package com.chinaztt.fda.widget;
import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.animation.LinearInterpolator;
import android.view.animation.RotateAnimation;
import android.widget.AbsListView;
import android.widget.AbsListView.OnScrollListener;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.ProgressBar;
import android.widget.TextView;
import com.chinaztt.fda.ui.R;
import com.chinaztt.fda.utils.Log;
/**
* 当前类注释:下拉刷新，上拉加载更多组件
* 项目名：FastDev4Android
* 包名：com.chinaztt.fda.widget
* 作者：江清清 on 15/10/23 13:32
* 邮箱：jiangqqlmj@163.com
* QQ： 781931404
* 公司：江苏中天科技软件技术有限公司
*/
public class PullToRefreshListView extends ListView implements OnScrollListener, OnClickListener {
/**
* 下拉状态
*/
private static final int PULL_TO_REFRESH = 1; //下拉-默认为初始状态 准备下拉刷新
private static final int RELEASE_TO_REFRESH = 2; //释放刷新
private static final int REFRESHING = 3; //正在刷新
private static final String TAG = "PullRefreshListView";
private OnRefreshListener mOnRefreshListener;
/**
* 组件滑动监听器 scroll 当view在进行下拉滑动的时候，判断滑动的距离，
* 如果达到可以进行刷新的临界点时候，回调当前接口中的方法
* Listener that will receive notifications every time the list scrolls.
*/
private OnScrollListener mOnScrollListener;
//下拉刷新的的头部view
private LinearLayout mRefreshView;
private ImageView mRefreshViewImage;
private ProgressBar mRefreshViewProgress;
private TextView mRefreshViewText;
private TextView mRefreshViewLastUpdated;
private int mRefreshState;
private int mCurrentScrollState;
private RotateAnimation mFlipAnimation;
private RotateAnimation mReverseFlipAnimation;
private int mRefreshViewHeight;
private int mRefreshOriginalTopPadding;
private int mLastMotionY;
public PullToRefreshListView(Context context) {
super(context);
init(context);
}
public PullToRefreshListView(Context context, AttributeSet attrs) {
super(context, attrs);
init(context);
}
private void init(Context context) {
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(-180, 0,
RotateAnimation.RELATIVE_TO_SELF, 0.5f,
RotateAnimation.RELATIVE_TO_SELF, 0.5f);
mReverseFlipAnimation.setInterpolator(new LinearInterpolator());
mReverseFlipAnimation.setDuration(250);
mReverseFlipAnimation.setFillAfter(true);
mRefreshView = (LinearLayout) View.inflate(context, R.layout.pull_to_refresh_header, null);
mRefreshViewText = (TextView) mRefreshView.findViewById(R.id.pull_to_refresh_text);
mRefreshViewImage = (ImageView) mRefreshView.findViewById(R.id.pull_to_refresh_image);
mRefreshViewProgress = (ProgressBar) mRefreshView.findViewById(R.id.pull_to_refresh_progress);
mRefreshViewLastUpdated = (TextView) mRefreshView.findViewById(R.id.pull_to_refresh_updated_at);
mRefreshState = PULL_TO_REFRESH;
mRefreshViewImage.setMinimumHeight(50); //设置下拉最小的高度为50
setFadingEdgeLength(0);
setHeaderDividersEnabled(false);
//把refreshview加入到listview的头部
addHeaderView(mRefreshView);
super.setOnScrollListener(this);
mRefreshView.setOnClickListener(this);
mRefreshView.measure(MeasureSpec.UNSPECIFIED, MeasureSpec.UNSPECIFIED);
mRefreshViewHeight = mRefreshView.getMeasuredHeight();
mRefreshOriginalTopPadding = -mRefreshViewHeight;
resetHeaderPadding();
}
/**
* Set the listener that will receive notifications every time the list scrolls.
*
* @param l The scroll listener.
*/
@Override
public void setOnScrollListener(OnScrollListener l) {
mOnScrollListener = l;
}
/**
* 注册listview下拉刷新回到接口
* Register a callback to be invoked when this list should be refreshed.
*
* @param onRefreshListener The callback to run.
*/
public void setOnRefreshListener(OnRefreshListener onRefreshListener) {
mOnRefreshListener = onRefreshListener;
}
/**
* 进行设置设置上一次更新的时候
*
* Set a text to represent when the list was last updated.
* @param lastUpdated Last updated at.
