购物车自定义view 加减号

----------------------------------------values下建立一个attrs----------------------

<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"/>
</declare-styleable>

============drawable下建立xml===================
=================1. divider=====================

<shape
xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<size
android:width="0.5dp"/>

</shape>

======================view_amount==================

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:showDividers="middle"
>
<Button
android:id="@+id/btnDecrease"
android:layout_width="20dp"
android:layout_height="20dp"
android:gravity="center"
android:background="#FFFFFF"
android:text="-"/>

<EditText
android:id="@+id/etAmount"
android:layout_width="20dp"
android:layout_height="20dp"
android:minWidth="60dp"
android:background="@null"
android:inputType="number"
android:gravity="center"
android:text="1"/>

<Button
android:id="@+id/btnIncrease"
android:layout_width="20dp"
android:layout_height="20dp"
android:gravity="center"
android:background="#FFFFFF"
android:text="+"/>
</LinearLayout>

============================main.xml================

<com.exbawei.liteli.mygouwuche.AmountView
android:id="@+id/amount_view"
android:layout_width="wrap_content"
android:layout_height="20dp"
android:layout_alignParentTop="true"></com.exbawei.liteli.mygouwuche.AmountView>

===============建立AmountView类============

package com.exbawei.liteli.mygouwuche;

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;

/**
* Created by li te li on 2017/10/29.
*/

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);

db31
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);
}
}

================= main===============

package com.exbawei.liteli.mygouwuche;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

private AmountView amountView;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
amountView = (AmountView) findViewById(R.id.amount_view);
amountView.setGoods_storage(5);
amountView.setOnAmountChangeListener(new AmountView.OnAmountChangeListener() {
@Override
public void onAmountChange(View view, int amount) {
Toast.makeText(getApplicationContext(), "Amount=>  " + amount, Toast.LENGTH_SHORT).show();
}
});
}
}

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