Android组合式自定义控件实现购物车加减商品操作

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();        }      });    }  }

<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>

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;  }}

<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>