仿QQ自定义ListView 下拉刷新

package me.maxwin; import java.util.ArrayList; import me.maxwin.view.XListView; import me.maxwin.view.XListView.IXListViewListener; import me.maxwin.view.XListView.RemoveListener; import android.app.Activity; import android.content.Context; import android.content.Intent; import android.os.Bundle; import android.os.Handler; import android.view.View; import android.widget.AdapterView; import android.widget.AdapterView.OnItemClickListener; public class XListViewActivity extends Activity implements IXListViewListener ,RemoveListener,OnItemClickListener{ private XListView mListView; // private ArrayAdapter<String> mAdapter; private ItemAdapter adapter; // private Context context; private ArrayList<String> items = new ArrayList<String>(); private Handler mHandler; private int start = 0; private static int refreshCnt = 0; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); geneItems(); init(); mHandler = new Handler(); } private void init() { // TODO Auto-generated method stub mListView = (XListView) findViewById(R.id.xListView); mListView.setPullLoadEnable(true); mListView.setRemoveListener(this); mListView.setOnItemClickListener(this); // mListView.setPullLoadEnable(false); // mListView.setPullRefreshEnable(false); mListView.setXListViewListener(this); adapter=new ItemAdapter(this); adapter.setData(items); mListView.setAdapter(adapter); } private void geneItems() { for (int i = 0; i != 20; ++i) { items.add("refresh cnt " + (++start)); } } private void onLoad() { mListView.stopRefresh(); mListView.stopLoadMore(); mListView.setRefreshTime("刚刚"); } @Override public void onRefresh() { mHandler.postDelayed(new Runnable() { @Override public void run() { start = ++refreshCnt; items.clear(); geneItems(); // mAdapter.notifyDataSetChanged(); adapter=new ItemAdapter(XListViewActivity.this); adapter.setData(items); mListView.setAdapter(adapter); onLoad(); } }, 2000); } @Override public void onLoadMore() { mHandler.postDelayed(new Runnable() { @Override public void run() { geneItems(); adapter.notifyDataSetChanged(); onLoad(); } }, 2000); } @Override public void removeItem(int position) { // TODO Auto-generated method stub mListView.isSlide = false; mListView.itemView.findViewById(R.id.tv_coating).setVisibility(View.VISIBLE); items.remove(position); adapter.notifyDataSetChanged(); } @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { // TODO Auto-generated method stub Intent intent = new Intent(getApplicationContext(), ItemActivity.class); intent.putExtra("item", items.get(position)); startActivity(intent); overridePendingTransition(R.anim.slide_in_from_right, R.anim.remain_original_location); } } 自定义LIstView * * @file XListView.java * @package me.maxwin.view * @create Mar 18, 2012 6:28:41 PM * @author Maxwin * @description An ListView support (a) Pull down to refresh, (b) Pull up to load more. * Implement IXListViewListener, and see stopRefresh() / stopLoadMore(). */ package me.maxwin.view; import me.maxwin.R; import android.content.Context; import android.util.AttributeSet; import android.util.Log; import android.view.MotionEvent; import android.view.VelocityTracker; import android.view.View; import android.view.ViewConfiguration; import android.view.ViewTreeObserver.OnGlobalLayoutListener; import android.view.animation.Animation; import android.view.animation.Animation.AnimationListener; import android.view.animation.DecelerateInterpolator; import android.view.animation.ScaleAnimation; import android.widget.AbsListView; import android.widget.AbsListView.OnScrollListener; import android.widget.AdapterView; import android.widget.ListAdapter; import android.widget.ListView; import android.widget.RelativeLayout; import android.widget.Scroller; import android.widget.TextView; public class XListView extends ListView implements OnScrollListener { private float mLastY = -1; // save event y private Scroller mScroller; // used for scroll back private OnScrollListener mScrollListener; // user's scroll listener // the interface to trigger refresh and load more. private IXListViewListener mListViewListener; // -- header view private XListViewHeader mHeaderView; // header view content, use it to calculate the Header's height. And hide it // when disable pull refresh. private RelativeLayout mHeaderViewContent; private TextView mHeaderTimeView; private int mHeaderViewHeight; // header