AndroidドロップダウンPtrFrame Layoutの使用例コードを更新します。

compile 'in.srain.cube:ultra-ptr:1.0.11'

<in.srain.cube.views.ptr.PtrFrameLayout
 xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:tools="http://schemas.android.com/tools"
 xmlns:app="http://schemas.android.com/apk/res-auto"
 android:id="@+id/food_refreshLayout"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 app:ptr_resistance="1.7"       //         ，         
 app:ptr_ratio_of_header_height_to_refresh="1.2"  //          ，          
 app:ptr_duration_to_close="200"        //：         
 app:ptr_duration_to_close_header="300"  //     ，      ，          
 app:ptr_keep_header_when_refresh="true"  //             
 app:ptr_pull_to_fresh="false">    //           ，       false

 <ScrollView
   android:layout_width="match_parent"
   android:layout_height="match_parent"
  >
  </ScrollView>

</in.srain.cube.views.ptr.PtrFrameLayout>

mFoodRefreshLayout = (PtrFrameLayout) findViewById(R.id.food_refreshLayout);
//               ,           new PtrDefaultHandler(); 
PtrClassicHeader header = new PtrClassicHeader(this); 
//      
mFoodRefreshLayout.addPtrUIHandler(header);

mFoodRefreshLayout.setHeaderView(header); //       

mFoodRefreshLayout.setPtrHandler(new PtrHandler() {
 @Override
 public void onRefreshBegin(PtrFrameLayout frame) {
  //               
  //       
   mFoodRefreshLayout.refreshComplete();
 }

 @Override
 public boolean checkCanDoRefresh(PtrFrameLayout frame, View content, View header) {
   //     ，         
   return PtrDefaultHandler.checkContentCanBePulledDown(frame, content, header);
 }
});

public class PtrClassicHeader extends FrameLayout implements PtrUIHandler{ //    
  private ImageView mPush;
  //       
  public PtrClassicHeader(Context context) {
    super(context);
    initView();  
  }
  public PtrClassicHeader(Context context, AttributeSet attrs) {
    super(context, attrs);
    initView();
  }
  public PtrClassicHeader(Context context, AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
    initView();
  }

  //          
  private void initView() {
  //            
  View header =  LayoutInflater.from(getContext()).inflate(R.layout.item_push_header_layout, this);
  //         
    mPush = (ImageView) header.findViewById(R.id.header_iv);
  }

  //      ,       
  public void initAnim(){
    ObjectAnimator anim = ObjectAnimator.ofFloat(mPush, "rotation", 0f, 180f);
    anim.setDuration(500);
    anim.start();

  }
  //     
  @Override
  public void onUIReset(PtrFrameLayout frame) {
    //                     
  }

  //          
  @Override
  public void onUIRefreshPrepare(PtrFrameLayout frame) {
      initAnim(); //          
  }

  //       
  @Override
  public void onUIRefreshBegin(PtrFrameLayout frame) {
      //                    
      //         
    if (frame.isPullToRefresh()) {
      mTitleTextView.setText("    ");
    } else {
      mTitleTextView.setText("    ");
    }
  }

  //       ,       
  @Override
  public void onUIRefreshComplete(PtrFrameLayout frame) {
    //                    
     mTitleTextView.setText("   ...");
    animationDrawable.stop(); //    
    animationDrawable.start();
  }

  //    
  @Override
  public void onUIPositionChange(PtrFrameLayout frame, boolean isUnderTouch, byte status, PtrIndicator ptrIndicator) {
    //               ,            
    //    :         
    final int mOffsetToRefresh = frame.getOffsetToRefresh();
    final int currentPos = ptrIndicator.getCurrentPosY(); //        
    final int lastPos = ptrIndicator.getLastPosY();   //       
    //              
    if (currentPos < mOffsetToRefresh && lastPos >= mOffsetToRefresh) {
      if (isUnderTouch && status == PtrFrameLayout.PTR_STATUS_PREPARE) {
        crossRotateLineFromBottomUnderTouch(frame); //    
      }
    } else if (currentPos > mOffsetToRefresh && lastPos <= mOffsetToRefresh) {
      if (isUnderTouch && status == PtrFrameLayout.PTR_STATUS_PREPARE) {
        crossRotateLineFromTopUnderTouch(frame); //    
      }
    }
  }
  //          
  private void crossRotateLineFromTopUnderTouch(PtrFrameLayout frame) {
    if (!frame.isPullToRefresh()) {
      mTitleTextView.setText("    ");
    }
  }
  //      
  private void crossRotateLineFromBottomUnderTouch(PtrFrameLayout frame) {
    if (frame.isPullToRefresh()) {
      mTitleTextView.setText("    ");
    } else {
      mTitleTextView.setText("    ");
    }
  }
  }
}