public class MyAddSubView extends LinearLayout implements View.OnClickListener {
private int number = 1;
private TextView tv_sub;
private TextView tv_number;
private TextView tv_add;
public MyAddSubView(Context context) {
this(context, null);
}
public MyAddSubView(Context context, @Nullable AttributeSet attrs) {
this(context, attrs, 0);
}
public MyAddSubView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
View view = inflate(context, R.layout.add_remove, this);
tv_sub = view.findViewById(R.id.tv_sub);
tv_number = view.findViewById(R.id.tv_number);
tv_add = view.findViewById(R.id.tv_add);
tv_sub.setOnClickListener(this);
tv_add.setOnClickListener(this);
}
@Override
public void onClick(View v) {
switch (v.getId()){
case R.id.tv_sub:
if (number > 1){
--number;
tv_number.setText(number + "");
if (onNumberChangeListener != null){
onNumberChangeListener.onNumberChange(number);
}
}else {
Toast.makeText(getContext(), "不能再少了!", Toast.LENGTH_SHORT).show();
}
break;
case R.id.tv_add:
++number;
tv_number.setText(number + "");
if (onNumberChangeListener != null){
onNumberChangeListener.onNumberChange(number);
}
break;
}
}
public int getNumber(){
return number;
}
public void setNumber(int number) {
this.number = number;
tv_number.setText(number+"");
}
interface OnNumberChangeListener {
void onNumberChange(int num);
}
public void setOnNumberChangeListener(OnNumberChangeListener onNumberChangeListener) {
this.onNumberChangeListener = onNumberChangeListener;
}
private OnNumberChangeListener onNumberChangeListener;
}
.add_remove.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="60dp"
android:layout_height="30dp"
android:layout_gravity="center_vertical">
<TextView
android:background="#dedbdb"
android:id="@+id/tv_sub"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:gravity="center"
android:text="-"
android:textSize="16sp" />
<TextView
android:id="@+id/tv_number"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:gravity="center"
android:text="1"
/>
<TextView
android:background="#dedbdb"
android:id="@+id/tv_add"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:gravity="center"
android:text="+"
android:textSize="16sp" />
</LinearLayout>