Android 购物车加减功能的实现代码

Android 实现购物车加减功能，效果图如下所示：

public class adderView extends LinearLayout implements View.OnClickListener, TextWatcher {

  private int amount = 0; //购买数量
  private int goods_storage = Integer.MAX_VALUE; //商品库存

  private OnAmountChangeListener mListener;

  private EditText etAmount;
  private Button btnDecrease;
  private Button btnIncrease;

  public adderView(Context context) {
    this(context, null);
  }

  public adderView(Context context, AttributeSet attrs) {
    super(context, attrs);

    LayoutInflater.from(context).inflate(R.layout.number_adder, this);
    etAmount = (EditText) findViewById(R.id.etAmount);
    btnDecrease = (Button) findViewById(R.id.btnDecrease);
    btnIncrease = (Button) findViewById(R.id.btnIncrease);
    btnDecrease.setOnClickListener(this);
    btnIncrease.setOnClickListener(this);
    etAmount.addTextChangedListener(this);

    TypedArray obtainStyledAttributes = getContext().obtainStyledAttributes(attrs, R.styleable.AmountView);
    int btnWidth = obtainStyledAttributes.getDimensionPixelSize(R.styleable.AmountView_btnWidth, 100);
    int tvWidth = obtainStyledAttributes.getDimensionPixelSize(R.styleable.AmountView_tvWidth, 200);
    int tvTextSize = obtainStyledAttributes.getDimensionPixelSize(R.styleable.AmountView_tvTextSize, 0);
    int btnTextSize = obtainStyledAttributes.getDimensionPixelSize(R.styleable.AmountView_btnTextSize, 0);
    obtainStyledAttributes.recycle();

    LayoutParams btnParams = new LayoutParams(btnWidth, LayoutParams.MATCH_PARENT);
    btnDecrease.setLayoutParams(btnParams);
    btnIncrease.setLayoutParams(btnParams);
    if (btnTextSize != 0) {
      btnDecrease.setTextSize(TypedValue.COMPLEX_UNIT_PX, btnTextSize);
      btnIncrease.setTextSize(TypedValue.COMPLEX_UNIT_PX, btnTextSize);
    }

    LayoutParams textParams = new LayoutParams(tvWidth, LayoutParams.MATCH_PARENT);
    etAmount.setLayoutParams(textParams);
    if (tvTextSize != 0) {
      etAmount.setTextSize(tvTextSize);
    }
  }

  public void setOnAmountChangeListener(OnAmountChangeListener onAmountChangeListener) {
    this.mListener = onAmountChangeListener;
  }

  public void setGoods_storage(int goods_storage) {
    this.goods_storage = goods_storage;
  }

  public void setTextCount(int count){
    this.amount = count;
    this.etAmount.setText(amount+"");
  }

  @Override
  public void onClick(View v) {
    int i = v.getId();
    if (i == R.id.btnDecrease) {
      if (amount > 0) {
        amount--;
        etAmount.setText(amount + "");
      }
    } else if (i == R.id.btnIncrease) {
      if (amount < goods_storage) {
        amount++;
        etAmount.setText(amount + "");

      }
    }

    etAmount.clearFocus();

    if (mListener != null) {
      mListener.onAmountChange(this, amount);
    }
  }

  @Override
  public void beforeTextChanged(CharSequence s, int start, int count, int after) {

  }

  @Override
  public void onTextChanged(CharSequence s, int start, int before, int count) {

  }

  @Override
  public void afterTextChanged(Editable s) {
    if (s.toString().isEmpty())
      return;
    amount = Integer.valueOf(s.toString());
    if (amount > goods_storage) {
      etAmount.setText(goods_storage + "");
      return;
    }
    if (amount == 0){
//      btnDecrease.setBackgroundResource(R.drawable.jian);
    }
    if (amount > 0){
//      btnDecrease.setBackgroundResource(R.drawable.lvjian);
    }

    if (mListener != null) {
      mListener.onAmountChange(this, amount);
    }
  }


  public interface OnAmountChangeListener {
    void onAmountChange(View view, int amount);
  }

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