自定義ListView重新整理，上拉載入
阿新 • • 發佈：2018-12-04
XListView
public class XListView extends ListView implements OnScrollListener { private float mLastY = -1; // save event y private Scroller mScroller; // 用於回滾 private OnScrollListener mScrollListener; // 回滾監聽 // 觸發重新整理和載入更多介面. private IXListViewListener mListViewListener; // -- 頭部的Viewprivate XListViewHeader mHeaderView; // 檢視頭部的內容，用它計算頭部高度，和隱藏它 // 當禁用的時候重新整理 private RelativeLayout mHeaderViewContent; private TextView mHeaderTimeView; private int mHeaderViewHeight; // 頭部View的高 private boolean mEnablePullRefresh = true; private boolean mPullRefreshing = false; // 是否重新整理.// -- 底部的View private XListViewFooter mFooterView; private boolean mEnablePullLoad; private boolean mPullLoading; private boolean mIsFooterReady = false; // 總列表項，用於檢測列表檢視的底部 private int mTotalItemCount; // for mScroller, 滾動頁首或者頁尾 private int mScrollBack; private final static intSCROLLBACK_HEADER = 0;// 頂部 private final static int SCROLLBACK_FOOTER = 1;// 下部 private final static int SCROLL_DURATION = 400; // 滾動回時間 private final static int PULL_LOAD_MORE_DELTA = 50; // 當大於50PX的時候，載入更多 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); // 初始化頭部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);// 把頭部這個檢視新增進去 // 初始化底部的View mFooterView = new XListViewFooter(context); // 初始化頭部高度 mHeaderView.getViewTreeObserver().addOnGlobalLayoutListener( new OnGlobalLayoutListener() { @Override public void onGlobalLayout() { mHeaderViewHeight = mHeaderViewContent.getHeight(); getViewTreeObserver() .removeGlobalOnLayoutListener(this); } }); } /** * 啟用或禁用載入更多的功能. * * @param enable */ public void setPullLoadEnable(boolean enable) { mEnablePullLoad = enable; if (!mEnablePullLoad) { mFooterView.hide();// 隱藏 mFooterView.setOnClickListener(null); } else { mPullLoading = false; mFooterView.hide();// 顯示 mFooterView.setState(XListViewFooter.STATE_NORMAL); // both "上拉" 和 "點選" 將呼叫載入更多. mFooterView.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { startLoadMore(); } }); } } /** * 停止重新整理, 重置頭檢視. */ 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); } } /** * 設定最後一次重新整理時間 * * @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) { // 未處於重新整理狀態，更新箭頭 if (mHeaderView.getVisiableHeight() > mHeaderViewHeight) { mHeaderView.setState(XListViewHeader.STATE_READY); } else { mHeaderView.setState(XListViewHeader.STATE_NORMAL); } } setSelection(0); // scroll to top each time } /** * 重置頭檢視的高度 */ private void resetHeaderHeight() { int height = mHeaderView.getVisiableHeight(); if (height == 0) // 不顯示. return; // 不顯示重新整理和標題的時候，什麼都不顯示 if (mPullRefreshing && height <= mHeaderViewHeight) { return; } int finalHeight = 0; // 預設：滾動回頭. // 當滾動回顯示所有頭標題時候，重新整理 if (mPullRefreshing && height > mHeaderViewHeight) { finalHeight = mHeaderViewHeight; } mScrollBack = SCROLLBACK_HEADER; mScroller.startScroll(0, height, 0, finalHeight - height, SCROLL_DURATION); // 觸發重新整理 invalidate(); } // 改變底部檢視高度 private void updateFooterHeight(float delta) { int height = mFooterView.getBottomMargin() + (int) delta; if (mEnablePullLoad && !mPullLoading) { if (height > PULL_LOAD_MORE_DELTA) { // 高度足以呼叫載入更多 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(); } } // 開始載入更多 private void startLoadMore() { mPullLoading = true; mFooterView.setState(XListViewFooter.STATE_LOADING); if (mListViewListener != null) { mListViewListener.onLoadMore(); } } // 觸發事件 @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("資料監測：" + getFirstVisiblePosition() + "---->" // + getLastVisiblePosition()); if (getFirstVisiblePosition() == 0 && (mHeaderView.getVisiableHeight() > 0 || deltaY > 0)) { // 第一項顯示,標題顯示或拉下來. updateHeaderHeight(deltaY / OFFSET_RADIO); invokeOnScrolling(); } else if (getLastVisiblePosition() == mTotalItemCount - 1 && (mFooterView.getBottomMargin() > 0 || deltaY < 0)) { // 最後一頁，已停止或者想拉起 updateFooterHeight(-deltaY / OFFSET_RADIO); } break; default: mLastY = -1; // 重置 if (getFirstVisiblePosition() == 0) { // 呼叫重新整理,如果頭部檢視高度大於設定高度。 