自己实现一个右滑删除的ListView

参考了以下源码：https://github.com/baoyongzhang/SwipeMenuListView

实现的效果(顺便推荐一个视频转gif的网址：http://www.gif5.net/)

首先抛出几个问题：

1.如何根据我们的手势判定要左滑的position

2.滑动到什么程度让左滑的Menu显示出来

3.怎么处理item左滑与ListView的滑动的冲突

4.menu怎么添加

5.只能有一个是Open的状态，如果Item1是Open，这时候点击或者滑动Item2,应该使Item1关闭（拦截触摸事件，稍候详细添加）

首先，定义一个CustomSlideDeleteItemView，这个View的layout要重写，确定menu的摆放位置，具体见代码

package com.example.myapp.view;

import android.content.Context;
import android.content.res.TypedArray;
import android.util.AttributeSet;
import android.util.Log;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.FrameLayout;
import android.widget.LinearLayout;
import android.widget.TextView;

import com.example.myapp.R;
import com.example.myapp.util.Methods;

import java.util.ArrayList;
import java.util.List;

/**
 * Created by zyr
 * DATE: 16-3-19
 * Time: 下午3:54
 * Email: yanru.zhang@renren-inc.com
 */
public class CustomSlideDeleteItemView extends FrameLayout{
    private Context mContext;
    private List<View> menuViews = new ArrayList<>();
    private View contentView;
    private LinearLayout menuViewContainer;
    private int contentViewId;
    private int contentViewWidth,contentViewHeight,menuWidth,menuHeight;

    public boolean isMenuOpen() {
        return isMenuOpen;
    }

    private boolean isMenuOpen = false;

    public void setOnMenuClickListener(OnMenuClickListener onMenuClickListener) {
        this.onMenuClickListener = onMenuClickListener;
    }
    private OnMenuClickListener onMenuClickListener;

    public interface OnMenuClickListener{
        void onMenuClick(int i,int counts);
    }
    public CustomSlideDeleteItemView(Context context) {
        this(context, null);
    }

    public CustomSlideDeleteItemView(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public CustomSlideDeleteItemView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        mContext = context;
        menuWidth = Methods.computePixelsWithDensity(mContext,100);
        Log.d("zyr","menuWidth:" + menuWidth);
        TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.CustomSlideDeleteItemView);
        for(int i=0;i<typedArray.length();i++){
            int attr = typedArray.getIndex(i);
            switch (attr){
                case R.styleable.CustomSlideDeleteItemView_contentViewId:
                    contentViewId = typedArray.getResourceId(R.styleable.CustomSlideDeleteItemView_contentViewId,0);
                    break;
            }
        }
        if(contentViewId!=0){
            contentView = findViewById(contentViewId);
        }
        menuViewContainer = new LinearLayout(mContext);
        menuViewContainer.setOrientation(LinearLayout.HORIZONTAL);
        ViewGroup.LayoutParams layoutParams = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.MATCH_PARENT);
        addView(menuViewContainer, layoutParams);
    }

    @Override
    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
        super.onLayout(changed, left, top, right, bottom);
        if(contentView!=null){
            contentView.layout(0, 0, getMeasuredWidth(), getMeasuredHeight());
        }
        layoutMenu();
    }

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);
        if(w!=oldw || h!=oldh){
            contentViewHeight = menuHeight = h;
            contentViewWidth = w;
//            Log.d("zyr","contentViewWidth:" + contentViewWidth);
        }
    }

    public void addMenu(String s,int color){
        TextView textView = new TextView(mContext);
        textView.setText(s);
        textView.setBackgroundColor(color);
        textView.setTextColor(getResources().getColor(R.color.white));
        textView.setGravity(Gravity.CENTER);
        LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(menuWidth, ViewGroup.LayoutParams.MATCH_PARENT);
        menuViews.add(textView);
        menuViewContainer.addView(textView, layoutParams);
        invalidate();
        for(int i=0;i<menuViews.size();i++){
            final int position = i;
            View view = menuViews.get(i);
            view.setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View v) {
                    if(onMenuClickListener!=null){
                        onMenuClickListener.onMenuClick(position,menuViews.size());
                        scrollBack();
                    }
                }
            });
        }
    }

    public void clearAllMenu(){
        menuViews.clear();
        menuViewContainer.removeAllViews();
        invalidate();
    }

