Question

package sampleapp.razen.com.sampleapp;

import android.app.ListActivity;
import android.os.Bundle;

public class SectionListView extends ListActivity {

    private CustomAdapter mAdapter;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mAdapter = new CustomAdapter(this);
        for (int i = 1; i < 30; i++) {
            mAdapter.addItem("Row Enter #" + i);
            if (i % 4 == 0) {
                mAdapter.addSectionHeaderItem("Group #" + i);
            }
        }
        setListAdapter(mAdapter);
    }


}

如何编辑此for循环以实现此目的

#1 normal for loop
Text 1
Text 2
Text 3

#2 advance for loop
Text 1
Text 2
Text 3

Answer 1

public class SectionListView extends ListActivity {

    private CustomAdapter mAdapter;
    List<String> list = new ArrayList<>();

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mAdapter = new CustomAdapter(this);
        fillList();
        fillAdapter(mAdapter);

        setListAdapter(mAdapter);
    }

    private void fillList(){
        for (int i = 0; i < 10; i++) {
            //this will alternate between "normal" and "advance"
            list.add(i % 2 == 0 ? "normal" : "advance");

            list.add("Text");
            list.add("Text.");
            list.add("Text..");
        }
    }

    private void fillAdapter(CustomAdapter adapter) {
        for (int i = 0; i < list.size(); i++) {
            int row = i % 3;

            if (row == 0) {
                adapter.addSectionHeaderItem(list.get(i) + (i + 1));
                continue;
            }

            adapter.addItem(list.get(i) + (row + 1));
        }
    }
}

Answer 2

    mAdapter = new CustomAdapter(this);
        for (int i = 0; i < 29; i++) {
            int value = i % 3;
            if (value == 0) {
                mAdapter.addSectionHeaderItem("Group #" + (i+1));
            }
            mAdapter.addItem("Row Enter #" + (value + 1));
        }

“它现在正在工作如何编辑这些行输入＃1到名称所在的位置群体有不同的名称。我的意思是我组的名字一个人不应该在第二组。提前感谢你帮助“

你可以这样做：

class Group {
  String name;
  String members[];

  public Group(String name, String [] members) {
    this.name = name;
    this.members = members;
  }
}

在你的onCreate（）中：

ArrayList<Group> groups = new ArrayList<>();
groups.add(new Group("Group A", new String[]{"A","B","C"}));
groups.add(new Group("Group B", new String[]{"A","B","C"}));
groups.add(new Group("Group C", new String[]{"A","B","C"}));
groups.add(new Group("Group D", new String[]{"A","B","C"}));
groups.add(new Group("Group F", new String[]{"A","B","C"}));

mAdapter = new CustomAdapter(this);
for(Group group : groups) {
    mAdapter.addSectionHeaderItem(group.name);
    for (int i = 0; i < group.members.length; i ++) {
        mAdapter.addItem(group.members[i]);
    }
}
setListAdapter(mAdapter);

我怎样才能在java中实现这个for循环

2 个答案: