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MeiTuanRefreshListView高仿美团下拉刷新，
本项目来自：https://github.com/nugongshou110/MeiTuanRefreshListView
项目主要构成部分：自定义MeiTuanRefreshFirstStepView，MeiTuanRefreshSecondStepView，
MeiTuanRefreshThirdStepView，其中自定义MeiTuanListView 继承了ListView实现的，
部分代码如下：
public class MeiTuanListView 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 = 3;
private LinearLayout headerView;
private int headerViewHeight;
private float startY;
private float offsetY;
private TextView tv_pull_to_refresh;
private OnMeiTuanRefreshListener mOnRefreshListener;
private int state;
private int mFirstVisibleItem;
private boolean isRecord;
private boolean isEnd;
private boolean isRefreable;
private FrameLayout mAnimContainer;
private Animation animation;
private SimpleDateFormat format;
private MeiTuanRefreshFirstStepView mFirstView;
private MeiTuanRefreshSecondStepView mSecondView;
private AnimationDrawable secondAnim;
private MeiTuanRefreshThirdStepView mThirdView;
private AnimationDrawable thirdAnim;
public MeiTuanListView(Context context) {
super(context);
init(context);
}
public MeiTuanListView(Context context, AttributeSet attrs) {
super(context, attrs);
init(context);
}
public MeiTuanListView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init(context);
}
public interface OnMeiTuanRefreshListener{
void onRefresh();
}
public void setOnMeiTuanRefreshListener(OnMeiTuanRefreshListener 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.meituan_item, null, false);
mFirstView = (MeiTuanRefreshFirstStepView) headerView.findViewById(R.id.first_view);
tv_pull_to_refresh = (TextView) headerView.findViewById(R.id.tv_pull_to_refresh);
mSecondView = (MeiTuanRefreshSecondStepView) headerView.findViewById(R.id.second_view);
mSecondView.setBackgroundResource(R.drawable.pull_to_refresh_second_anim);
secondAnim = (AnimationDrawable) mSecondView.getBackground();
mThirdView = (MeiTuanRefreshThirdStepView) headerView.findViewById(R.id.third_view);
mThirdView.setBackgroundResource(R.drawable.pull_to_refresh_third_anim);
thirdAnim = (AnimationDrawable) mThirdView.getBackground();
measureView(headerView);
addHeaderView(headerView);
headerViewHeight = headerView.getMeasuredHeight();
headerView.setPadding(0, -headerViewHeight, 0, 0);
Log.i("zhangqi","headerViewHeight="+headerViewHeight);
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/RATIO<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/RATIO>=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) {
headerView.setPadding(0,(int)(-headerViewHeight+offsetY/RATIO) ,0,0);
mFirstView.setCurrentProgress(currentProgress);
mFirstView.postInvalidate();
}
if (state == RELEASE_TO_REFRESH) {
headerView.setPadding(0,(int)(-headerViewHeight+offsetY/RATIO) ,0, 0);
mFirstView.setCurrentProgress(currentProgress);
mFirstView.postInvalidate();
}
}
break;
case MotionEvent.ACTION_UP:
if (state == PULL_TO_REFRESH) {
this.smoothScrollBy((int)(-headerViewHeight+offsetY/RATIO)+headerViewHeight, 500);
changeHeaderByState(state);
}
if (state == RELEASE_TO_REFRESH) {
this.smoothScrollBy((int)(-headerViewHeight+offsetY/RATIO), 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);
mFirstView.setVisibility(View.VISIBLE);
mSecondView.setVisibility(View.GONE);
secondAnim.stop();
mThirdView.setVisibility(View.GONE);
thirdAnim.stop();
break;
case RELEASE_TO_REFRESH:
tv_pull_to_refresh.setText("放开刷新");
mFirstView.setVisibility(View.GONE);
mSecondView.setVisibility(View.VISIBLE);
secondAnim.start();
mThirdView.setVisibility(View.GONE);
thirdAnim.stop();
break;
case PULL_TO_REFRESH:
tv_pull_to_refresh.setText("下拉刷新");
state = DONE;
mFirstView.setVisibility(View.VISIBLE);
mSecondView.setVisibility(View.GONE);
secondAnim.stop();
mThirdView.setVisibility(View.GONE);
thirdAnim.stop();
break;
case REFRESHING:
tv_pull_to_refresh.setText("正在刷新");
mFirstView.setVisibility(View.GONE);
mThirdView.setVisibility(View.VISIBLE);
mSecondView.setVisibility(View.GONE);
secondAnim.stop();
thirdAnim.start();
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);
}
}
//如何调用呢
mDatas = new ArrayList<String>(Arrays.asList(data));
mAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1,mDatas);
mListView.setAdapter(mAdapter);
mListView.setOnMeiTuanRefreshListener(this);
MeiTuanRefreshListView高仿美团下拉刷新《IT蓝豹》
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原文地址：http://my.oschina.net/u/2461971/blog/526371
