android – 在按钮单击时从自定义列表视图中删除项目
作者:互联网
我有一个自定义列表视图,有2个textviews和2个按钮(播放和删除按钮)
我想点击删除按钮删除当前行.
我的适配器类
import java.util.ArrayList;
import android.content.Context;
import android.graphics.Color;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.TextView;
public class SunetePreferateAdaptor extends BaseAdapter {
class ob {
String titlu, descriere;
public ob(String titlu, String descriere) {
this.titlu = titlu;
this.descriere = descriere;
}
}
ArrayList<ob> lista;
Context context;
public SunetePreferateAdaptor(Context context) {
this.context = context;
lista = new ArrayList<ob>();
for (int i = 1; i <= 20; i++) {
lista.add(new ob("text", "text2"));
}
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return lista.size();
}
@Override
public Object getItem(int arg0) {
// TODO Auto-generated method stub
return lista.get(arg0);
}
@Override
public long getItemId(int arg0) {
// TODO Auto-generated method stub
return arg0;
}
@Override
public View getView(int arg0, View arg1, ViewGroup arg2) {
// TODO Auto-generated method stub
LayoutInflater inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View row = inflater.inflate(R.layout.single_favsound_row, arg2, false);
Button b2 = (Button) row.findViewById(R.id.button2);
b2.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
// here, i want to delete the current row of the listview
//
//
}
});
TextView titlu = (TextView) row.findViewById(R.id.singleText2);
titlu.setText(lista.get(arg0).titlu);
titlu.setTextColor(Color.WHITE);
titlu.setTypeface(Global.font1);
TextView descriere = (TextView) row.findViewById(R.id.singleText1);
descriere.setText(lista.get(arg0).descriere);
descriere.setTextColor(Color.WHITE);
descriere.setTypeface(Global.font1);
return row;
}
}
那我该怎么办呢?
我已经尝试使arraylist静态并在点击时删除它的项目..但没有成功..
解决方法:
您无需将ArrayList设为静态.
您需要从列表中删除填充listview的数据.你调用notifyDataSetChanged();刷新lsitview.
您可以删除静态关键字并使用
Button b2 = (Button) row.findViewById(R.id.button1);
b2.setTag(arg0);
b2.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
int pos = (int)arg0.getTag();
lista.remove(pos);
SunetePreferateAdaptor.this.notifyDataSetChanged(); }
});
替代方案
您可以将列表传递给适配器类的构造函数.
ListView lv = (ListView) this.findViewById(R.id.listView1);
ArrayList<ob> lista = new ArrayList<ob>();
for (int i = 1; i <= 20; i++) {
lista.add(new ob("text", "text"+i));
}
lv.setAdapter(new SunetePreferateAdaptor(this,lista));
然后将它放在一个单独的.java文件中
class ob {
String titlu, descriere;
public ob(String titlu, String descriere) {
this.titlu = titlu;
this.descriere = descriere;
}
}
然后
public class SunetePreferateAdaptor extends BaseAdapter {
ArrayList<ob> lista;
Context context;
public SunetePreferateAdaptor(Context context, ArrayList<ob> lista ) {
this.context = context;
this.lista= lista;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return lista.size();
}
@Override
public Object getItem(int arg0) {
// TODO Auto-generated method stub
return lista.get(arg0);
}
@Override
public long getItemId(int arg0) {
// TODO Auto-generated method stub
return arg0;
}
@Override
public View getView(int arg0, View arg1, ViewGroup arg2) {
// TODO Auto-generated method stub
LayoutInflater inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View row = inflater.inflate(R.layout.fg, arg2, false);
Button b2 = (Button) row.findViewById(R.id.button1);
b2.setTag(arg0);
b2.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
int pos = (int)arg0.getTag();
lista.remove(pos);
SunetePreferateAdaptor.this.notifyDataSetChanged(); }
});
TextView titlu = (TextView) row.findViewById(R.id.textView1);
titlu.setText(lista.get(arg0).titlu);
titlu.setTextColor(Color.WHITE);
TextView descriere = (TextView) row.findViewById(R.id.textView2);
descriere.setText(lista.get(arg0).descriere);
return row;
}
}
标签:android-adapter,android,listview 来源: https://codeday.me/bug/20191006/1858249.html