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;
}
}
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