package com.minimaxhk.view;
import android.content.Context;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewConfiguration;
import android.view.ViewGroup;
import android.view.animation.LinearInterpolator;
import android.view.animation.RotateAnimation;
import android.widget.AdapterView;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ProgressBar;
import android.widget.ScrollView;
import android.widget.TextView;
import com.minimaxhk.cmis.R;
public class PullToRefreshView extends LinearLayout {
private static final String TAG = "PullToRefreshView";
// refresh states
private static final int PULL_TO_REFRESH = 2;
private static final int RELEASE_TO_REFRESH = 3;
private static final int REFRESHING = 4;
// pull state
private static final int PULL_UP_STATE = 0;
private static final int PULL_DOWN_STATE = 1;
/**
* last y
*/
private int mLastMotionY;
/**
* lock
*/
private boolean mLock;
/**
* header view
*/
private View mHeaderView;
/**
* footer view
*/
private View mFooterView;
/**
* list or grid
*/
private AdapterView<?> mAdapterView;
/**
* scrollview
*/
private ScrollView mScrollView;
/**
* header view height
*/
private int mHeaderViewHeight;
/**
* footer view height
*/
private int mFooterViewHeight;
/**
* header view image
*/
private ImageView mHeaderImageView;
/**
* footer view image
*/
private ImageView mFooterImageView;
/**
* header tip text
*/
private TextView mHeaderTextView;
/**
* footer tip text
*/
private TextView mFooterTextView;
/**
* header refresh time
*/
private TextView mHeaderUpdateTextView;
/**
* footer refresh time
*/
// private TextView mFooterUpdateTextView;
/**
* header progress bar
*/
private ProgressBar mHeaderProgressBar;
/**
* footer progress bar
*/
private ProgressBar mFooterProgressBar;
/**
* layout inflater
*/
private LayoutInflater mInflater;
/**
* header view current state
*/
private int mHeaderState;
/**
* footer view current state
*/
private int mFooterState;
/**
* pull state,pull up or pull down;PULL_UP_STATE or PULL_DOWN_STATE
*/
private int mPullState;
/**
* 變爲向下的箭頭,改變箭頭方向
*/
private RotateAnimation mFlipAnimation;
/**
* 變爲逆向的箭頭,旋轉
*/
private RotateAnimation mReverseFlipAnimation;
/**
* footer refresh listener
*/
private OnFooterRefreshListener mOnFooterRefreshListener;
/**
* footer refresh listener
*/
private OnHeaderRefreshListener mOnHeaderRefreshListener;
/**
* last update time
*/
private String mLastUpdateTime;
private boolean canRefreshFooter = false;
private int mTouchSlop;
public PullToRefreshView(Context context, AttributeSet attrs) {
super(context, attrs);
init(context);
}
public PullToRefreshView(Context context) {
super(context);
init(context);
}
/**
* init
*
* @param context
*/
private void init(Context context) {
mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
// Load all of the animations we need in code rather than through XML
mFlipAnimation = new RotateAnimation(0, -180,
RotateAnimation.RELATIVE_TO_SELF, 0.5f,
RotateAnimation.RELATIVE_TO_SELF, 0.5f);
mFlipAnimation.setInterpolator(new LinearInterpolator());
mFlipAnimation.setDuration(250);
mFlipAnimation.setFillAfter(true);
mReverseFlipAnimation = new RotateAnimation(0, 180,
RotateAnimation.RELATIVE_TO_SELF, 0.5f,
RotateAnimation.RELATIVE_TO_SELF, 0.5f);
mReverseFlipAnimation.setInterpolator(new LinearInterpolator());
mReverseFlipAnimation.setDuration(250);
mReverseFlipAnimation.setFillAfter(true);
mInflater = LayoutInflater.from(getContext());
// header view 在此添加,保證是第一個添加到linearlayout的最上端
