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

 import android.app.Activity;
 import android.os.Bundle;
 import android.widget.SeekBar;
 import android.widget.SeekBar.OnSeekBarChangeListener;
 
 public class MainActivity extends Activity {
     private SeekBar seekbar;
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
 
         seekbar = (SeekBar) findViewById(R.id.seekbar);
         seekbar.setProgress(30);
         seekbar.setSecondaryProgress(50);
         seekbar.setOnSeekBarChangeListener(new SeekBarListener());
     }
 
     class SeekBarListener implements OnSeekBarChangeListener{
         /*
          * 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)
          * progress 指的是当前SeekBar的进度
          * fromUser 表示进度的改变是否来自于用户，是则为true
          * */
         //该方法当进度条变化的时候调用
         public void onProgressChanged(SeekBar seekbar, int progress, boolean fromUser) {
             System.out.println("progress="+progress+",fromUser="+fromUser);
         }
 
         //当用户滑动进度条的时候调用
         public void onStartTrackingTouch(SeekBar seekBar) {
             System.out.println("Onstart");
         }
 
         //当用户终止滑动的时候调用
         public void onStopTrackingTouch(SeekBar seekBar) {
             System.out.println("Onstop");
         }
 
     }
 }

 <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"
     android:paddingBottom="@dimen/activity_vertical_margin"
     android:paddingLeft="@dimen/activity_horizontal_margin"
     android:paddingRight="@dimen/activity_horizontal_margin"
     android:paddingTop="@dimen/activity_vertical_margin"
     tools:context=".MainActivity" >
 
     <SeekBar
         android:id="@+id/seekbar"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:max="100"
         />
 
 </RelativeLayout>

RatingBar：星星，就是用于评价星级

 import android.app.Activity;
 import android.os.Bundle;
 import android.view.View;
 import android.view.View.OnClickListener;
 import android.widget.Button;
 import android.widget.RatingBar;
 import android.widget.RatingBar.OnRatingBarChangeListener;
 
 public class MainActivity extends Activity {
     private RatingBar ratingbar;
     private Button button;
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
 
         ratingbar = (RatingBar) findViewById(R.id.ratingbar);
         ratingbar.setOnRatingBarChangeListener(new RatingBarListener());
         button = (Button)findViewById(R.id.button);
         button.setOnClickListener(new ButtonListener());
 
     }
 
     //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
     class RatingBarListener implements OnRatingBarChangeListener{
         public void onRatingChanged(RatingBar ratingbar, float rating, boolean fromUser) {
             System.out.println("rating="+rating+",fromUser="+fromUser);
         }
     }
 
     class ButtonListener implements OnClickListener{
         public void onClick(View v) {
             ratingbar.setRating(ratingbar.getRating()+0.5f);
         }
     }
 }

 <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"
     android:paddingBottom="@dimen/activity_vertical_margin"
     android:paddingLeft="@dimen/activity_horizontal_margin"
     android:paddingRight="@dimen/activity_horizontal_margin"
     android:paddingTop="@dimen/activity_vertical_margin"
     tools:context=".MainActivity" >
 
     <RatingBar
         android:id="@+id/ratingbar"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:numStars="5"
         android:stepSize="0.5"
         />
 
     <Button
         android:id="@+id/button"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_below="@id/ratingbar"
         android:text="button"
         />
 
 </RelativeLayout>
 <!--
   android:numStars="4"     表示设置多少个星通常都是5个星
   android:progress="3"     设置当前的星数
   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
  -->