头部下拉/底部上拉 自动刷新、自定义ListView组件
2014-02-17 11:41
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AutoRefreshListView
public class AutoRefreshListView extends ListView implements OnScrollListener { private static final String TAG = "AutoRefreshListView"; private final static int RELEASE_To_REFRESH = 0; private final static int PULL_To_REFRESH = 1; private final static int REFRESHING = 2; private final static int DONE = 3; private final static int LOADING = 4; private final static int UP_To_REFRESH = 5;//当拖动到最底部时载向上拖动 自动刷新 boolean isboottom=false; int scrolledItemCount ;//已经滚动了多少项 int visibleItemCount;//当前可见项 int totalItemCount;//总共有多少项 // 实际的padding的距离与界面上偏移距离的比例 private final static int RATIO = 3; private LayoutInflater inflater; private LinearLayout headView; private TextView tipsTextview; private TextView lastUpdatedTextView; private ImageView arrowImageView; private ProgressBar progressBar; private ProgressBar footerProgressBar; LinearLayout footer; Button footerBtn;//footer private RotateAnimation animation; private RotateAnimation reverseAnimation; // 用于保证startY的值在一个完整的touch事件中只被记录一次 private boolean isRecored; private int headContentWidth; private int headContentHeight; private int startY;//下拉刷新起始记录 private int startYY;//上拉刷新起始记录 private int firstItemIndex; private int state; private boolean isBack; private OnRefreshListener refreshListener; private OnUpRefreshListener upRefreshListener; private boolean isRefreshable;//是否可以下拉刷新 private boolean isUpRefreshable;//拖动到最后 再向上拖动,是否可以上拉刷新 public AutoRefreshListView(Context context) { super(context); init(context); } public AutoRefreshListView(Context context, AttributeSet attrs) { super(context, attrs); init(context); } private void init(Context context) { setCacheColorHint(context.getResources().getColor(R.color.transparent)); inflater = LayoutInflater.from(context); footer=(LinearLayout) inflater.inflate(R.layout.footer, null); footerBtn = (Button) footer.findViewById(R.id.footerBtn); footerBtn.setText("向上拖动加载更多..."); footer.setBackgroundColor(Color.TRANSPARENT); footerProgressBar = (ProgressBar) footer.findViewById(R.id.footer_progressBar); headView = (LinearLayout) inflater.inflate(R.layout.head, null); arrowImageView = (ImageView) headView .findViewById(R.id.head_arrowImageView); arrowImageView.setMinimumWidth(70); arrowImageView.setMinimumHeight(50); progressBar = (ProgressBar) headView .findViewById(R.id.head_progressBar); tipsTextview = (TextView) headView.findViewById(R.id.head_tipsTextView); lastUpdatedTextView = (TextView) headView .findViewById(R.id.head_lastUpdatedTextView); measureView(headView); headContentHeight = headView.getMeasuredHeight(); headContentWidth = headView.getMeasuredWidth(); headView.setPadding(0, -1 * headContentHeight, 0, 0); headView.invalidate(); Log.v("size", "width:" + headContentWidth + " height:" + headContentHeight); addHeaderView(headView, null, false); // addFooterView(footer); setOnScrollListener(this); animation = new RotateAnimation(0, -180, RotateAnimation.RELATIVE_TO_SELF, 0.5f, RotateAnimation.RELATIVE_TO_SELF, 0.5f); animation.setInterpolator(new LinearInterpolator()); animation.setDuration(250); animation.setFillAfter(true); reverseAnimation = new RotateAnimation(-180, 0, RotateAnimation.RELATIVE_TO_SELF, 0.5f, RotateAnimation.RELATIVE_TO_SELF, 0.5f); reverseAnimation.setInterpolator(new LinearInterpolator()); reverseAnimation.setDuration(200); reverseAnimation.setFillAfter(true); state = DONE; isRefreshable = false; isUpRefreshable = false; } public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) { firstItemIndex = firstVisibleItem; if(isUpRefreshable){ if(visibleItemCount!