问题描述
ListView删除元素不自动刷新，notifyDataSetChanged（）无效
CityActivity
package com.nero.neroyang.wheather;import android.app.Activity;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.support.annotation.NonNull;import android.view.LayoutInflater;import android.view.View;import android.widget.AdapterView;import android.widget.ListView;import android.widget.Toast;import com.nero.neroyang.wheather.Listener.MyOnClickListener;import com.nero.neroyang.wheather.adapter.CityListAdapter;import java.util.ArrayList;import java.util.List;import java.util.Map;/** * Created by neroyang on 2017/5/17. */public class CityActivity extends Activity implements AdapterView.OnItemClickListener { private ListView listView; private List<String> cities; private List<Map<String,Object>> litems; private CityListAdapter cityListAdapter; @Override protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.city_list);initView(); } @NonNull @Override public LayoutInflater getLayoutInflater() {return super.getLayoutInflater(); } private void initView() {listView = (ListView) this.findViewById(R.id.city_list);cities = new ArrayList<String>();for(int i = 0;i<100;i++) { cities.add('威海'+i);}cityListAdapter = new CityListAdapter(cities,getApplicationContext(),getClickListener);listView.setAdapter(cityListAdapter);listView.setOnItemClickListener(this); } private MyOnClickListener getClickListener = new MyOnClickListener() {@Overridepublic void myOnClick(int position, View v) { cities.remove(position); cityListAdapter.setData(cities); cityListAdapter.notifyDataSetChanged();} }; @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { }}
Adapter
package com.nero.neroyang.wheather.adapter;import android.content.Context;import android.database.DataSetObserver;import android.util.Log;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.Adapter;import android.widget.ArrayAdapter;import android.widget.BaseAdapter;import android.widget.ImageButton;import android.widget.ImageView;import android.widget.ListAdapter;import android.widget.TextView;import android.widget.Toast;import com.nero.neroyang.wheather.CityActivity;import com.nero.neroyang.wheather.Listener.MyOnClickListener;import com.nero.neroyang.wheather.MainActivity;import com.nero.neroyang.wheather.R;import java.util.ArrayList;import java.util.List;/** * Created by neroyang on 2017/5/17. */public class CityListAdapter extends BaseAdapter { private List<String> cityList; private Context context; private LayoutInflater inflater; private MyOnClickListener mylistener; public CityListAdapter(List<String> citylist,Context context,MyOnClickListener listener) {this.cityList = citylist;this.context =context;mylistener = listener;inflater = (LayoutInflater) this.context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); } public void setData(List<String> data){cityList = data; } @Override public boolean areAllItemsEnabled() {return false; } @Override public boolean isEnabled(int position) {return false; } @Override public void registerDataSetObserver(DataSetObserver observer) { } @Override public void unregisterDataSetObserver(DataSetObserver observer) { } @Override public int getCount() {return cityList.size(); } @Override public Object getItem(int position) {return position; } @Override public long getItemId(int position) {return position; } @Override public boolean hasStableIds() {return false; } @Override public View getView(final int position, View convertView, final ViewGroup parent) {ViewHolder holder = null;if (convertView == null) { convertView = inflater.inflate(R.layout.city_item, null); holder = new ViewHolder(); holder.textView = (TextView) convertView.findViewById(R.id.city_item); holder.imageView = (ImageView) convertView.findViewById(R.id.delete_item); convertView.setTag(holder);} else { holder = (ViewHolder) convertView.getTag();}holder.textView.setText(cityList.get(position));holder.imageView.setOnClickListener(mylistener);holder.imageView.setTag(position);return convertView; } @Override public int getItemViewType(int position) {return position; } @Override public int getViewTypeCount() {return 1; } @Override public boolean isEmpty() {return false; } public class ViewHolder {public TextView textView;public ImageView imageView; }}
OnclickListener
package com.nero.neroyang.wheather.Listener;import android.view.View;/** * Created by neroyang on 2017/5/17. */public abstract class MyOnClickListener implements View.OnClickListener { @Override public void onClick(View v) {myOnClick((Integer) v.getTag(), v); } public abstract void myOnClick(int position, View v);}
问题解答
回答1：这句放到外面去
cityListAdapter.setData(cities);
