如何在特定的位置添加文本自定义适配器的Android

Question

我创建Android应用程序填充这是由用户使用自定义适配器这样

SELECTION   LAT  LONG   DISTANCE 
------------------------------------------------- 
    checkbox1 123.4546  456.48751  Text 
    checkbox2 123.4546  456.48751  Text 
    checkbox3 123.4546  456.48751  Text 
    checkbox4 123.4546  456.48751  Text 

进入GPS坐标列表如果用户选择复选框1，那么我必须找到从复选框1 lat long到复选框2，复选框3，复选框4 lat的距离。在这里我需要显示结果文本的Text各自的立场，但在这里，我只是在最后的位置得到结果现场谁能告诉我如何FYI实现它：！[在这里输入的形象描述] [2] [2] 此SC将解释详细。 如果我入住的是一个价值也就只有在最后的值更新的结果，但我需要更新，并显示整个数据结果 这是我的代码

check_locations.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() { 
     @Override 
     public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { 
      if (isChecked) { 

       latitude_string = location.getLatitude(); 
       longitude_string = location.getLongitude(); 
       baseLat_double = Double.parseDouble(latitude_string); 
       baseLong_double = Double.parseDouble(longitude_string); 
       location_a = new Location("Base position"); 
       location_a.setLatitude(Double.parseDouble(latitude_string)); 
       location_a.setLongitude(Double.parseDouble(longitude_string)); 
       location_b = new Location("End position"); 
       for (int i = 0; i < objects.size(); i++) { 
        finalLat_double = Double.parseDouble(objects.get(i).getLatitude()); 
        finalLong_double = Double.parseDouble(objects.get(i).getLongitude()); 
        location_b.setLatitude(finalLat_double); 
        location_b.setLongitude(finalLong_double); 
        distance = location_a.distanceTo(location_b); 
        distance = distance * 1.609344; 
        objects.get(i).setDistance(String.valueOf(distance)); 
        } 
       notifyDataSetChanged(); 
       distance_text.setText(location.getDistance()); 

      } 
     } 
    }); 


    return locations_row; 
} 

Answer 1

修改您的getView()方法是这样的

@Override 
    public View getView(final int position, View convertView, final ViewGroup parent) { 

    final View locations_row = LayoutInflater.from(context).inflate(R.layout.layout_adapter_list_details, null); 
    final Locations_modle location = (Locations_modle) objects.get(position); 
    TextView text_cust_name = (TextView) locations_row.findViewById(R.id.txt_cust_name_heading); 
    TextView latitude = (TextView) locations_row.findViewById(R.id.txt_latitude); 
    latitude.setText(location.getLatitude()); 
    TextView longitude = (TextView) locations_row.findViewById(R.id.txt_longitude); 
    TextView distance_text = (TextView) locations_row.findViewById(R.id.txt_distance); 
    if (StringUtils.isEmpty(location.getDistance())) 
     distance_text.setText("DISTANCE"); 
    longitude.setText(location.getLongitude()); 
    text_cust_name.setText(location.getLocationName()); 
    CheckBox check_locations = (CheckBox) locations_row.findViewById(R.id.check_locations); 
    check_locations.setTag(position); 

    if (position == selectedPostion) { 
     check_locations.setChecked(true); 
    } else { 
     check_locations.setChecked(false); 
    } 
    check_locations.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() { 
     @Override 
     public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { 
      if (isChecked) { 

       selectedPostion = (int) buttonView.getTag(); 

       latitude_string = objects.get(selectedPostion).getLatitude(); 
       longitude_string = objects.get(selectedPostion).getLongitude(); 

       baseLat_double = Double.parseDouble(latitude_string); 
       baseLong_double = Double.parseDouble(longitude_string); 

       location_a = new Location("Base position"); 
       location_a.setLatitude(Double.parseDouble(latitude_string)); 
       location_a.setLongitude(Double.parseDouble(longitude_string)); 

       location_b = new Location("End position"); 


       for (int i = 0; i < objects.size(); i++) { 
        finalLat_double = Double.parseDouble(objects.get(i).getLatitude()); 
        finalLong_double = Double.parseDouble(objects.get(i).getLongitude()); 
        location_b.setLatitude(finalLat_double); 
        location_b.setLongitude(finalLong_double); 
        distance = location_a.distanceTo(location_b); 
        distance = distance * 1.609344; 
        objects.get(i).setDistance(distance); 
       } 
       Locations_Adapter.this.notifyDataSetChanged(); 
      } 
     } 
    }); 

    return locations_row; 
} 

Answer 2

检查你的XML布局你行ID是唯一的，并且您正在正确使用distance_text Textview对象。也许需要刷新for循环中的对象？

对我来说，你的这个代码是有点难以阅读，但你在哪里使用您的ViewGroup家长和查看convertView？从

@Override 
public View getView(final int position, View convertView, final ViewGroup parent) { 

对于我快速浏览你只让你(TextView) locations_row.findViewById(R.id.txt_distance);的1个实例，这是对你的看法的最后位置。确保它按照你的要求刷新。

Answer 3

您充气locations_row作为一个总的看法。这将每次创建一个新项目。您需要重新使用现有的项目。我的意思是：

if (convertView == null) { 
     convertView = LayoutInflater.from(context).inflate(R.layout.layout_adapter_list_details, parent, false); 
     holder = new ViewHolder(convertView); 
     convertView.setTag(holder); 
    } else { 
     holder = (ViewHolder) convertView.getTag(); 
    } 

你甚至没有使用任何的View convertView或final ViewGroup parent 所以，从搜索约ViewHolder模式的列表视图适配器开始。