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AutoHomeRefreshListView仿汽车之家下拉刷新

AutoHomeRefreshListView 高仿汽车之家下拉刷新，下拉的时候出现很不错的效果。
本项目来自：https://github.com/nugongshou110/AutoHomeRefreshListView
首先是自定义AutoHomeListView，继承ListView实现的
重要代码如下：

public class AutoHomeListView extends ListView implements AbsListView.OnScrollListener{
   private static final int DONE = 0;
   private static final int PULL_TO_REFRESH = 1;
   private static final int RELEASE_TO_REFRESH = 2;
   private static final int REFRESHING = 3;
   private static final int RATIO = 4;
   private LinearLayout headerView;
   private AutoHome mAutoHome;
   private int headerViewHeight;
   private float startY;
   private float currentProgress;
   private int currentHeight;
   private float offsetY;
   private TextView tv_pull_to_refresh;
   private OnAutoHomeRefreshListener mOnRefreshListener;
   private int state;
   private int mFirstVisibleItem;
   private boolean isRecord;
   private boolean isEnd;
   private boolean isRefreable;
   private FrameLayout mAnimContainer;
   private PointerView mAutoHomeAnim;
   private Animation animation;

   public AutoHomeListView(Context context) {
       super(context);
       init(context);
   }

   public AutoHomeListView(Context context, AttributeSet attrs) {
       super(context, attrs);
       init(context);
   }

   public AutoHomeListView(Context context, AttributeSet attrs, int defStyleAttr) {
       super(context, attrs, defStyleAttr);
       init(context);
   }

   public interface OnAutoHomeRefreshListener{
       void onRefresh();
   }
   public void setOnAutoHomeRefreshListener(OnAutoHomeRefreshListener onRefreshListener){
       mOnRefreshListener = onRefreshListener;
       isRefreable = true;
   }
   public void setOnRefreshComplete(){
       isEnd = true;
       state = DONE;
       changeHeaderByState(state);
   }

   private void init(Context context) {
       setOverScrollMode(View.OVER_SCROLL_NEVER);
       setOnScrollListener(this);

       headerView = (LinearLayout) LayoutInflater.from(context).inflate(R.layout.autohome_item, null, false);
       mAutoHome = (AutoHome) headerView.findViewById(R.id.auto_home);
       tv_pull_to_refresh = (TextView) headerView.findViewById(R.id.tv_pull_to_refresh);
       mAnimContainer = (FrameLayout) headerView.findViewById(R.id.anim_container);
       mAutoHomeAnim = (PointerView) headerView.findViewById(R.id.anim_pointer);

       animation = AnimationUtils.loadAnimation(context, R.anim.pointer_rotate);

       measureView(headerView);
       addHeaderView(headerView);
       headerViewHeight = headerView.getMeasuredHeight();
       headerView.setPadding(0, -headerViewHeight, 0, 0);

       state = DONE;
       isEnd = true;
       isRefreable = false;
   }

   @Override
   public void onScrollStateChanged(AbsListView absListView, int i) {
   }
   @Override
   public void onScroll(AbsListView absListView, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
       mFirstVisibleItem = firstVisibleItem;
   }

