ANDROID_MARS学习笔记_S01_012

ANDROID_MARS学习笔记_S01_012_SeekBar

1.xml

 1 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 2     xmlns:tools="http://schemas.android.com/tools"
 3     android:layout_width="match_parent"
 4     android:layout_height="match_parent"
 5     android:paddingBottom="@dimen/activity_vertical_margin"
 6     android:paddingLeft="@dimen/activity_horizontal_margin"
 7     android:paddingRight="@dimen/activity_horizontal_margin"
 8     android:paddingTop="@dimen/activity_vertical_margin"
 9     tools:context=".MainActivity" >
10 
11     <SeekBar 
12         android:id="@+id/firstSeekBar"
13         android:layout_width="match_parent"
14         android:layout_height="wrap_content"
15         android:max="100"
16         />
17 </RelativeLayout>

2.java

 1 package com.marschen.s01_e18_seekbar;
 2 
 3 import android.app.Activity;
 4 import android.os.Bundle;
 5 import android.view.Menu;
 6 import android.widget.SeekBar;
 7 import android.widget.SeekBar.OnSeekBarChangeListener;
 8 
 9 public class MainActivity extends Activity {
10 
11     private SeekBar seekBar;
12     @Override
13     protected void onCreate(Bundle savedInstanceState) {
14         super.onCreate(savedInstanceState);
15         setContentView(R.layout.activity_main);
16         
17         seekBar = (SeekBar)findViewById(R.id.firstSeekBar);
18         seekBar.setProgress(30);
19         seekBar.setSecondaryProgress(50);
20         
21         SeekBarListener listener = new SeekBarListener();
22         seekBar.setOnSeekBarChangeListener(listener);
23     }
24     
25     class SeekBarListener implements OnSeekBarChangeListener{
26 
27         /**
28          * seekBar 该对象指的是触发了监听器的SeekBar对象
29          * progress 指的是当前SeekBar的进度
30          * fromUser 
31          */
32         @Override
33         public void onProgressChanged(SeekBar SeekBar, int progress, boolean fromUser) {
34             System.out.println("progress:" + progress + ",fromUser:" + fromUser);
35         }
36 
37         @Override
38         public void onStartTrackingTouch(SeekBar seekBar) {
39             System.out.println("onStart");
40         }
41 
42         @Override
43         public void onStopTrackingTouch(SeekBar seekBar) {
44             System.out.println("onStop");
45         }
46         
47     }
48 
49     @Override
50     public boolean onCreateOptionsMenu(Menu menu) {
51         // Inflate the menu; this adds items to the action bar if it is present.
52         getMenuInflater().inflate(R.menu.main, menu);
53         return true;
54     }
55 
56 }