view's height private boolean mEnablePullRefresh = true; private boolean mPullRefreshing = false; // is refreashing. // -- footer view private XListViewFooter mFooterView; private boolean mEnablePullLoad; private boolean mPullLoading; private boolean mIsFooterReady = false; // total list items, used to detect is at the bottom of listview. private int mTotalItemCount; // for mScroller, scroll back from header or footer. private int mScrollBack; private final static int SCROLLBACK_HEADER = 0; private final static int SCROLLBACK_FOOTER = 1; private final static int SCROLL_DURATION = 400; // scroll back duration private final static int PULL_LOAD_MORE_DELTA = 50; // when pull up >= 50px // at bottom, trigger // load more. private final static float OFFSET_RADIO = 1.8f; // support iOS like pull // feature. private int slidePosition, preSlidePosition; private int downY; private int downX; public static View itemView, preItemView; // private Scroller scroller; private static final int SNAP_VELOCITY = 600; private VelocityTracker velocityTracker; public static boolean isSlide = false; private boolean isResponse = true; public static boolean isObstruct = true; private int mTouchSlop; private RemoveListener mRemoveListener; private static Animation scaleHideAnimation; private static Animation scaleShowAnimation; /** * @param context */ public XListView(Context context) { super(context); initWithContext(context); mTouchSlop = ViewConfiguration.get(getContext()).getScaledTouchSlop(); } public XListView(Context context, AttributeSet attrs) { super(context, attrs); initWithContext(context); mTouchSlop = ViewConfiguration.get(getContext()).getScaledTouchSlop(); } public XListView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); // mScroller = new Scroller(context, new DecelerateInterpolator()); initWithContext(context); mTouchSlop = ViewConfiguration.get(getContext()).getScaledTouchSlop(); } private void initWithContext(Context context) { mScroller = new Scroller(context, new DecelerateInterpolator()); // XListView need the scroll event, and it will dispatch the event to // user's listener (as a proxy). super.setOnScrollListener(this); // init header view mHeaderView = new XListViewHeader(context); mHeaderViewContent = (RelativeLayout) mHeaderView .findViewById(R.id.xlistview_header_content); mHeaderTimeView = (TextView) mHeaderView .findViewById(R.id.xlistview_header_time); addHeaderView(mHeaderView); // init footer view mFooterView = new XListViewFooter(context); // init header height mHeaderView.getViewTreeObserver().addOnGlobalLayoutListener( new OnGlobalLayoutListener() { @Override public void onGlobalLayout() { mHeaderViewHeight = mHeaderViewContent.getHeight(); getViewTreeObserver() .removeGlobalOnLayoutListener(this); } }); } @Override public void setAdapter(ListAdapter adapter) { // make sure XListViewFooter is the last footer view, and only add once. if (mIsFooterReady == false) { mIsFooterReady = true; addFooterView(mFooterView); } super.setAdapter(adapter); } /** * enable or disable pull down refresh feature. * * @param enable */ public void setPullRefreshEnable(boolean enable) { mEnablePullRefresh = enable; if (!mEnablePullRefresh) { // disable, hide the content mHeaderViewContent.setVisibility(View.INVISIBLE); } else { mHeaderViewContent.setVisibility(View.VISIBLE); } } /** * enable or disable pull up load more feature. * * @param enable */ public void setPullLoadEnable(boolean enable) { mEnablePullLoad = enable; if (!mEnablePullLoad) { mFooterView.hide(); mFooterView.setOnClickListener(null); } else { mPullLoading = false; mFooterView.show(); mFooterView.setState(XListViewFooter.STATE_NORMAL); // both "pull up" and "click" will invoke load more. mFooterView.