package com.lzx.demo.view;
import android.content.Context;
import android.support.design.widget.AppBarLayout;
import android.support.design.widget.CoordinatorLayout;
import android.support.v4.content.ContextCompat;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewParent;
import android.widget.LinearLayout;
import android.widget.ScrollView;
import com.github.jdsjlzx.interfaces.IRefreshHeader;
import com.github.jdsjlzx.recyclerview.AppBarStateChangeListener;
import com.github.jdsjlzx.view.ArrowRefreshHeader;
/**
* 自定义下拉刷新ScrollView
* <p/>
*/
public class PullScrollView extends ScrollView {
private RefreshListener mRefreshListener;
private IRefreshHeader mRefreshHeader;
private boolean isRefreshEnabled = true; //设置下拉刷新是否可用
private float dragRate = 2; //下拉刷新滑动阻力系数，越大需要手指下拉的距离越大才能刷新
private boolean isRefreshing; //是否正在刷新
private float mLastY = -1; //上次触摸的的Y值
private int topY;
private float sumOffSet;
private boolean isAdded;
private AppBarStateChangeListener.State appbarState = AppBarStateChangeListener.State.EXPANDED;
public PullScrollView(Context context) {
this(context, null);
}
public PullScrollView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public PullScrollView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init();
}
private void init() {
if (isRefreshEnabled) {
mRefreshHeader = new ArrowRefreshHeader(getContext());
}
}
private void setLayout() {
if (!isAdded) {
isAdded = true;
ViewGroup group = (ViewGroup) getParent();
LinearLayout container = new LinearLayout(getContext());
container.setOrientation(LinearLayout.VERTICAL);
int index = group.indexOfChild(this);
group.removeView(this);
group.addView(container, index, getLayoutParams());
container.addView(mRefreshHeader.getHeaderView(), new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT));
container.addView(this, new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
}
}
public View getRefreshHeaderView() {
return mRefreshHeader.getHeaderView();
}
/**
* 设置下拉刷新上拉加载回调
*/
public void setRefreshListener(RefreshListener listener) {
mRefreshListener = listener;
}
/**
* 设置自定义的header
*/
public void setRefreshHeader(IRefreshHeader mRefreshHeader) {
this.mRefreshHeader = mRefreshHeader;
}
/**
* 下拉刷新是否可用
*/
public void setPullRefreshEnabled(boolean enabled) {
isRefreshEnabled = enabled;
}
/**
* 下拉刷新滑动阻力系数，越大需要手指下拉的距离越大才能刷新
*/
public void setDragRate(int dragRate) {
this.dragRate = dragRate;
}
/**
* 设置下拉刷新的进度条风格
*/
public void setRefreshProgressStyle(int style) {
if (mRefreshHeader != null && mRefreshHeader instanceof ArrowRefreshHeader) {
((ArrowRefreshHeader) mRefreshHeader).setProgressStyle(style);
}
}
/**
* 设置下拉刷新的箭头图标
*/
public void setArrowImageView(int resId) {
if (mRefreshHeader != null && mRefreshHeader instanceof ArrowRefreshHeader) {
((ArrowRefreshHeader) mRefreshHeader).setArrowImageView(resId);
}
}
/**
* 设置颜色
* @param indicatorColor Only call the method setRefreshProgressStyle(int style) to take effect
* @param hintColor
* @param backgroundColor
*/
public void setHeaderViewColor(int indicatorColor, int hintColor, int backgroundColor) {
if (mRefreshHeader != null && mRefreshHeader instanceof ArrowRefreshHeader) {
ArrowRefreshHeader arrowRefreshHeader = ((ArrowRefreshHeader) mRefreshHeader);
arrowRefreshHeader.setIndicatorColor(ContextCompat.getColor(getContext(),indicatorColor));
arrowRefreshHeader.setHintTextColor(hintColor);
arrowRefreshHeader.setViewBackgroundColor(backgroundColor);
}
}
/**
* 手动调用直接刷新，无下拉效果
*/
public void refresh() {
if (mRefreshListener != null) {
isRefreshing = true;
mRefreshListener.onRefresh();
}
}
/**
* 手动调用下拉刷新，有下拉效果
*/
public void refreshWithPull() {
setRefreshing(true);
refresh();
}
/**
* 下拉刷新和到底加载完成
*/
public void setRefreshCompleted() {
if (isRefreshing) {
isRefreshing = false;
mRefreshHeader.refreshComplete();
}
}
/**
* 手动调用加载状态，此函数不会调用 {@link RefreshListener#onRefresh()}加载数据
* 如果需要加载数据和状态显示调用 {@link #refreshWithPull()}
*/
public void setRefreshing(final boolean refreshing) {
if (refreshing && isRefreshEnabled) {
isRefreshing = true;
mRefreshHeader.onRefreshing();
int offSet = mRefreshHeader.getHeaderView()
.getMeasuredHeight();
mRefreshHeader.onMove(offSet, offSet);
}
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
if (mLastY == -1) {
mLastY = ev.getRawY();
}
switch (ev.getAction()) {
case MotionEvent.ACTION_DOWN:
mLastY = ev.getRawY();
sumOffSet = 0;
break;
case MotionEvent.ACTION_MOVE:
final float deltaY = (ev.getRawY() - mLastY) / dragRate;
mLastY = ev.getRawY();
sumOffSet += deltaY;
if (isOnTop() && isRefreshEnabled && appbarState == AppBarStateChangeListener.State.EXPANDED) {
mRefreshHeader.onMove(deltaY, sumOffSet);
if (mRefreshHeader.getVisibleHeight() > 0 && !isRefreshing) {
return false;
}
}
break;
default:
mLastY = -1; // reset
if (isOnTop() && isRefreshEnabled && appbarState == AppBarStateChangeListener.State.EXPANDED) {
if (mRefreshHeader.onRelease()) {
if (mRefreshListener != null) {
isRefreshing = true;
mRefreshListener.onRefresh();
}
}
}
break;
}
return super.onTouchEvent(ev);
}
@Override
protected void onScrollChanged(int l, int t, int oldl, int oldt) {
super.onScrollChanged(l, t, oldl, oldt);
topY = t;
}
/**
* 如果在HeaderView已经被添加到布局中，说明已经到顶部
*/
private boolean isOnTop() {
return topY == 0;
}
@Override
protected void onAttachedToWindow() {
super.onAttachedToWindow();
//解决和AppBarLayout冲突的问题
ViewParent p = getParent();
while (p != null) {
if (p instanceof CoordinatorLayout) {
break;
}
p = p.getParent();
}
if (p != null) {
AppBarLayout appBarLayout = null;
CoordinatorLayout coordinatorLayout = (CoordinatorLayout) p;
final int childCount = coordinatorLayout.getChildCount();
for (int i = childCount - 1; i >= 0; i--) {
final View child = coordinatorLayout.getChildAt(i);
if (child instanceof AppBarLayout) {
appBarLayout = (AppBarLayout) child;
break;
}
}
if (appBarLayout != null) {
appBarLayout.addOnOffsetChangedListener(new AppBarStateChangeListener() {
@Override
public void onStateChanged(AppBarLayout appBarLayout, State state) {
appbarState = state;
}
});
}
}
setLayout();
}
public interface RefreshListener {
void onRefresh();
}
}