SeekBar的基本使用方法

a)         什麼是SeekBar

b)         使用SeekBar的步驟:

                                       i.              在布局檔案當中聲明SeekBar: <SekBar android:id=”@+id/seekbarld” android:layout_width=”fill_parent” android:layout_height=”wrap_content”/>

                                     ii.              定義一個OnSeekBarChangeListener: private class SeekBarListener implements SeekBar.OnSeekBarChangeListener{public void onProgressChanged(SeekBar seekBar,int progress,Boolean fromUser){System.out.println(progress);} public void onStartTrackingTouch(SeekBar seekBar){System.out.println(“start:=>”+seekBar.getProgress());} public void onStopTrackingTouch(SeekBar seekBar){System.out.println(“begin:=>”+seekBar.getProgress());}}

                                    iii.              為SeekBar綁定監聽器: seekBarSetOnSeekBarChangeListener(new SeekBarListener());

案例項目:

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:text="@string/hello"
    />
    <SeekBar
     android:id="@+id/seekBarId"
     android:layout_width="fill_parent"
     android:layout_height="wrap_content"
     />
</LinearLayout>
SeekBarJsd.java:

package com.jsd;

import android.app.Activity;
import android.os.Bundle;
import android.widget.SeekBar;

/**
 * SeekBar Progress
 * @author Administrator
 *
 */
public class SeekBarJsd extends Activity {
  
 private SeekBar seekBar = null;
 
 /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        seekBar = (SeekBar) findViewById(R.id.seekBarId);
        //設定該進度條的最大值,預設情況下為O
        seekBar.setMax(100);
        seekBar.setOnSeekBarChangeListener(seekBarListener);
    }
    
    /**
     * SeekBarListener 
     * 定義一個監聽器,該監聽器負責監聽進度條進度的改變
     */
    private SeekBar.OnSeekBarChangeListener seekBarListener = new SeekBar.OnSeekBarChangeListener() {
  
     /**
      * 當使用者結束對滑塊滑動時,調用該方法
      */
  public void onStopTrackingTouch(SeekBar seekBar) {
   // TODO Auto-generated method stub
   System.out.println("stop: > "+seekBar.getProgress());
  }
  
  /**
   * 當使用者開始滑動滑塊時調用該方法
   */
  public void onStartTrackingTouch(SeekBar seekBar) {
   // TODO Auto-generated method stub
   System.out.println("start: => "+seekBar.getProgress());
  }
  
  /**
   * 當進度條發生變化時調用該方法
   */
  public void onProgressChanged(SeekBar seekBar, int progress,
    boolean fromUser) {
   // TODO Auto-generated method stub
   System.out.println(progress);
  }
 }

圖：
}tu