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { startLoadMore(); } }); } } /** * stop refresh, reset header view. */ public void stopRefresh() { if (mPullRefreshing == true) { mPullRefreshing = false; resetHeaderHeight(); } } /** * stop load more, reset footer view. */ public void stopLoadMore() { if (mPullLoading == true) { mPullLoading = false; mFooterView.setState(XListViewFooter.STATE_NORMAL); } } /** * set last refresh time * * @param time */ public void setRefreshTime(String time) { mHeaderTimeView.setText(time); } private void invokeOnScrolling() { if (mScrollListener instanceof OnXScrollListener) { OnXScrollListener l = (OnXScrollListener) mScrollListener; l.onXScrolling(this); } } private void updateHeaderHeight(float delta) { mHeaderView.setVisiableHeight((int) delta + mHeaderView.getVisiableHeight()); if (mEnablePullRefresh && !mPullRefreshing) { // 未处于刷新状态，更新箭头 if (mHeaderView.getVisiableHeight() > mHeaderViewHeight) { mHeaderView.setState(XListViewHeader.STATE_READY); } else { mHeaderView.setState(XListViewHeader.STATE_NORMAL); } } setSelection(0); // scroll to top each time } /** * reset header view's height. */ private void resetHeaderHeight() { int height = mHeaderView.getVisiableHeight(); if (height == 0) // not visible. return; // refreshing and header isn't shown fully. do nothing. if (mPullRefreshing && height <= mHeaderViewHeight) { return; } int finalHeight = 0; // default: scroll back to dismiss header. // is refreshing, just scroll back to show all the header. if (mPullRefreshing && height > mHeaderViewHeight) { finalHeight = mHeaderViewHeight; } mScrollBack = SCROLLBACK_HEADER; mScroller.startScroll(0, height, 0, finalHeight - height, SCROLL_DURATION); // trigger computeScroll invalidate(); } private void updateFooterHeight(float delta) { int height = mFooterView.getBottomMargin() + (int) delta; if (mEnablePullLoad && !mPullLoading) { if (height > PULL_LOAD_MORE_DELTA) { // height enough to invoke load // more. mFooterView.setState(XListViewFooter.STATE_READY); } else { mFooterView.setState(XListViewFooter.STATE_NORMAL); } } mFooterView.setBottomMargin(height); // setSelection(mTotalItemCount - 1); // scroll to bottom } private void resetFooterHeight() { int bottomMargin = mFooterView.getBottomMargin(); if (bottomMargin > 0) { mScrollBack = SCROLLBACK_FOOTER; mScroller.startScroll(0, bottomMargin, 0, -bottomMargin, SCROLL_DURATION); invalidate(); } } private void startLoadMore() { mPullLoading = true; mFooterView.setState(XListViewFooter.STATE_LOADING); if (mListViewListener != null) { mListViewListener.onLoadMore(); } } //RemoveListener public void setRemoveListener(RemoveListener removeListener) { this.mRemoveListener = removeListener; } public boolean dispatchTouchEvent(MotionEvent event) { switch (event.getAction()) { case MotionEvent.ACTION_DOWN: { Log.e("lg", "dispatchTouchEvent ACTION_DOWN isSlide1111 = " + isSlide); addVelocityTracker(event); downX = (int) event.getX(); downY = (int) event.getY(); slidePosition = pointToPosition(downX, downY); if (slidePosition == AdapterView.INVALID_POSITION) { return super.dispatchTouchEvent(event); } if (preItemView != null && preItemView.findViewById(R.id.tv_coating).getVisibility() == View.GONE) { itemView = preItemView; slidePosition = preSlidePosition; } else { itemView = getChildAt(slidePosition - getFirstVisiblePosition()); preItemView = itemView; preSlidePosition = slidePosition; } break; } case MotionEvent.ACTION_MOVE: { if (Math.abs(getScrollVelocity()) > SNAP_VELOCITY || (Math.abs(event.getX() - downX) > mTouchSlop && Math.abs(event.getY() - downY) < mTouchSlop)) { isSlide = true; } break; } case MotionEvent.ACTION_UP: recycleVelocityTracker(); isObstruct = true; break; } return super.dispatchTouchEvent(event); } public boolean onInterceptTouchEvent(MotionEvent ev) { switch (ev.getAction()) { case MotionEvent.ACTION_MOVE: if (itemView.findViewById(R.id.tv_coating).getVisibility() == View.VISIBLE) { isSlide = false; } else { isSlide = true; } break; default: break; } return super.onInterceptTouchEvent(ev); } //dispatchTouchEvent ACTION_DOWN isSlide // @Override dispatchTouchEvent public boolean onTouchEvent(MotionEvent ev) { if (isSlide && slidePosition != AdapterView.INVALID_POSITION) { addVelocityTracker(ev); final int action = ev.getAction(); switch (action) { case MotionEvent.ACTION_MOVE: if (isObstruct) { if (itemView.findViewById(R.id.tv_coating).getVisibility() == View.VISIBLE && isResponse == true) { scaleHideAnimation = new ScaleAnimation(1.0f, 0.0f, 1.0f, 1.0f); scaleHideAnimation.setDuration(250); scaleHideAnimation.setAnimationListener(new AnimationListener() { public void onAnimationStart(Animation animation) { isResponse = false; isObstruct = false; } public void onAnimationRepeat(Animation animation) { } public void onAnimationEnd(Animation animation) { isResponse = true; itemView.findViewById(R.id.tv_coating).setVisibility(View.GONE); itemView.findViewById(R.id.tv_functions).setClickable(true); itemView.findViewById(R.id.tv_functions).setOnClickListener(new