package com.example.listsildedel;import java.util.ArrayList;import java.util.List;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.widget.ListView;public class MainActivity extends Activity { private ListView mListView; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mListView = (ListView) this.findViewById(R.id.list); List<String> list = new ArrayList<String>(); for(int i=0;i<10;i++){ list.add("选项"+i); } //实例化自定义内容适配类 MyAdapter adapter = new MyAdapter(this, this,list); //为listView设置适配 mListView.setAdapter(adapter); } public void openActivity(){ Intent intent = new Intent(this, TestActivity.class); startActivity(intent); } }adapter
package com.example.listsildedel;import java.util.List;import android.content.Context;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.TextView;public class MyAdapter extends BaseAdapter { private List<String> arrays = null; private Context mContext; private Button curDel_btn; private float x,ux; private MainActivity mActivity; public MyAdapter(MainActivity activity, Context mContext, List<String> arrays) { this.mContext = mContext; this.arrays = arrays; mActivity = activity; } public int getCount() { return this.arrays.size(); } public Object getItem(int position) { return null; } public long getItemId(int position) { return position; } public View getView(final int position, View view, ViewGroup arg2) { ViewHolder viewHolder = null; if (view == null) { viewHolder = new ViewHolder(); view = LayoutInflater.from(mContext).inflate(R.layout.item, null); viewHolder.tvTitle = (TextView) view.findViewById(R.id.title); viewHolder.btnDel = (Button) view.findViewById(R.id.del); view.setTag(viewHolder); } else { viewHolder = (ViewHolder) view.getTag(); } //换掉了原来listview中的onItemClick <span style="font-size:18px;"><strong>view.setOnClickListener(new OnClickListener() { public void onClick(View v) { // TODO Auto-generated method stub mActivity.openActivity(); } });</strong></span> //为每一个view项设置触控监听 view.setOnTouchListener(new OnTouchListener() { public boolean onTouch(View v, MotionEvent event) { final ViewHolder holder = (ViewHolder) v.getTag(); //当按下时处理 if (event.getAction() == MotionEvent.ACTION_DOWN) { // //设置背景为选中状态// v.setBackgroundResource(R.drawable.mm_listitem_pressed); //获取按下时的x轴坐标 x = event.getX(); //判断之前是否出现了删除按钮如果存在就隐藏 if (curDel_btn != null) { if(curDel_btn.getVisibility() == View.VISIBLE){ curDel_btn.setVisibility(View.GONE); return true; } } } else if (event.getAction() == MotionEvent.ACTION_UP) {// 松开处理 //设置背景为未选中正常状态 //v.setBackgroundResource(R.drawable.mm_listitem_simple); //获取松开时的x坐标 ux = event.getX(); //判断当前项中按钮控件不为空时 if (holder.btnDel != null) { //按下和松开绝对值差当大于20时显示删除按钮，否则不显示 if (Math.abs(x - ux) > 20) { holder.btnDel.setVisibility(View.VISIBLE); curDel_btn = holder.btnDel; return true; } } } else if (event.getAction() == MotionEvent.ACTION_MOVE) {//当滑动时背景为选中状态 return true; //v.setBackgroundResource(R.drawable.mm_listitem_pressed); } else {//其他模式 //设置背景为未选中正常状态 //v.setBackgroundResource(R.drawable.mm_listitem_simple); } return false; } }); viewHolder.tvTitle.setText(this.arrays.get(position)); //为删除按钮添加监听事件，实现点击删除按钮时删除该项 viewHolder.btnDel.setOnClickListener(new OnClickListener() { public void onClick(View v) { if(curDel_btn!=null) curDel_btn.setVisibility(View.GONE); arrays.remove(position); notifyDataSetChanged(); } }); return view; } final static class ViewHolder { TextView tvTitle; Button btnDel; }}
