android之SeekBar控件用法详解

package com.example.mars_2400_seekbar;

import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
import android.app.Activity;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;
import android.widget.TextView;
import android.os.Build;

public class MainActivity extends Activity implements OnSeekBarChangeListener {
  private TextView tv;
  private SeekBar sb;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    tv = (TextView) findViewById(R.id.textView1);
    sb = (SeekBar) findViewById(R.id.seekbar);
    sb.setOnSeekBarChangeListener(this);
  }

  @Override
  public void onProgressChanged(SeekBar seekBar, int progress,
      boolean fromUser) {
    // TODO Auto-generated method stub
    tv.setText("Progress is " + progress
        + (fromUser ? " Trigger" : " Nontrigger") + " by user.");
  }


 　　　　@Override
  　　　　public void onStartTrackingTouch(SeekBar seekBar) {
    　　　　　　// TODO Auto-generated method stub
  	　　　　　　System.out.println("onStart-->"+seekBar.getProgress());
  　　　　}

 　　　　@Override
  　　　　public void onStopTrackingTouch(SeekBar seekBar) {
    　　　　　　// TODO Auto-generated method stub
  	　　　　　　System.out.println("onStop-->"+seekBar.getProgress());
  　　　　}


  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
  }

}

<?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"
     >
 
<TextView android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:id="@+id/textView1"/>

<SeekBar android:id="@+id/seekbar"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"/>
 </LinearLayout>