;

import android.app.Activity;
import android.os.Bundle;
import android.widget.SeekBar;
import android.widget.TextView;

public class Activity01 extends Activity 
                        implements SeekBar.OnSeekBarChangeListener
{
    //声明SeekBar对象
    SeekBar        mSeekBar;
    TextView    mProgressText;
    TextView    mTrackingText;


    /** Called when the activity is first created. */
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);
        //取得SeekBar对象
        mSeekBar = (SeekBar) findViewById(R.id.seek);
        mSeekBar.setOnSeekBarChangeListener(this);
        mProgressText = (TextView) findViewById(R.id.progress);
        mTrackingText = (TextView) findViewById(R.id.tracking);
    }

    //在拖动中--即值在改变
    public void onProgressChanged(SeekBar seekBar, int progress, boolean fromTouch)
    {
        mProgressText.setText("当前值："+progress);
    }
    public void onStartTrackingTouch(SeekBar seekBar)
    {
        mTrackingText.setText("正在调节");
    }
    //停止拖动
    public void onStopTrackingTouch(SeekBar seekBar)
    {
        mTrackingText.setText("停止调节");
    }
}

布局文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">

    <SeekBar android:id="@+id/seek"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:max="100"
        android:progress="50"
        android:secondaryProgress="75" />

    <TextView android:id="@+id/progress"
           android:layout_width="fill_parent"
        android:layout_height="wrap_content" />

    <TextView android:id="@+id/tracking"
           android:layout_width="fill_parent"
        android:layout_height="wrap_content" />
</LinearLayout>