a)什么是SeekBar

b)使用SeekBar的步驟:

i.在布局文件當(dāng)中聲明SeekBar:

ii.定義一個(gè)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(jiān)聽器: seekBarSetOnSeekBarChangeListener(new SeekBarListener());

案例項(xiàng)目:

main.xml:

android:orientation="vertical"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

>

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="@string/hello"

/>

android:id="@+id/seekBarId"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

/>

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(shè)置該進(jìn)度條的最大值,默認(rèn)情況下為O

seekBar.setMax(100);

seekBar.setOnSeekBarChangeListener(seekBarListener);

}

/**

* SeekBarListener

* 定義一個(gè)監(jiān)聽器,該監(jiān)聽器負(fù)責(zé)監(jiān)聽進(jìn)度條進(jìn)度的改變

*/

private SeekBar.OnSeekBarChangeListener seekBarListener = new SeekBar.OnSeekBarChangeListener() {

/**

* 當(dāng)用戶結(jié)束對滑塊滑動(dòng)時(shí),調(diào)用該方法

*/

public void onStopTrackingTouch(SeekBar seekBar) {

// TODO Auto-generated method stub

System.out.println("stop: > "+seekBar.getProgress());

}

/**

* 當(dāng)用戶開始滑動(dòng)滑塊時(shí)調(diào)用該方法

*/

public void onStartTrackingTouch(SeekBar seekBar) {

// TODO Auto-generated method stub

System.out.println("start: => "+seekBar.getProgress());

}

/**

* 當(dāng)進(jìn)度條發(fā)生變化時(shí)調(diào)用該方法

*/

public void onProgressChanged(SeekBar seekBar, int progress,

boolean fromUser) {

// TODO Auto-generated method stub

System.out.println(progress);

}

}

圖：

}tu

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