Android自定义控件之购物车数量加减器

package com.hiwhitley.demo; import android.content.Context; import android.content.res.TypedArray; import android.text.Editable; import android.text.TextWatcher; import android.util.AttributeSet; import android.util.TypedValue; import android.view.LayoutInflater; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.LinearLayout; /** * 自定义组件：购买数量，带减少增加按钮 * Created by hiwhitley on 2016/7/4. */ public class AmountView extends LinearLayout implements View.OnClickListener, TextWatcher { private static final String TAG = "AmountView"; private int amount = 1; //购买数量 private int goods_storage = 1; //商品库存 private OnAmountChangeListener mListener; private EditText etAmount; private Button btnDecrease; private Button btnIncrease; public AmountView(Context context) { this(context, null); } public AmountView(Context context, AttributeSet attrs) { super(context, attrs); LayoutInflater.from(context).inflate(R.layout.view_amount, 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, LayoutParams.WRAP_CONTENT); int tvWidth = obtainStyledAttributes.getDimensionPixelSize(R.styleable.AmountView_tvWidth, 80); 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; } @Override public void onClick(View v) { int i = v.getId(); if (i == R.id.btnDecrease) { if (amount > 1) { 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 (mListener != null) { mListener.onAmountChange(this, amount); } } public interface OnAmountChangeListener { void onAmountChange(View view, int amount); } }