android自己写的类似刻度尺的东西(13)

                    break; 
            } 
                return true; 
        } 
         
        public float getResult(){ 
            return result; 
        } 
    } 
     
     
    @Override 
    public boolean onKeyDown(int keyCode, KeyEvent event) { 
        if(keyCode == KeyEvent.KEYCODE_VOLUME_DOWN){ 
            staff.isInit = false; 
            staff.draw(-1); 
            return true; 
        }if(keyCode == KeyEvent.KEYCODE_VOLUME_UP){ 
            staff.isInit = false; 
            staff.draw(1); 
            return true; 
        } 
        return super.onKeyDown(keyCode, event); 
    } 
} 
 布局文件：
Xml代码 
<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout 
  xmlns:android="http://schemas.android.com/apk/res/android" 
  android:orientation="vertical" 
  android:layout_width="fill_parent" 
  android:layout_height="fill_parent" 
  android:gravity="center" 
  android:background="#fff"> 
    <LinearLayout  
        android:id="@+id/kedu_linear"  
        android:layout_width="294dp"  
        android:layout_height="101dp"/> 
    <ImageView  
        android:layout_height="wrap_content"   
        android:layout_width="wrap_content"