弹框样式的自定义是通过改变v7包下的AlertDialog的Window对象的view及控制Window的宽高实现的。所有源码如下，其中自定义View的宽度设置为手机屏幕宽度的82%。 

import android.app.Dialog;
import android.content.Context;
import android.support.v7.app.AlertDialog;
import android.text.TextUtils;
import android.view.LayoutInflater;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.widget.LinearLayout;
import android.widget.TextView;
 
import com.environment.protection.R;
import com.environment.protection.util.CommonUtil;
 
/**
 * 简单提示弹框改变样式
 * create by csp in 2019/1/31
 */
public class CustomDialog {
 private Context mContext;
 private String mTitle;
 private String mMessage;
 private String mPositiveText;
 private String mNegativeText;
 private boolean mCancelable=true;
 private boolean mShowOneBtn=false;//只显示一个按钮
 private OnPositiveButtonClickListener mPositiveListener;
 private OnNegativeButtonClickListener mNegativeListener;
 private Dialog mDialog;
 /***描述：为dialog添加一个自定义的View @author csp 创建日期 ：2019/11/14 17:00***/
 private View mCustomView;
 
 private CustomDialog(Context context) {
 mContext = context;
 }
 
 
 public void show() {
 mDialog=showCustomSimpleDialog(mContext, mTitle, mMessage,mCustomView, mPositiveText,mPositiveListener,mNegativeText,mNegativeListener,mCancelable,mShowOneBtn);
 }
 
 public void cancel(){
 if (mDialog!=null){
 mDialog.cancel();
 }
 }
 
 public static class Builder {
 private Context mContext;
 private String mTitle;
 private String mMessage;
 private String mPositiveText;
 private String mNegativeText;
 private OnPositiveButtonClickListener mPositiveListener;
 private OnNegativeButtonClickListener mNegativeListener;
 private boolean mCancelable=true;
 private boolean mShowOneBtn=false;//只显示一个按钮
 
 private View mCustomView;
 
 public Builder setCustomView(View view){
 this.mCustomView=view;
 return this;
 }
 
 public Builder(Context context) {
 this.mContext = context;
 }
 
 public Builder setTitle(String title) {
 this.mTitle = title;
 return this;
 }
 
 public Builder setMessage(String message) {
 this.mMessage = message;
 return this;
 }
 
 public Builder setPositiveText(String text) {
 this.mPositiveText = text;
 return this;
 }
 public Builder setNegativeText(String text) {
 this.mNegativeText = text;
 return this;
 }
 public Builder setCancelable(boolean cancelable){
 this.mCancelable=cancelable;
 return this;
 }
 public Builder setShowOneBtn(boolean showOneBtn){
 this.mShowOneBtn=showOneBtn;
 return this;
 }
 public Builder setOnPositiveButtonClickListener(OnPositiveButtonClickListener listener){
 this.mPositiveListener=listener;
 return this;
 }
 public Builder setOnNegativeButtonClickListener(OnNegativeButtonClickListener listener){
 this.mNegativeListener=listener;
 return this;
 }
 public CustomDialog build() {
 CustomDialog customDialog = new CustomDialog(mContext);
 customDialog.mTitle = this.mTitle;
 customDialog.mMessage = this.mMessage;
 customDialog.mPositiveText = this.mPositiveText;
 customDialog.mNegativeText = this.mNegativeText;
 customDialog.mPositiveListener=this.mPositiveListener;
 customDialog.mNegativeListener=this.mNegativeListener;
 customDialog.mCancelable=this.mCancelable;
 customDialog.mShowOneBtn=this.mShowOneBtn;
 customDialog.mCustomView=this.mCustomView;
 customDialog.show();
 return customDialog;
 }
 }
 /**
 * 自定义弹框逻辑事件接口回调处理
 */
 public interface OnPositiveButtonClickListener {
 void onPositiveButtonClick(Dialog dialog);
 }
 public interface OnNegativeButtonClickListener {
 void onNegativeButtonClick(Dialog dialog);
 }
 /**
 * 简单提示弹框改变样式
 * @param context 上下文对象
 * @param title 标题
 * @param msg 内容
 * @param customView 自定义View
 * @param positiveText 确认按钮文字
 * @param negativeText 取消按钮文字
 * @param positiveListener 确认按钮监听回调
 * @param negativeListener 取消按钮监听回调
 * @param cancelable 是否可以取消弹框
 * @param showOneBtn 是否隐藏取消按钮
 */
 public static Dialog showCustomSimpleDialog(Context context, String title, String msg,View customView,
   String positiveText,OnPositiveButtonClickListener positiveListener,
   String negativeText,OnNegativeButtonClickListener negativeListener,
   boolean cancelable, boolean showOneBtn) {
 AlertDialog.Builder builder = new AlertDialog.Builder(context);
 Dialog dialog = builder.show();
 //是否可以取消
 dialog.setCancelable(cancelable);
 Window window = dialog.getWindow();
 
