Android 用ListView实现排序「建议收藏」

大家好，又见面了，我是你们的朋友全栈君。如果您正在找激活码,请点击查看最新教程,关注关注公众号 “全栈程序员社区” 获取激活教程,可能之前旧版本教程已经失效.最新Idea2022.1教程亲测有效,一键激活。

Jetbrains全系列IDE使用 1年只要46元 售后保障 童叟无欺

点击“单价”按钮或“数量信息”按钮，可按据升序或降序进行排序。

布局没什么好说的

在这里插入代码片<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".shangpingActivity" android:orientation="vertical">
<TextView android:layout_width="match_parent" android:layout_height="50dp" android:text="商品列表" android:textColor="#000000" android:textStyle="bold" android:textSize="25sp" android:gravity="center"/>
<LinearLayout android:layout_marginTop="5dp" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical">
<LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal">
<TextView android:text="ID" android:textStyle="bold" android:textColor="#000000" android:gravity="center" android:layout_width="0dp" android:layout_weight="1" android:layout_height="wrap_content"/>
<TextView android:text="商品名称" android:textStyle="bold" android:textColor="#000000" android:gravity="center" android:layout_weight="1" android:layout_width="0dp" android:layout_height="wrap_content"/>
<TextView android:text="供应商" android:textStyle="bold" android:textColor="#000000" android:gravity="center" android:layout_weight="1" android:layout_width="0dp" android:layout_height="wrap_content"/>
<TextView android:id="@+id/tv_but_price" android:text="单价(元)" android:textStyle="bold" android:textColor="#000000" android:gravity="center" android:layout_weight="1" android:layout_width="0dp" android:layout_height="wrap_content"/>
<TextView android:id="@+id/tv_but_num" android:text="数量(个)" android:textStyle="bold" android:textColor="#000000" android:gravity="center" android:layout_weight="1" android:layout_width="0dp" android:layout_height="wrap_content"/>
</LinearLayout>
<ListView android:id="@+id/list_viewsp" android:layout_width="match_parent" android:layout_height="match_parent"/>
</LinearLayout>
</LinearLayout>

接下来写 商品的实体类

在这里插入代码片
public class Shangping {
private String id;
private String name;
private String shop;
private String price;
private String num;
public Shangping(String id, String name, String shop, String price, String num) {
this.id = id;
this.name = name;
this.shop = shop;
this.price = price;
this.num = num;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getShop() {
return shop;
}
public void setShop(String shop) {
this.shop = shop;
}
public String getPrice() {
return price;
}
public void setPrice(String price) {
this.price = price;
}
public String getNum() {
return num;
}
public void setNum(String num) {
this.num = num;
}
}

实体类为后面的传值做准备

接着写listview的布局文件

在这里插入代码片
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="horizontal">
<TextView android:id="@+id/tv_id" android:gravity="center" android:layout_width="0dp" android:layout_weight="1" android:layout_height="wrap_content"/>
<TextView android:id="@+id/tv_name" android:gravity="center" android:layout_width="0dp" android:layout_weight="1" android:layout_height="wrap_content"/>
<TextView android:id="@+id/tv_shop" android:gravity="center" android:layout_width="0dp" android:layout_weight="1" android:layout_height="wrap_content"/>
<TextView android:id="@+id/tv_privc" android:gravity="center" android:layout_width="0dp" android:layout_weight="1" android:layout_height="wrap_content"/>
<TextView android:id="@+id/tv_num" android:gravity="center" android:layout_width="0dp" android:layout_weight="1" android:layout_height="wrap_content"/>
</LinearLayout>

然后写listview的适配器

在这里插入代码片
public class AdapterShangPing extends ArrayAdapter {
private int count;
public AdapterShangPing(@NonNull Context context, int resource, List<Shangping> list) {
super(context, resource,list);
count=resource;
}
@NonNull
@Override
public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
Shangping sp= (Shangping) getItem(position);
View view= LayoutInflater.from(getContext()).inflate(count,null);
TextView tv1,tv2,tv3,tv4,tv5;
tv1=view.findViewById(R.id.tv_id);
tv2=view.findViewById(R.id.tv_name);
tv3=view.findViewById(R.id.tv_shop);
tv4=view.findViewById(R.id.tv_privc);
tv5=view.findViewById(R.id.tv_num);
tv1.setText(sp.getId());
tv2.setText(sp.getName());
tv3.setText(sp.getShop());
tv4.setText(sp.getPrice());
tv5.setText(sp.getNum());
return view;
}
}

接着写排序，排序其实很简单，只需要创建一个实体类然后实现Comparator接口，然后重写compare方法

在这里插入代码片
public class Pricesort implements Comparator<Shangping> { 

@Override
public int compare(Shangping o1, Shangping o2) { 

return o1.getPrice().compareTo(o2.getPrice());
}
}

在这里插入代码片
public class Numsort implements Comparator<Shangping> { 

@Override
public int compare(Shangping o1, Shangping o2) { 

return o1.getNum().compareTo(o2.getNum());
}
}

最后附上Activity代码

在这里插入代码片
public class shangpingActivity extends AppCompatActivity {
private ListView listView;
private List<Shangping> list_sp=new ArrayList<>();//存数据
TextView tvbut_price,tvbut_num;
AdapterShangPing adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_shangping);
into();//初始化数据
listView=findViewById(R.id.list_viewsp);
tvbut_num=findViewById(R.id.tv_but_price);
tvbut_price=findViewById(R.id.tv_but_num);
adapter=new AdapterShangPing(shangpingActivity.this,R.layout.list_shangping,list_sp);//初始化适配器
listView.setAdapter(adapter);
setClick();//设置textview的点击事件，然后排序
}
private  void into(){
list_sp.add(new Shangping("1","发动机10A","发动机供应商","3,100","6"));
list_sp.add(new Shangping("2","发动机10A","发动机供应商","4,100","1"));
list_sp.add(new Shangping("3","发动机10A","发动机供应商","5,100","3"));
list_sp.add(new Shangping("4","发动机10A","发动机供应商","4,300","4"));
}
private void setClick(){
tvbut_price.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Collections.sort(list_sp,new Numsort());
adapter.notifyDataSetChanged();
}
});
tvbut_num.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Collections.sort(list_sp,new Pricesort());
adapter.notifyDataSetChanged();
}
});
}
}