Android 用HorizontalScrollView实现ListView的Item滑动删除 ，滑动错乱 冲突

时间：2023-03-08 19:02:08
用HorizontalScrollView实现类似微信的滑动删除

测试于：Android2.2+

对于Android来说按键操作已经在减少，越来越多的手势操作层出不穷，今天介绍一款LIstView的Item滑动删除的实现方式。

原理：

利用HorizontalScrollView可以横向滚动的特点实现滑动，根据动态的设置要展示的区域宽度，使得其余选项操作被挤出屏幕外面，从而实现单条滑动菜单的样式。

实现步骤：

  1. 实现Listview的Item布局文件item_list.layout 
    <?xml version="1.0" encoding="utf-8"?>
    
<HorizontalScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    
    android:id="@+id/hsv"
    
    android:layout_width="wrap_content"
    
    android:layout_height="80dip"
    
    android:scrollbars="none" >

    <LinearLayout
    
        android:layout_width="wrap_content"
    
        android:layout_height="match_parent"
    
        android:orientation="horizontal" >

        <LinearLayout
    
            android:id="@+id/ll_content"
    
            android:layout_width="match_parent"
    
            android:layout_height="match_parent" >

            <TextView
    
                android:id="@+id/tv"
    
                android:layout_width="match_parent"
    
                android:layout_height="match_parent"
    
                android:gravity="center"
    
                android:text="" />
    
        </LinearLayout>

        <LinearLayout
    
            android:id="@+id/ll_action"
    
            android:layout_width="wrap_content"
    
            android:layout_height="match_parent"
    
            android:orientation="horizontal" >

            <Button
    
                android:id="@+id/button1"
    
                android:layout_width="wrap_content"
    
                android:layout_height="match_parent"
    
                android:background="@android:color/darker_gray"
    
                android:paddingLeft="20dip"
    
                android:paddingRight="20dip"
    
                android:text="@string/action1" />

            <Button
    
                android:id="@+id/button2"
    
                android:layout_width="wrap_content"
    
                android:layout_height="match_parent"
    
                android:layout_marginLeft="2dip"
    
                android:layout_marginRight="2dip"
    
                android:background="@android:color/darker_gray"
    
                android:paddingLeft="20dip"
    
                android:paddingRight="20dip"
    
                android:text="@string/action2" />

            <Button
    
                android:id="@+id/button3"
    
                android:layout_width="wrap_content"
    
                android:layout_height="match_parent"
    
                android:background="@android:color/darker_gray"
    
                android:paddingLeft="20dip"
    
                android:paddingRight="20dip"
    
                android:text="@string/action3" />
    
        </LinearLayout>
    
    </LinearLayout>

</HorizontalScrollView>
  2. 准备MainActivity初始化Listview 
    package com.yzy.horizontalscrollview;

import android.app.Activity;
    
import android.os.Bundle;
    
import android.util.DisplayMetrics;
    
import android.widget.ListView;
    
import com.yzy.horizontalscrollview.R;

public class MainActivity extends Activity {

    private ListView mListView;

    private MyAdapter mAdapter;

    @Override
    
    protected void onCreate(Bundle savedInstanceState) {
    
        super.onCreate(savedInstanceState);
    
        setContentView(R.layout.activity_main);
    
        mListView = (ListView) findViewById(R.id.listView);
    
        DisplayMetrics dm = new DisplayMetrics();
    
        getWindowManager().getDefaultDisplay().getMetrics(dm);
    
        mAdapter = new MyAdapter(this, dm.widthPixels);
    
        mListView.setAdapter(mAdapter);
    
    }
    
}
  3. 继承BaseAdapter实现自定义的适配器MyAdapter 
    package com.yzy.horizontalscrollview;

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

import android.content.Context;
    
import android.view.LayoutInflater;
    
import android.view.MotionEvent;
    
import android.view.View;
    
import android.view.ViewGroup;
    
import android.view.ViewGroup.LayoutParams;
    
import android.widget.BaseAdapter;
    
import android.widget.Button;
    
import android.widget.HorizontalScrollView;
    
import android.widget.TextView;
    
import com.yzy.horizontalscrollview.R;

public class MyAdapter extends BaseAdapter implements View.OnClickListener {
    
    // 数据源，用于存放颜色值的。
    
    private List<Integer> colors;
    
    private Context mContext;
    
