Android组合式自定义控件实现购物车加减商品操作

本文实例为大家分享了android实现购物车加减商品操作的具体代码，供大家参考，具体内容如下

mainactivity.java

public class mainactivity extends appcompatactivity {

    private addand maddand;
  
    @override
    protected void oncreate(bundle savedinstancestate) {
      super.oncreate(savedinstancestate);
      setcontentview(r.layout.activity_main);
      maddand= findviewbyid(r.id.add);
  
      maddand.setonnumberchangedlistener(new addand.onnumberchangedlistener() {
        @override
        public void onnumberchanged(int vs) {
          toast.maketext(mainactivity.this, vs+"", toast.length_short).show();
        }
      });
    }
  }

activity_main.xml

<android.support.constraint.constraintlayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:app="http://schemas.android.com/apk/res-auto"
  xmlns:tools="http://schemas.android.com/tools"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  tools:context=".mainactivity"
  android:orientation="horizontal">

  <fanruiqi.www.com.jia.addand
    android:id="@+id/add"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"/>

</android.support.constraint.constraintlayout>

addand.java

public class addand extends framelayout implements view.onclicklistener{
  private imageview mimage1;
  private imageview mimage2;
  private textview mtext;
  int value;

  public addand(@nonnull context context) {
    this(context,null);
  }

  public addand(@nonnull context context, @nullable attributeset attrs) {
    this(context, attrs,0);
  }

  public addand(@nonnull context context, @nullable attributeset attrs, int defstyleattr) {
    super(context, attrs, defstyleattr);

    findview(context);
  }

  private void findview(context context) {
    view view = view.inflate(context, r.layout.add, this);

     mimage1 =view.findviewbyid(r.id.image1);
     mimage2 = view.findviewbyid(r.id.image2);
     mtext = view.findviewbyid(r.id.text);

     value=getvalue();

     setvalue(value);

     mimage1.setonclicklistener(this);
     mimage2.setonclicklistener(this);
  }
  private int vs=1;
  public int getvalue() { //获取值

    string trim = mtext.gettext().tostring().trim();
    if (!textutils.isempty(trim)){
      integer.valueof(vs);
    }
    return vs;
  }

  public void setvalue(int value) {
    mtext.settext(value+"");
  }

  @override
  public void onclick(view view) {

    switch (view.getid()){
      case r.id.image1:
        add();
        break;
      case r.id.image2:
        jian();
        break;
    }
  }

  private void jian() {
    if (vs>1){
      vs--;
      setvalue(vs);
    }

    monnumberchangedlistener.onnumberchanged(vs);
  }

  private void add() {

    if (vs<6){
      vs++;
      setvalue(vs);
    }

    monnumberchangedlistener.onnumberchanged(vs);
  }

  public interface onnumberchangedlistener{
    void onnumberchanged(int vs);
  }

  private onnumberchangedlistener monnumberchangedlistener;

  public void setonnumberchangedlistener(onnumberchangedlistener onnumberchangedlistener){
      monnumberchangedlistener=onnumberchangedlistener;
  }

}

add.xml

<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:orientation="horizontal">

  <imageview
    android:id="@+id/image1"
    android:layout_width="20dp"
    android:layout_height="20dp"
    android:src="@drawable/ic_launcher_background"/>

  <textview
    android:id="@+id/text"
    android:layout_width="50dp"
    android:layout_height="20dp"
    android:gravity="center"
    android:text="1"/>

  <imageview
    android:id="@+id/image2"
    android:layout_width="20dp"
    android:layout_height="20dp"
    android:src="@drawable/ic_launcher_background"/>
</linearlayout>

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。