*/
public void setLastUpdated(CharSequence lastUpdated) {
if (lastUpdated != null) {
mRefreshViewLastUpdated.setVisibility(View.VISIBLE);
mRefreshViewLastUpdated.setText(lastUpdated);
} else {
mRefreshViewLastUpdated.setVisibility(View.GONE);
}
}
/**
* touch事件处理
* @param event
* @return
*/
@Override
public boolean onTouchEvent(MotionEvent event) {
final int y = (int) event.getY();
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
mLastMotionY = y;
break;
case MotionEvent.ACTION_MOVE:
int offsetY = (int) event.getY();
int deltY = Math.round(offsetY - mLastMotionY);
mLastMotionY = offsetY;
if (getFirstVisiblePosition() == 0 && mRefreshState != REFRESHING) {
deltY = deltY / 2;
mRefreshOriginalTopPadding += deltY;
if (mRefreshOriginalTopPadding < -mRefreshViewHeight) {
mRefreshOriginalTopPadding = -mRefreshViewHeight;
}
resetHeaderPadding();
}
break;
case MotionEvent.ACTION_UP:
//当手指抬开得时候 进行判断下拉的距离 ，如果>=临界值，那么进行刷洗，否则回归原位
if (!isVerticalScrollBarEnabled()) {
setVerticalScrollBarEnabled(true);
}
if (getFirstVisiblePosition() == 0 && mRefreshState != REFRESHING) {
if (mRefreshView.getBottom() >= mRefreshViewHeight
&& mRefreshState == RELEASE_TO_REFRESH) {
//准备开始刷新
prepareForRefresh();
} else {
// Abort refresh
resetHeader();
}
}
break;
}
return super.onTouchEvent(event);
}
@Override
public void onScroll(AbsListView view, int firstVisibleItem,
int visibleItemCount, int totalItemCount) {
if (mCurrentScrollState == SCROLL_STATE_TOUCH_SCROLL && mRefreshState != REFRESHING) {
if (firstVisibleItem == 0) {
if ((mRefreshView.getBottom() >= mRefreshViewHeight)
&& mRefreshState != RELEASE_TO_REFRESH) {
mRefreshViewText.setText(R.string.pull_to_refresh_release_label_it);
mRefreshViewImage.clearAnimation();
mRefreshViewImage.startAnimation(mFlipAnimation);
mRefreshState = RELEASE_TO_REFRESH;
} else if (mRefreshView.getBottom() < mRefreshViewHeight
&& mRefreshState != PULL_TO_REFRESH) {
mRefreshViewText.setText(R.string.pull_to_refresh_pull_label_it);
mRefreshViewImage.clearAnimation();
mRefreshViewImage.startAnimation(mReverseFlipAnimation);
mRefreshState = PULL_TO_REFRESH;
}
}
}
if (mOnScrollListener != null) {
mOnScrollListener.onScroll(view, firstVisibleItem, visibleItemCount, totalItemCount);
}
}
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
mCurrentScrollState = scrollState;
if (mOnScrollListener != null) {
mOnScrollListener.onScrollStateChanged(view, scrollState);
}
}
/**
* Sets the header padding back to original size.
*/
private void resetHeaderPadding() {
mRefreshView.setPadding(
mRefreshView.getPaddingLeft(),
mRefreshOriginalTopPadding,
mRefreshView.getPaddingRight(),
mRefreshView.getPaddingBottom());
}
public void prepareForRefresh() {
if (mRefreshState != REFRESHING) {
mRefreshState = REFRESHING;
mRefreshOriginalTopPadding = 0;
resetHeaderPadding();
mRefreshViewImage.clearAnimation();
mRefreshViewImage.setVisibility(View.GONE);
mRefreshViewProgress.setVisibility(View.VISIBLE);
mRefreshViewText.setText(R.string.pull_to_refresh_refreshing_label_it);
onRefresh();
}
}
private void resetHeader() {
mRefreshState = PULL_TO_REFRESH;
mRefreshOriginalTopPadding = -mRefreshViewHeight;
resetHeaderPadding();
mRefreshViewImage.clearAnimation();
mRefreshViewImage.setVisibility(View.VISIBLE);
mRefreshViewProgress.setVisibility(View.GONE);
mRefreshViewText.setText(R.string.pull_to_refresh_pull_label_it);
}
/**
* 开始回调刷新
*/
public void onRefresh() {
Log.d(TAG, "onRefresh");
if (mOnRefreshListener != null) {
mOnRefreshListener.onRefresh();
}
}
/**
* Resets the list to a normal state after a refresh.
*/
public void onRefreshComplete() {
Log.d(TAG, "onRefreshComplete");
resetHeader();
}
@Override
public void onClick(View v) {
Log.d(TAG, "onClick");
}
/**
* Interface definition for a callback to be invoked when list should be
* refreshed.
*/
public interface OnRefreshListener {
/**
* Called when the list should be refreshed.
* <p>
* A call to {@link PullToRefreshListView #onRefreshComplete()} is
* expected to indicate that the refresh has completed.
*/
public void onRefresh();
}
}