XListView实现上拉加载下拉刷新
Posted loaderman
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package com.loaderman.androiddemo; import android.content.Context; import android.util.AttributeSet; import android.view.MotionEvent; import android.view.View; import android.view.ViewTreeObserver.OnGlobalLayoutListener; import android.view.animation.DecelerateInterpolator; import android.widget.AbsListView; import android.widget.AbsListView.OnScrollListener; 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. /** * @param context */ public XListView(Context context) { super(context); initWithContext(context); } public XListView(Context context, AttributeSet attrs) { super(context, attrs); initWithContext(context); } public XListView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); initWithContext(context); } 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() { @SuppressWarnings("deprecation") @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 loadmore. 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(); } } @Override public boolean onTouchEvent(MotionEvent ev) { 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) && getCount()>10) { // 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) { startLoadMore(); } resetFooterHeight(); } break; } 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(); } super.computeScroll(); } @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(); } public void setFooterBackgroundRes(int resId) { if (mFooterView != null) { mFooterView.setBackgroundResource(resId); } } public void setFooterBackgroundColor(int resId) { if (mFooterView != null) { mFooterView.setBackgroundColor(resId); mFooterView.invalidate(); } } /** * 是否处于加载更多的状态 * @return */ public boolean isLoading(){ return mPullLoading; } // public void showRefresh() { // mPullRefreshing = true; // mHeaderView.setVisiableHeight(mHeaderViewHeight); // mHeaderView.setState(XListViewHeader.STATE_REFRESHING); // mListViewListener.onRefresh(); // } }
package com.loaderman.androiddemo; import android.content.Context; import android.util.AttributeSet; import android.view.LayoutInflater; import android.view.View; import android.view.animation.Animation; import android.view.animation.AnimationUtils; import android.view.animation.LinearInterpolator; import android.widget.ImageView; import android.widget.LinearLayout; import android.widget.TextView; public class XListViewFooter extends LinearLayout { public final static int STATE_NORMAL = 0; public final static int STATE_READY = 1; public final static int STATE_LOADING = 2; private Context mContext; private View mContentView; private TextView mHintView; private ImageView mLoadIcon; private Animation animation; public XListViewFooter(Context context) { super(context); initView(context); } public XListViewFooter(Context context, AttributeSet attrs) { super(context, attrs); initView(context); } public void setState(int state) { switch (state) { case STATE_READY: mLoadIcon.clearAnimation(); mLoadIcon.setImageResource(R.drawable.icon_loading_not_selected); mHintView.setText(R.string.xlistview_footer_hint_ready); break; case STATE_LOADING: mHintView.setText(R.string.xlistview_header_hint_loading); mLoadIcon.setImageResource(R.drawable.icon_loading_selected); mLoadIcon.startAnimation(animation); break; default: mLoadIcon.clearAnimation(); mHintView.setText(R.string.xlistview_footer_hint_normal); mLoadIcon.setImageResource(R.drawable.icon_loading_not_selected); break; } } public void setBottomMargin(int height) { if (height < 0) return ; LayoutParams lp = (LayoutParams)mContentView.getLayoutParams(); lp.bottomMargin = height; mContentView.setLayoutParams(lp); } public int getBottomMargin() { LayoutParams lp = (LayoutParams)mContentView.getLayoutParams(); return lp.bottomMargin; } /** * normal status */ public void normal() { mHintView.setVisibility(View.VISIBLE); } /** * loading status */ public void loading() { mHintView.setVisibility(View.GONE); mHintView.setText(R.string.xlistview_header_hint_loading); mLoadIcon.setImageResource(R.drawable.icon_loading_selected); } /** * hide footer when disable pull load more */ public void hide() { LayoutParams lp = (LayoutParams)mContentView.getLayoutParams(); lp.height = 0; mContentView.setLayoutParams(lp); } /** * show footer */ public void show() { LayoutParams lp = (LayoutParams)mContentView.getLayoutParams(); lp.height = LayoutParams.WRAP_CONTENT; mContentView.setLayoutParams(lp); } private void initView(Context context) { mContext = context; LinearLayout moreView = (LinearLayout)LayoutInflater.from(mContext).inflate(R.layout.xlistview_footer, null); addView(moreView); moreView.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT)); mContentView = moreView.findViewById(R.id.xlistview_footer_content); mHintView = (TextView)moreView.findViewById(R.id.xlistview_footer_hint_textview); mLoadIcon = (ImageView) moreView.findViewById(R.id.iv_load); animation = AnimationUtils.loadAnimation(mContext, R.anim.loadmore); LinearInterpolator lin = new LinearInterpolator(); animation.setInterpolator(lin); } }
