自定义模拟数据加减控件

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;import com.bwie.jingdong.R;public class NumView 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 NumView(Context context) {        this(context, null);    }    public NumView(Context context, AttributeSet attrs) {        super(context, attrs);        LayoutInflater.from(context).inflate(R.layout.autobuju, this);        etAmount = findViewById(R.id.edit);        btnDecrease =  findViewById(R.id.jian);        btnIncrease =  findViewById(R.id.jia);        btnDecrease.setOnClickListener(this);        btnIncrease.setOnClickListener(this);        etAmount.addTextChangedListener(this);        TypedArray obtainStyledAttributes = getContext().obtainStyledAttributes(attrs, R.styleable.NumView);        int btnWidth = obtainStyledAttributes.getDimensionPixelSize(R.styleable.NumView_buttonwidth, LayoutParams.WRAP_CONTENT);        int tvWidth = obtainStyledAttributes.getDimensionPixelSize(R.styleable.NumView_editwidth, 80);        int tvTextSize = obtainStyledAttributes.getDimensionPixelSize(R.styleable.NumView_buttontext, 0);        int btnTextSize = obtainStyledAttributes.getDimensionPixelSize(R.styleable.NumView_buttontext, 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.jian) {            if (amount > 1) {                amount--;                etAmount.setText(amount + "");            }        } else if (i == R.id.jia) {            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 void setAmount(int amount) {        this.amount = amount;        etAmount.setText(amount + "");        postInvalidate();    }    public interface OnAmountChangeListener {        void onAmountChange(View view, int amount);    }