android - setText 从 ListView 项目到 TextView(在 ListView 之外)

Question

无法从 LISTITEM 访问 TextView (在 LISTITEM/LISTVIEW 之外)

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正如您在图片中看到的，我想通过列表项中的按钮更改 TextView 的值(当前值为“Rs.97”)。(即“+”和“-”按钮)

这里是我的代码:

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Answer 1

Make an interface like :

   public interface ChangeItemInterface {

        public void doChange(String anyValue);

    }

在适配器中，

Intialize interface object like :

ChangeItemInterface changeItemInterface;

In Adapter Constructor,

this.changeItemInterface = context;

In Adapter, From any View Click :

AnyView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                 this.changeItemInterface.doChange("AnyValue");
                 // It will go to the Your Activity Overided method which is explained below this


            }
        });

In Your Activity implement this interface like :

     public class YourActivity extends Activity implements ChangeItemInterface{

        /// You'll get override method of your interface, here your call back will come when from adapter click happen
         @Override
            public void doChange(String anyValue) {

              /// Here you can update any value in your activity !
            }

        }

希望这能帮助您解决问题!