package com.example.shoppingcart.view.activity; import android.content.Context; import android.util.AttributeSet; import android.view.View; import android.widget.LinearLayout; import android.widget.TextView; import android.widget.Toast; import com.example.shoppingcart.R; public class AddAndRemove extends LinearLayout implements View.OnClickListener {
      private View view;     private TextView subtractor;     private TextView number;     private TextView add;     private int count = 1;     public AddAndRemove(Context context) {
          super(context);     }     public AddAndRemove(Context context, AttributeSet attrs) {
          super(context, attrs);         view = View.inflate(context, R.layout.addandremove, this);         initView();     }     private void initView() {
          subtractor = (TextView) view.findViewById(R.id.subtractor);         number = (TextView) view.findViewById(R.id.number);         add = (TextView) view.findViewById(R.id.add);         subtractor.setOnClickListener(this);         add.setOnClickListener(this);     }     @Override     public void onClick(View v) {
          switch (v.getId()) {
              case R.id.subtractor:                 if (count>1){
                      count--;                     number.setText(count+"");

　　　　　　　　　　//点击改变之后，用接口回调传值

if (onNumberChangeListener!=null){
                          onNumberChangeListener.changed(count);                     }                 }else {
                      Toast.makeText(getContext(), "不能再少了呢", Toast.LENGTH_SHORT).show();                 }                 break;             case R.id.add:                 count++;                 number.setText(count+""); 　　　　　　　　　　//点击改变之后，用接口回调传值                 if (onNumberChangeListener != null){
                      onNumberChangeListener.changed(count);                 }                 break;         }     }     public interface OnNumberChangeListener{
          void changed(int num);     }     OnNumberChangeListener onNumberChangeListener;     public void setOnNumberChangeListener(OnNumberChangeListener onNumberChangeListener){
          this.onNumberChangeListener = onNumberChangeListener;     }     public int getNumber(){
          return count;     }     public void setCount(int num){
          count = num;         number.setText(count+"");     } }