package com.loaderman.androiddemo; import android.content.Context; import android.util.AttributeSet; import android.view.Gravity; import android.view.LayoutInflater; import android.view.animation.Animation; import android.view.animation.AnimationUtils; import android.view.animation.LinearInterpolator; import android.view.animation.RotateAnimation; import android.widget.ImageView; import android.widget.LinearLayout; import android.widget.TextView; public class XListViewHeader extends LinearLayout { private LinearLayout mContainer; private ImageView mArrowImageView; private TextView mHintTextView; private int mState = STATE_NORMAL; private Animation mRotateUpAnim; private Animation mRotateDownAnim; private final int ROTATE_ANIM_DURATION = 180; public final static int STATE_NORMAL = 0; public final static int STATE_READY = 1; public final static int STATE_REFRESHING = 2; private Animation mPBAnimation; public XListViewHeader(Context context) { super(context); initView(context); } /** * @param context * @param attrs */ public XListViewHeader(Context context, AttributeSet attrs) { super(context, attrs); initView(context); } private void initView(Context context) { // 初始情况，设置下拉刷新view高度 LayoutParams lp = new LayoutParams( LayoutParams.MATCH_PARENT, 0); mContainer = (LinearLayout) LayoutInflater.from(context).inflate( R.layout.xlistview_header, null); addView(mContainer, lp); setGravity(Gravity.BOTTOM); mArrowImageView = (ImageView)findViewById(R.id.xlistview_header_arrow); mHintTextView = (TextView)findViewById(R.id.xlistview_header_hint_textview); mPBAnimation = AnimationUtils.loadAnimation(context, R.anim.loadmore); LinearInterpolator lin = new LinearInterpolator(); mPBAnimation.setInterpolator(lin); mRotateUpAnim = new RotateAnimation(0.0f, -180.0f, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f); if (isInEditMode()) { return; } mRotateUpAnim.setDuration(ROTATE_ANIM_DURATION); mRotateUpAnim.setFillAfter(true); mRotateDownAnim = new RotateAnimation(-180.0f, 0.0f, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f); mRotateDownAnim.setDuration(ROTATE_ANIM_DURATION); mRotateDownAnim.setFillAfter(true); } public void setState(int state) { if (state == mState) return ; mArrowImageView.clearAnimation(); if (state == STATE_REFRESHING) { // 显示进度 mArrowImageView.setImageResource(R.drawable.icon_loading_selected); mArrowImageView.startAnimation(mPBAnimation); } else { // 显示箭头图片 mArrowImageView.setImageResource(R.drawable.xlistview_arrow); } switch(state){ case STATE_NORMAL: if (mState == STATE_READY) { mArrowImageView.startAnimation(mRotateDownAnim); } if (mState == STATE_REFRESHING) { mArrowImageView.clearAnimation(); } mHintTextView.setText(R.string.xlistview_header_hint_normal); break; case STATE_READY: if (mState != STATE_READY) { mArrowImageView.clearAnimation(); mArrowImageView.startAnimation(mRotateUpAnim); mHintTextView.setText(R.string.xlistview_header_hint_ready); } break; case STATE_REFRESHING: mHintTextView.setText(R.string.xlistview_header_hint_loading); break; } mState = state; } public void setVisiableHeight(int height) { if (height < 0) height = 0; LayoutParams lp = (LayoutParams) mContainer .getLayoutParams(); lp.height = height; mContainer.setLayoutParams(lp); } public int getVisiableHeight() { return mContainer.getHeight(); } }
package com.loaderman.androiddemo; import android.app.Activity; import android.os.Bundle; import android.os.Handler; import android.os.Message; import java.util.ArrayList; import java.util.List; public class MainActivity extends Activity implements XListView.IXListViewListener { protected static final int REFRESHING = 0; protected static final int LOADMOREING = 1; private XListView lv; private List<String> data; private TextAdapter adapter; private Handler handler = new Handler() { @Override public void handleMessage(Message msg) { switch (msg.what) { case REFRESHING: for (int i = 0; i < 5; i++) { data.add(0, "pre" + String.valueOf(i)); } lv.stopRefresh(); break; case LOADMOREING: for (int i = 0; i < 5; i++) { data.add(String.valueOf(data.size() + i)); } lv.stopLoadMore(); break; } if (adapter!=null) { adapter.setData(data); adapter.notifyDataSetChanged(); } } }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initData(); initView(); adapter = new TextAdapter(MainActivity.this, data); lv.setAdapter(adapter); } private void initView() { lv = (XListView) findViewById(R.id.lv); lv.setPullRefreshEnable(true);// 开启下拉刷新 lv.setPullLoadEnable(true);// 开启上滑加载更多 lv.setXListViewListener(MainActivity.this);// 设置监听器 } private void initData() { data = new ArrayList<String>(); for (int i = 0; i < 10; i++) { data.add(String.valueOf(i)); } } @Override public void onRefresh() { Message msg = Message.obtain(); msg.what = REFRESHING; handler.sendMessageDelayed(msg, 2000); } @Override public void onLoadMore() { Message msg = Message.obtain(); msg.what = LOADMOREING; handler.sendMessageDelayed(msg, 2000); } }