    private void layoutMenu() {
        menuViewContainer.layout(contentViewWidth, 0, contentViewWidth + menuWidth * menuViews.size(), contentViewHeight);
    }

    public void scroll(int deltaX,int lastDeltaX) {
        if(deltaX < 0){
            Log.d("zyr","deltaX:" + deltaX);
            Log.e("zyr","menuWidth * menuViews.size():" + menuWidth * menuViews.size());

            if(Math.abs(deltaX) > menuWidth * menuViews.size() ){
                scrollTo(menuWidth * menuViews.size(), 0);
                isMenuOpen = true;
            }else{
                scrollBy(-lastDeltaX, 0);
            }
        }else{
            if(isMenuOpen()){
                Log.d("zyr","deltaX:" + deltaX);
                Log.e("zyr", "menuWidth * menuViews.size():" + menuWidth * menuViews.size());

                if(Math.abs(deltaX) > menuWidth * menuViews.size()){
                    scrollTo(0,0);
                    isMenuOpen = false;
                }else{
                    scrollBy(-lastDeltaX, 0);
                }
            }
        }
    }

    public void autoScroll(int deltaX){
        if(deltaX < 0){
            if(Math.abs(deltaX) < menuWidth){
                scrollTo(0, 0);
                isMenuOpen = false;
            }else{
                scrollTo(menuWidth * menuViews.size(), 0);
                isMenuOpen = true;
            }
        }else{
            if(isMenuOpen()){
                if(Math.abs(deltaX) < menuWidth){
                    scrollTo(menuWidth * menuViews.size(), 0);
                    isMenuOpen = true;
                }else{
                    scrollTo(0,0);
                    isMenuOpen = false;
                }
            }
        }
    }

    public void scrollBack(){
        scrollTo(0,0);
        isMenuOpen = false;
    }
}

在attr文件中定义

<declare-styleable name="CustomSlideDeleteItemView">
        <attr name="contentViewId" format="integer"/>
    </declare-styleable>

然后定义我们的CustomSlideDeleteListView

package com.example.myapp.view;

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.widget.ListView;

import com.example.myapp.R;

/**
 * Created by zyr
 * DATE: 16-3-18
 * Time: 下午5:42
 * Email: yanru.zhang@renren-inc.com
 */
public class CustomSlideDeleteListView extends ListView {
    private Context mContext;
    private CustomSlideDeleteItemView mCurrentView;
    private int currentItemId;
    private int downX,downY,moveX,moveY,deltaX,deltaY,upX,upY,lastX,lastDeltaX;
    public final static int MIN_SCROLL_DIS = 100;
    public CustomSlideDeleteListView(Context context) {
        this(context, null);
    }

    public CustomSlideDeleteListView(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public CustomSlideDeleteListView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        mContext = context;
        setSelector(new ColorDrawable(Color.TRANSPARENT));
        TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.CustomSlideDeleteListView);
        for(int i=0;i<typedArray.length();i++){
            int attr = typedArray.getIndex(i);
            switch (attr){
                case R.styleable.CustomSlideDeleteListView_rightViewId:

                    break;
            }
        }
    }

    @Override
    public boolean onTouchEvent(MotionEvent ev) {
        switch (ev.getAction()){
            case MotionEvent.ACTION_DOWN:
                lastX = downX = (int) ev.getX();
                downY = (int) ev.getY();
                currentItemId = pointToPosition(downX, downY);
                mCurrentView = (CustomSlideDeleteItemView)getChildAt(currentItemId - getFirstVisiblePosition());
//                Log.e("zyr","currentItemId:" + currentItemId);
                break;
            case MotionEvent.ACTION_MOVE:
                /**还要区分上下滑动listview的时候**/
                moveX = (int) ev.getX();
                moveY = (int) ev.getY();
                deltaX = moveX - downX;
                deltaY = moveY - downY;
                if(Math.abs(deltaX) > Math.abs(deltaY)){
                    lastDeltaX = moveX - lastX;
                    lastX = moveX;
//                Log.d("zyr","deltaX:" + deltaX);
//                Log.e("zyr","canShowRightView " + canShowRightView);
                    if(Math.abs(deltaX) > MIN_SCROLL_DIS && mCurrentView!=null){
                        mCurrentView.scroll(deltaX,lastDeltaX);
                        return true;
                    }
                }
                break;
            case MotionEvent.ACTION_UP:
            case MotionEvent.ACTION_CANCEL:
                upX = (int)ev.getX();
                upY = (int)ev.getY();
                if(mCurrentView!=null && Math.abs(upX-downX) > MIN_SCROLL_DIS){
                    mCurrentView.autoScroll(upX-downX);
                }
                break;
        }
        return super.onTouchEvent(ev);
    }
}

