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ListView点击删除按钮,总是删除最后一个

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悬赏园豆:20 [待解决问题]

实现了一个listview,向左滑动会出现删除的按钮,下面是向左滑动后出现的效果:

 这个时候我如果点击第一个删除设备的按钮,它会删除最后一个设备,继续点第一个删除按钮,会删除倒数第二个,总之就是删除最下面的一个,是什么原因引起的呢,望大神解答一下.

我的源码是这样的(因为调试,写的有点乱):

package com.example.realandriod;

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

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
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.view.animation.AnimationUtils;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;

public class DeviceListActivity extends Activity {

    // 设备的信息应该从数据库中获取而来,此种写法不妥
    private String[] devicename = { "设备1", "设备2", "设备3", "设备4" };
    private int[] imagepath = { R.drawable.device1, R.drawable.device2,
            R.drawable.device3, R.drawable.device4 };
    private List<Itemcontent> mData;
    // ArrayList<Itemcontent> mData = new ArrayList<Itemcontent>();
    DraggableListView mListView = null;
    DeviceListActivity arrayList = null;
    MyListAdapter myAdapter = null;
    ArrayList<String> listString;

    public final class viewHolder1 {
        ImageView mimageView;
        TextView mtextView;
        Button mbutton;
    }

    public final class viewHolder2 {
        ImageView mimageView;
    }

    // private ArrayList<Object> array = null;

    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_device_list);

        // //这里的代码不够严谨,待改
        // listString = new ArrayList<String>();
        // for (int i = 0; i < 9; i++) {
        // listString.add(Integer.toString(i));
        // }
        mData = new ArrayList<Itemcontent>();
        for (int i = 0; i < devicename.length; i++) {
            mData.add(new Itemcontent(imagepath[i], devicename[i]));
        }

        mListView = (DraggableListView) findViewById(R.id.ListView);
        // myAdapter = new MyListAdapter(this, R.layout.activity_device_apt);
        myAdapter = new MyListAdapter(this, mData);
        mListView.setAdapter(myAdapter);

    }

    public class MyListAdapter extends BaseAdapter {
        int mTextViewResourceID = 0;
        private Context mContext;
        final int TYPE_1 = 0;
        final int TYPE_2 = 1;
        private LayoutInflater inflater;
        private float upX, downX;
        private List<Itemcontent> data;

        public MyListAdapter(Context context, List<Itemcontent> data) {
            this.mContext = context;
            //inflater = LayoutInflater.from(mContext);
            this.data = data;
        }

        public int getCount() {
            // System.out.println("当前的size是 "+data.size());
            return this.data.size();
        }

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

        // 每加载一个listItem就调用一次getView()
        public View getView(final int position, View convertView,
                ViewGroup parent) {
            final View mView;
            int type = getItemViewType(position);
            // View row = convertView;
            final viewHolder1 holder1;
            final viewHolder2 holder2;

            if (convertView == null) {
                switch (type) {
                case TYPE_1:
                    System.out.println("是正常条目,序号是 " + position);
//                    mView = inflater
//                            .inflate(R.layout.activity_device_apt, null);
                    mView = LayoutInflater.from(this.mContext).inflate(R.layout.activity_device_apt, parent, false) ; // 查找布局文件Layout

                    holder1 = new viewHolder1();
                    holder1.mimageView = (ImageView) mView
                            .findViewById(R.id.image);
                    holder1.mbutton = (Button) mView
                            .findViewById(R.id.item_delete);

                    holder1.mimageView.setImageResource(this.data.get(position)
                            .getPath());
                    holder1.mtextView = (TextView) mView
                            .findViewById(R.id.device);
                    holder1.mtextView.setText(this.data.get(position).getName());
                    mView.setTag(holder1);
                    holder1.mbutton.setOnClickListener(new OnClickListener() {
                        @Override
                        public void onClick(View v) {
                            System.out.println("移除的元素是 "
                                    + data.get(position).getName());
                            data.remove(position);
                            notifyDataSetChanged();
                        }
                    });

                    // 滑动显示删除按钮
                    mView.setOnTouchListener(new OnTouchListener() {
                        @Override
                        public boolean onTouch(View v, MotionEvent event) {
                            if (event.getAction() == MotionEvent.ACTION_DOWN) {
                                downX = event.getX();
                            } else if (event.getAction() == MotionEvent.ACTION_MOVE) {
                                upX = event.getX(event.getPointerCount() - 1);
                                if (downX - upX > 50) {
                                    mView.startAnimation(AnimationUtils
                                            .loadAnimation(mContext,
                                                    R.anim.move));
                                    holder1.mbutton.setVisibility(View.VISIBLE);
                                } else if (upX - downX > 50) {
                                    mView.startAnimation(AnimationUtils
                                            .loadAnimation(mContext,
                                                    R.anim.move2));
                                    holder1.mbutton.setVisibility(View.GONE);
                                }
                            }

                            return true;
                        }
                    });
                    break;
                    //return mView;
                case TYPE_2:
                    System.out.println("是添加条目,序号是 " + position);
//                    mView = inflater.inflate(R.layout.activity_device_addslot,
//                            parent, false);
                    mView = LayoutInflater.from(this.mContext).inflate(R.layout.activity_device_addslot, parent, false);
                    holder2 = new viewHolder2();
                    holder2.mimageView = (ImageView) mView
                            .findViewById(R.id.device_addslot);
                    holder2.mimageView.setImageResource(R.drawable.add_device);
                    mView.setTag(holder2);
                    //return mView;
                    break;
                default:
                    mView = LayoutInflater.from(this.mContext).inflate(R.layout.activity_device_apt, null);
                    return mView;
                }
            }else{
                System.out.println("调用了else语句");
                return convertView;
            }
            return mView;
        }

        /*
         * @return TYPE_1:正常的item数据 TYPE_2:最后一个元素“+”号
         */
        public int getItemViewType(int position) {
            // TODO Auto-generated method stub
            if (position != 4) {
                return TYPE_1;
            } else {
                return TYPE_2;
            }
        }

        /*
         * @return 返回item的类型有多少种
         */
        public int getViewTypeCount() {
            // TODO Auto-generated method stub
            return 2;
        }

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

    public void buttonClick(View v) {
        switch (v.getId()) {
        case R.id.device_addslot:
            startActivity(new Intent(DeviceListActivity.this,
                    DeviceAddActivity.class));
            break;
        }
    }
}

上面之所以要有一个type,是因为我想在不同的type的时候加载不同类型的布局,但是现在我已经把TYPE_2的元素给去了,所以图中的布局都是一样的,现在case TYPE_2没有使用可以忽略。

菜鸟的梦醒的主页 菜鸟的梦醒 | 初学一级 | 园豆:71
提问于:2014-12-31 09:53
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所有回答(2)
0

我猜是不是集合的元素下标从0开始的,但是你传进去的position始终比下标大1啊,要不你再看看?

醉心 | 园豆:99 (初学一级) | 2014-12-31 10:03

不是的,我每次删除的时候会执行

System.out.println("移除的元素是 "
              + data.get(position).getName());

打印出来的名字是对的,比如我按下第一个,打印的是设备1(上图名字依次是设备1.设备2.设备3,我改了好多,现在上面名字显示不出来了,不知道为什么,不过暂不纠结这个问题)是对的

支持(0) 反对(0) 菜鸟的梦醒 | 园豆:71 (初学一级) | 2014-12-31 10:12

@菜鸟的梦醒: 你删除后,调用notifyDataSetChanged,这里是不是去刷列表了,重新调用onCreate,此时devicename每次都少1,所以就加载总数-1个

支持(0) 反对(0) 醉心 | 园豆:99 (初学一级) | 2014-12-31 10:30
0

遇到同样的问题,一下午都没有解决,断点跟好多遍,数据都是正常的,但是ListView更新时总是去掉最后一项。重新加载页面时,看到结果是正确的,就是删除后刷新显示的不对,欸,揪心滴。

祁连山 | 园豆:204 (菜鸟二级) | 2015-06-18 15:25
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