Question

我创建数据库和表“TABLE_NAME”，其中包含一个问题和4个选项我的问题是如何用listview中的选项显示这个问题我搜索了很多文章但是找不到合适的方法一次添加5个项目请提供一些参考或代码我正在尝试使用可扩展的listview。但它没有显示问题，只显示了 4选项中的一个选项。
这是我的示例代码。

public class ObjectiveExamActivity extends ExpandableListActivity {

@SuppressWarnings("unchecked")
public void onCreate(Bundle savedInstanceState) {
    try{
         super.onCreate(savedInstanceState);
         setContentView(R.layout.displayobjectiveque);
         Intent intent=getIntent();
         setResult(RESULT_OK, intent);

    SimpleExpandableListAdapter expListAdapter =
        new SimpleExpandableListAdapter(
                this,
                createGroupList(),              
                R.layout.group_row,             
                new String[] { "Group Item" },  
                new int[] { R.id.row_name },    
                createChildList(),              
                R.layout.child_row,             
                new String[] {"Sub Item"},      
                new int[] { R.id.grp_child}     
            );
        setListAdapter( expListAdapter );       

    }catch(Exception e){
        System.out.println("Error+++ " + e.getMessage());
    }
}

@SuppressWarnings("unchecked")
private List createGroupList() {
      ArrayList result = new ArrayList();
    final MySQLiteHelper m=new MySQLiteHelper(getBaseContext());
    final List<ObjectiveWiseQuestion> LocWiseProfile= m.getAllObjectiveQuestion();       

    for (final ObjectiveWiseQuestion cn : LocWiseProfile)
    {       
        HashMap m1=new HashMap();
        m1.put("Item","Option:"+cn.getQuestion());
        result.add(m1);         
    }
     /* for( int i = 0 ; i < 15 ; ++i ) { // 15 groups........
        HashMap m = new HashMap();
        m.put( "Group Item","Group Item " + i ); // the key and it's value.
        result.add( m );
      }*/
      return (List)result;
}

@SuppressWarnings("unchecked")
private List createChildList()
{
    final MySQLiteHelper m=new MySQLiteHelper(getBaseContext());
    final List<ObjectiveWiseQuestion> LocWiseProfile= m.getAllObjectiveQuestion();  
    ArrayList result = new ArrayList();
    for (final ObjectiveWiseQuestion cn : LocWiseProfile)
    { // this -15 is the number of groups(Here it's fifteen)
      /* each group need each HashMap-Here for each group we have 3 subgroups */
      ArrayList secList = new ArrayList(); 
      for( int n = 0 ; n < 4 ; n++ ) 
      {
        HashMap child = new HashMap();
        child.put( "Sub Item", "Sub Item " + m.getAllObjectiveQuestion() );
        child.put(cn.getOptionA(), cn.getOptionB());
        child.put("Option C", cn.getOptionC());
        child.put("Option D", cn.getOptionD());
        secList.add( child );
      }
     result.add( secList );
    }        
    return result;
}

public void  onContentChanged  () {
    System.out.println("onContentChanged");
    super.onContentChanged();         
}
/* This function is called on each child click */
public boolean onChildClick( ExpandableListView parent, View v, int groupPosition,int childPosition,long id) {
    System.out.println("Inside onChildClick at groupPosition = " + groupPosition +" Child clicked at position " + childPosition);
    return true;
}

/* This function is called on expansion of the group */
public void  onGroupExpand  (int groupPosition) {
    try{
         System.out.println("Group exapanding Listener => groupPosition = " + groupPosition);
    }catch(Exception e){
        System.out.println(" groupPosition Errrr +++ " + e.getMessage());
    }
}

}

提前致谢。

Answer 1

Expandable ListView可以是你的工作。

Answer 2

我不确定你是否需要，但试试这个示例app：

布局：

<!-- list_item_multiselect.xml -->
<?xml version="1.0" encoding="utf-8"?>
<CheckBox xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/variant"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Variant" />
<!-- main.xml -->
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <ListView
        android:id="@+id/listView1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >
    </ListView>

</LinearLayout>

的活动：

public class Option_listActivity extends Activity {

    private static final String TITLE = "var_title"; 

    private ListView mListView; 

    private Map<String, String> createVariant(String text) 
    {
        Map<String, String> res = new HashMap<String, String>();
        res.put(TITLE, text);
        return res;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        mListView = (ListView)findViewById(R.id.listView1);

        List<Map<String, String>> variants = new ArrayList<Map<String, String>>();
        variants.add(createVariant("Option 1"));
        variants.add(createVariant("Option 2"));
        variants.add(createVariant("Option 3"));
        variants.add(createVariant("Option 4"));

        TextView header = new TextView(this);
        header.setText("Choose variant:");
        mListView.addHeaderView(header);

        Button footer = new Button(this);
        footer.setText("Check");
        footer.setOnClickListener(okayButtonListener);
        mListView.addFooterView(footer);

        mListView.setAdapter(new SimpleAdapter(this, variants, R.layout.list_item_multiselect, new String[] {TITLE}, new int[] {R.id.variant}));


    }

    private OnClickListener okayButtonListener = new OnClickListener() {

        @Override
        public void onClick(View v) {
            int count = mListView.getCount() - mListView.getHeaderViewsCount() - mListView.getFooterViewsCount();
            String result = "";
            for (int i = 0; i < count; i++) 
            {
                CheckBox cb = (CheckBox)mListView.getChildAt(i + 1);
                if (cb.isChecked()) 
                {
                    result += "Option " + (i + 1) + " checked\n";
                }
            }
            Toast.makeText(Option_listActivity.this, result, Toast.LENGTH_LONG).show();
        }

    };
}

如果您只需要一个可选择的变体，则需要进行一些升级

如何在ListView中添加一个带有四个选项的项目？

2 个答案: