Android自定义Dialog框样式

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="Http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="#fff"
    android:orientation="vertical">
 
    <RelativeLayout
        android:id="@+id/relativeLayout"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="10dp"
        android:layout_marginRight="10dp"
        >
 
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerVertical="true"
            android:layout_gravity="center"
            android:text="购买数量"
            android:textColor="#000" />
 
        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentRight="true"
            android:layout_centerVertical="true">
 
            <Button
                android:id="@+id/button_reduce"
                android:layout_width="50dp"
                android:layout_height="40dp"
                android:text="—" />
 
            <Button
                android:id="@+id/button_number"
                android:layout_width="50dp"
                android:layout_height="40dp"
                android:text="1" />
 
            <Button
                android:id="@+id/button_plus"
                android:layout_width="50dp"
                android:layout_height="40dp"
                android:text="+" />
        </LinearLayout>
    </RelativeLayout>
 
    <Button
        android:id="@+id/button_buyGoodsDialog_ok"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignBottom="@id/relativeLayout"
        android:text="确定" />
</LinearLayout>

package com.example.administrator.myapplication;
 
import android.app.Activity;
import android.app.Dialog;
import android.content.Context;
import android.os.Bundle;
import android.view.Display;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.Toast;
 
public class BuyGoodsDialog extends Dialog {
    private Activity context;// 上下文对象
 
    private Button reduceButton;// “-”按钮
    private Button numberButton;// “1”按钮
    private Button plusButton;// “+”按钮
    private Button okButton;// “确定”按钮
 
    private View.OnClickListener mClickListener;// 确定按钮的事件监听器
 
    public BuyGoodsDialog(Activity context) {
        super(context);
        this.context = context;
    }
 
    public BuyGoodsDialog(Activity context, int theme, View.OnClickListener clickListener) {
        super(context, theme);
        this.context = context;
        this.mClickListener = clickListener;
    }
 
    public BuyGoodsDialog(Context context, int themeResId) {
        super(context, themeResId);
    }
 
    protected BuyGoodsDialog(Context context, boolean cancelable, OnCancelListener cancelListener) {
        super(context, cancelable, cancelListener);
    }
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // 指定布局
        this.setContentView(R.layout.buy_goods_dialog);
        // 获取buy_goods_dialog布局中的控件
        reduceButton = (Button) findViewById(R.id.button_reduce);// 减号（-）按钮
        numberButton = (Button) findViewById(R.id.button_number);// 数字（1）按钮
        plusButton = (Button) findViewById(R.id.button_plus);// 加号（+）按钮
        okButton = (Button) findViewById(R.id.button_buyGoodsDialog_ok);// 确定按钮
 
        numberButton.setText("1");// 设置数字按钮初始值为1
 
        // 获取窗口对象
        Window dialogWindow = this.getWindow();
        // 窗口管理器
        WindowManager m = context.getWindowManager();
        // 获取屏幕宽、高用
        Display d = m.getDefaultDisplay();
        // 获取对话框当前的参数值
        WindowManager.LayoutParams p = dialogWindow.getAttributes();
        // 这里设置的宽高优先级高于XML中的布局设置
//        // 高度设置为屏幕的0.6
//        p.height = (int) (d.getHeight() * 0.6);
//        // 宽度设置为屏幕的0.8
//        p.width = (int) (d.getWidth() * 0.8);
        // 设置到属性配置中
        dialogWindow.setAttributes(p);
 
        // “+”号按钮的事件监听器，使数字按钮的值加1
        plusButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                numberButton.setText(String.valueOf(Integer.parseInt(numberButton.getText().toString()) + 1));
            }
        });
        // “-”号按钮的事件监听器，使数字按钮的值减1
        reduceButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                int num = Integer.parseInt(numberButton.getText().toString()) - 1;
                if (num <= 0) {
                    numberButton.setText("1");
                } else {
                    numberButton.setText(String.valueOf(num));
                }
            }
        });
 
        // 为确定按钮绑定点击事件监听器
        okButton.setOnClickListener(mClickListener);// 使用外部的
//        okButton.setOnClickListener(onClickListener);// 使用内部自定义的
 
        this.setCancelable(true);// 设置是否点击周围空白处可以取消该Dialog，true表示可以，false表示不可以
    }
 
    
    private String getCount() {
        return numberButton.getText().toString();
    }
 
    public View.OnClickListener onClickListener = new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Toast.makeText(getContext(), "库存：" + getCount(), Toast.LENGTH_SHORT).show();
        }
    };
 
}

BuyGoodsDialog dialog=new BuyGoodsDialog(MainActivity.this, R.style.Theme_AppCompat_Dialog, new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(MainActivity.this,"点击了确定按钮！",Toast.LENGTH_SHORT).show();
            }
});
dialog.show();