SeekBar拖动条的基本使用

SeekBar,拖动条，见到的较多，如地图上，放大缩小，音乐播放时声音的放大缩小等

main.xml:

<?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/seekbar01"
     android:layout_width="fill_parent"
     android:layout_height="wrap_content"
     android:max="100"
     android:progress="50"
     android:secondaryProgress="75"
      />
     <TextView 
     android:id="@+id/textview01" 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 
     />
     <TextView  
     android:id="@+id/textview02"
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 
     />
 </LinearLayout>

TestSeekBarAcitivty:

import android.app.Activity;
 import android.os.Bundle;
 import android.widget.SeekBar;
 import android.widget.TextView;
 import android.widget.SeekBar.OnSeekBarChangeListener;
 
 public class TestSeekBarAcitivty extends Activity implements OnSeekBarChangeListener
 {
     private SeekBar seekbar;
     private TextView textView01;
     private TextView textView02;
     @Override
     public void onCreate(Bundle savedInstanceState)
     {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.main);
         seekbar = (SeekBar) findViewById(R.id.seekbar01);
         seekbar.setOnSeekBarChangeListener(this);
         textView01 = (TextView) findViewById(R.id.textview01);
         textView02 = (TextView) findViewById(R.id.textview02);
     }
     @Override
     public void onProgressChanged(SeekBar seekBar, int progress, boolean fromTouch)
     {
         textView01.setText("当前值:"+progress);
     }
     @Override
     public void onStartTrackingTouch(SeekBar arg0)
     {
         textView02.setText("正在调解");
     }
     @Override
     public void onStopTrackingTouch(SeekBar arg0)
     {
         textView02.setText("停止调解");
     }
 }