Question

请帮我解决菜单处理程序问题。我想制作菜单处理程序，我可以在不同的活动中调用。一切都很好。列表从服务器获取，菜单也出现，但当我点击任何菜单按钮“强制关闭”弹出。

这是meun处理程序类

package com.droidnova.android.howto.optionmenu;

import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.content.Intent;

public class MenuHandler extends Activity{
    private Activity activity;

    public MenuHandler(Activity activity) {
        this.activity = activity;
    }

    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater inflater = activity.getMenuInflater();
        inflater.inflate(R.menu.menu, menu);
        return true;
    }

    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case R.id.settings:     
                Intent intent = new Intent(this, ShowSettings.class);
                  startActivity(intent);
            break;
            case R.id.services:     
                Intent intent2 = new Intent(this, Test.class);
                startActivity(intent2);
              break;
            case R.id.Quit: 

                finish();



                break;
            default:    
            break;
        }
        return true;
    }
}

在这里，我想要相同的菜单工作。

package com.droidnova.android.howto.optionmenu;

import java.util.ArrayList;
import java.util.HashMap;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;

import android.app.ListActivity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.Toast;

public class Test extends ListActivity  {
    private MenuHandler menuHandler;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.listplaceholder);
        menuHandler = new MenuHandler(this);
        ArrayList<HashMap<String, String>> mylist = new ArrayList<HashMap<String, String>>();

        JSONObject json = JSONfunctions.getJSONfromURL("http://midsweden.gofreeserve.com/fetch.php");

        try{

            JSONArray  earthquakes = json.getJSONArray("earthquakes");

            for(int i=0;i<earthquakes.length();i++){                        
                HashMap<String, String> map = new HashMap<String, String>();    
                JSONObject e = earthquakes.getJSONObject(i);

                map.put("id",  String.valueOf(i));
                map.put("name", "Earthquake name:" + e.getString("name"));
                map.put("password", "Magnitude: " +  e.getString("password"));
                mylist.add(map);            
            }       
        }catch(JSONException e)        {
             Log.e("log_tag", "Error parsing data "+e.toString());
        }

        ListAdapter adapter = new SimpleAdapter(this, mylist , R.layout.test, 
                        new String[] { "name", "magnitude" }, 
                        new int[] { R.id.item_title, R.id.item_subtitle });

        setListAdapter(adapter);

        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> o = (HashMap<String, String>) lv.getItemAtPosition(position);                   
                Toast.makeText(Test.this, "ID '" + o.get("id") + "' was clicked.", Toast.LENGTH_SHORT).show(); 

            }
        });
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        return menuHandler.onCreateOptionsMenu(menu);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        return menuHandler.onOptionsItemSelected(item);
    }
}

以下是我在logcat中获得的内容 enter image description here

Answer 1

如果没有关于代码抛出的异常的任何特定logcat反馈，我最好的猜测是Android不喜欢你通过实例化一个Context来实现多个Activity实例。另一个。

实现目标的更好方法是使用MenuHandler作为要显示菜单的任何Activity的基类。换句话说：

单独留下MenuHandler，除了摆脱那个构造函数。
让所有Activity课程延长MenuHandler以引入该功能。

菜单处理程序的活动

1 个答案: