Android组件 拖动条(SeekBar)

/res/layout/main.xml代码如下:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <SeekBar 
        android:id="@+id/mySeekBar"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:max="100"
        android:progress="30"
        android:secondaryProgress="50"/>
    
    <TextView 
        android:id="@+id/myProgress"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"/>
    
    <TextView 
        android:id="@+id/myTracking"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"/>
</LinearLayout>

Java代码如下:

package com.demo.android.ui;

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

public class SeekBarActivity extends Activity {
	private TextView myProgress;
	private TextView myTracking;
	private SeekBar mySeekBar;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        myProgress=(TextView) findViewById(R.id.myProgress);
        myTracking=(TextView) findViewById(R.id.myTracking);
        mySeekBar=(SeekBar) findViewById(R.id.mySeekBar);
        
        mySeekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
			
        	/**
        	 * 停止拖动拖动条时触发该方法
        	 */
			@Override
			public void onStopTrackingTouch(SeekBar seekBar) {
				myTracking.setText("TrackingTouch stop....");
			}
			
			/**
			 * 开始拖动拖动条时触发该方法
			 */
			@Override
			public void onStartTrackingTouch(SeekBar seekBar) {
				myTracking.setText("TrackingTouch start....");
			}
			
			/**
			 * 拖动条改变时触发该事件
			 * 参数一:当前操作的拖动条
			 * 参数二:当前拖动条的值
			 */
			@Override
			public void onProgressChanged(SeekBar seekBar, int progress,boolean fromUser) {
				myProgress.setText(progress+" onProgressChanged = "+fromUser);
			}
		});
    }
}

 


 

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