SeekBar 可拖拽进度条

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SeekBar 可拖拽进度条一般用于播放器中，控制播放进度。

xml代码如下

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context="${packageName}.${activityClass}" >    <SeekBar        android:id="@+id/firstSeekBar"        android:layout_width="match_parent"        android:layout_height="wrap_content"        /></RelativeLayout>

java代码如下

package com.wyb.s01_e18_seekbar;import android.app.Activity;import android.os.Bundle;import android.widget.SeekBar;import android.widget.SeekBar.OnSeekBarChangeListener;public class MainActivity extends Activity {private SeekBar firstSeekBar;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);firstSeekBar = (SeekBar)findViewById(R.id.firstSeekBar);firstSeekBar.setMax(100);firstSeekBar.setProgress(30);firstSeekBar.setSecondaryProgress(50);firstSeekBar.setOnSeekBarChangeListener(new SeekBarListener());}class SeekBarListener implements OnSeekBarChangeListener{/** * seekBar 该对象指的是触发了监听器的seekBar对象 * progress 指的是当前seekBar的当前进度 * fromUser 判断是否由用户拖拽导致进度条变化 */@Overridepublic void onProgressChanged(SeekBar seekBar, int progress,boolean fromUser) {// TODO Auto-generated method stubSystem.out.println("progress "+progress+" fromUser "+fromUser);}@Overridepublic void onStartTrackingTouch(SeekBar seekBar) {// TODO Auto-generated method stubSystem.out.println("onStar!");}@Overridepublic void onStopTrackingTouch(SeekBar seekBar) {// TODO Auto-generated method stubSystem.out.println("onStop!");}}}

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