模拟手机QQ滑动删除消息

package com.example.srolltest;

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

import android.app.Activity;
import android.os.Bundle;
import android.util.DisplayMetrics;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnTouchListener;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.HorizontalScrollView;
import android.widget.ListView;
import android.widget.TextView;

public class MainActivity extends Activity {
    private ListView listView;
    private Myadapter adapter;
    private List<String> datas;
    private int screenWidth;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        listView = (ListView) findViewById(R.id.listView);
        DisplayMetrics outMetrics = new DisplayMetrics();
        getWindowManager().getDefaultDisplay().getMetrics(outMetrics);
        screenWidth = outMetrics.widthPixels;
        initDatas();
        adapter = new Myadapter();
        listView.setAdapter(adapter);

    }

    private void initDatas() {
        // TODO Auto-generated method stub
        datas = new ArrayList<String>();
        for (int i = 0; i < 20; i++) {
            datas.add("删除我吧,删除我吧" + i);
        }
    }

    class Myadapter extends BaseAdapter {

        @Override
        public int getCount() {
            // TODO Auto-generated method stub
            return datas.size();
        }

        @Override
        public Object getItem(int position) {
            // TODO Auto-generated method stub
            return datas.get(position);
        }

        @Override
        public long getItemId(int position) {
            // TODO Auto-generated method stub
            return position;
        }

        @Override
        public View getView(final int position, View convertView, ViewGroup parent) {
            // TODO Auto-generated method stub
            final ViewHolder viewHolder;
            if (convertView == null) {
                convertView = LayoutInflater.from(MainActivity.this).inflate(
                        R.layout.item_main, null);
                viewHolder = new ViewHolder();
                viewHolder.horizontalScrollView = (HorizontalScrollView) convertView.findViewById(R.id.horizontalScrollView);
                viewHolder.tvContexTextView = (TextView) convertView.findViewById(R.id.tv_context);
                viewHolder.btnDelete = (Button) convertView.findViewById(R.id.btn_delete);
                viewHolder.toTop = (Button) convertView.findViewById(R.id.btn_toTop);
                convertView.setTag(viewHolder);
            } else {
                viewHolder = (ViewHolder) convertView.getTag();
            }
            viewHolder.tvContexTextView.setText(datas.get(position));
            viewHolder.tvContexTextView.setWidth(screenWidth);
            if (viewHolder.horizontalScrollView.getScrollX() > 0) {
                viewHolder.horizontalScrollView.smoothScrollTo(0, 0);
            }
            convertView.setOnTouchListener(new OnTouchListener() {
                
                @Override
                public boolean onTouch(View v, MotionEvent event) {
                    switch (event.getAction()) {
                    case MotionEvent.ACTION_UP:
                        int actionWidth = viewHolder.btnDelete.getWidth()+viewHolder.toTop.getWidth();
                        int scrollX =viewHolder.horizontalScrollView.getScrollX();
                        if(scrollX>actionWidth/2){
                            viewHolder.horizontalScrollView.smoothScrollTo(actionWidth, 0);
                        }else {
                            viewHolder.horizontalScrollView.smoothScrollTo(0, 0);
                        }
                        return true;
                    }
                    return false;
                }
            });
            viewHolder.tvContexTextView.setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View v) {
                    // TODO Auto-generated method stub
                    notifyDataSetChanged();
                }
            });
            viewHolder.btnDelete.setOnClickListener(new OnClickListener() {
                
                @Override
                public void onClick(View v) {
                    datas.remove(position);
                    notifyDataSetChanged();
                }
            });
            viewHolder.toTop.setOnClickListener(new OnClickListener() {
                
                @Override
                public void onClick(View v) {
                    String temp = datas.get(0);
                    datas.set(0, datas.get(position));
                    datas.set(position, temp);
                    notifyDataSetChanged();
                    
                }
            });
            return convertView;
        }

        class ViewHolder {
            HorizontalScrollView horizontalScrollView;
            TextView tvContexTextView;
            Button btnDelete;
            Button toTop;
        }
    }
}

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <ListView
        android:id="@+id/listView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:fastScrollEnabled="true" />

</LinearLayout>

item_main.xml

<?xml version="1.0" encoding="utf-8"?>
<HorizontalScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/horizontalScrollView"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#8492B4"
    android:scrollbars="none" >

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

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

        <Button
            android:id="@+id/btn_delete"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:background="#33ff0000"
            android:text="删除" />

        <Button
            android:id="@+id/btn_toTop"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:background="#3300ff00"
            android:text="置顶" />
    </LinearLayout>

</HorizontalScrollView>