addHeaderView();
}
private void addHeaderView() {
// header view
mHeaderView = mInflater.inflate(R.layout.refresh_header, this, false);
mHeaderImageView = (ImageView) mHeaderView
.findViewById(R.id.pull_to_refresh_image);
mHeaderTextView = (TextView) mHeaderView
.findViewById(R.id.pull_to_refresh_text);
mHeaderUpdateTextView = (TextView) mHeaderView
.findViewById(R.id.pull_to_refresh_updated_at);
mHeaderProgressBar = (ProgressBar) mHeaderView
.findViewById(R.id.pull_to_refresh_progress);
// header layout
measureView(mHeaderView);
mHeaderViewHeight = mHeaderView.getMeasuredHeight();
LayoutParams params = new LayoutParams(LayoutParams.MATCH_PARENT,
mHeaderViewHeight);
// 設置topMargin的值爲負的header View高度,即將其隱藏在最上方
params.topMargin = -(mHeaderViewHeight);
// mHeaderView.setLayoutParams(params1);
addView(mHeaderView, params);
}
private void addFooterView() {
// footer view
mFooterView = mInflater.inflate(R.layout.refresh_footer, this, false);
if (!canRefreshFooter) {
mFooterView.setVisibility(View.GONE);
}
mFooterImageView = (ImageView) mFooterView
.findViewById(R.id.pull_to_load_image);
mFooterTextView = (TextView) mFooterView
.findViewById(R.id.pull_to_load_text);
mFooterProgressBar = (ProgressBar) mFooterView
.findViewById(R.id.pull_to_load_progress);
// footer layout
measureView(mFooterView);
mFooterViewHeight = mFooterView.getMeasuredHeight();
LayoutParams params = new LayoutParams(LayoutParams.MATCH_PARENT,
mFooterViewHeight);
// int top = getHeight();
// params.topMargin
// =getHeight();//在這裏getHeight()==0,但在onInterceptTouchEvent()方法裏getHeight()已經有值了,不再是0;
// getHeight()什麼時候會賦值,稍候再研究一下
// 由於是線性佈局可以直接添加,只要AdapterView的高度是MATCH_PARENT,那麼footer view就會被添加到最後,並隱藏
addView(mFooterView, params);
}
@Override
protected void onFinishInflate() {
super.onFinishInflate();
// footer view 在此添加保證添加到linearlayout中的最後
addFooterView();
initContentAdapterView();
}
/**
* init AdapterView like ListView,GridView and so on;or init ScrollView
*
*/
private void initContentAdapterView() {
int count = getChildCount();
if (count < 3) {
throw new IllegalArgumentException(
"this layout must contain 3 child views,and AdapterView or ScrollView must in the second position!");
}
View view = null;
for (int i = 0; i < count - 1; ++i) {
view = getChildAt(i);
if (view instanceof AdapterView<?>) {
mAdapterView = (AdapterView<?>) view;
}
if (view instanceof ScrollView) {
// finish later
mScrollView = (ScrollView) view;
}
}
if (mAdapterView == null && mScrollView == null) {
throw new IllegalArgumentException(
"must contain a AdapterView or ScrollView in this layout!");
}
}
private void measureView(View child) {
ViewGroup.LayoutParams p = child.getLayoutParams();
if (p == null) {
p = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_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);
}
@Override
public boolean onInterceptTouchEvent(MotionEvent e) {
int y = (int) e.getRawY();
switch (e.getAction()) {
case MotionEvent.ACTION_DOWN:
// 首先攔截down事件,記錄y座標
mLastMotionY = y;
break;
case MotionEvent.ACTION_MOVE:
// deltaY > 0 是向下運動,< 0是向上運動
int deltaY = y - mLastMotionY;
if (isRefreshViewScroll(deltaY)) {
return true;
}
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
break;
}
return false;
}
/**
* 如果在onInterceptTouchEvent()方法中沒有攔截(即onInterceptTouchEvent()方法中 return
* false)則由PullToRefreshView 的子View來處理;否則由下面的方法來處理(即由PullToRefreshView自己來處理)
*/
@Override
public boolean onTouchEvent(MotionEvent event) {
if (mLock) {
return true;
}
