如何将嵌套的 XML 结构实现为 2 个 ListView？

Question

我正在尝试解析具有以下结构的 XML 文件：

<groups>
  <group>
    <id>...</id>
    <name>...</name>
    <description>...</description>
    <actions>
      <action>...</action>
      <action>...</action>
    </actions>
  </group>
  <group>
    <id>...</id>
    <name>...</name>
    <description>...</description>
    <actions>
      <action>...</action>
      <action>...</action>
      <action>...</action>
    </actions>
  </group>
  <group>
    <id>...</id>
    <name>...</name>
    <description>...</description>
    <actions>
      <action>...</action>
    </actions>
  </group>
</groups>

目前在第一个 ListView 中，每行可见“名称”和“描述”。这是功能齐全的。选择一行时，将使用另一个 ListView 创建一个新活动。在这里，我想根据上一个列表中的选定位置显示每行的操作。我该怎么做？我还尝试将“动作”添加到我的其他项目添加到的地图中，但它只为每组添加 1 个“动作”。 请指教？

公共类 ErrorCodeList 扩展 ListActivity {

public static final String LANGUAGE = null;

public ArrayList<HashMap<String, String>> mylist;
public ListAdapter adapter;
public Dialog progDialog;
public ProgressBar progBar;
public TextView lblMessage;

private Intent myIntent;
private String  URLvariable;


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

    myIntent = getIntent();
    URLvariable = myIntent.getExtras().getString("urlType");

    mylist = new ArrayList<HashMap<String, String>>();

    adapter = new SimpleAdapter(this, mylist , R.layout.activity_error_list, 
                    new String[] { "tid", "tname" }, 
                    new int[] { R.id.item_id, R.id.item_title });

    final ListView lv = getListView();
    lv.setTextFilterEnabled(true);  
    lv.setOnItemClickListener(new OnItemClickListener() {
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {              
            @SuppressWarnings("unchecked")
            HashMap<String, String> hashMap = (HashMap<String, String>) lv.getItemAtPosition(position);                 

            Intent myIntent = new Intent(view.getContext(),ErrorCodeDetails.class);
            myIntent.putExtra("map",hashMap);
            startActivity(myIntent);

        }
    });

    progDialog = new Dialog(this, R.style.progress_dialog);
    progDialog.setContentView(R.layout.progress_dialog);

    progBar = (ProgressBar) progDialog.findViewById(R.id.progBar);
    lblMessage = (TextView) progDialog.findViewById(R.id.txtProgMessage);
    lblMessage.setText("Please Wait.....");

    progDialog.show();
    new GetDataTask().execute();        

}


private Boolean isOnline()  {
    ConnectivityManager cm = (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo ni = cm.getActiveNetworkInfo();
    if(ni != null && ni.isConnected())
        return true;

    return false;
}

private class GetDataTask extends AsyncTask<Void, Void, Integer> {

    @Override
    protected Integer doInBackground(Void... params) {

        if(isOnline()){
            mylist.clear();                  
            }  

            // Start the http request
            String feedURL="http://...";        
            String xml = XMLfunctions.getXML(feedURL);
            Document doc = XMLfunctions.XMLfromString(xml);

            int numResults = 1;

            if((numResults <= 0)){
                Toast.makeText(ErrorCodeList.this, "Geen resultaten gevonden", Toast.LENGTH_LONG).show();  
                finish();
            }

            NodeList troubles = doc.getElementsByTagName("trouble");

            for (int i = 0; i < troubles.getLength(); i++) {                            
                HashMap<String, String> map = new HashMap<String, String>();    

                Element e = (Element)troubles.item(i);
                if((e.getAttributes().getNamedItem("type").getNodeValue().equals("error"))) {
                    //map.put("id", "ID:" + Integer.valueOf(e.getAttributes().getNamedItem("id").getNodeValue()));
                    //map.put("status", "Status:" + (e.getAttributes().getNamedItem("status").getNodeValue()));
                    map.put("tid", XMLfunctions.getValue(e, "id"));
                    map.put("tname", XMLfunctions.getValue(e, "name"));
                    map.put("tdescription", XMLfunctions.getValue(e, "description"));

                    //NodeList  ns=e.getElementsByTagName("trouble_cause");
                    mylist.add(map);
                }           
            }
            System.out.println(mylist);
        }else{
            Toast.makeText(ErrorCodeList.this, "No connection..", Toast.LENGTH_LONG).show();            
        }

        return 1;
    }

    @Override
    protected void onPostExecute(Integer result) {

        setListAdapter(adapter);
        progDialog.dismiss();
        super.onPostExecute(result);
    }
}

}

Answer 1

创建一个数据对象组。

public class Group {
private String id;
private String name;
private String description;
private ArrayList<String> actions;
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 getDescription() {
    return description;
}
public void setDescription(String description) {
    this.description = description;
}
public ArrayList<String> getActions() {
    return actions;
}
public void setActions(ArrayList<String> actions) {
    this.actions = actions;
}
}

您的活动代码将如下所示。

public class MainActivity extends Activity implements OnItemClickListener {

private ArrayList<Group> groups;
private ListView list;
private MyAdapter adapter;
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    list = (ListView)findViewById(R.id.my_list);
    list.setAdapter(adapter = new MyAdapter());
    list.setOnItemClickListener(this);
    parseXML();
}


private void parseXML(){
    // TODO: CODE TO PARSE XML
    adapter.notifyDataSetChanged();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.activity_main, menu);
    return true;
}


public class MyAdapter extends BaseAdapter{

    @Override
    public int getCount() {
        // TODO Auto-generated method stub
        return groups.size();
    }

    @Override
    public Object getItem(int arg0) {
        // TODO Auto-generated method stub
        return groups.get(0);
    }

    @Override
    public long getItemId(int position) {
        // TODO Auto-generated method stub
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        // TODO: Create row view here.
        // USE groups to create list here
        return null;
    }

}


@Override
public void onItemClick(AdapterView<?> listView, View rowView, int position, long column) {
    // TODO Auto-generated method stub
    Group clickedGroup = groups.get(position);
    Intent intent = new Intent(this, SecondActivity.class);
    Bundle bundle = new Bundle();
    bundle.putStringArrayList("ACTIONS", clickedGroup.getActions());
    intent.putExtra("BUNDLE", bundle);
    startActivity(intent);
}

}

您的第二个活动将如下所示

public class SecondActivity extends Activity {

private ArrayList<String> actions;
private ListView list;
private ActionAdapter adapter;
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_second);

    Intent intent = getIntent();
    Bundle bundle = intent.getBundleExtra("BUNDLE");
    actions = bundle.getStringArrayList("ACTIONS");

    list = (ListView)findViewById(R.id.my_list2);
    list.setAdapter(adapter = new ActionAdapter());
}



@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.activity_main, menu);
    return true;
}


public class ActionAdapter extends BaseAdapter{

    @Override
    public int getCount() {
        // TODO Auto-generated method stub
        return actions.size();
    }

    @Override
    public Object getItem(int arg0) {
        // TODO Auto-generated method stub
        return actions.get(0);
    }

    @Override
    public long getItemId(int position) {
        // TODO Auto-generated method stub
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        // TODO: Create row view here.
        // USE actions to create list here
        return null;
    }

}

}