Android学习之listview的下拉刷新、上拉载入

<?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" > <ProgressBar
android:id="@+id/xlistview_footer_progressbar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:visibility="invisible" /> <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" />
</RelativeLayout> </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 View mProgressBar;
private TextView mHintView; public XListViewFooter(Context context) {
super(context);
initView(context);
} public XListViewFooter(Context context, AttributeSet attrs) {
super(context, attrs);
initView(context);
} public void setState(int state) {
mHintView.setVisibility(View.INVISIBLE);
mProgressBar.setVisibility(View.INVISIBLE);
mHintView.setVisibility(View.INVISIBLE);
if (state == STATE_READY) {
mHintView.setVisibility(View.VISIBLE);
mHintView.setText(R.string.xlistview_footer_hint_ready);
} else if (state == STATE_LOADING) {
mProgressBar.setVisibility(View.VISIBLE);
} else {
mHintView.setVisibility(View.VISIBLE);
mHintView.setText(R.string.xlistview_footer_hint_normal);
}
} public void setBottomMargin(int height) {
if (height < 0) return ;
LinearLayout.LayoutParams lp = (LinearLayout.LayoutParams)mContentView.getLayoutParams();
lp.bottomMargin = height;
mContentView.setLayoutParams(lp);
} public int getBottomMargin() {
LinearLayout.LayoutParams lp = (LinearLayout.LayoutParams)mContentView.getLayoutParams();
return lp.bottomMargin;
} /**
* normal status
*/
public void normal() {
mHintView.setVisibility(View.VISIBLE);
mProgressBar.setVisibility(View.GONE);
} /**
* loading status
*/
public void loading() {
mHintView.setVisibility(View.GONE);
mProgressBar.setVisibility(View.VISIBLE);
} /**
* hide footer when disable pull load more
*/
public void hide() {
LinearLayout.LayoutParams lp = (LinearLayout.LayoutParams)mContentView.getLayoutParams();
lp.height = 0;
mContentView.setLayoutParams(lp);
} /**
* show footer
*/
public void show() {
LinearLayout.LayoutParams lp = (LinearLayout.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 LinearLayout.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT)); mContentView = moreView.findViewById(R.id.xlistview_footer_content);
mProgressBar = moreView.findViewById(R.id.xlistview_footer_progressbar);
mHintView = (TextView)moreView.findViewById(R.id.xlistview_footer_hint_textview);
}

<?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:gravity="bottom" > <RelativeLayout
android:id="@+id/xlistview_header_content"
android:layout_width="fill_parent"
android:layout_height="60dp" > <LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:gravity="center"
android:orientation="vertical" android:id="@+id/xlistview_header_text"> <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" /> <ProgressBar
android:id="@+id/xlistview_header_progressbar"
android:layout_width="30dp"
android:layout_height="30dp"
android:layout_alignLeft="@id/xlistview_header_text"
android:layout_centerVertical="true"
android:layout_marginLeft="-40dp"
android:visibility="invisible" />
</RelativeLayout> </LinearLayout>

private LinearLayout mContainer;
private ImageView mArrowImageView;
private ProgressBar mProgressBar;
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; 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) {
// 鍒濆鎯呭喌锛岃缃笅鎷夊埛鏂皏iew楂樺害涓?
LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(
LayoutParams.FILL_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);
mProgressBar = (ProgressBar)findViewById(R.id.xlistview_header_progressbar); mRotateUpAnim = new RotateAnimation(0.0f, -180.0f,
Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF,
0.5f);
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 ; if (state == STATE_REFRESHING) { // 鏄剧ず杩涘害
mArrowImageView.clearAnimation();
mArrowImageView.setVisibility(View.INVISIBLE);
mProgressBar.setVisibility(View.VISIBLE);
} else { // 鏄剧ず绠ご鍥剧墖
mArrowImageView.setVisibility(View.VISIBLE);
mProgressBar.setVisibility(View.INVISIBLE);
} 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;
default:
} mState = state;
} public void setVisiableHeight(int height) {
if (height < 0)
height = 0;
LinearLayout.LayoutParams lp = (LinearLayout.LayoutParams) mContainer
.getLayoutParams();
lp.height = height;
mContainer.setLayoutParams(lp);
} public int getVisiableHeight() {
return mContainer.getHeight();
}

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) { // 鏈浜庡埛鏂扮姸鎬侊紝鏇存柊绠ご
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();
}
} @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();
System.out.println(getFirstVisiblePosition() + "---->"
+ getLastVisiblePosition());
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();
}
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();
}
}

protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
handler=new Handler();
sqlhelper=new SQLiteHelper(MainActivity.this, "test", null, 1);
list=new ArrayList<PersonInfo>();
getData();
listview=(XListView)findViewById(R.id.listView1);
registerForContextMenu(listview);
listview.setPullLoadEnable(true);
// View moreview=getLayoutInflater().inflate(R.layout.moredata, null);
//listview.addFooterView(moreview);
adapter=new MyAdapter(this);
listview.setAdapter(adapter);
listview.setXListViewListener(this);
listview.setOnItemLongClickListener(new OnItemLongClickListener() {
@Override
public boolean onItemLongClick(AdapterView<?> arg0, View arg1,
int arg2, long arg3) {
// TODO Auto-generated method stub
PersonInfo person=list.get(arg2);
delname=person.getName();
return false;
}
}); /* btnpro=(Button)moreview.findViewById(R.id.bt_load);
pg=(ProgressBar)moreview.findViewById(R.id.pg);
btnpro.setOnClickListener(new View.OnClickListener() { @Override
public void onClick(View v) {
// TODO Auto-generated method stub
pg.setVisibility(View.VISIBLE);// 将进度条可见
btnpro.setVisibility(View.GONE);// 按钮不可见
Handler hanldre=new Handler();
hanldre.postDelayed(new Runnable(){ @Override
public void run() {
// TODO Auto-generated method stub adapter.count+=5; btnpro.setVisibility(View.VISIBLE);
pg.setVisibility(View.GONE);
if(adapter.count>list.size()) {
adapter. count=list.size();
btnpro.setVisibility(View.INVISIBLE);
}
adapter.notifyDataSetChanged();
}}, 2000);
}
});*/ }
private void getData()
{
Cursor cur=sqlhelper.getReadableDatabase().query("person", null, null, null, null, null, null);
if(cur.moveToFirst())
{
while(cur.moveToNext())
{
PersonInfo person=new PersonInfo();
person.name=cur.getString(cur.getColumnIndex("name"));
person.age=cur.getInt(cur.getColumnIndex("age"));
list.add(person);
}
}
}
private void onLoad() {
listview.stopRefresh();
listview.stopLoadMore();
SimpleDateFormat timeFormat = new SimpleDateFormat("HH:mm:ss");
String strTime = timeFormat.format(new java.util.Date());
listview.setRefreshTime(strTime);
}

@Override
public void onRefresh() {
// TODO Auto-generated method stub
handler.postDelayed(new Runnable(){ @Override
public void run() {
// TODO Auto-generated method stub
if(list!=null &&list.size()>0)
{
list.clear();
getData();
adapter.notifyDataSetChanged();
onLoad();
}
}}, 2000);
}
@Override
public void onLoadMore() {
// TODO Auto-generated method stub handler.postDelayed(new Runnable(){ @Override
public void run() {
// TODO Auto-generated method stub
adapter.count+=5; if(adapter.count>list.size()) {
adapter. count=list.size();
}
adapter.notifyDataSetChanged();
onLoad();
}}, 2000);
}