int y = (int) event.getRawY();
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
// onInterceptTouchEvent已經記錄
// mLastMotionY = y;
break;
case MotionEvent.ACTION_MOVE:
int deltaY = y - mLastMotionY;
if (mPullState == PULL_DOWN_STATE) {
// PullToRefreshView執行下拉
// Log.i(TAG, " pull down!parent view move!");
headerPrepareToRefresh(deltaY);
// setHeaderPadding(-mHeaderViewHeight);
} else if (mPullState == PULL_UP_STATE) {
// PullToRefreshView執行上拉
// Log.i(TAG, "pull up!parent view move!");
footerPrepareToRefresh(deltaY);
}
mLastMotionY = y;
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
int topMargin = getHeaderTopMargin();
if (mPullState == PULL_DOWN_STATE) {
if (topMargin >= 0) {
// 開始刷新
headerRefreshing();
} else {
// 還沒有執行刷新,重新隱藏
setHeaderTopMargin(-mHeaderViewHeight);
}
} else if (mPullState == PULL_UP_STATE) {
if (Math.abs(topMargin) >= mHeaderViewHeight
+ mFooterViewHeight) {
// 開始執行footer 刷新
footerRefreshing();
} else {
// 還沒有執行刷新,重新隱藏
setHeaderTopMargin(-mHeaderViewHeight);
}
}
break;
}
return super.onTouchEvent(event);
}
/**
* 是否應該到了父View,即PullToRefreshView滑動
*
* @param deltaY
* , deltaY > 0 是向下運動,< 0是向上運動
* @return
*/
private boolean isRefreshViewScroll(int deltaY) {
if (mHeaderState == REFRESHING || mFooterState == REFRESHING) {
return false;
}
// 對於ListView和GridView
if (mAdapterView != null) {
// 子view(ListView or GridView)滑動到最頂端
if (deltaY > mTouchSlop) {
View child = mAdapterView.getChildAt(0);
if (child == null) {
// 如果mAdapterView中沒有數據,不攔截
return false;
}
if (mAdapterView.getFirstVisiblePosition() == 0
&& child.getTop() == 0) {
mPullState = PULL_DOWN_STATE;
return true;
}
int top = child.getTop();
int padding = mAdapterView.getPaddingTop();
if (mAdapterView.getFirstVisiblePosition() == 0
&& Math.abs(top - padding) <= 8) {// 這裏之前用3可以判斷,但現在不行,還沒找到原因
mPullState = PULL_DOWN_STATE;
return true;
}
} else if (deltaY < -mTouchSlop) {
View lastChild = mAdapterView.getChildAt(mAdapterView
.getChildCount() - 1);
if (lastChild == null) {
// 如果mAdapterView中沒有數據,不攔截
return false;
}
// 最後一個子view的Bottom小於父View的高度說明mAdapterView的數據沒有填滿父view,
// 等於父View的高度說明mAdapterView已經滑動到最後
if (lastChild.getBottom() <= getHeight()
&& mAdapterView.getLastVisiblePosition() == mAdapterView
.getCount() - 1) {
mPullState = PULL_UP_STATE;
return true;
}
}
}
// 對於ScrollView
if (mScrollView != null) {
// 子scroll view滑動到最頂端
View child = mScrollView.getChildAt(0);
if (deltaY > 0 && mScrollView.getScrollY() == 0) {
mPullState = PULL_DOWN_STATE;
return true;
} else if (deltaY < 0
&& child.getMeasuredHeight() <= getHeight()
+ mScrollView.getScrollY()) {
mPullState = PULL_UP_STATE;
return true;
}
}
return false;
}
/**
* header 準備刷新,手指移動過程,還沒有釋放
*
* @param deltaY
* ,手指滑動的距離
*/
private void headerPrepareToRefresh(int deltaY) {
int newTopMargin = changingHeaderViewTopMargin(deltaY);
// System.out.println("newTopMargin: "+newTopMargin);
// System.out.println("mHeaderViewHeight: "+mHeaderViewHeight);
// 當header view的topMargin>=0時,說明已經完全顯示出來了,修改header view 的提示狀態
if (newTopMargin >= 0 && mHeaderState != RELEASE_TO_REFRESH) {
mHeaderTextView.setText(R.string.pull_to_refresh_release_label);
mHeaderUpdateTextView.setVisibility(View.VISIBLE);
mHeaderImageView.clearAnimation();
mHeaderImageView.startAnimation(mFlipAnimation);
mHeaderState = RELEASE_TO_REFRESH;
} else if (newTopMargin < 0 && newTopMargin > -mHeaderViewHeight) {// 拖動時沒有釋放
mHeaderImageView.clearAnimation();
mHeaderImageView.startAnimation(mReverseFlipAnimation);
// mHeaderImageView.