package com.loaderman.androiddemo; import android.content.Context; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.ImageView; import android.widget.LinearLayout; import android.widget.TextView; import java.util.List; public class TextAdapter extends BaseAdapter { private Context context; private List<String> data; public TextAdapter(Context context, List<String> data){ this.context = context; this.data = data; } public void setData(List<String> data) { this.data = data; } @Override public int getCount() { return data.size(); } @Override public Object getItem(int position) { return data.get(position); } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { ImageHolder holder = null; if(convertView != null && convertView instanceof LinearLayout){ holder = (ImageHolder) convertView.getTag(); }else{ convertView = View.inflate(context, R.layout.listview_item, null); holder = new ImageHolder(); holder.icon = (ImageView) convertView.findViewById(R.id.iv_listview_item); holder.tvName = (TextView) convertView.findViewById(R.id.tv_listview_item_name); convertView.setTag(holder); } holder.tvName.setText(data.get(position)); holder.icon.setTag(position); return convertView; } class ImageHolder{ public ImageView icon; public TextView tvName; } }
xlistview_footer.xml
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="wrap_content" > <RelativeLayout android:id="@+id/xlistview_footer_content" android:layout_width="fill_parent" android:layout_height="wrap_content" android:padding="10dp" > <TextView android:id="@+id/xlistview_footer_hint_textview" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true" android:text="@string/xlistview_footer_hint_normal" /> <ImageView android:id="@+id/iv_load" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignBottom="@id/xlistview_footer_hint_textview" android:layout_alignTop="@id/xlistview_footer_hint_textview" android:layout_centerInParent="true" android:layout_marginRight="5dp" android:layout_toLeftOf="@id/xlistview_footer_hint_textview" android:scaleType="fitEnd" android:src="@drawable/icon_loading_not_selected" /> </RelativeLayout> </LinearLayout>
xlistview_header.xml
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="wrap_content" android:background="#f2f2f2" android:gravity="bottom" > <RelativeLayout android:id="@+id/xlistview_header_content" android:layout_width="fill_parent" android:layout_height="60dp" > <LinearLayout android:id="@+id/xlistview_header_text" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true" android:gravity="center" android:orientation="vertical" > <TextView android:id="@+id/xlistview_header_hint_textview" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/xlistview_header_hint_normal" /> <LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="3dp" > <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/xlistview_header_last_time" android:textSize="12sp" /> <TextView android:id="@+id/xlistview_header_time" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textSize="12sp" /> </LinearLayout> </LinearLayout> <ImageView android:id="@+id/xlistview_header_arrow" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignLeft="@id/xlistview_header_text" android:layout_centerVertical="true" android:layout_marginLeft="-35dp" android:src="@drawable/xlistview_arrow" /> </RelativeLayout> </LinearLayout>
<resources> <string name="app_name">androiddemo</string> <string name="xlistview_header_hint_normal">下拉刷新</string> <string name="xlistview_header_last_time">上次更新时间:</string> <string name="xlistview_footer_hint_ready">查看更多</string> <string name="xlistview_footer_hint_normal">加载更多</string> <string name="xlistview_header_hint_ready">松开刷新数据</string> <string name="xlistview_header_hint_loading">正在加载···</string> </resources>
anim/loadmore.xml
<?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android" > <rotate android:duration="500" android:fromDegrees="0" android:pivotX="50%" android:pivotY="50%" android:repeatCount="-1" android:toDegrees="359" /> </set>
效果:
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