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Android 对List中的实体的某一项排序

创建时间:2016-04-21 投稿人: 浏览次数:943

对People实体中的age进行排序

People实体

public class People {
private String name;
private String age;
public String getName() {
    return name;
}
public void setName(String name) {
    this.name = name;
}
public String getAge() {
    return age;
}
public void setAge(String age) {
    this.age = age;
}

}

实现Comparator处理排序

public class PeopleComparatpor implements Comparator<People>{
    private String type;
    /**
     * 1降序
     * 其余升序
     * */
  public PeopleComparatpor(String type){
      this.type=type;
  }
    @Override
    public int compare(People lhs, People rhs) {
        // TODO 自动生成的方法存根
        if(type.equals("1")){
            return Integer.parseInt(rhs.getAge())-Integer.parseInt(lhs.getAge());
        }else{
            return Integer.parseInt(lhs.getAge())-Integer.parseInt(rhs.getAge());
        }
    }

}

Comparator的使用

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        List<People> list=new ArrayList<People>();
        People p1=new People();
        p1.setAge("9");
        p1.setName("zs");
        list.add(p1);
        People p2=new People();
        p2.setAge("29");
        p2.setName("ss");
        list.add(p2);
        People p3=new People();
        p3.setAge("19");
        p3.setName("fs");
        list.add(p3);
        People p4=new People();
        p4.setAge("59");
        p4.setName("ns");
        list.add(p4);
        People p5=new People();
        p5.setAge("39");
        p5.setName("bs");
        list.add(p5);
        Comparator<People> com=new PeopleComparatpor("2");
        Collections.sort(list, com);
        for(People p:list){
            Log.d("xxx", p.getAge());
        }
    }

}
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