android开发_SeekBar进度条

项目结构：

New Android Project->
Project name:SeekBar
Build Target:Android 2.2
Application name: SeekBar
Package name:com.b510
Create Activity:HelloSeekBar
Min SDK Version:9
Finish

运行效果：

代码部分：

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="Seek Bar Demo"
        />
     <SeekBar
         android:id="@+id/sb_test_id"
         android:layout_width="fill_parent"
         android:layout_height="wrap_content"
     />   
</LinearLayout>

HelloSeekBar.java

package com.b510;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.widget.SeekBar;
import android.widget.Toast;
import android.widget.SeekBar.OnSeekBarChangeListener;

public class HelloSeekBar extends Activity {
    private static final String TAG = "HelloSeekBar";
    /* 申明一个SeekBar变量 */
    private SeekBar sb_test;
    
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        sb_test = (SeekBar) findViewById(R.id.sb_test_id);
        // 进度条的最大值
        sb_test.setMax(100);
        sb_test.setOnSeekBarChangeListener(listener);
    }
    
    // 定义一个监听器，该监听器负责监听进度条状态的改变
    private OnSeekBarChangeListener listener = new OnSeekBarChangeListener() {
        // 当用户停止滑动滑块的时候，调用此方法
        @Override
        public void onStopTrackingTouch(SeekBar seekBar) {
            Log.i(TAG, "on  Stop  Tracking  Touch方法,当前位置: "
                    + seekBar.getProgress());
            Toast.makeText(HelloSeekBar.this, "onStopTrackingTouch方法",
                    Toast.LENGTH_LONG).show();
        }

        // 当用户开始滑动滑块的时候，调用此方法
        @Override
        public void onStartTrackingTouch(SeekBar seekBar) {
            Log.i(TAG, "on    Start   Tracking   Touch方法,当前位置: "
                    + seekBar.getProgress());
            Toast.makeText(HelloSeekBar.this, "onStartTrackingTouch方法",
                    Toast.LENGTH_LONG).show();
        }

        // 当进度条的进度方式变化的时候，就会调用这个方法
        // 只要进度条的滑块发生变化，无论滑块是怎样变化的，都会调用此方法
        @Override
        public void onProgressChanged(SeekBar seekBar, int progress,
                boolean fromUser) {
            Log.i(TAG, "on  Progress   Changed方法,当前位置: "
                    + seekBar.getProgress());
            Toast.makeText(HelloSeekBar.this, "onProgressChanged方法",
                    Toast.LENGTH_LONG).show();
        }
    };
}