控件_SeekBar与RatingBar

这两种进度条都是ProgressBar的子类

SeekBar：是一种可以拖动的进度条，比如播放音乐的进度

 1 import android.app.Activity;
 2 import android.os.Bundle;
 3 import android.widget.SeekBar;
 4 import android.widget.SeekBar.OnSeekBarChangeListener;
 5 
 6 public class MainActivity extends Activity {
 7     private SeekBar seekbar;
 8     protected void onCreate(Bundle savedInstanceState) {
 9         super.onCreate(savedInstanceState);
10         setContentView(R.layout.activity_main);
11         
12         seekbar = (SeekBar) findViewById(R.id.seekbar);
13         seekbar.setProgress(30);
14         seekbar.setSecondaryProgress(50);
15         seekbar.setOnSeekBarChangeListener(new SeekBarListener());
16     }
17     
18     class SeekBarListener implements OnSeekBarChangeListener{
19         /*
20          * seekbar 该对象指的是触发了监听器的SeekBar对象，就是说哪个SeekBar触发了监听器(因为有可能多个SeekBar绑定到这个监听器上)
21          * progress 指的是当前SeekBar的进度
22          * fromUser 表示进度的改变是否来自于用户，是则为true
23          * */
24         //该方法当进度条变化的时候调用
25         public void onProgressChanged(SeekBar seekbar, int progress, boolean fromUser) {
26             System.out.println("progress="+progress+",fromUser="+fromUser);
27         }
28         
29         //当用户滑动进度条的时候调用
30         public void onStartTrackingTouch(SeekBar seekBar) {
31             System.out.println("Onstart");
32         }
33 
34         //当用户终止滑动的时候调用
35         public void onStopTrackingTouch(SeekBar seekBar) {
36             System.out.println("Onstop");
37         }
38         
39     }
40 }

 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/seekbar"
13         android:layout_width="match_parent"
14         android:layout_height="wrap_content"
15         android:max="100"
16         />
17 
18 </RelativeLayout>

RatingBar：星星，就是用于评价星级

 1 import android.app.Activity;
 2 import android.os.Bundle;
 3 import android.view.View;
 4 import android.view.View.OnClickListener;
 5 import android.widget.Button;
 6 import android.widget.RatingBar;
 7 import android.widget.RatingBar.OnRatingBarChangeListener;
 8 
 9 public class MainActivity extends Activity {
10     private RatingBar ratingbar;
11     private Button button;
12     protected void onCreate(Bundle savedInstanceState) {
13         super.onCreate(savedInstanceState);
14         setContentView(R.layout.activity_main);
15         
16         ratingbar = (RatingBar) findViewById(R.id.ratingbar);
17         ratingbar.setOnRatingBarChangeListener(new RatingBarListener());
18         button = (Button)findViewById(R.id.button);
19         button.setOnClickListener(new ButtonListener());
20         
21         
22     }
23     
24     //该监听器只有onRatingChanged一个方法，第一个参数表示那个对象触发了监听器，第二个参数表示当前星数，第三个参数表示是否来自用户的改变
25     class RatingBarListener implements OnRatingBarChangeListener{
26         public void onRatingChanged(RatingBar ratingbar, float rating, boolean fromUser) {
27             System.out.println("rating="+rating+",fromUser="+fromUser);
28         }
29     }
30     
31     class ButtonListener implements OnClickListener{
32         public void onClick(View v) {
33             ratingbar.setRating(ratingbar.getRating()+0.5f);
34         }
35     }
36 }

 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     <RatingBar
12         android:id="@+id/ratingbar"
13         android:layout_width="wrap_content"
14         android:layout_height="wrap_content"
15         android:numStars="5"
16         android:stepSize="0.5"
17         />
18     
19     <Button 
20         android:id="@+id/button"
21         android:layout_width="wrap_content"
22         android:layout_height="wrap_content"
23         android:layout_below="@id/ratingbar"
24         android:text="button"
25         />
26 
27 </RelativeLayout>
28 <!-- 
29   android:numStars="4"     表示设置多少个星通常都是5个星
30   android:progress="3"     设置当前的星数
31   android:stepSize="0.5"   滑动的时候表示每次请进的距离，0。5就是每次半颗星，1就是一个星
32  -->