安卓：从帮助创建列表视图上下文菜单上下文、视图、菜单、列表

由网友(此用户已被举报)分享简介：这是类。我想右键菜单添加到它长preSS但作为一个新手，我发现自己很难。请帮助。私人的ListView lvUsers; 私人的ArrayList＆LT; UserBO＆GT; mListUsers; / **当第一次创建活动调用。 * / @覆盖公共无效的onCreate（捆绑savedInst...

这是类。我想右键菜单添加到它长preSS但作为一个新手，我发现自己很难。请帮助。

 私人的ListView lvUsers; 私人的ArrayList＆LT; UserBO＆GT; mListUsers;    / **当第一次创建活动调用。 * /    @覆盖    公共无效的onCreate（捆绑savedInstanceState）{        super.onCreate（savedInstanceState）;        的setContentView（R.layout.select）;        mListUsers = getUsers（）;        lvUsers =（ListView控件）findViewById（R.id.lv_user）;        lvUsers.setAdapter（新ListAdapter（这一点，R.id.lv_user，mListUsers））;    }    公众的ArrayList＆LT; UserBO＆GT; getUsers（）{  DBAdapter dbAdapter = DBAdapter.getDBAdapterInstance（本）;  尝试{   dbAdapter.createDataBase（）;  }赶上（IOException异常五）{   Log.i（***选择，e.getMessage（））;  }     dbAdapter.openDataBase（）;  查询字符串=SELECT * FROM用户;  ArrayList的＆LT; ArrayList的＆LT;串GT;＆GT; StringList的= dbAdapter.selectRecordsFromDBList（查询，NULL）;  dbAdapter.close（）;  ArrayList的＆LT; UserBO＆GT; usersList =新的ArrayList＆LT; UserBO＆GT;（）;  的for（int i = 0; I＆LT; stringList.size（）;我++）{   ArrayList的＆LT;串GT;清单= stringList.get（I）   UserBO用户=新UserBO（）;   尝试{    user.id =的Integer.parseInt（list.get（0））;    user.name = list.get（1）;    user.age = list.get（2）;   }赶上（例外五）{    Log.i（***+ Select.class.toString（），e.getMessage（））;   }   usersList.add（用户）;  }  返回usersList; } // *** *** ListAdapter 私有类ListAdapter扩展ArrayAdapter＆LT; UserBO＆GT; {// --CloneChangeRequired  私人的ArrayList＆LT; UserBO＆GT; mList; // --CloneChangeRequired  私人语境mContext;  公共ListAdapter（上下文的背景下，INT textViewResourceId，ArrayList的＆LT; UserBO＆GT;名单）{// --CloneChangeRequired   超（背景下，textViewResourceId，清单）;   this.mList =清单;   this.mContext =背景;  }  公共查看getView（INT位置，查看convertView，父母的ViewGroup）{   查看查看= convertView;   尝试{   如果（查看== NULL）{    LayoutInflater VI =（LayoutInflater）getSystemService（Context.LAYOUT_INFLATER_SERVICE）;    鉴于= vi.inflate（R.layout.list_item，NULL）; // --CloneChangeRequired（LIST_ITEM）   }   最后UserBO的listItem = mList.get（位置）; // --CloneChangeRequired   如果（的listItem！= NULL）{    //设置LIST_ITEM意见    （（的TextView）view.findViewById（R.id.tv_id））.setText（listItem.getId（）+）;    （（的TextView）view.findViewById（R.id.tv_name））.setText（listItem.getName（））;    （（的TextView）view.findViewById（R.id.tv_age））.setText（listItem.getAge（）+）;   }}赶上（例外五）{    Log.i（Select.ListAdapter.class.toString（），e.getMessage（））;   }   返回视图。  } }

解决方案 wps中的普通视图在哪

这应该做的伎俩。不要忘了：registerForContextMenu（lvUsers）;

  / **第一次创建活动时调用。 * /     @覆盖     公共无效的onCreate（捆绑savedInstanceState）{       super.onCreate（savedInstanceState）;       的setContentView（R.layout.select）;        mListUsers = getUsers（）;        lvUsers =（ListView控件）findViewById（R.id.lv_user）;        lvUsers.setAdapter（新ListAdapter（这一点，R.id.lv_user，mListUsers））;        ** registerForContextMenu（lvUsers）**        }@覆盖公共无效onCreateContextMenu（文本菜单菜单视图V，ContextMenuInfo menuInfo）{  super.onCreateContextMenu（菜单，V，menuInfo）;  MenuInflater吹气= getMenuInflater（）;  inflater.inflate（R.menu.context_menu，菜单）;}@覆盖公共布尔onContextItemSelected（菜单项项）{  AdapterContextMenuInfo信息=（AdapterContextMenuInfo）item.getMenuInfo（）;  开关（item.getItemId（））{  案例R.id.edit：    editNote（info.id）;    返回true;  案例R.id.delete：    deleteNote（info.id）;    返回true;  默认：    返回super.onContextItemSelected（项目）;  }}＆LT; XML版本=1.0编码=UTF-8＆GT？;＆LT;菜单的xmlns：机器人=http://schemas.android.com/apk/res/android＆GT;    ＆LT;项目机器人：ID =@ + ID /编辑          机器人：标题=@字符串/编辑/＆GT;    ＆LT;项目机器人：ID =@ + ID /删除          机器人：标题=@字符串/删除/＆GT;＆所述; /菜单＆gt;

