带有增加与减少按钮的数量选择控件QuantityView

app:qv_addButtonBackground="color|drawable"app:qv_addButtonText="string"
app:qv_addButtonTextColor="color"
app:qv_removeButtonBackground="color|drawable"
app:qv_removeButtonText="string"
app:qv_removeButtonTextColor="color"
app:qv_quantityBackground="color|drawable"
app:qv_quantityTextColor="color"
app:qv_quantity="integer"
app:qv_quantityPadding="dimension"
app:qv_maxQuantity="integer"
app:qv_minQuantity="integer"

import android.annotation.TargetApi;
import android.content.Context;
import android.content.DialogInterface;
import android.content.res.TypedArray;
import android.graphics.Color;
import android.graphics.drawable.Drawable;
import android.os.Build;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AlertDialog;
import android.util.AttributeSet;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.TextView;

/**
 * Quantity view to add and remove quantities
 */
public class QuantityView extends LinearLayout implements View.OnClickListener {

    private Drawable quantityBackground, addButtonBackground, removeButtonBackground;

    private String addButtonText, removeButtonText;

    private int quantity, maxQuantity, minQuantity;
    private int quantityPadding;

    private int quantityTextColor, addButtonTextColor, removeButtonTextColor;

    private Button mButtonAdd, mButtonRemove;
    private TextView mTextViewQuantity;

    public interface OnQuantityChangeListener {
        void onQuantityChanged(int newQuantity, boolean programmatically);

        void onLimitReached();
    }

    private OnQuantityChangeListener onQuantityChangeListener;

    public QuantityView(Context context) {
        super(context);
        init(null, 0);
    }

    public QuantityView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init(attrs, 0);
    }

    public QuantityView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        init(attrs, defStyle);
    }

    @TargetApi(Build.VERSION_CODES.JELLY_BEAN)
    private void init(AttributeSet attrs, int defStyle) {
        final TypedArray a = getContext().obtainStyledAttributes(attrs, R.styleable.QuantityView, defStyle, 0);

        addButtonText = getResources().getString(R.string.qv_add);
        if (a.hasValue(R.styleable.QuantityView_qv_addButtonText)) {
            addButtonText = a.getString(R.styleable.QuantityView_qv_addButtonText);
        }
        addButtonBackground = ContextCompat.getDrawable(getContext(), R.drawable.qv_btn_selector);
        if (a.hasValue(R.styleable.QuantityView_qv_addButtonBackground)) {
            addButtonBackground = a.getDrawable(R.styleable.QuantityView_qv_addButtonBackground);
        }
        addButtonTextColor = a.getColor(R.styleable.QuantityView_qv_addButtonTextColor, Color.BLACK);

        removeButtonText = getResources().getString(R.string.qv_remove);
        if (a.hasValue(R.styleable.QuantityView_qv_removeButtonText)) {
            removeButtonText = a.getString(R.styleable.QuantityView_qv_removeButtonText);
        }
        removeButtonBackground = ContextCompat.getDrawable(getContext(), R.drawable.qv_btn_selector);
        if (a.hasValue(R.styleable.QuantityView_qv_removeButtonBackground)) {
            removeButtonBackground = a.getDrawable(R.styleable.QuantityView_qv_removeButtonBackground);
        }
        removeButtonTextColor = a.getColor(R.styleable.QuantityView_qv_removeButtonTextColor, Color.BLACK);

        quantity = a.getInt(R.styleable.QuantityView_qv_quantity, 0);
        maxQuantity = a.getInt(R.styleable.QuantityView_qv_maxQuantity, Integer.MAX_VALUE);
        minQuantity = a.getInt(R.styleable.QuantityView_qv_minQuantity, 0);

        quantityPadding = (int) a.getDimension(R.styleable.QuantityView_qv_quantityPadding, pxFromDp(24));
        quantityTextColor = a.getColor(R.styleable.QuantityView_qv_quantityTextColor, Color.BLACK);
        quantityBackground = ContextCompat.getDrawable(getContext(), R.drawable.qv_bg_selector);
        if (a.hasValue(R.styleable.QuantityView_qv_quantityBackground)) {
            quantityBackground = a.getDrawable(R.styleable.QuantityView_qv_quantityBackground);
        }

