Android SeekBar实现滑动条效果

<?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="245px"     android:layout_height="25px" android:paddingLeft="16px"     android:paddingRight="15px" android:paddingTop="5px"     android:paddingBottom="5px" android:progress="0" android:max="0"     android:secondaryProgress="0" />   <TextView android:layout_width="fill_parent"     android:layout_height="wrap_content" android:text="@string/hello"     android:id="@+id/TextView01" /> </LinearLayout> 

package com.esri.arcgis.sample;  import android.app.Activity; import android.os.Bundle; import android.widget.SeekBar; import android.widget.SeekBar.OnSeekBarChangeListener; import android.widget.TextView; import android.widget.Toast;  public class AndroidSeekBar extends Activity {   /** Called when the activity is first created. */   @Override   public void onCreate(Bundle savedInstanceState) {     super.onCreate(savedInstanceState);     setContentView(R.layout.main);      // 找到拖动条和文本框     final SeekBar sb = (SeekBar) findViewById(R.id.SeekBar01);     final TextView tv1 = (TextView) findViewById(R.id.TextView01);      // 设置拖动条的初始值和文本框的初始值     sb.setMax(100);     sb.setProgress(30);     tv1.setText("当前进度：" + sb.getProgress());      // 设置拖动条改变监听器     OnSeekBarChangeListener osbcl = new OnSeekBarChangeListener() {        @Override       public void onProgressChanged(SeekBar seekBar, int progress,           boolean fromUser) {         tv1.setText("当前进度：" + sb.getProgress());         Toast.makeText(getApplicationContext(), "onProgressChanged",             Toast.LENGTH_SHORT).show();       }        @Override       public void onStartTrackingTouch(SeekBar seekBar) {         Toast.makeText(getApplicationContext(), "onStartTrackingTouch",             Toast.LENGTH_SHORT).show();       }        @Override       public void onStopTrackingTouch(SeekBar seekBar) {         Toast.makeText(getApplicationContext(), "onStopTrackingTouch",             Toast.LENGTH_SHORT).show();       }      };      // 为拖动条绑定监听器     sb.setOnSeekBarChangeListener(osbcl);    } }