mHeaderTextView.setText(R.string.pull_to_refresh_pull_label);
mHeaderState = PULL_TO_REFRESH;
}
}
/**
* footer 準備刷新,手指移動過程,還沒有釋放 移動footer view高度同樣和移動header view
* 高度是一樣,都是通過修改header view的topmargin的值來達到
*
* @param deltaY ,手指滑動的距離
*
*/
private void footerPrepareToRefresh(int deltaY) {
int newTopMargin = changingHeaderViewTopMargin(deltaY);
// 如果header view topMargin 的絕對值大於或等於header + footer 的高度
// 說明footer view 完全顯示出來了,修改footer view 的提示狀態
if (Math.abs(newTopMargin) >= (mHeaderViewHeight + mFooterViewHeight)
&& mFooterState != RELEASE_TO_REFRESH) {
mFooterTextView
.setText(R.string.pull_to_refresh_footer_release_label);
mFooterImageView.clearAnimation();
mFooterImageView.startAnimation(mFlipAnimation);
mFooterState = RELEASE_TO_REFRESH;
} else if (Math.abs(newTopMargin) < (mHeaderViewHeight + mFooterViewHeight)) {
mFooterImageView.clearAnimation();
mFooterImageView.startAnimation(mFlipAnimation);
mFooterTextView.setText(R.string.pull_to_refresh_footer_pull_label);
mFooterState = PULL_TO_REFRESH;
}
}
/**
* 修改Header view top margin的值
*
* @param deltaY
*/
private int changingHeaderViewTopMargin(int deltaY) {
LayoutParams params = (LayoutParams) mHeaderView.getLayoutParams();
float newTopMargin = params.topMargin + deltaY * 0.3f;
// 這裏對上拉做一下限制,因爲當前上拉後然後不釋放手指直接下拉,會把下拉刷新給觸發了
// 表示如果是在上拉後一段距離,然後直接下拉
if (deltaY > 0 && mPullState == PULL_UP_STATE
&& Math.abs(params.topMargin) <= mHeaderViewHeight) {
return params.topMargin;
}
// 同樣地,對下拉做一下限制,避免出現跟上拉操作時一樣的bug
if (deltaY < 0 && mPullState == PULL_DOWN_STATE
&& Math.abs(params.topMargin) >= mHeaderViewHeight) {
return params.topMargin;
}
params.topMargin = (int) newTopMargin;
mHeaderView.setLayoutParams(params);
invalidate();
return params.topMargin;
}
/**
* header refreshing
*
*/
private void headerRefreshing() {
mHeaderState = REFRESHING;
setHeaderTopMargin(0);
mHeaderImageView.setVisibility(View.GONE);
mHeaderImageView.clearAnimation();
mHeaderImageView.setImageDrawable(null);
mHeaderProgressBar.setVisibility(View.VISIBLE);
mHeaderTextView.setText(R.string.pull_to_refresh_refreshing_label);
if (mOnHeaderRefreshListener != null) {
mOnHeaderRefreshListener.onHeaderRefresh(this);
}
}
/**
* footer refreshing
*
*/
private void footerRefreshing() {
mFooterState = REFRESHING;
int top = mHeaderViewHeight + mFooterViewHeight;
setHeaderTopMargin(-top);
mFooterImageView.setVisibility(View.GONE);
mFooterImageView.clearAnimation();
mFooterImageView.setImageDrawable(null);
mFooterProgressBar.setVisibility(View.VISIBLE);
mFooterTextView
.setText(R.string.pull_to_refresh_footer_refreshing_label);
if (mOnFooterRefreshListener != null) {
mOnFooterRefreshListener.onFooterRefresh(this);
}
}
/**
* 設置header view 的topMargin的值
*
* @param topMargin
* ,爲0時,說明header view 剛好完全顯示出來; 爲-mHeaderViewHeight時,說明完全隱藏了
*/
private void setHeaderTopMargin(int topMargin) {