        a.recycle();
        int dp10 = pxFromDp(10);

        mButtonAdd = new Button(getContext());
        mButtonAdd.setGravity(Gravity.CENTER);
        mButtonAdd.setPadding(dp10, dp10, dp10, dp10);
        mButtonAdd.setMinimumHeight(0);
        mButtonAdd.setMinimumWidth(0);
        mButtonAdd.setMinHeight(0);
        mButtonAdd.setMinWidth(0);
        setAddButtonBackground(addButtonBackground);
        setAddButtonText(addButtonText);
        setAddButtonTextColor(addButtonTextColor);

        mButtonRemove = new Button(getContext());
        mButtonRemove.setGravity(Gravity.CENTER);
        mButtonRemove.setPadding(dp10, dp10, dp10, dp10);
        mButtonRemove.setMinimumHeight(0);
        mButtonRemove.setMinimumWidth(0);
        mButtonRemove.setMinHeight(0);
        mButtonRemove.setMinWidth(0);
        setRemoveButtonBackground(removeButtonBackground);
        setRemoveButtonText(removeButtonText);
        setRemoveButtonTextColor(removeButtonTextColor);

        mTextViewQuantity = new TextView(getContext());
        mTextViewQuantity.setGravity(Gravity.CENTER);
        setQuantityTextColor(quantityTextColor);
        setQuantity(quantity);
        setQuantityBackground(quantityBackground);
        setQuantityPadding(quantityPadding);

        setOrientation(HORIZONTAL);

        addView(mButtonRemove, LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
        addView(mTextViewQuantity, LayoutParams.WRAP_CONTENT, LayoutParams.MATCH_PARENT);
        addView(mButtonAdd, LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);

        mButtonAdd.setOnClickListener(this);
        mButtonRemove.setOnClickListener(this);
        mTextViewQuantity.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        if (v == mButtonAdd) {
            if (quantity + 1 > maxQuantity) {
                if (onQuantityChangeListener != null) onQuantityChangeListener.onLimitReached();
            } else {
                quantity += 1;
                mTextViewQuantity.setText(String.valueOf(quantity));
                if (onQuantityChangeListener != null)
                    onQuantityChangeListener.onQuantityChanged(quantity, false);
            }
        } else if (v == mButtonRemove) {
            if (quantity - 1 = Build.VERSION_CODES.JELLY_BEAN) {
            mTextViewQuantity.setBackground(quantityBackground);
        } else {
            mTextViewQuantity.setBackgroundDrawable(quantityBackground);
        }
    }

    public Drawable getAddButtonBackground() {
        return addButtonBackground;
    }

    public void setAddButtonBackground(Drawable addButtonBackground) {
        this.addButtonBackground = addButtonBackground;
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
            mButtonAdd.setBackground(addButtonBackground);
        } else {
            mButtonAdd.setBackgroundDrawable(addButtonBackground);
        }
    }

    public Drawable getRemoveButtonBackground() {
        return removeButtonBackground;
    }

    public void setRemoveButtonBackground(Drawable removeButtonBackground) {
        this.removeButtonBackground = removeButtonBackground;
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
            mButtonRemove.setBackground(removeButtonBackground);
        } else {
            mButtonRemove.setBackgroundDrawable(removeButtonBackground);
        }
    }

    public String getAddButtonText() {
        return addButtonText;
    }

    public void setAddButtonText(String addButtonText) {
        this.addButtonText = addButtonText;
        mButtonAdd.setText(addButtonText);
    }

    public String getRemoveButtonText() {
        return removeButtonText;
    }

    public void setRemoveButtonText(String removeButtonText) {
        this.removeButtonText = removeButtonText;
        mButtonRemove.setText(removeButtonText);
    }

    public int getQuantity() {
        return quantity;
    }

    public void setQuantity(int quantity) {
        boolean limitReached = false;

        if (quantity > maxQuantity) {
            quantity = maxQuantity;
            limitReached = true;
            if (onQuantityChangeListener != null) onQuantityChangeListener.onLimitReached();
        }
        if (quantity 

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