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

  -->