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); }<?xml version="1.0" encoding="utf-8"?><com.zhy.autolayout.AutoLinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="90px" android:focusable="true" android:divider="@drawable/divder" android:background="@drawable/bg_amout_layout" android:showDividers="middle" android:orientation="horizontal"> <Button android:id="@+id/btnDecrease" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:gravity="center" android:background="@drawable/jian"/> <EditText android:id="@+id/etAmount" android:layout_width="200px" android:layout_height="match_parent" android:minWidth="150px" android:layout_weight="2" android:background="@null" android:inputType="number" android:textSize="13sp" android:text="0" android:gravity="center"/> <Button android:id="@+id/btnIncrease" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:gravity="center" android:background="@drawable/jia"/></com.zhy.autolayout.AutoLinearLayout>

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