 View view = LayoutInflater.from(context).inflate(R.layout.dialog_simple_toast, null);
 
 TextView clickNegative = view.findViewById(R.id.click_negative);
 TextView clickPositive = view.findViewById(R.id.click_positive);
 TextView dialogTitle = view.findViewById(R.id.dialog_title);
 TextView dialogMsg = view.findViewById(R.id.dialog_msg);
 View clickLine = view.findViewById(R.id.click_line);
 LinearLayout dialogCustomViewContainer=view.findViewById(R.id.dialog_custom_view_container);
 
 if (customView!=null){
 dialogMsg.setVisibility(View.GONE);
 dialogCustomViewContainer.setVisibility(View.VISIBLE);
 dialogCustomViewContainer.addView(customView);
 }else {
 dialogMsg.setVisibility(View.VISIBLE);
 //消息自定义
 if (!TextUtils.isEmpty(msg)) {
 dialogMsg.setText(msg);
 }
 dialogCustomViewContainer.setVisibility(View.GONE);
 }
 
 //标题自定义
 if (!TextUtils.isEmpty(title)) {
 dialogTitle.setText(title);
 }
 //消息自定义
 if (!TextUtils.isEmpty(msg)) {
 dialogMsg.setText(msg);
 }
 if (showOneBtn){
 clickNegative.setVisibility(View.GONE);//只显示一个按钮，隐藏取消按钮
 clickLine.setVisibility(View.GONE);
 }else {
 clickNegative.setVisibility(View.VISIBLE);
 clickLine.setVisibility(View.VISIBLE);
 }
 //确认按钮自定义
 if (!TextUtils.isEmpty(positiveText)) {
 clickPositive.setText(positiveText);
 }
 //取消按钮自定义
 if (!TextUtils.isEmpty(negativeText)){
 clickNegative.setText(negativeText);
 }
 //取消
 clickNegative.setOnClickListener(new View.OnClickListener() {
 @Override
 public void onClick(View v) {
 dialog.cancel();
 //接口回调
 if (negativeListener!=null){
  negativeListener.onNegativeButtonClick(dialog);
 }
 }
 });
 //确认
 clickPositive.setOnClickListener(new View.OnClickListener() {
 @Override
 public void onClick(View v) {
 dialog.cancel();
 //接口回调
 if (positiveListener!=null) {
  positiveListener.onPositiveButtonClick(dialog);
 }
 }
 });
 
 if (window != null) {
 WindowManager.LayoutParams params = window.getAttributes();
 params.width = CommonUtil.getPhoneWidth(context) * 82 / 100;
 window.setAttributes(params);
 window.setBackgroundDrawableResource(R.drawable.bg_white_corner_5);
 window.setContentView(view);
 }
 return dialog;
 }
}

R.layout.dialog_simple_toast文件

<?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="@color/white"
 android:orientation="vertical">
 
