android之SeekBar控件用法

MainActivity.java

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;
    }

}

activity_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"
         >

<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>