   @Override
   public boolean onTouchEvent(MotionEvent ev) {
       if (isEnd) {
           if (isRefreable) {
               switch (ev.getAction()){
               case MotionEvent.ACTION_DOWN:
                   if (mFirstVisibleItem == 0 && !isRecord) {
                       isRecord = true;
                       startY = ev.getY();
                   }
                   break;
               case MotionEvent.ACTION_MOVE:
                   float tempY = ev.getY();
                   if (mFirstVisibleItem == 0 && !isRecord) {
                       isRecord = true;
                       startY = tempY;
                   }
                   if (state!=REFRESHING && isRecord ) {
                       offsetY = tempY - startY;
                       float currentHeight = (-headerViewHeight+offsetY/3);
                       float currentProgress = 1+currentHeight/headerViewHeight;
                       if (currentProgress>=1) {
                           currentProgress = 1;
                       }
                       if (state == RELEASE_TO_REFRESH && isRecord) {
                           setSelection(0);
                           if (-headerViewHeight+offsetY/3<0) {
                               state = PULL_TO_REFRESH;
                               changeHeaderByState(state);
                           }else if (offsetY<=0) {
                               state = DONE;
                               changeHeaderByState(state);
                           }
                       }
                       if (state == PULL_TO_REFRESH && isRecord) {
                           setSelection(0);
                           if (-headerViewHeight+offsetY/3>=0) {
                               state = RELEASE_TO_REFRESH;
                               changeHeaderByState(state);
                           }else if (offsetY<=0) {
                               state = DONE;
                               changeHeaderByState(state);
                           }
                       }
                       if (state == DONE && isRecord) {
                           if (offsetY>=0) {
                               state = PULL_TO_REFRESH;
                           }
                       }
                       if (state == PULL_TO_REFRESH) {
                           Log.i("zhangqi", ""+(int)(-headerViewHeight+offsetY/3));
                           headerView.setPadding(0,(int)(-headerViewHeight+offsetY/3) ,0,0);
                           mAutoHome.setCurrentProgress(currentProgress);
                           mAutoHome.postInvalidate();
                       }
                       if (state == RELEASE_TO_REFRESH) {
                           headerView.setPadding(0,(int)(-headerViewHeight+offsetY/3) ,0, 0);
                           mAutoHome.setCurrentProgress(currentProgress);
                           mAutoHome.postInvalidate();
                       }
                   }


                   break;
               case MotionEvent.ACTION_UP:
                   if (state == PULL_TO_REFRESH) {
                       this.smoothScrollBy((int)(-headerViewHeight+offsetY/3)+headerViewHeight, 500);
                       changeHeaderByState(state);
                   }
                   if (state == RELEASE_TO_REFRESH) {
                       this.smoothScrollBy((int)(-headerViewHeight+offsetY/3), 500);
                       state = REFRESHING;
                       mOnRefreshListener.onRefresh();
                       changeHeaderByState(state);
                   }
                   isRecord = false;
                   break;
               }

           }
       }
       return super.onTouchEvent(ev);
   }

   private void changeHeaderByState(int state){
       switch (state) {
       case DONE:
           headerView.setPadding(0, -headerViewHeight, 0, 0);
           mAutoHome.setVisibility(View.VISIBLE);
           mAutoHomeAnim.clearAnimation();
           mAnimContainer.setVisibility(View.GONE);
           break;
       case RELEASE_TO_REFRESH:
           tv_pull_to_refresh.setText("放开刷新");

           break;
       case PULL_TO_REFRESH:
           tv_pull_to_refresh.setText("下拉刷新");
           state = DONE;
           mAutoHome.setVisibility(View.VISIBLE);
           mAutoHomeAnim.clearAnimation();
           mAnimContainer.setVisibility(View.GONE);
           break;
       case REFRESHING:
           tv_pull_to_refresh.setText("正在刷新");
           mAutoHome.setVisibility(View.GONE);
           mAnimContainer.setVisibility(View.VISIBLE);
           mAutoHomeAnim.clearAnimation();
           mAutoHomeAnim.startAnimation(animation);
           break;
       default:
           break;
       }
   }


   private void measureView(View child) {
       ViewGroup.LayoutParams p = child.getLayoutParams();
       if (p == null) {
           p = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
                   ViewGroup.LayoutParams.WRAP_CONTENT);
       }
       int childWidthSpec = ViewGroup.getChildMeasureSpec(0, 0 + 0, p.width);
       int lpHeight = p.height;
       int childHeightSpec;
       if (lpHeight > 0) {
           childHeightSpec = MeasureSpec.makeMeasureSpec(lpHeight,
                   MeasureSpec.EXACTLY);
       } else {
           childHeightSpec = MeasureSpec.makeMeasureSpec(0,
                   MeasureSpec.UNSPECIFIED);
       }
       child.measure(childWidthSpec, childHeightSpec);
   }

}

//如何调用
        mAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,mDatas);
        mListView = (AutoHomeListView) findViewById(R.id.listview);
        mListView.setAdapter(mAdapter);
        mListView.setOnAutoHomeRefreshListener(this);