最后需要定义我们的Adapter

package com.example.myapp.adapter;

import android.content.Context;
import android.graphics.Color;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Filter;
import android.widget.Filterable;
import android.widget.TextView;
import android.widget.Toast;

import com.example.myapp.R;
import com.example.myapp.view.CustomSlideDeleteItemView;

import java.util.ArrayList;
import java.util.List;

/**
 * Created by zyr
 * DATE: 15-11-26
 * Time: 下午2:52
 * Email: yanru.zhang@renren-inc.com
 */
public class CustomSlideDeleteListViewAdapter extends BaseAdapter implements Filterable{
    public List<String> arrayList = new ArrayList<String>();
    private Context context;
    private MyFilter mFilter;

    public CustomSlideDeleteListViewAdapter(Context context){
        this.context = context;
    }
    public CustomSlideDeleteListViewAdapter(Context context, List<String> arrayList){
        this.context = context;
        this.arrayList = new ArrayList<String>(arrayList);
    }

    public void setData(List<String> array){
        if(array ==null){
            return;
        }
        arrayList = new ArrayList<String>(array);
        notifyDataSetChanged();
    }
    @Override
    public int getCount() {
        return arrayList.size();
    }

    @Override
    public Object getItem(int position) {
        return arrayList.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(final int position, View convertView, ViewGroup parent) {
        ViewHolder viewHolder = null;
        if(convertView ==null){
            convertView = LayoutInflater.from(context).inflate(R.layout.list_view_item,null);
            viewHolder = new ViewHolder(convertView);
            convertView.setTag(viewHolder);
        }else{
            viewHolder = (ViewHolder)convertView.getTag();
        }
        viewHolder.itemView.clearAllMenu();
        viewHolder.itemView.addMenu("Delete", Color.RED);
        viewHolder.itemView.addMenu("Open", Color.BLUE);
        viewHolder.itemView.scrollBack();
        viewHolder.textView.setText(arrayList.get(position));
        viewHolder.itemView.setOnMenuClickListener(new CustomSlideDeleteItemView.OnMenuClickListener() {
            @Override
            public void onMenuClick(int i, int counts) {
                switch (i){
                    case 0:
                        arrayList.remove(position);
                        notifyDataSetChanged();
                        break;
                    case 1:
                        break;
                }

            }
        });
        return convertView;
    }

    @Override
    public Filter getFilter() {
        if (mFilter == null) {
            mFilter = new MyFilter();
        }
        return mFilter;
    }
    class MyFilter extends Filter {

        @Override
        protected FilterResults performFiltering(CharSequence constraint) {
            FilterResults results = new FilterResults();
            if (arrayList == null) {
                arrayList = new ArrayList<String>();
            }
            results.values = arrayList;
            results.count = arrayList.size();
            return results;
        }

        @Override
        protected void publishResults(CharSequence constraint, FilterResults results) {
            if (results.count > 0) {
                notifyDataSetChanged();
            } else {
                notifyDataSetInvalidated();
            }
        }
    }

    class ViewHolder{
        CustomSlideDeleteItemView itemView;
        TextView textView;
        public ViewHolder(View view){
            itemView = (CustomSlideDeleteItemView)view;
            textView = (TextView)view.findViewById(R.id.list_view_text);
        }
    }
}

adapter引用的xml文件

<?xml version="1.0" encoding="utf-8"?>
<com.example.myapp.view.CustomSlideDeleteItemView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:background="@drawable/common_listview_bg"
    app:contentViewId="@+id/list_view_text">
    <TextView android:id="@+id/list_view_text"
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:gravity="center"
        android:textColor="@color/primary"
        android:textStyle="bold"
        android:paddingLeft="20dp" />
</com.example.myapp.view.CustomSlideDeleteItemView>

在Activity中引用

  customSlideDeleteListView = (CustomSlideDeleteListView) findViewById(R.id.custom_slid_delete_list_view);
        for(int i=0;i<100;i++){
            stringList.add("zyr" + i);
        }
        customSlideDeleteListViewAdapter = new CustomSlideDeleteListViewAdapter(this,stringList);
        customSlideDeleteListView.setAdapter(customSlideDeleteListViewAdapter);