Question

我不知道如何通过单击基于listview的下一个/上一个按钮来显示下一个/上一个详细数据的功能。

这是我想要的截图

My Detail data Activity，显示listview的下一个/上一个数据

编辑：我有一个listview数据（使用xml解析器），并将数据传递给名为“Detail_toko.class”的新活动：

                List<NameValuePair> paramemeter = new ArrayList<NameValuePair>();
                paramemeter.add(new BasicNameValuePair("keyword", "a"));  
                // paramemeter.add(new BasicNameValuePair("kategori",Category.getSelectedItem().toString()));

                XMLParser parser = new XMLParser();
                String xml = parser.getXmlFromUrl(URL, paramemeter); // getting XML from URL
                Document doc = parser.getDomElement(xml); // getting DOM element
                NodeList nl = doc.getElementsByTagName(TAG_DETAIL);
                // looping through all song nodes <song>
                for (int i = 0; i < nl.getLength(); i++) {
                    // creating new HashMap
                    HashMap<String, String> map = new HashMap<String, String>();
                    Element e = (Element) nl.item(i);
                    // adding each child node to HashMap key => value
                    map.put(TAG_ID, parser.getValue(e, TAG_ID));
                    map.put(TAG_NAMATOKO, parser.getValue(e, TAG_NAMATOKO));
                    map.put(TAG_KATEGORI, parser.getValue(e, TAG_KATEGORI));
                    map.put(TAG_EMAIL, parser.getValue(e, TAG_EMAIL));
                    map.put(TAG_ICON, parser.getValue(e, TAG_ICON));


                    // adding HashList to ArrayList
                    PremiumList.add(map);



                        } 

            return null;

           }


            /**
             * Updating parsed JSON data into ListView
             * */
            list=(ListView)findViewById(R.id.listview);

            if(PremiumList.size() > 0)
                    {

                adapter=new LazyAdapterStore(ListPerusahaan.this, PremiumList);        
                list.setAdapter(adapter);
            }

            else
                    {
                Toast toast= Toast.makeText(getApplicationContext(), "No data found, enter another keyword", Toast.LENGTH_SHORT);  
                    toast.setGravity(Gravity.CENTER_VERTICAL|Gravity.CENTER_HORIZONTAL, 0, 0);
                    toast.show();
                    }

                // Click event for single list row
                    list.setOnItemClickListener(new OnItemClickListener() {

                        @Override
                        public void onItemClick(AdapterView<?> parent, View view,
                                int position, long id) {

                            // getting values from selected ListItem
                            String nama_toko = ((TextView) view.findViewById(R.id.nama_toko)).getText().toString();
                            String kategori = ((TextView) view.findViewById(R.id.kategori)).getText().toString();
                            String email = ((TextView) view.findViewById(R.id.email)).getText().toString();



                         PremiumList = new ArrayList<HashMap<String, String>>();
                         Intent in = new Intent(ListPerusahaan.this, Detail_toko.class); 
                         in.putExtra("PremiumList", PremiumList);
                         //in.putStringArrayListExtra( "PremiumList", PremiumList );
                         in.putExtra("position", position);
                         in.putExtra("TotalData", TotalData);
                         in.putExtra(TAG_NAMATOKO, nama_toko);
                         in.putExtra(TAG_KATEGORI, kategori);
                         in.putExtra(TAG_EMAIL, email);
                         startActivity(in);

这是我的LazyAdapterStore代码：

  public View getView(int position, View convertView, ViewGroup parent) {
    View vi=convertView;
    if(convertView==null)
        vi = inflater.inflate(R.layout.list_data_store, null);

    TextView nama_toko = (TextView)vi.findViewById(R.id.nama_toko); // title
    TextView kategori = (TextView)vi.findViewById(R.id.kategori); // title
    ImageView thumb_image=(ImageView)vi.findViewById(R.id.list_image); // thumb image
    TextView email = (TextView)vi.findViewById(R.id.email); // artist name


    HashMap<String, String> detail = new HashMap<String, String>();
    detail = data.get(position);


    // Setting all values in listview
    nama_toko.setText(detail.get(ListPerusahaan.TAG_NAMATOKO));
    kategori.setText(detail.get(ListPerusahaan.TAG_KATEGORI));
    email.setText(detail.get(ListPerusahaan.TAG_EMAIL));
    imageLoader.DisplayImage(detail.get(ListPerusahaan.TAG_ICON), thumb_image);
    return vi;

}

编辑：，这是我的新活动“Detail_Toko”，用于显示listview项目的详细数据：

@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

  //this must be called BEFORE setContentView
    requestWindowFeature(Window.FEATURE_CUSTOM_TITLE);

    setContentView(R.layout.detail_toko);

    getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE, R.layout.window_title);

    call_btn=(Button)findViewById(R.id.call);

    email_btn=(Button)findViewById(R.id.email);

    sms_btn=(Button)findViewById(R.id.sms);

