自定义仿京东加减图标

首先 attrs-xml

<declare-styleable name="AmountView"><!-- 左右2边+-按钮的宽度 --><attr name="btnWidth" format="dimension" /><!-- 中间TextView的宽度 --><attr name="tvWidth" format="dimension" /><!--<attr name="tvColor" format="color"/>--><attr name="tvTextSize" format="dimension"/><attr name="btnTextSize" format="dimension"/><attr name="num" format="integer"></attr></declare-styleable>

//继承LinearLayout实现自定义

package com.bawei.myapplication.Houxiang;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.bawei.myapplication.R;/** * 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.tv_sum);        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, 30);        int tvWidth = obtainStyledAttributes.getDimensionPixelSize(R.styleable.AmountView_tvWidth, 30);        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);    }    public void setamount(int num){        this.amount=num;        etAmount.setText(amount+"");        postInvalidate();    }}

1.下面我们来看自定义的布局

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:focusable="true"    android:background="@drawable/bg_amount_layout"    android:showDividers="middle"    android:orientation="horizontal">     <Button        android:id="@+id/btnDecrease"        android:layout_width="0dp"        android:layout_height="match_parent"        android:layout_weight="1"        android:gravity="center"        android:background="@drawable/btn_amount"        android:text="-"/>
     <EditText        android:id="@+id/tv_sum"        android:layout_width="0dp"        android:layout_height="match_parent"        android:minWidth="100dp"        android:layout_weight="2"        android:background="@null"        android:inputType="number"        android:gravity="center"        android:text="1"/>     <Button        android:id="@+id/btnIncrease"        android:layout_width="0dp"        android:layout_height="match_parent"        android:layout_weight="1"        android:gravity="center"        android:background="@drawable/btn_amount"        android:text="+"/></LinearLayout>

//bg_amount_layout.xml

<?xml version="1.0" encoding="utf-8"?><shape xmlns:android="http://schemas.android.com/apk/res/android"><solid android:color="#FFFFFF" /><stroke    android:width="1dp"    android:color="@color/divider" /><padding    android:bottom="1dp"    android:left="1dp"    android:right="1dp"    android:top="1dp" /></shape>

//btn_amount.xml

<?xml version="1.0" encoding="utf-8"?><selector  xmlns:android="http://schemas.android.com/apk/res/android">    <item android:state_pressed="true" android:drawable="@color/divider" />    <item android:state_enabled="false" android:drawable="@color/divider" />    <item android:drawable="@android:color/white" /></selector>

//MainActivity

AmountView mo= (AmountView) findViewById(R.id.num);
//设置最大值mo.setGoods_storage(5);
//设置最小值mo.setamount(1);