OnClickListener() { public void onClick(View v) { mRemoveListener.removeItem(slidePosition); } }); } }); itemView.findViewById(R.id.tv_coating).startAnimation(scaleHideAnimation); } else if (itemView.findViewById(R.id.tv_coating).getVisibility() == View.GONE && isResponse == true) { scaleShowAnimation = new ScaleAnimation(0.0f, 1.0f, 1.0f, 1.0f); scaleShowAnimation.setDuration(250); scaleShowAnimation.setAnimationListener(new AnimationListener() { public void onAnimationStart(Animation animation) { isResponse = false; isObstruct = false; } public void onAnimationRepeat(Animation animation) { } public void onAnimationEnd(Animation animation) { isSlide = false; isResponse = true; itemView.findViewById(R.id.tv_coating).setVisibility(View.VISIBLE); } }); itemView.findViewById(R.id.tv_coating).startAnimation(scaleShowAnimation); } } break; case MotionEvent.ACTION_UP: isObstruct = true; recycleVelocityTracker(); isSlide = true; break; } return true; } if (mLastY == -1) { mLastY = ev.getRawY(); } switch (ev.getAction()) { case MotionEvent.ACTION_DOWN: mLastY = ev.getRawY(); break; case MotionEvent.ACTION_MOVE: final float deltaY = ev.getRawY() - mLastY; mLastY = ev.getRawY(); if (getFirstVisiblePosition() == 0 && (mHeaderView.getVisiableHeight() > 0 || deltaY > 0)) { // the first item is showing, header has shown or pull down. updateHeaderHeight(deltaY / OFFSET_RADIO); invokeOnScrolling(); } else if (getLastVisiblePosition() == mTotalItemCount - 1 && (mFooterView.getBottomMargin() > 0 || deltaY < 0)) { // last item, already pulled up or want to pull up. updateFooterHeight(-deltaY / OFFSET_RADIO); } break; default: mLastY = -1; // reset if (getFirstVisiblePosition() == 0) { // invoke refresh if (mEnablePullRefresh && mHeaderView.getVisiableHeight() > mHeaderViewHeight) { mPullRefreshing = true; mHeaderView.setState(XListViewHeader.STATE_REFRESHING); if (mListViewListener != null) { mListViewListener.onRefresh(); } } resetHeaderHeight(); } else if (getLastVisiblePosition() == mTotalItemCount - 1) { // invoke load more. if (mEnablePullLoad && mFooterView.getBottomMargin() > PULL_LOAD_MORE_DELTA && !mPullLoading) { startLoadMore(); } resetFooterHeight(); } break; } return super.onTouchEvent(ev); // return super.onTouchEvent(ev); } @Override public void computeScroll() { if (mScroller.computeScrollOffset()) { if (mScrollBack == SCROLLBACK_HEADER) { mHeaderView.setVisiableHeight(mScroller.getCurrY()); } else { mFooterView.setBottomMargin(mScroller.getCurrY()); } postInvalidate(); invokeOnScrolling(); if (mScroller.isFinished()) { if (mRemoveListener == null) { throw new NullPointerException("RemoveListener is null, we should called setRemoveListener()"); } itemView.scrollTo(0, 0); } } super.computeScroll(); } //addVelocityTracker private void addVelocityTracker(MotionEvent event) { if (velocityTracker == null) { velocityTracker = VelocityTracker.obtain(); } velocityTracker.addMovement(event); } private void recycleVelocityTracker() { if (velocityTracker != null) { velocityTracker.recycle(); velocityTracker = null; } } private int getScrollVelocity() { velocityTracker.computeCurrentVelocity(1000); int velocity = (int) velocityTracker.getXVelocity(); return velocity; } public interface RemoveListener { public void removeItem(int position); } @Override public void setOnScrollListener(OnScrollListener l) { mScrollListener = l; } @Override public void onScrollStateChanged(AbsListView view, int scrollState) { if (mScrollListener != null) { mScrollListener.onScrollStateChanged(view, scrollState); } } @Override public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) { // send to user's listener mTotalItemCount = totalItemCount; if (mScrollListener != null) { mScrollListener.onScroll(view, firstVisibleItem, visibleItemCount, totalItemCount); } } public void setXListViewListener(IXListViewListener l) { mListViewListener = l; } /** * you can listen ListView.OnScrollListener or this one. it will invoke * onXScrolling when header/footer scroll back. */ public interface OnXScrollListener extends OnScrollListener { public void onXScrolling(View view); } /** * implements this interface to get refresh/load more event. */ public interface IXListViewListener { public void onRefresh(); public void onLoadMore(); } }