    // 屏幕宽度,由于我们用的是HorizontalScrollView,所以按钮选项应该在屏幕外
    
    private int mScreentWidth;
    
    private View view;

    /**
    
     * 构造方法
    
     *
    
     * @param context
    
     * @param screenWidth
    
     */
    
    public MyAdapter(Context context, int screenWidth) {

        // 初始化
    
        mContext = context;
    
        mScreentWidth = screenWidth;

        // 填充list的内容模拟数据，否则应该异步执行
    
        colors = new ArrayList<Integer>();
    
        for (int i = 0; i < 15; i++) {
    
            colors.add(R.color.blue);
    
        }
    
    }

    @Override
    
    public int getCount() {
    
        return colors.size();
    
    }

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

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

    @Override
    
    public View getView(int position, View convertView, ViewGroup parent) {
    
        ViewHolder holder;
    
        // 如果没有设置过,初始化convertView
    
        if (convertView == null) {
    
            // 获得设置的view
    
            convertView = LayoutInflater.from(mContext).inflate(R.layout.item_list, parent, false);

            // 初始化holder
    
            holder = new ViewHolder();
    
            holder.hSView = (HorizontalScrollView) convertView.findViewById(R.id.hsv);

            holder.action = convertView.findViewById(R.id.ll_action);
    
            holder.btOne = (Button) convertView.findViewById(R.id.button1);
    
            holder.btTwo = (Button) convertView.findViewById(R.id.button2);
    
            holder.btThree = (Button) convertView.findViewById(R.id.button3);
    
            holder.tvContent = (TextView) convertView.findViewById(R.id.tv);

            // 设置内容view的大小为屏幕宽度,这样按钮就正好被挤出屏幕外
    
            holder.content = convertView.findViewById(R.id.ll_content);
    
            LayoutParams lp = holder.content.getLayoutParams();
    
            lp.width = mScreentWidth;

            convertView.setTag(holder);
    
        } else {
    
            // 有直接获得ViewHolder
    
            holder = (ViewHolder) convertView.getTag();
    
        }
    
        // 把位置放到view中,这样点击事件就可以知道点击的是哪一条item
    
        holder.btOne.setTag(position);
    
        holder.btTwo.setTag(position);
    
        holder.btThree.setTag(position);

        // 设置监听事件
    
        convertView.setOnTouchListener(new View.OnTouchListener()
    
        {
    
            @Override
    
            public boolean onTouch(View v, MotionEvent event)
    
            {
    
                switch (event.getAction())
    
                {
    
                    case MotionEvent.ACTION_DOWN:
    
                        if (view != null) {
    
                            ViewHolder viewHolder1 = (ViewHolder) view.getTag();
    
                            viewHolder1.hSView.smoothScrollTo(0, 0);
    
                        }
    
                    case MotionEvent.ACTION_UP:
    
                        // 获得ViewHolder
    
                        ViewHolder viewHolder = (ViewHolder) v.getTag();
    
                        view = v;
    
                        // 获得HorizontalScrollView滑动的水平方向值.
    
                        int scrollX = viewHolder.hSView.getScrollX();

                        // 获得操作区域的长度
    
                        int actionW = viewHolder.action.getWidth();

                        // 注意使用smoothScrollTo,这样效果看起来比较圆滑,不生硬
    
                        // 如果水平方向的移动值<操作区域的长度的一半,就复原
    
                        if (scrollX < actionW / 2)
    
                        {
    
                            viewHolder.hSView.smoothScrollTo(0, 0);
    
                        }
    
                        else// 否则的话显示操作区域
    
                        {
    
                            viewHolder.hSView.smoothScrollTo(actionW, 0);
    
                        }
    
                        return true;
    
                }
    
                return false;
    
            }
    
        });

        // 这里防止删除一条item后,ListView处于操作状态,直接还原
    
        if (holder.hSView.getScrollX() != 0) {
    
            holder.hSView.scrollTo(0, 0);
    
        }

        // 设置背景颜色,设置填充内容.
    
        holder.content.setBackgroundResource(colors.get(position));
    
        holder.tvContent.setText("" + position);

        // 设置监听事件
    
        holder.btOne.setOnClickListener(this);
    
        holder.btTwo.setOnClickListener(this);
    
        holder.btThree.setOnClickListener(this);

        return convertView;
    
    }

    /**
    
     * ViewHolder
    
     *
    
     * @Title:
    
     * @Description:主要是避免了不断的view获取初始化.
    
