我创建了一个展开布局的 ListView 。膨胀的布局有一个 edittext 和两个按钮，用于增加和减少 edittext 中的值。但问题是，如果我更改 ListView 中第一个编辑文本的值，更改会反射(reflect)在 ListView 的第四个编辑文本(第四个子项)中。同样，第二个 edittext 的变化反射(reflect)到第五个 edittext 等等。我编写的用于在 ListView 中扩充布局的代码如下所示。请帮助我解决问题。
public class DisplayList extends AppCompatActivity {
private static final String TAG_CATEGORY = "main_name";
private static final String TAG_SUBCAT = "cat_name";
private static final String TAG_CODE = "code";
private static final String TAG_NAME = "name";
private static final String TAG_RATE = "rate";
private static final String TAG_RATE2 = "rate2";
private static final String TAG_RATE3 = "rate3";
private static final String TAG_IMAGE = "img";
ImageAdapter mImageAdapter = null;
ListView mListView = null;
DatabaseHelper myDb;
FloatingActionButton fab1;
public ArrayList<DetailsVO> mListDetails = new ArrayList<DetailsVO>();
String subc;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_display_list);
myDb=new DatabaseHelper(DisplayList.this);
fab1 = (FloatingActionButton) findViewById(R.id.fab);
fab1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent=new Intent(DisplayList.this,NewCart.class);
startActivity(intent);
}
});
mListView = (ListView) findViewById(R.id.list_view);
Bundle extras = getIntent().getExtras();
if (extras != null) {
subc = extras.getString("Subcat");
}
new AsyncCallSoap1().execute();
}
public class AsyncCallSoap1 extends AsyncTask<String,Void,String> {
private final ProgressDialog dialog=new ProgressDialog(DisplayList.this);
@Override
protected String doInBackground(String... params) {
CallSoap com=new CallSoap();
String SOAP_ACTION="http://tempuri.org/IprotechService/SelectSuCatgeory";
String OPERATION_NAME="SelectSuCatgeory";
String response = com.getDetails(OPERATION_NAME,SOAP_ACTION);
if(response!=null){
try {
JSONArray array1 = new JSONArray(response);
for(int i=0;i<array1.length();i++)
{
final DetailsVO detailsVO = new DetailsVO();
JSONObject obj1 = array1.getJSONObject(i);
String out_category = obj1.getString(TAG_CATEGORY);
String out_subcat = obj1.getString(TAG_SUBCAT);
String out_code = obj1.getString(TAG_CODE);
String out_name = obj1.getString(TAG_NAME);
String out_rate = obj1.getString(TAG_RATE);
String out_rate2 = obj1.getString(TAG_RATE2);
String out_rate3 = obj1.getString(TAG_RATE3);
String out_img = obj1.getString(TAG_IMAGE);
if(subc.equalsIgnoreCase(out_subcat)){
detailsVO.setImage(out_img);
detailsVO.setName(out_name);
detailsVO.setRate(out_rate);
detailsVO.setRate2(out_rate2);
detailsVO.setRate3(out_rate3);
mListDetails.add(detailsVO);}
}
} catch (JSONException e) {
e.printStackTrace();
}
}
return response;
}
@Override
protected void onPreExecute() {
super.onPreExecute();
//Showing progress dialog
dialog.setMessage("Please wait...");
dialog.setCancelable(false);
dialog.show();
}
@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
dialog.dismiss();
if(mListDetails != null){
mImageAdapter = new ImageAdapter(DisplayList.this, mListDetails);
mListView.setAdapter(mImageAdapter);
}
}
}
public class ImageAdapter extends BaseAdapter {
private Context mContext;
private ArrayList<DetailsVO> mItems;
private ArrayList<DetailsVO> mOriginalItems;
public ImageAdapter(Context context, ArrayList<DetailsVO> items) {
this.mContext = context;
this.mItems = items;
}
@Override
public int getCount() {
return mItems.size();
}
@Override
public DetailsVO getItem(int position) {
return mItems.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
public ArrayList<DetailsVO> getItems(){
return mItems;
}
public View getView(int position, View convertView, ViewGroup parent) {
if (convertView == null) {
LayoutInflater mInflater = (LayoutInflater) mContext.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
convertView = mInflater.inflate(R.layout.row_layout, null);
}
DetailsVO detailsVO = mItems.get(position);
View listView = (View) convertView;
ImageView image = (ImageView) listView.findViewById(R.id.imageView2);
final TextView textTitle = (TextView) listView.findViewById(R.id.textView2);
final Spinner spinner=(Spinner) listView.findViewById(R.id.spinner);
Button btnplus = (Button) listView.findViewById(R.id.max);
Button btnminus = (Button) listView.findViewById(R.id.min);
final Button btnadd=(Button) listView.findViewById(R.id.btn_add);
btnadd.setClickable(true);
final TextView quantity = (TextView) listView.findViewById(R.id.quantity);
ArrayList<String> rate=new ArrayList<String>();
rate.add("Rs."+detailsVO.getRate());
if(detailsVO.getRate2()!= null && !detailsVO.getRate2().isEmpty())
{
rate.add("Rs."+detailsVO.getRate2());
}
if(detailsVO.getRate3()!= null && !detailsVO.getRate3().isEmpty())
{
rate.add("Rs."+detailsVO.getRate3());
}
ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(DisplayList.this, android.R.layout.simple_spinner_item,rate);
dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setAdapter(dataAdapter);
spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
String item = parent.getItemAtPosition(position).toString();
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
btnminus.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
String value = quantity.getText().toString();
int quantity1 = Integer.parseInt(value);
if(quantity1>0)
{
quantity1 = quantity1 -1;
String t = Integer.toString(quantity1);
quantity.setText(t);
}
}
});
btnplus.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
String value1 = quantity.getText().toString();
int quantity2 = Integer.parseInt(value1);
quantity2 = quantity2 + 1;
String t=Integer.toString(quantity2);
quantity.setText(t);
}
});
final String u=detailsVO.getImage();
btnadd.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
String im="http://protech.absoftwaresolution.com/img/grocery_imgs/grains/"+u;
String nm = textTitle.getText().toString();
String value = quantity.getText().toString();
int q= Integer.parseInt(value);
String rate=spinner.getSelectedItem().toString();
String val = rate.substring(rate.lastIndexOf("-")- 1);
final String val1=rate.substring(3,rate.lastIndexOf("-"));
int b = Integer.parseInt(val1.trim());
final int a= q*b;
String c=Integer.toString(a);
boolean isInserted = myDb.insertData(im,nm,val1,q,a);
if (isInserted == true) {
Toast.makeText(DisplayList.this, "Item Added Successfully!!!", Toast.LENGTH_LONG).show();
}
}
});
Picasso.with(mContext)
.load("http://protech.absoftwaresolution.com/img/grocery_imgs/grains/"+detailsVO.getImage())
.placeholder(R.drawable.placeholder)
.into(image);
textTitle.setText(detailsVO.getName());
return listView;
}
}
当我单击 btnplus 和 btnminus 时，我正在更改反射(reflect)在 ListView 中第四个下一个编辑文本中的编辑文本值
最佳答案
我认为这是因为您的监听器是在 getView() 中声明的。当您上下滚动时，ListView 会回收 View 及其引用。基本上，当您单击第一行中的某个内容时，ListView 会将这些引用更改为其他某个对象。如果没有 View ID 或标签来跟踪它，这些点击就会转移到其他地方。
我尝试解决此问题的方法是在适配器外部为您的 ListView 项目声明一个 OnItemClickListener。在里面，检测哪个 subview (按钮+/-)被点击，然后相应地调整你的字符串。一旦你有对容器/ViewGroup 的引用，你应该被设置...
关于android - 反射(reflect)在其他 ListView 子布局中的 ListView 的一个子布局的更改，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/38692386/