在项目开发中常常会遇到这种需求,自己写吧 水平不够,自定义view绘制不是太好.多番查找资料和网上百度以后,终于实现了效果,废话不说了,看代码.
import android.content.Context;
import android.graphics.Rect;
import android.support.annotation.Nullable;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.VelocityTracker;
import android.view.View;
import android.view.ViewConfiguration;
import android.view.ViewGroup;
import android.widget.Scroller;
/**
public class SlideRecyclerView extends RecyclerView {
private static final String TAG = "SlideRecyclerView";
private static final int INVALID_POSITION = -1; // 触摸到的点不在子View范围内
private static final int INVALID_CHILD_WIDTH = -1; // 子ItemView不含两个子View
private static final int SNAP_VELOCITY = 600; // 最小滑动速度
private VelocityTracker mVelocityTracker; // 速度追踪器
private int mTouchSlop; // 认为是滑动的最小距离(一般由系统提供)
private Rect mTouchFrame; // 子View所在的矩形范围
private Scroller mScroller;
private float mLastX; // 滑动过程中记录上次触碰点X
private float mFirstX, mFirstY; // 首次触碰范围
private boolean mIsSlide; // 是否滑动子View
private ViewGroup mFlingView; // 触碰的子View
private int mPosition; // 触碰的view的位置
private int mMenuViewWidth; // 菜单按钮宽度
public SlideRecyclerView(Context context) {
this(context, null);
}
public SlideRecyclerView(Context context, @Nullable AttributeSet attrs) {
this(context, attrs, 0);
}
public SlideRecyclerView(Context context, @Nullable AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
mScroller = new Scroller(context);
}
@Override
public boolean onInterceptTouchEvent(MotionEvent e) {
int x = (int) e.getX();
int y = (int) e.getY();
obtainVelocity(e);
switch (e.getAction()) {
case MotionEvent.ACTION_DOWN:
if (!mScroller.isFinished()) { // 如果动画还没停止,则立即终止动画
mScroller.abortAnimation();
}
mFirstX = mLastX = x;
mFirstY = y;
mPosition = pointToPosition(x, y); // 获取触碰点所在的position
if (mPosition != INVALID_POSITION) {
View view = mFlingView;
// 获取触碰点所在的view
mFlingView = (ViewGroup) getChildAt(mPosition - ((LinearLayoutManager) getLayoutManager()).findFirstVisibleItemPosition());
// 这里判断一下如果之前触碰的view已经打开,而当前碰到的view不是那个view则立即关闭之前的view,此处并不需要担动画没完成冲突,因为之前已经abortAnimation
if (view != null && mFlingView != view && view.getScrollX() != 0) {
view.scrollTo(0, 0);
}
// 这里进行了强制的要求,RecyclerView的子ViewGroup必须要有2个子view,这样菜单按钮才会有值,
// 需要注意的是:如果不定制RecyclerView的子View,则要求子View必须要有固定的width。
// 比如使用LinearLayout作为根布局,而content部分width已经是match_parent,此时如果菜单view用的是wrap_content,menu的宽度就会为0。
if (mFlingView.getChildCount() == 2) {
mMenuViewWidth = mFlingView.getChildAt(1).getWidth();
} else {
mMenuViewWidth = INVALID_CHILD_WIDTH;
}
}
break;
case MotionEvent.ACTION_MOVE:
mVelocityTracker.computeCurrentVelocity(1000);
// 此处有俩判断,满足其一则认为是侧滑:
// 1.如果x方向速度大于y方向速度,且大于最小速度限制;
// 2.如果x方向的侧滑距离大于y方向滑动距离,且x方向达到最小滑动距离;
float xVelocity = mVelocityTracker.getXVelocity();
float yVelocity = mVelocityTracker.getYVelocity();
if (Math.abs(xVelocity) > SNAP_VELOCITY && Math.abs(xVelocity) > Math.abs(yVelocity)
|| Math.abs(x - mFirstX) >= mTouchSlop
&& Math.abs(x - mFirstX) > Math.abs(y - mFirstY)) {
mIsSlide = true;
return true;
}
break;
case MotionEvent.ACTION_UP:
releaseVelocity();
break;
}
return super.onInterceptTouchEvent(e);
}
@Override
public boolean onTouchEvent(MotionEvent e) {
if (mIsSlide && mPosition != INVALID_POSITION) {
float x = e.getX();
obtainVelocity(e);
switch (e.getAction()) {
case MotionEvent.ACTION_DOWN: // 因为没有拦截,所以不会被调用到
break;
case MotionEvent.ACTION_MOVE:
// 随手指滑动
if (mMenuViewWidth != INVALID_CHILD_WIDTH) {
float dx = mLastX - x;
if (mFlingView.getScrollX() + dx <= mMenuViewWidth
&& mFlingView.getScrollX() + dx > 0) {
mFlingView.scrollBy((int) dx, 0);
}
mLastX = x;
}
break;
case MotionEvent.ACTION_UP:
if (mMenuViewWidth != INVALID_CHILD_WIDTH) {
int scrollX = mFlingView.getScrollX();
mVelocityTracker.computeCurrentVelocity(1000);
// 此处有两个原因决定是否打开菜单:
// 1.菜单被拉出宽度大于菜单宽度一半;
// 2.横向滑动速度大于最小滑动速度;
// 注意:之所以要小于负值,是因为向左滑则速度为负值
if (mVelocityTracker.getXVelocity() < -SNAP_VELOCITY) { // 向左侧滑达到侧滑最低速度,则打开
mScroller.startScroll(scrollX, 0, mMenuViewWidth - scrollX, 0, Math.abs(mMenuViewWidth - scrollX));
} else if (mVelocityTracker.getXVelocity() >= SNAP_VELOCITY) { // 向右侧滑达到侧滑最低速度,则关闭
mScroller.startScroll(scrollX, 0, -scrollX, 0, Math.abs(scrollX));
} else if (scrollX >= mMenuViewWidth / 2) { // 如果超过删除按钮一半,则打开
mScroller.startScroll(scrollX, 0, mMenuViewWidth - scrollX, 0, Math.abs(mMenuViewWidth - scrollX));
} else { // 其他情况则关闭
mScroller.startScroll(scrollX, 0, -scrollX, 0, Math.abs(scrollX));
}
invalidate();
}
mMenuViewWidth = INVALID_CHILD_WIDTH;
mIsSlide = false;
mPosition = INVALID_POSITION;
releaseVelocity(); // 这里之所以会调用,是因为如果前面拦截了,就不会执行ACTION_UP,需要在这里释放追踪
break;
}
return true;
} else {
// 此处防止RecyclerView正常滑动时,还有菜单未关闭
closeMenu();
// Velocity,这里的释放是防止RecyclerView正常拦截了,但是在onTouchEvent中却没有被释放;
// 有三种情况:1.onInterceptTouchEvent并未拦截,在onInterceptTouchEvent方法中,DOWN和UP一对获取和释放;
// 2.onInterceptTouchEvent拦截,DOWN获取,但事件不是被侧滑处理,需要在这里进行释放;
// 3.onInterceptTouchEvent拦截,DOWN获取,事件被侧滑处理,则在onTouchEvent的UP中释放。
releaseVelocity();
}
return super.onTouchEvent(e);
}
private void releaseVelocity() {
if (mVelocityTracker != null) {
mVelocityTracker.clear();
mVelocityTracker.recycle();
mVelocityTracker = null;
}
}
private void obtainVelocity(MotionEvent event) {
if (mVelocityTracker == null) {
mVelocityTracker = VelocityTracker.obtain();
}
mVelocityTracker.addMovement(event);
}
public int pointToPosition(int x, int y) {
int firstPosition = ((LinearLayoutManager) getLayoutManager()).findFirstVisibleItemPosition();
Rect frame = mTouchFrame;
if (frame == null) {
mTouchFrame = new Rect();
frame = mTouchFrame;
}
final int count = getChildCount();
for (int i = count - 1; i >= 0; i--) {
final View child = getChildAt(i);
if (child.getVisibility() == View.VISIBLE) {
child.getHitRect(frame);
if (frame.contains(x, y)) {
return firstPosition + i;
}
}
}
return INVALID_POSITION;
}
@Override
public void computeScroll() {
if (mScroller.computeScrollOffset()) {
mFlingView.scrollTo(mScroller.getCurrX(), mScroller.getCurrY());
invalidate();
}
}
/**
* 将显示子菜单的子view关闭
* 这里本身是要自己来实现的,但是由于不定制item,因此不好监听器点击事件,因此需要调用者手动的关闭
*/
public void closeMenu() {
if (mFlingView != null && mFlingView.getScrollX() != 0) {
mFlingView.scrollTo(0, 0);
}
}
}
我这里自己的包名: 到时改成你们自己的 不然肯定没反应
android:layout_width=“match_parent”
android:layout_height=“match_parent”>
import android.content.Context;
import android.graphics.Color;
import android.support.annotation.NonNull;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import com.example.haiyue.myapplication.R;
import com.example.haiyue.myapplication.bean.JianYiBean;
import java.util.ArrayList;
/**
public class JianYiAdapter extends RecyclerView.Adapter
private Context context;
private ArrayList list;
public JianYiAdapter(Context context, ArrayList list) {
this.context = context;
this.list = list;
}
@NonNull
@Override
public JianYiAdapter.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View view= LayoutInflater.from(context).inflate(R.layout.jianyiitem,parent,false);
ViewHolder holder=new ViewHolder(view);
return holder;
}
@Override
public void onBindViewHolder(@NonNull JianYiAdapter.ViewHolder holder, final int position) {
JianYiBean jianYiBean = list.get(position);
holder.title.setText(jianYiBean.getTitle());
holder.date.setText(jianYiBean.getDate());
if ("不予接收".equals(jianYiBean.getState())){
holder.state.setTextColor(Color.parseColor("#D52619"));
holder.state.setBackgroundResource(R.drawable.jianyi2);
holder.state.setText(jianYiBean.getState());
}
if ("办理失败".equals(jianYiBean.getState())){
holder.state.setTextColor(Color.parseColor("#D52619"));
holder.state.setBackgroundResource(R.drawable.jianyi2);
holder.state.setText(jianYiBean.getState());
}
holder.state.setText(jianYiBean.getState());
holder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (onClickListener!=null){
onClickListener.onClick(position);
}
}
});
}
public OnClickListener onClickListener;
public void setOnClickListener(OnClickListener onClickListener) {
this.onClickListener = onClickListener;
}
public interface OnClickListener{
void onClick(int position);
}
public void remove(int adapterPosition) {
list.remove(adapterPosition);
notifyItemRemoved(adapterPosition);
}
public void setTop(int adapterPosition) {
JianYiBean bean = list.get(adapterPosition);
list.remove(bean);
list.add(0, bean);
notifyItemMoved(adapterPosition, 0);
}
@Override
public int getItemCount() {
return list.size();
}
public class ViewHolder extends RecyclerView.ViewHolder {
TextView title,date,state;
public ViewHolder(View itemView) {
super(itemView);
title=itemView.findViewById(R.id.jianyi_title);
date=itemView.findViewById(R.id.jianyi_date);
state=itemView.findViewById(R.id.jianyi_commit);
}
}
}