     * @Author:yzy
    
     * @Since:2013-10-22
    
     */
    
    class ViewHolder {
    
        public HorizontalScrollView hSView;

        public View content;
    
        public TextView tvContent;

        public View action;
    
        public Button btOne;
    
        public Button btTwo;
    
        public Button btThree;
    
    }

    @Override
    
    public void onClick(View v) {
    
        int position = (Integer) v.getTag();
    
        switch (v.getId()) {
    
            case R.id.button1:
    
                colors.add(R.color.blue);
    
                break;
    
            case R.id.button2:
    
                colors.remove(position);
    
                break;
    
            case R.id.button3:
    
                if (colors.get(position) == R.color.blue) {
    
                    colors.set(position, R.color.red);
    
                } else {
    
                    colors.set(position, R.color.blue);
    
                }
    
                break;

            default:
    
                break;
    
        }
    
        // 刷新ListView内容
    
        notifyDataSetChanged();
    
    }
    
}

效果图：

Android 用HorizontalScrollView实现ListView的Item滑动删除 ，滑动错乱 冲突

还有很多的实现方式，希望大家多多指教哦，附件里面是源码本人测试通过的。

下载：ListViewHorizontalScrollview.zip

最近在开发中遇到HorizontalScrollView嵌套ScrollView导致滑动卡的情况，急横向水平滑动的View和垂直水平滑动的View，都在接收处理滑动时间，但是这种情况下触摸事件就会发生冲突。导致滑动非常卡，甚至出现程序停止响应。这种情况下我们需要重写view。下面是两个简单的例子，重写水平滑动View只接收水平方向上滑动的事件。我们使用手势GestureDetector来作区分

import android.content.Context;

import android.util.AttributeSet;

import android.view.GestureDetector;

import android.view.GestureDetector.SimpleOnGestureListener;

import android.view.MotionEvent;

import android.view.View;

import android.widget.HorizontalScrollView;

public class CustomHScrollView extends HorizontalScrollView{

    private GestureDetector mGestureDetector;

    private View.OnTouchListener mGestureListener;

    private static final String TAG = "CustomHScrollView";

    /**

     * @function CustomHScrollView constructor

     * @param context Interface to global information about an application environment.

     *

     */

    public CustomHScrollView(Context context) {

        super(context);

// TODO Auto-generated constructor stub

        mGestureDetector = new GestureDetector(new HScrollDetector());

        setFadingEdgeLength(0);

    }

    /**

     * @function CustomHScrollView constructor

     * @param context Interface to global information about an application environment.

     * @param attrs A collection of attributes, as found associated with a tag in an XML document.

     */

    public CustomHScrollView(Context context, AttributeSet attrs) {

        super(context, attrs);

// TODO Auto-generated constructor stub

        mGestureDetector = new GestureDetector(new HScrollDetector());

        setFadingEdgeLength(0);

    }

    /**

     * @function CustomHScrollView constructor

     * @param context Interface to global information about an application environment.

     * @param attrs A collection of attributes, as found associated with a tag in an XML document.

     * @param defStyle style of view

     */

    public CustomHScrollView(Context context, AttributeSet attrs,

                             int defStyle) {

        super(context, attrs, defStyle);

// TODO Auto-generated constructor stub

        mGestureDetector = new GestureDetector(new HScrollDetector());

        setFadingEdgeLength(0);

    }

    @Override

    public boolean onInterceptTouchEvent(MotionEvent ev) {

        return super.onInterceptTouchEvent(ev) && mGestureDetector.onTouchEvent(ev);

    }

    // Return false if we're scrolling in the y direction

    class HScrollDetector extends SimpleOnGestureListener {

        @Override

        public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {

            if(Math.abs(distanceX) > Math.abs(distanceY)) {

                return true;

            }

            return false;

        }

    }

}
       

相关文章