SeekBar可以作为音乐播放器的进度指示和调整工具，音量调整工具等，SeekBar是ProgressBar的一个子类，下面我们用一个可以改变并显示当前进度的拖动条例子来演示一下它的使用：
1、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">
</seekbar>
<textview android:id="@+id/TextView01" android:textsize="25sp" android:layout_width="fill_parent" android:layout_height="wrap_content">
</textview>
</linearlayout>
2、java：
package android.basic.lesson11;
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 MainHelloSeekBar 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);
}
}
3、运行程序：