LayoutParams params = (LayoutParams) mHeaderView.getLayoutParams();
params.topMargin = topMargin;
mHeaderView.setLayoutParams(params);
invalidate();
}
/**
* header view 完成更新後恢復初始狀態
*
*/
public void onHeaderRefreshComplete() {
setHeaderTopMargin(-mHeaderViewHeight);
mHeaderImageView.setVisibility(View.VISIBLE);
mHeaderImageView.setImageResource(R.drawable.tableview_pull_refresh_arrow_down);
mHeaderTextView.setText(R.string.pull_to_refresh_pull_label);
mHeaderProgressBar.setVisibility(View.GONE);
// mHeaderUpdateTextView.setText("");
mHeaderState = PULL_TO_REFRESH;
}
/**
* Resets the list to a normal state after a refresh.
*
* @param lastUpdated
* Last updated at.
*/
public void onHeaderRefreshComplete(CharSequence lastUpdated) {
setLastUpdated(lastUpdated);
onHeaderRefreshComplete();
}
/**
* footer view 完成更新後恢復初始狀態
*/
public void onFooterRefreshComplete() {
setHeaderTopMargin(-mHeaderViewHeight);
mFooterImageView.setVisibility(View.VISIBLE);
mFooterImageView.setImageResource(R.drawable.tableview_pull_refresh_arrow_up);
mFooterTextView.setText(R.string.pull_to_refresh_footer_pull_label);
mFooterProgressBar.setVisibility(View.GONE);
// mHeaderUpdateTextView.setText("");
mFooterState = PULL_TO_REFRESH;
}
/**
* Set a text to represent when the list was last updated.
*
* @param lastUpdated
* Last updated at.
*/
public void setLastUpdated(CharSequence lastUpdated) {
if (lastUpdated != null) {
mHeaderUpdateTextView.setVisibility(View.VISIBLE);
mHeaderUpdateTextView.setText(lastUpdated);
} else {
mHeaderUpdateTextView.setVisibility(View.GONE);
}
}
/**
* 獲取當前header view 的topMargin
*
*/
private int getHeaderTopMargin() {
LayoutParams params = (LayoutParams) mHeaderView.getLayoutParams();
return params.topMargin;
}
/**
* lock
*
*/
private void lock() {
mLock = true;
}
/**
* unlock
*
*/
private void unlock() {
mLock = false;
}
/**
* 設置能否底部加載
* @param canRefreshFooter
*/
public void setCanRefreshFooter(boolean canRefreshFooter){
this.canRefreshFooter = canRefreshFooter;
}
/**
* set headerRefreshListener
*
* @param headerRefreshListener
*/
public void setOnHeaderRefreshListener(
OnHeaderRefreshListener headerRefreshListener) {
mOnHeaderRefreshListener = headerRefreshListener;
}
public void setOnFooterRefreshListener(
OnFooterRefreshListener footerRefreshListener) {
mOnFooterRefreshListener = footerRefreshListener;
}
/**
* Interface definition for a callback to be invoked when list/grid footer
* view should be refreshed.
*/
public interface OnFooterRefreshListener {
public void onFooterRefresh(PullToRefreshView view);
}
/**
* Interface definition for a callback to be invoked when list/grid header
* view should be refreshed.
*/
public interface OnHeaderRefreshListener {
public void onHeaderRefresh(PullToRefreshView view);
}
}
下拉刷新控件
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