 <TextView
 android:id="@+id/dialog_title"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:paddingLeft="15dp"
 android:paddingTop="15dp"
 android:text="提示"
 android:textColor="@color/title_text_color"
 android:textSize="18sp"
 android:textStyle="bold" />
 <LinearLayout
 android:id="@+id/dialog_custom_view_container"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:orientation="vertical"
 android:visibility="gone"
 android:paddingTop="5dp"
 android:paddingLeft="15dp"
 android:paddingRight="15dp"
 android:paddingBottom="5dp"
 >
 
 </LinearLayout>
 
 <TextView
 android:id="@+id/dialog_msg"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:paddingLeft="15dp"
 android:paddingRight="15dp"
 android:paddingTop="10dp"
 android:text="提示信息"
 android:minHeight="65dp"
 android:textColor="@color/content_text_color"
 android:textSize="14sp"
 />
 
 <View
 android:layout_width="match_parent"
 android:layout_height="1dp"
 android:background="@color/divider" />
 
 <LinearLayout
 android:layout_width="match_parent"
 android:layout_height="45dp"
 android:orientation="horizontal">
 
 <TextView
 android:id="@+id/click_negative"
 android:layout_width="0dp"
 android:visibility="visible"
 android:layout_height="match_parent"
 android:layout_weight="1"
 android:gravity="center"
 android:text="取消"
 android:textColor="@color/content_text_color"
 android:textSize="14sp" />
 
 <View
 android:id="@+id/click_line"
 android:layout_width="1dp"
 android:layout_height="match_parent"
 android:background="@color/divider" />
 
 <TextView
 android:id="@+id/click_positive"
 android:layout_width="0dp"
 android:layout_height="match_parent"
 android:layout_weight="1"
 android:gravity="center"
 android:text="确认"
 android:textColor="@color/app_blue"
 android:textSize="14sp" />
 </LinearLayout>
</LinearLayout>

R.drawable.bg_white_corner_5资源文件 

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" >
 <solid android:color="@color/white" />
 <corners android:radius="5dp" />
 
</shape>

部分颜色资源

<!--app自定义颜色-->
 <color name="app_background">#fbfafa</color>
 <color name="app_blue">#268EE5</color>
 <color name="tab_indicator">#0dace6</color>
 <color name="app_orange">#f18f45</color>
 <color name="app_red">#f77453</color>
 <!--文字颜色-->
 <color name="title_text_color_dark">#222222</color>
 <color name="title_text_color">#333333</color>
 <color name="content_text_color">#666666</color>
 <color name="hint_text_color">#999999</color>
 <color name="hint_text_color_light">#aaaaaa</color>
 <!--分割线颜色-->
 <color name="divider_dark">#e2e2e2</color>
 <color name="divider">#e6e6e6</color>
 <color name="divider_light">#eeeeee</color>

使用方式如下：链式调用，可查看源码自己选择使用。

CustomDialog.Builder builder=new CustomDialog.Builder(mContext);
 builder.setTitle("自定义弹框")//默认为“提示”
  .setMessage("自定义内容")
  .setNegativeText("自定义取消文字")//默认为“取消”
  .setPositiveText("自定义确认文字")//默认为 “确认”
  .setOnPositiveButtonClickListener(new CustomDialog.OnPositiveButtonClickListener() {
  @Override
  public void onPositiveButtonClick(Dialog dialog) {
  ToastUtil.makeText(mContext,"自定义确认按钮监听逻辑处理");
  }
  })
  .setOnNegativeButtonClickListener(new CustomDialog.OnNegativeButtonClickListener() {
  @Override
  public void onNegativeButtonClick(Dialog dialog) {
  ToastUtil.makeText(mContext,"自定义取消按钮监听逻辑处理");
  }
  })
  .setCancelable(false)//默认true
  .build();

效果图如下，使用者可按照实际需要自定义xml文件进行更改：

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