拖動條(SeekBar)

拖動條(SeekBar)是進度條(ProgressBar)的擴展類，它增加了一個拖動拇指. 用戶可以拖動拇指向左或向右(或使用箭頭鍵)來設置目前的進度.



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:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:layout_margin="10px"
    android:id="@+id/seekbar"
    android:max="100"
    android:progress="50"
    />
<TextView  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:id="@+id/seekbarvalue"
    android:text="50"
    />
</LinearLayout>

主程序

package com.AndroidSeekBar;

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

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);
        
        SeekBar seekBar = (SeekBar)findViewById(R.id.seekbar);
        final TextView seekBarValue = (TextView)findViewById(R.id.seekbarvalue);
        
        seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener(){

   @Override
   public void onProgressChanged(SeekBar seekBar, int progress,
     boolean fromUser) {
    // TODO Auto-generated method stub
    seekBarValue.setText(String.valueOf(progress));
   }

   @Override
   public void onStartTrackingTouch(SeekBar seekBar) {
    // TODO Auto-generated method stub
   }

   @Override
   public void onStopTrackingTouch(SeekBar seekBar) {
    // TODO Auto-generated method stub
   }
        });
    }
}