    Next_btn=(Button)findViewById(R.id.Next);

    Prev_btn=(Button)findViewById(R.id.Prev);

    phonenumber=(TextView)findViewById(R.id.telpon);


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

   // @SuppressWarnings("unchecked")
    //ArrayList<HashMap<String, String>> PremiumList = (ArrayList<HashMap<String, String>>) getIntent().getSerializableExtra("PremiumList");


    // Get String values from previous intent
    final String nama_toko = in.getStringExtra(TAG_NAMATOKO);
    final String kategori = in.getStringExtra(TAG_KATEGORI);
    final String email = in.getStringExtra(TAG_EMAIL);

    // Get Int values from previous intent
    final int posisi =  in.getExtras().getInt("position");
    final int Total_data =  in.getExtras().getInt("TotalData");

   /*
    Bundle bundle = in.getExtras(); 
    HashMap<String, String> list = (HashMap<String, String>) bundle.getSerializable("PremiumList");
    list = data.get(currentposition);
    */

    Bundle bundle = in.getExtras();
    HashMap<String, String> list =  (HashMap<String, String>) bundle.getSerializable("PremiumList");
    list = data.get(currentposition);

    // Displaying all values on the screen
    lblPosisi = (TextView) findViewById(R.id.namatoko);
    lbltotaldata = (TextView) findViewById(R.id.nama);
    lblNamatoko = (TextView) findViewById(R.id.nama_toko);
    lblKategori = (TextView) findViewById(R.id.kategori);
    lblEmail = (TextView) findViewById(R.id.textemail);

    lblPosisi.setText(String.valueOf(posisi));
    lbltotaldata.setText(String.valueOf(Total_data));
    lblNamatoko.setText(nama_toko);
    lblKategori.setText(kategori);
    lblEmail.setText(email);


    // Set the int value of currentposition from previous selected listview item
    currentposition = posisi;

    Next_btn.setOnClickListener(new Button.OnClickListener(){
      public void onClick(View v){  

          if(currentposition >= Total_data - 1)
          {
              Toast toast= Toast.makeText(getApplicationContext(), "Last Record", Toast.LENGTH_SHORT);  
              toast.setGravity(Gravity.CENTER_VERTICAL|Gravity.CENTER_HORIZONTAL, 0, 0);
              toast.show();
          }
          else
          {

              currentposition++;
              lblPosisi.setText(String.valueOf(currentposition));
              lblNamatoko.setText(list.get(nama_toko));
              lblKategori.setText(list.get(kategori));
              lblEmail.setText(list.get(email));


          }
        }
      });


    Prev_btn.setOnClickListener(new Button.OnClickListener(){
      public void onClick(View v){  

          if(currentposition <= 0)
          {
              Toast toast= Toast.makeText(getApplicationContext(), "First Record", Toast.LENGTH_SHORT);  
              toast.setGravity(Gravity.CENTER_VERTICAL|Gravity.CENTER_HORIZONTAL, 0, 0);
              toast.show();
          }
          else
          {
              currentposition--;
              lblPosisi.setText(String.valueOf(currentposition));
              lblNamatoko.setText(list.get(nama_toko));
              lblKategori.setText(list.get(kategori));
              lblEmail.setText(list.get(email));
          }


          }
     });

问题是，我不知道如何通过单击“Detail_toko”活动中的下一个/上一个按钮来创建一个函数来显示listview中的下一个/上一个详细数据。请有人帮助我......

提前感谢

Answer 1

刚刚在上一篇文章中看到了您的请求。

Parvaz提供的解决方案非常完美，您只需要弄清楚代码。你有一个arraylist“PremiumList”，它负责你的listview行数据。您所需要的只是将位置和此列表传递给Detail_toko.class（通过意图使用parceable或声明arraylist作为静态（不推荐）等）并且您的解决方案将在几步之后。

在Detail_toko.class中创建一个全局变量currentPosition，它将从意图的TAG_NAMATOKO过去的活动中获取其值。然后在NEXT按钮的onClickListener中将1递增到currentPosition，并从刚刚从上一个活动传输的arraylist获取详细信息，就像在getView方法中一样。

 HashMap<String, String> detail = new HashMap<String, String>();
    detail = data.get(currentPosition);


// Setting all values in listview
nama_toko = detail.get(ListPerusahaan.TAG_NAMATOKO);
kategori = detail.get(ListPerusahaan.TAG_KATEGORI);
email = detail.get(ListPerusahaan.TAG_EMAIL);

设置这些值，您的新视图将相应更新。

在PREVIOUS按钮的onClickListener中，从currentPosition减少1，后跟相同的代码（这意味着你必须创建一个方法并调用它，不重复代码）。

试试吧。这是我们可以解释的详细信息，而不是实际做功课！

编辑：

首先从OnItemClick

中删除此行

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

您正在清除此行中PremiumList的所有数据，这样您将在下一个活动中获得空白列表。所以摆脱这条线。一旦你在下一个活动中获得PremiumList，你需要的就是位置和totalData以及额外的intent。您可以从额外的意图中删除TAG_NAMATOKO，TAG_KATEGORI，TAG_EMAIL。