this is the class. i want to add context menu to it on longpress but as a newbie i find i difficult. Please help.

 private ListView lvUsers;
 private ArrayList<UserBO> mListUsers;


    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.select);


        mListUsers = getUsers();
        lvUsers = (ListView) findViewById(R.id.lv_user);
        lvUsers.setAdapter(new ListAdapter(this, R.id.lv_user, mListUsers));                

    }

    public ArrayList<UserBO> getUsers(){          

  DBAdapter dbAdapter=DBAdapter.getDBAdapterInstance(this);
  try {
   dbAdapter.createDataBase();
  } catch (IOException e) {
   Log.i("*** select ",e.getMessage());
  }
     dbAdapter.openDataBase();  
  String query="SELECT * FROM user;";
  ArrayList<ArrayList<String>> stringList = dbAdapter.selectRecordsFromDBList(query, null);
  dbAdapter.close();

  ArrayList<UserBO> usersList = new ArrayList<UserBO>();
  for (int i = 0; i < stringList.size(); i++) {
   ArrayList<String> list = stringList.get(i);
   UserBO user = new UserBO();
   try {
    user.id = Integer.parseInt(list.get(0));
    user.name = list.get(1);
    user.age = list.get(2);
   } catch (Exception e) {
    Log.i("***" + Select.class.toString(), e.getMessage());
   }
   usersList.add(user);
  }
  return usersList;
 }

 // ***ListAdapter***
 private class ListAdapter extends ArrayAdapter<UserBO> {  // --CloneChangeRequired
  private ArrayList<UserBO> mList;  // --CloneChangeRequired
  private Context mContext;

  public ListAdapter(Context context, int textViewResourceId,ArrayList<UserBO> list) { // --CloneChangeRequired
   super(context, textViewResourceId, list);
   this.mList = list;
   this.mContext = context;
  }

  public View getView(int position, View convertView, ViewGroup parent){
   View view = convertView;
   try{
   if (view == null) {
    LayoutInflater vi = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    view = vi.inflate(R.layout.list_item, null);  // --CloneChangeRequired(list_item)
   }
   final UserBO listItem = mList.get(position);  // --CloneChangeRequired    
   if (listItem != null) {
    // setting list_item views      
    ( (TextView) view.findViewById(R.id.tv_id) ).setText( listItem.getId()+"");
    ( (TextView) view.findViewById(R.id.tv_name) ).setText( listItem.getName() );
    ( (TextView) view.findViewById(R.id.tv_age) ).setText( listItem.getAge()+"" );

   }}catch(Exception e){
    Log.i(Select.ListAdapter.class.toString(), e.getMessage());    
   }
   return view;
  }

 }

解决方案

This should do the trick. Don't forget to: registerForContextMenu(lvUsers);

/** Called when the activity is first created. */
     @Override
     public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.select);

        mListUsers = getUsers();
        lvUsers = (ListView) findViewById(R.id.lv_user);
        lvUsers.setAdapter(new ListAdapter(this, R.id.lv_user, mListUsers));  
        **registerForContextMenu(lvUsers);**      
        }

@Override
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) {
  super.onCreateContextMenu(menu, v, menuInfo);
  MenuInflater inflater = getMenuInflater();
  inflater.inflate(R.menu.context_menu, menu);
}

@Override
public boolean onContextItemSelected(MenuItem item) {
  AdapterContextMenuInfo info = (AdapterContextMenuInfo) item.getMenuInfo();
  switch (item.getItemId()) {
  case R.id.edit:
    editNote(info.id);
    return true;
  case R.id.delete:
    deleteNote(info.id);
    return true;
  default:
    return super.onContextItemSelected(item);
  }
}

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:id="@+id/edit"
          android:title="@string/edit" />
    <item android:id="@+id/delete"
          android:title="@string/delete" />
</menu>

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相关专题：上下文；视图；菜单；列表；发布时间：2023-09-06 06:01:32