android——listview删除的简单实现

最新推荐文章于 2024-09-15 13:33:54 发布

xiaoze01

最新推荐文章于 2024-09-15 13:33:54 发布

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文章标签： android item listvie

本文链接：https://blog.youkuaiyun.com/xiaoze01/article/details/48949119

本文介绍了一个简单的Android应用，该应用使用ListView展示省份名称列表，并实现了列表项的选择及删除功能。通过点击按钮可以删除已选中的列表项。

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

import android.os.Bundle;
import android.app.Activity;
import android.text.Layout;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.ListView;
import android.widget.TextView;
//实现接口，为button添加事件监听
public class MainActivity extends Activity implements OnClickListener{
List<String> allData;
List<String> selectedData;
private ListView lv;
private Button button;
MyAdapter adapter=new MyAdapter();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
allData=new ArrayList<String>();
allData.add("北京");
allData.add("上海");
allData.add("山东");
allData.add("河北");
allData.add("辽宁");
allData.add("广东");
allData.add("湖北");
allData.add("四川");
allData.add("内蒙古");
selectedData=new ArrayList<String>();
lv=(ListView) findViewById(R.id.lv);
lv.setOnItemClickListener(new OnItemClickListener() {

@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// TODO Auto-generated method stub
selectedData.add(allData.get(position));
}
});
button=(Button) findViewById(R.id.bt_delete);
lv.setAdapter(adapter);
button.setOnClickListener(this);

}
class MyAdapter extends BaseAdapter{

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

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

@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}
class ViewHolder{
TextView tv;
CheckBox cb;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder vh;
if(convertView==null){
vh=new ViewHolder();
convertView=LayoutInflater.from(MainActivity.this).inflate(R.layout.item_layout,parent,false);
vh.tv=(TextView) convertView.findViewById(R.id.tv_addr);
vh.cb=(CheckBox) convertView.findViewById(R.id.cb);
convertView.setTag(vh);
}
else {
vh=(ViewHolder) convertView.getTag();
}
vh.tv.setText(allData.get(position));

return convertView;
}

}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
allData.removeAll(selectedData);
selectedData.clear();
adapter.notifyDataSetChanged();
lv.setAdapter(adapter);
}
}