package com.wei.demo.view;
import android.content.Context; import android.content.res.TypedArray; import android.support.v4.view.MotionEventCompat; import android.support.v4.view.ViewCompat; import android.support.v4.widget.ViewDragHelper; import android.support.v7.widget.RecyclerView; import android.util.AttributeSet; import android.util.Log; import android.view.Gravity; import android.view.MotionEvent; import android.view.View; import android.view.ViewGroup; import android.view.animation.Animation; import android.view.animation.LinearInterpolator; import android.view.animation.RotateAnimation; import android.widget.FrameLayout; import android.widget.ImageView; import android.widget.LinearLayout; import android.widget.ListView; import android.widget.RelativeLayout; import android.widget.ScrollView; import android.widget.TextView;
import com.wei.demo.R;
/** * Created by Administrator on 2017/1/2. */
public class RefreshView extends FrameLayout {
PRivate ViewDragHelper dragHelper;private View mContentView;private ViewGroup mTopView;private ListView listView;private RecyclerView recyclerView;private ScrollView scrollView;private ImageView iv_circel;private RelativeLayout rl_content;private int mWidth, mHeight;private int maxRange = 0;//最大下拉的高度private int refreshHeight;//下拉出发刷新的高度private int text_bottom;//中间文字的底部private int downY;private int childViewTop;private boolean isMoveChildView, isLayout;//是否包含可滑动的view true包含private boolean isStop, isStartAnim;//是否停止刷新，是否开启动画//下拉刷新的状态private final int STATE_DOWN = 0;//下拉中private final int STATE_REFRESHING = 1;//刷新中private final int STATE_REFRESH = 2;//可刷新private int current_state = STATE_DOWN;//属性值private int refresh_gravity = 1;//1 top 2 center 3 bottomprivate OnRefreshListener listener;private boolean isRefresh = true;//是否可以刷新private TextView tv_text;public RefreshView(Context context) { this(context, null);}public RefreshView(Context context, AttributeSet attrs) { this(context, attrs, 0);}public RefreshView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); init(); //获取自定义属性 TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.refreshView); refresh_gravity = ta.getInt(R.styleable.refreshView_refresh_gravity, 1); ta.recycle();}public interface OnRefreshListener { void onRefresh();}public void setOnRefreshListener(OnRefreshListener listener) { this.listener = listener;}/** * 是否可以刷新 */public void setIsRefresh(boolean isRefresh) { this.isRefresh = isRefresh;}/** * 初始化ViewDragHelper */private void init() { dragHelper = ViewDragHelper.create(this, 2.0f , new MyCallBack());}@Overrideprotected void onSizeChanged(int w, int h, int oldw, int oldh) { super.onSizeChanged(w, h, oldw, oldh); mWidth = w; mHeight = h;}@Overrideprotected void onFinishInflate() { super.onFinishInflate(); //健壮性检查 if (getChildCount() > 1) { throw new RuntimeException("只能包含一个子view或viewgroup"); } if (getChildCount() == 0) { throw new RuntimeException("not childview，childview would not be null！"); } isLayout = false; //因为在onFinishInflate中添加一个viewgroup在0的位置 mContentView = getChildAt(0);//获取布局中的view isMoveChildView = childType(mContentView);//查看是否有可滑动的view //添加下拉刷新头布局 mTopView = (ViewGroup) View.inflate(getContext(), R.layout.layout_refresh, null); addView(mTopView, 0); rl_content = (RelativeLayout) mTopView.findViewById(R.id.fl_header); rl_content.measure(0, 0); refreshHeight = rl_content.getMeasuredHeight(); tv_text = (TextView) mTopView.findViewById(R.id.tv_text); iv_circel = (ImageView) mTopView.findViewById(R.id.iv_circel); iv_circel.setAlpha(0.0f); //根据设置的属性设置头布局的位置 if (refresh_gravity == 1) { rl_content.setGravity(Gravity.TOP); } else if (refresh_gravity == 2) { rl_content.setGravity(Gravity.CENTER); } else { rl_content.setGravity(Gravity.BOTTOM); }}/** * 判断此view是否是可滑动的view，或此view中是否包含可滑动的view（listview，scrollview，recyclerview） * * @param view * @return true则表示包含可滑动的view */private boolean childType(View view) { boolean conform = false; conform = isTypeConform(view, conform); if (!conform) { if (view instanceof ViewGroup) { ViewGroup viewGroup = (ViewGroup) view; int childCount = viewGroup.getChildCount(); for (int i = 0; i < childCount; i++) { View childView = viewGroup.getChildAt(i); if (childView instanceof ViewGroup) { boolean typeConform = isTypeConform(childView, conform); if (typeConform) { childViewTop = childView.getTop();//可滑动view的初始top值 return typeConform; } childType(childView); } } } } return conform;}/** * 是否是可滑动的view */private boolean isTypeConform(View view, boolean type) { if (view instanceof ListView) { type = true; listView = (ListView) view; } else if (view instanceof RecyclerView) { recyclerView = (RecyclerView) view; type = true; } else if (view instanceof ScrollView) { scrollView = (ScrollView) view; type = true; } return type;}@Overrideprotected void onLayout(boolean changed, int left, int top, int right, int bottom) { if (!isLayout) { if (iv_circel != null && isStartAnim) { iv_circel.clearAnimation(); isStartAnim = false; iv_circel.setAlpha(0.0f); } super.onLayout(changed, left, top, right, bottom); } maxRange = mHeight - refreshHeight;//最大下拉距离 text_bottom = refreshHeight - refreshHeight / 2; mTopView.layout(0, -(mHeight - refreshHeight), mWidth, refreshHeight); isLayout = false; //重新摆放刷新布局 if (refresh_gravity == 1 && mContentView.getTop() >= refreshHeight) { mTopView.setTranslationY(mContentView.getTop() - refreshHeight); }}@Overridepublic boolean onInterceptTouchEvent(MotionEvent ev) { if (ev.getAction() == MotionEvent.ACTION_DOWN) { downY = (int) ev.getY(); } return dragHelper.shouldInterceptTouchEvent(ev);}@Overridepublic boolean onTouchEvent(MotionEvent event) { dragHelper.processTouchEvent(event); return true;}private class MyCallBack extends ViewDragHelper.Callback { /** * 返回可拖拽的范围 */ @Override public int getViewVerticalDragRange(View child) { //如果包含可滑动的view if (isMoveChildView && downY > childViewTop) { if (listView != null && listView.getAdapter() != null) { View childView = listView.getChildAt(0); if (listView.getAdapter().getCount() > 0 && childView != null && childView.getTop() < 0) return super.getViewVerticalDragRange(child); } else if (scrollView != null && scrollView.getScrollY() > 0) { return super.getViewVerticalDragRange(child); } else if (recyclerView != null && recyclerView.getAdapter() != null && recyclerView.getChildAt(0).getTop() < 0) { return super.getViewVerticalDragRange(child); } } return maxRange; } /** * 返回true表示可以拖拽 */ @Override public boolean tryCaptureView(View child, int pointerId) { //如果触摸的是刷新的头部view 或者是设置为不可刷新则返回false if (child == mTopView || !isRefresh) { return false; } return true; } /** * 当被拖拽的view移动位置后，会调用此方法。可以用于处理View之间的联动 */ @Override public void onViewPositionChanged(View changedView, int left, int top, int dx, int dy) { super.onViewPositionChanged(changedView, left, top, dx, dy); //处理上面view的移动 float moveTop = (float) top /** 0.9f*/; if (moveTop >= text_bottom) { float alpha = (moveTop - text_bottom) / text_bottom; if (alpha > 1) { alpha = 1.0f; } else if (alpha < 0.0) { alpha = 0.0f; } iv_circel.setAlpha(alpha); } else { iv_circel.setAlpha(0.0f); } if (tv_text != null) { isLayout = true; tv_text.setText("下拉刷新"); } if (moveTop >= refreshHeight) { if (iv_circel != null && isStartAnim) { isStartAnim = false; iv_circel.clearAnimation(); } if (refresh_gravity == 1 || refresh_gravity == 2) { isLayout = true; LinearLayout.LayoutParams params = (LinearLayout.LayoutParams) rl_content.getLayoutParams(); params.height = (int) moveTop; rl_content.setLayoutParams(params); rl_content.requestLayout(); } if (refresh_gravity == 2 || refresh_gravity == 3) { float translationY = moveTop - refreshHeight; mTopView.setTranslationY(translationY); } } } /** * 拖拽松开时调用 */ @Override public void onViewReleased(View releasedChild, float xvel, float yvel) { super.onViewReleased(releasedChild, xvel, yvel); int mContentViewTop = mContentView.getTop(); if (mContentViewTop > refreshHeight) { current_state = STATE_REFRESH; refreshOpen(); } else { close(); } } /** * 返回top值 */ @Override public int clampViewPositionVertical(View child, int top, int dy) { float newTop = top /** 0.87f*/; if (newTop >= maxRange) { newTop = maxRange; } else if (top < 0) { newTop = 0; } return (int) newTop; }}/** * 开始刷新 并且滚动至相应的位置 */private void refreshOpen() { int top = refreshHeight; if (dragHelper.smoothSlideViewTo(mContentView, 0, top)) { ViewCompat.postInvalidateOnAnimation(this); }}/** * 关闭面板 此时下拉的高度没有达到刷新的高度，滚动至0的位置 */private void close() { int top = 0; if (dragHelper.smoothSlideViewTo(mContentView, 0, top)) { ViewCompat.postInvalidateOnAnimation(this); } mContentView.setFocusable(true); isLayout = false; current_state = STATE_DOWN; iv_circel.clearAnimation();}@Overridepublic void computeScroll() {// super.computeScroll(); if (dragHelper.continueSettling(true)) { ViewCompat.postInvalidateOnAnimation(this); } else if (mContentView.getTop() >= refreshHeight && current_state == STATE_REFRESH) { startAnim(); current_state = STATE_REFRESHING;//改变状态 if (listener != null) { listener.onRefresh(); } if (tv_text != null) { tv_text.setText(“刷新中”); isLayout = true; } mContentView.setFocusable(false); } }
private long duration = 500L;private void startAnim() { isStop = false; duration = 500L; isStartAnim = true; RotateAnimation anim = new RotateAnimation(0, 360, Animation.RELATIVE_TO_SELF, 0.5F, Animation.RELATIVE_TO_SELF, 0.5F); anim.setDuration(duration); anim.setRepeatCount(Animation.INFINITE); anim.setInterpolator(new LinearInterpolator()); iv_circel.startAnimation(anim); anim.setAnimationListener(new Animation.AnimationListener() { @Override public void onAnimationStart(Animation animation) { } @Override public void onAnimationEnd(Animation animation) { current_state = STATE_DOWN;//清楚动画的同时并改变是否刷新的状态 if (tv_text != null) { isLayout = true; tv_text.setText("刷新完毕"); } postDelayed(new Runnable() { @Override public void run() { close();//回滚至顶部 } }, 300); } @Override public void onAnimationRepeat(Animation animation) { if (!isStop) { duration -= 100; if (duration <= 230) { duration = 230; } } else { duration += 100; if (duration >= 500) { duration = 500; anim.setRepeatCount(1); } } anim.setDuration(duration); } });}/** * 刷新完毕 */public void refreshFinish() { isStop = true;}}
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