=totalItemCount){ if (getFooterViewsCount()>0) { }else{ addFooterView(footer); } }else{ if (getFooterViewsCount()>0) { removeFooterView(footer); } } this.visibleItemCount = visibleItemCount; this.totalItemCount = totalItemCount; scrolledItemCount = firstVisibleItem+visibleItemCount; } // Log.d("T", "firstVisibleItem+visibleItemCount="+(firstVisibleItem+visibleItemCount)); // Log.d("T", "totalItemCount="+totalItemCount); // if(scrolledItemCount==totalItemCount && visibleItemCount<totalItemCount ){ // gets // Log.d("T", "开始刷新"); // } } public void onScrollStateChanged(AbsListView arg0, int arg1) { } public boolean onTouchEvent(MotionEvent event) { if(isUpRefreshable){ switch (event.getAction()) { case MotionEvent.ACTION_DOWN:{ startYY = (int) event.getY(); }break; case MotionEvent.ACTION_MOVE:{ int endY = (int) event.getY(); if (scrolledItemCount<totalItemCount) { startYY = 0; isboottom=false; }else{ if (!isboottom) { isboottom=true; startYY = (int) event.getY(); } } if(scrolledItemCount==totalItemCount && visibleItemCount<totalItemCount ){//到最后一个位置,且总共达项目大于一页 if((endY-startYY)<-75){//上拉 Log.d("T", "开始上拉刷新"); int paddingbottom=startY-endY; if (paddingbottom>10) { paddingbottom=10; } this.setPadding(0, 0, 0,paddingbottom); footerBtn.setText("松开后开始刷新..."); } } }break; case MotionEvent.ACTION_UP:{ int endY = (int) event.getY(); if(scrolledItemCount==totalItemCount && visibleItemCount<totalItemCount ){//到最后一个位置,且总共达项目大于一页 if((endY-startYY)<-75){//上拉 Log.d("T", "开始上拉刷新"); this.setPadding(0, 0, 0,0); footerBtn.setText("正在刷新,请稍后..."); footerProgressBar.setVisibility(View.VISIBLE); onUpRefresh(); }else{ footerProgressBar.setVisibility(View.GONE); footerBtn.setText("向上拖动加载更多..."); } } }break; default: break; } } if (isRefreshable) { switch (event.getAction()) { case MotionEvent.ACTION_DOWN: if (firstItemIndex == 0 && !isRecored) { isRecored = true; startY = (int) event.getY(); Log.v(TAG, "在down时候记录当前位置‘"); } break; case MotionEvent.ACTION_UP: if (state != REFRESHING && state != LOADING) { if (state == DONE) { // 什么都不做 } if (state == PULL_To_REFRESH) { state = DONE; changeHeaderViewByState(); Log.v(TAG, "由下拉刷新状态,到done状态"); } if (state == RELEASE_To_REFRESH) { state = REFRESHING; changeHeaderViewByState(); onRefresh(); Log.v(TAG, "由松开刷新状态,到done状态"); } } isRecored = false; isBack = false; break; case MotionEvent.ACTION_MOVE: int tempY = (int) event.getY(); if (!isRecored && firstItemIndex == 0) { Log.v(TAG, "在move时候记录下位置"); isRecored = true; startY = tempY; } if (state != REFRESHING && isRecored && state != LOADING) { // 保证在设置padding的过程中,当前的位置一直是在head,否则如果当列表超出屏幕的话,当在上推的时候,列表会同时进行滚动 // 可以松手去刷新了 if (state == RELEASE_To_REFRESH) { setSelection(0); // 往上推了,推到了屏幕足够掩盖head的程度,但是还没有推到全部掩盖的地步 if (((tempY - startY) / RATIO < headContentHeight) && (tempY - startY) > 0) { state = PULL_To_REFRESH; changeHeaderViewByState(); Log.v(TAG, "由松开刷新状态转变到下拉刷新状态"); } // 一下子推到顶了 else if (tempY - startY <= 0) { state = DONE; changeHeaderViewByState(); Log.v(TAG, "由松开刷新状态转变到done状态"); } // 往下拉了,或者还没有上推到屏幕顶部掩盖head的地步 else { // 不用进行特别的操作,只用更新paddingTop的值就行了 } } // 还没有到达显示松开刷新的时候,DONE或者是PULL_To_REFRESH状态 if (state == PULL_To_REFRESH) { setSelection(0); // 下拉到可以进入RELEASE_TO_REFRESH的状态 if ((tempY - startY) / RATIO >= headContentHeight) { state = RELEASE_To_REFRESH; isBack = true; changeHeaderViewByState(); Log.v(TAG, "由done或者下拉刷新状态转变到松开刷新"); } // 上推到顶了 else if (tempY - startY <= 0) { state = DONE; changeHeaderViewByState(); Log.v(TAG, "由DOne或者下拉刷新状态转变到done状态"); } } // done状态下 if (state == DONE) { if (tempY - startY > 0) { state = PULL_To_REFRESH; changeHeaderViewByState(); } } // 更新headView的size if (state == PULL_To_REFRESH) { headView.setPadding(0, -1 * headContentHeight + (tempY - startY) / RATIO, 0, 0); } // 更新headView的paddingTop if (state == RELEASE_To_REFRESH) { headView.setPadding(0, (tempY - startY) / RATIO - headContentHeight, 0, 0); } } break; } } return super.onTouchEvent(event); } // 当状态改变时候,调用该方法,以更新界面 private void changeHeaderViewByState() { switch (state) { case RELEASE_To_REFRESH: arrowImageView.setVisibility(View.VISIBLE); progressBar.setVisibility(View.GONE); tipsTextview.setVisibility(View.VISIBLE); lastUpdatedTextView.setVisibility(View.VISIBLE); arrowImageView.clearAnimation(); arrowImageView.startAnimation(animation); tipsTextview.setText("松开刷新"); Log.v(TAG, "当前状态,松开刷新"); break; case PULL_To_REFRESH: progressBar.setVisibility(View.GONE); tipsTextview.setVisibility(View.VISIBLE); lastUpdatedTextView.setVisibility(View.VISIBLE); arrowImageView.clearAnimation(); arrowImageView.setVisibility(View.VISIBLE); // 是由RELEASE_To_REFRESH状态转变来的 if (isBack) { isBack = false; arrowImageView.clearAnimation(); arrowImageView.startAnimation(reverseAnimation); tipsTextview.setText("下拉刷新"); } else { tipsTextview.setText("下拉刷新"); } Log.v(TAG, "当前状态,下拉刷新"); break; case REFRESHING: headView.setPadding(0, 0, 0, 0); progressBar.setVisibility(View.VISIBLE); arrowImageView.clearAnimation(); arrowImageView.setVisibility(View.GONE); tipsTextview.setText("正在刷新..."); lastUpdatedTextView.setVisibility(View.VISIBLE); Log.v(TAG, "当前状态,正在刷新..."); break; case DONE: headView.setPadding(0, -1 * headContentHeight, 0, 0); progressBar.setVisibility(View.GONE); arrowImageView.clearAnimation(); arrowImageView.setImageResource(R.drawable.arrow); tipsTextview.setText("下拉刷新"); lastUpdatedTextView.setVisibility(View.VISIBLE); Log.v(TAG, "当前状态,done"); break; } } public void setOnRefreshListener(OnRefreshListener refreshListener) { this.refreshListener = refreshListener; isRefreshable = true; } public void setOnUpRefreshListener(OnUpRefreshListener upRefreshListener) { this.upRefreshListener = upRefreshListener; isUpRefreshable = true; } //下拉刷新回调接口 public interface OnRefreshListener { public void onRefresh(); } //拖动到最后再上刷新回调接口 public interface OnUpRefreshListener { public void onUpRefresh(); } //刷新完成后,调用此方法更新UI public void onRefreshComplete() { state = DONE; lastUpdatedTextView.setText("最近更新:" + new Date().toLocaleString()); changeHeaderViewByState(); } //上拉动刷新完成后,调用此方法更新UI public void onUpRefreshComplete() { footerProgressBar.setVisibility(View.GONE); footerBtn.setText("向上拖动加载更多..."); } private void onRefresh() { if (refreshListener != null) { refreshListener.onRefresh(); } } private void onUpRefresh() { if (upRefreshListener != null) { upRefreshListener.onUpRefresh(); } } // 此方法直接照搬自网络上的一个下拉刷新的demo,此处是“估计”headView的width以及height private void measureView(View child) { ViewGroup.LayoutParams p = child.getLayoutParams(); if (p == null) { p = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.FILL_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); } public void setAdapter(BaseAdapter adapter) { lastUpdatedTextView.setText("最近更新:" + new Date().toLocaleString()); super.setAdapter(adapter); } }
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