if (mEnablePullRefresh && mHeaderView.getVisiableHeight() > mHeaderViewHeight) { mPullRefreshing = true;// 那麼重新整理 mHeaderView.setState(XListViewHeader.STATE_REFRESHING); if (mListViewListener != null) { mListViewListener.onRefresh(); } } resetHeaderHeight();// 重新整理完畢，重置頭部高度，也就是返回上不 } if (getLastVisiblePosition() == mTotalItemCount - 1) { // 呼叫載入更多. if (mEnablePullLoad && mFooterView.getBottomMargin() > PULL_LOAD_MORE_DELTA) { startLoadMore();// 如果底部檢視高度大於可以載入高度，那麼就開始載入 } resetFooterHeight();// 重置載入更多檢視高度 } 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) { // 傳送到使用者的監聽器 mTotalItemCount = totalItemCount; if (mScrollListener != null) { mScrollListener.onScroll(view, firstVisibleItem, visibleItemCount, totalItemCount); } } public void setXListViewListener(IXListViewListener l) { mListViewListener = l; } /** * 你可以監聽到列表檢視，OnScrollListener 或者這個. 他將會被呼叫 , 當頭部或底部觸發的時候 */ public interface OnXScrollListener extends OnScrollListener { public void onXScrolling(View view); } /** * 實現這個介面來重新整理/負載更多的事件 */ public interface IXListViewListener { public void onRefresh(); public void onLoadMore(); } }
頭部重新整理
public class XListViewHeader extends LinearLayout { private LinearLayout mContainer; private ImageView mArrowImageView; private ProgressBar mProgressBar; private TextView mHintTextView; private int mState = STATE_NORMAL;// 初始狀態 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) { // 初始情況，設定下拉重新整理view高度為0 LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams( LayoutParams.FILL_PARENT, 0); // 時間TextView mContainer = (LinearLayout) LayoutInflater.from(context).inflate( R.layout.xlistview_header, null); addView(mContainer, lp); setGravity(Gravity.BOTTOM); // 找到頭部頁面裡的控制元件 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); } // 設定狀態 public void setState(int state) { if (state == mState) return; if (state == STATE_REFRESHING) { // 顯示進度 mArrowImageView.clearAnimation(); mArrowImageView.setVisibility(View.INVISIBLE);// 不顯示圖片 mProgressBar.setVisibility(View.VISIBLE);// 顯示進度條 } else { // 顯示箭頭圖片 mArrowImageView.setVisibility(View.VISIBLE); mProgressBar.setVisibility(View.INVISIBLE); } switch (state) { case STATE_NORMAL: if (mState == STATE_READY) {// 當狀態時準備的時候，顯示動畫 mArrowImageView.startAnimation(mRotateDownAnim); } if (mState == STATE_REFRESHING) {// 當狀態顯示進度條的時候，清除動畫 mArrowImageView.clearAnimation(); } mHintTextView.setText("下拉重新整理");// 文字提示：下拉重新整理 break; case STATE_READY: if (mState != STATE_READY) { mArrowImageView.clearAnimation(); mArrowImageView.startAnimation(mRotateUpAnim); mHintTextView.setText("鬆開重新整理資料");// 鬆開重新整理資料 } break; case STATE_REFRESHING: mHintTextView.setText("載入中..."); 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(); } }
佈局
<?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: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="下拉重新整理" /> <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="最後更新時間:" 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:indeterminateDrawable="@drawable/listview_loading_github" android:indeterminateDuration="1800" android:visibility="invisible" /> </RelativeLayout> </LinearLayout>
上拉載入更多
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 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);// 開始底部控制元件都隱藏 mProgressBar.setVisibility(View.INVISIBLE); mHintView.setVisibility(View.INVISIBLE); if (state == STATE_READY) {// 如果是第一頁狀態，那麼“檢視更多”顯示 mHintView.setVisibility(View.VISIBLE); mHintView.setText("鬆開顯示更多");// 鬆開顯示更多 } else if (state == STATE_LOADING) {// 當載入的時候 mProgressBar.setVisibility(View.VISIBLE);// 載入進度條顯示 } else { mHintView.setVisibility(View.VISIBLE); mHintView.setText("檢視更多");// 檢視更多 } } 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); } /** * 當禁用拉載入更多隱藏底部檢視 */ public void hide() { LinearLayout.LayoutParams lp = (LinearLayout.LayoutParams) mContentView .getLayoutParams(); lp.height = 0; mContentView.setLayoutParams(lp); }