我曾告诉过你不要重复这段代码，因为你是初学者，因为它会让你的生活变得轻松，因此非常重要。采取这些考虑并使你的习惯。

现在，“Detail_Toko”中的代码将变为：

 HashMap<String, String> list = null;
 int currentposition = 0;
 int  Total_data =0;

 @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

  //this must be called BEFORE setContentView
    requestWindowFeature(Window.FEATURE_CUSTOM_TITLE);

    setContentView(R.layout.detail_toko);

    getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE, R.layout.window_title);

    call_btn=(Button)findViewById(R.id.call);

    email_btn=(Button)findViewById(R.id.email);

    sms_btn=(Button)findViewById(R.id.sms);

    Next_btn=(Button)findViewById(R.id.Next);

    Prev_btn=(Button)findViewById(R.id.Prev);

    phonenumber=(TextView)findViewById(R.id.telpon);

// Displaying all values on the screen
    lblPosisi = (TextView) findViewById(R.id.namatoko);
    lbltotaldata = (TextView) findViewById(R.id.nama);
    lblNamatoko = (TextView) findViewById(R.id.nama_toko);
    lblKategori = (TextView) findViewById(R.id.kategori);
    lblEmail = (TextView) findViewById(R.id.textemail);

    // getting intent data
   Bundle bundle = getIntent().getExtras();
// Get Int values from previous intent
    currentposition =  bundle.getInt("position");
      Total_data =  bundle.getInt("TotalData");
    list =  (HashMap<String, String>) bundle.get("PremiumList");
    setView();
    Next_btn.setOnClickListener(new Button.OnClickListener(){
      public void onClick(View v){  
        if(currentposition >= Total_data - 1)
          {
              Toast toast= Toast.makeText(getApplicationContext(), "Last Record", Toast.LENGTH_SHORT);  
              toast.setGravity(Gravity.CENTER_VERTICAL|Gravity.CENTER_HORIZONTAL, 0, 0);
              toast.show();
          }
          else
          {
             currentposition++;
             setView();
          }
        }
      });


    Prev_btn.setOnClickListener(new Button.OnClickListener(){
      public void onClick(View v){  

          if(currentposition <= 0)
          {
              Toast toast= Toast.makeText(getApplicationContext(), "First Record", Toast.LENGTH_SHORT);  
              toast.setGravity(Gravity.CENTER_VERTICAL|Gravity.CENTER_HORIZONTAL, 0, 0);
              toast.show();
          }
          else
          {
              currentposition--;
              setView();
          }
        }
     });

     private void setView()
     {
     if(list != null && list.size() > currentposition)
     {
     HashMap<String, String> detail = new HashMap<String, String>();
    detail = list.get(currentposition);
     lblPosisi.setText(String.valueOf(currentposition));
    lbltotaldata.setText(String.valueOf(Total_data));
    lblNamatoko.setText(detail.get(ListPerusahaan.TAG_NAMATOKO));
    lblKategori.setText(detail.get(ListPerusahaan.TAG_KATEGORI));
    lblEmail.setText(detail.get(ListPerusahaan.TAG_EMAIL));
    }
    }

建议：使用ViewHolder在getView方法中填充视图，它将使您的适配器成为“一个高效的适配器”。（搜索示例）遵循命名约定和所有。在使用它们之前检查anyObject！= null，它们的大小或长度以及bundle.containKey等东西，以避免像nullPointerException这样的致命异常。

Answer 2

只需将PremiumList ArrayList传递给您的Detail_toko活动...或者通过Intent传递它，或者直接从getter方法获取它。然后在每个下一个/上一个按钮的Detail_toko活动中，单击增加arraylist的位置以获取数据，然后相应地填充。

这是你传递arraylist的方法 Passing ArrayList through Intent

而不是从intent获取其余数据而不是从arraylist获取数据。

喜欢arraylist.get（index）。

就像这样

  /********Instead of getting your values like this*******************/
String nama_toko = in.getStringExtra(TAG_NAMATOKO);
String kategori = in.getStringExtra(TAG_KATEGORI);
String email = in.getStringExtra(TAG_EMAIL);

/ ************************使用此处给出的方法How to do the next button action? *********** ***************** /

  //The  method setvalue would be quite useful for you where you will pass the int j parameter to get appropriate values. If next button is clicked increment the j if previous button is clicked decrement it. and then display your values asusual.
// Displaying all values on the screen
lblNamatoko = (TextView) findViewById(R.id.namatoko);
lblKategori = (TextView) findViewById(R.id.kategori);
lblEmail = (TextView) findViewById(R.id.textemail);

lblNamatoko.setText(nama_toko);
lblKategori.setText(kategori);
lblEmail.setText(email);

从listview获取下一个和上一个详细数据

2 个答案: