如何反映相应TextViews中每行的更改值

Question

我正在开发一个应用程序，其中有一个ListViewin，其中ListView的每一行中都有一个Button和一个TextView。我想增加值并在TextView中的按钮单击行上显示它，但是当我点击按钮时，它将为每行单独递增值，但显示最后一行的TextView中的更改，而不管在任何行中单击的按钮。如何显示同一行的TextView的特定行的变化

这里是我的代码：

MainActivity.java

public class MainActivity extends AppCompatActivity implements MyAd.customButtonListener { 


    ListView lv; 

int q=0; 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 

    lv= (ListView) findViewById(R.id.list); 
     MyAd ma=new MyAd(this); 
     ma.setCustomButtonListner(this); 
     lv.setAdapter(ma); 

    } 


    @Override 
    public void onButtonClickListner(int position,TextView t) { 
     q=q+1; 
     t.setText(""+q); 
    } 
} 

MyAd.java

class MyAd extends BaseAdapter { 
    int q = 0, a[]; 
    List<ListItem> li = new ArrayList<>(); 
    Context c; 
    MyViewHolder mvh; 
    customButtonListener customListner; 


    MyAd(Context c) { 
     this.c = c; 
     Resources res = c.getResources(); 
     String title[] = res.getStringArray(R.array.title); 
     a = new int[title.length]; 


     for (int i = 0; i < title.length; i++) { 
      li.add(new ListItem(title[i])); 
     } 
    } 


    public interface customButtonListener { 
     void onButtonClickListner(int position, TextView t); 
    } 


    public void setCustomButtonListner(customButtonListener listener) { 
     this.customListner = listener; 
    } 


    @Override 
    public int getCount() { 
     return li.size(); 
    } 

    @Override 
    public Object getItem(int i) { 
     return i; 
    } 

    @Override 
    public long getItemId(int i) { 
     return i; 
    } 


    @Override 
    public View getView(final int position, View view, ViewGroup parent) { 
     View row = view; 


     if (row == null) { 

      LayoutInflater inflater = (LayoutInflater) c.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
      row = inflater.inflate(R.layout.list_item, parent, false); 
      mvh = new MyViewHolder(row); 

      row.setTag(mvh); 
     } else { 
      mvh = (MyViewHolder) row.getTag(); 
     } 


     ListItem sr = li.get(position); 
//String s=sr.title; 
     mvh.txt.setText(sr.title); 


     mvh.bt.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View view) { 
       q = a[position]; 

       q++; 

       a[position] = q; 
       mvh.quan.setText(String.valueOf(a[position])); 
       System.out.println("position:" + position + "-" + q); 
       System.out.println("array: " + Arrays.toString(a)); 
      } 
     }); 

     notifyDataSetChanged(); 
     return row; 
    } 


    class MyViewHolder { 
     TextView txt, quan; 
     Button bt; 

     MyViewHolder(View row) { 
      txt = row.findViewById(R.id.txt); 
      quan = row.findViewById(R.id.quan); 
      bt = row.findViewById(R.id.button); 
     } 
    } 

} 

ListItem.java

public class ListItem { 

    String title; 

    ListItem(String title) 
    { 
     this.title=title; 
    } 


} 

Answer 1

删除作为实例变量

MyViewHolder mvh; 

并作为局部变量声明内getView（） -

final MyViewHolder mvh; 

由于实例变量，MVH总是保持最后膨胀视图保持器和因此，最后一个可见项目总是更新。