选定的listitem通过json在另一个活动中显示它们的详细信息后？

Posted 2023-04-15

【中文标题】选定的listitem通过json在另一个活动中显示它们的详细信息后？

【英文标题】：After selected listitem shows the details of them on another activity through json?

【发布时间】：2013-04-06 01:47:17

【问题描述】：

我有显示列表项的活动，并且在列表项中我只想显示地点的名称并且我能够显示它，但是当我单击我想要与该地点名称相关的项目时，它会显示有关另一项活动的详细信息，即位置详细信息。所以请帮我解决我的问题，我是 android 新手。

这是我的两个活动代码：

locationList=( ListView)findViewById(R.id.list_Surroundings);



    // Hashmap for ListView
    ArrayList<HashMap<String, String>> locationOfList = new ArrayList<HashMap<String, String>>();

    adapter = new SimpleAdapter(this, locationOfList,
            R.layout.list_item1,
            new String[]  TAG_NAME , new int[] 
                    R.id.name);

    locationList.setAdapter(adapter);

 // Creating JSON Parser instance
    JSONParser jParser = new JSONParser();

 // getting JSON string from URL
    JSONObject json = jParser.getJSONFromUrl(url);

    try 
     // Getting Array of Category
    location=json.getJSONArray(TAG_LOCATION);

    //looping through all categories
    for(int i = 0; i < location.length(); i++)
        JSONObject c = location.getJSONObject(i);
        JSONObject c1=c.getJSONObject(TAG_LOCATION1);

        // Storing each json item in variable
            String LocationID = c1.getString(TAG_LOCATION_ID);
            String Name = c1.getString(TAG_NAME);
            String Phone = c1.getString(TAG_PHONE);
            String FormattedPhone = c1.getString(TAG_FORMATTED_PHONE);
            String Address = c1.getString(TAG_ADDRESS);
            String CrossStreet = c1.getString(TAG_CROSS_STREET);
            String Lat = c1.getString(TAG_LAT);
            String Lng = c1.getString(TAG_LNG);
            String Distance = c1.getString(TAG_DISTANCE);
            String PostalCode = c1.getString(TAG_POSTAL_CODE);
            String City = c1.getString(TAG_CITY);
            String State = c1.getString(TAG_STATE);
            String Country = c1.getString(TAG_COUNTRY);

        // creating new HashMap
           HashMap<String, String> map = new HashMap<String, String>();

        // adding each child node to HashMap key => value
           map.put(TAG_LOCATION_ID, LocationID);
           map.put(TAG_NAME, Name);
           map.put(TAG_PHONE, Phone);
           map.put(TAG_FORMATTED_PHONE, FormattedPhone);
           map.put(TAG_ADDRESS, Address);
           map.put(TAG_CROSS_STREET, CrossStreet);
           map.put(TAG_LAT, Lat);
           map.put(TAG_LNG, Lng);
           map.put(TAG_DISTANCE, Distance); 
           map.put(TAG_POSTAL_CODE, PostalCode);
           map.put(TAG_CITY, City);
           map.put(TAG_STATE, State);
           map.put(TAG_COUNTRY, Country);

           // adding HashList to ArrayList
           locationOfList.add(map);
    
     catch (Exception e) 
        // TODO: handle exception
        e.printStackTrace();
    

    locationList.setOnItemClickListener(new OnItemClickListener() 

        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position,
                long id) 
            // TODO Auto-generated method stub

             // getting values from selected ListItem
            String Name = ((TextView) view.findViewById(R.id.name)).getText().toString();
            String Distance = ((TextView) view.findViewById(R.id.distance_list1)).getText().toString();
            String Country = ((TextView) view.findViewById(R.id.country_list1)).getText().toString();
            String City = ((TextView) view.findViewById(R.id.city_list1)).getText().toString();
            String Phone = ((TextView) view.findViewById(R.id.phone_list1)).getText().toString();

         // Starting new intent
            Intent in = new Intent(getApplicationContext(), LocationDetails.class);
            in.putExtra(TAG_NAME, Name);
            in.putExtra(TAG_DISTANCE, Distance);
            in.putExtra(TAG_COUNTRY, Country);
            in.putExtra(TAG_CITY, City);
            in.putExtra(TAG_PHONE, Phone);

            startActivity(in);
        
    );


public class LocationDetails extends Activity

// JSON node keys
    private static final String TAG_NAME = "Name";
    private static final String TAG_PHONE = "Phone";
    private static final String TAG_ADDRESS = "Address";
    private static final String TAG_DISTANCE= "Distance";
    private static final String TAG_CITY = "City";
    private static final String TAG_COUNTRY= "Country";

    private TextView name,phone,address,distance,city,country;

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

        // getting intent data
        Intent in = getIntent();

        // Get JSON values from previous intent
        String Name = in.getStringExtra(TAG_NAME);
        String Phone = in.getStringExtra(TAG_PHONE);
        String Address = in.getStringExtra(TAG_ADDRESS);
        String Distance = in.getStringExtra(TAG_DISTANCE);
        String City = in.getStringExtra(TAG_CITY);
        String Country = in.getStringExtra(TAG_COUNTRY);

        // Displaying all values on the screen
        name= (TextView) findViewById(R.id.TxtView_name);
        phone=(TextView)findViewById(R.id.TxtView_PhoneField);
        address=(TextView)findViewById(R.id.TxtView_AddressField);
        distance=(TextView)findViewById(R.id.TxtView_DistanceField);
        city=(TextView)findViewById(R.id.TxtView_CityField);
        country=(TextView)findViewById(R.id.TxtView_CountryField);

        name.setText(Name);
        phone.setText(Phone);
        address.setText(Address);
        distance.setText(Distance);
        city.setText(City);
        country.setText(Country);
    

【问题讨论】：

你遇到了什么问题？

我写在顶部实际上我可以获取列表视图项目，但是当我点击它时，我希望与该名称相关，它会显示电话号码等详细信息。 ，距离，所有国家/地区。

【参考方案1】：

在发送活动时，尝试替换

in.putExtra(TAG_NAME, Name);
in.putExtra(TAG_DISTANCE, Distance);
in.putExtra(TAG_COUNTRY, Country);
in.putExtra(TAG_CITY, City);
in.putExtra(TAG_PHONE, Phone);

与

Bundle extras = new Bundle();
extras.putString(TAG_NAME, Name);
extras.putString(TAG_DISTANCE, Distance);
extras.putString(TAG_COUNTRY, Country);
extras.putString(TAG_CITY, City);
extras.putString(TAG_PHONE, Phone);
extras.putExtras(extras);

在接收活动中，尝试替换

// getting intent data
        Intent in = getIntent();

        // Get JSON values from previous intent
        String Name = in.getStringExtra(TAG_NAME);
        String Phone = in.getStringExtra(TAG_PHONE);
        String Address = in.getStringExtra(TAG_ADDRESS);
        String Distance = in.getStringExtra(TAG_DISTANCE);
        String City = in.getStringExtra(TAG_CITY);
        String Country = in.getStringExtra(TAG_COUNTRY);

与

Bundle extras = getIntent().getExtras();

if(extras != null) 

    String Name = extras.getString(TAG_NAME);
    String Phone = extras.getString(TAG_PHONE);
    String Address = extras.getString(TAG_ADDRESS);
    String Distance = extras.getString(TAG_DISTANCE);
    String City = extras.getString(TAG_CITY);
    String Country = extras.getString(TAG_COUNTRY);  

【参考方案2】：

您正在尝试从 TextViews 中获取数据，这完全不对。

您需要在 listItem 的 onClick() 中使用 locationOfList(position) 从 ArrayList 中获取所选项目的值。

类似这样的：

 locationList.setOnItemClickListener(new OnItemClickListener() 

    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position,
            long id) 
        // TODO Auto-generated method stub

        // getting values from selected ListItem
        HashMap<String, String> selectedMap =  locationOfList.get(position);           

     // Starting new intent
        Intent in = new Intent(getApplicationContext(), LocationDetails.class);
        in.putExtra(selectedMap);

        startActivity(in);
    
);

在您的第二个 Activity 中，使用 this example 从 HashMap 中检索数据。

【讨论】：

我不明白你是否能够做你试图向我解释的事情，那么我感谢你@swayam

在您的代码中，您试图通过使用 TextViews 的内容来获取已单击项目的数据。那是错的。您需要识别已单击的元素，然后查看您的 arrayList 以找到该位置的地图并从那里提取信息。我希望我说得通。

如果我知道该怎么做，我不会在这里问你是否给我一个代码，你可以解释我在上面的代码中所做的更改，那么它会更好。

当我使用您的代码时，它在 locationOfList 上显示一个错误，“无法引用以不同方法定义的内部类中的非最终变量 locationOfList”，所以下一步该做什么。 @swayam

是的，那是因为您已经在 onCreate() 中声明了它。将其声明为全局类变量，即不在任何函数内。