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一行解决:

window?.setBackgroundDrawableResource(android.R.color.transparent)

原文件:

/*** Created by Xinghai.Zhao* 自定义选择弹框*/
@SuppressLint("InflateParams", "MissingInflatedId")
class CustomDialog(context: Context?) : AlertDialog(context){var mCallBack: ClickCallBack? = nullvar mTextViewTitle: TextView? = nullvar mTextViewContent: TextView? = nullvar mEditText:EditText? = nullvar mEditTextMax:TextView? = nullvar mEditLayout: View? = nullvar mTextViewYes: TextView? = nullvar mTextViewNo: TextView? = nullvar mLine: View? = nullvar isEdit:Boolean = falseconstructor(context: Context?, title: String?, content: String?, callBack: ClickCallBack, isEditType:Boolean) : this(context) {mCallBack = callBackisEdit = isEditTypemTextViewTitle?.text = title?:""mTextViewContent?.text = content?:""if (isEdit){mEditLayout?.visibility = View.VISIBLE}else{mEditLayout?.visibility = View.GONE}}init {val inflate = LayoutInflater.from(context).inflate(R.layout.dialog_custom, null)setView(inflate)window?.setBackgroundDrawableResource(android.R.color.transparent)//设置点击别的区域不关闭页面setCancelable(false)mTextViewTitle = inflate.findViewById(R.id.dialog_custom_title)mTextViewContent = inflate.findViewById(R.id.dialog_custom_content)mEditText = inflate.findViewById(R.id.dialog_custom_edit)mEditTextMax = inflate.findViewById(R.id.dialog_custom_edit_max)mEditLayout = inflate.findViewById(R.id.dialog_custom_edit_layout)mTextViewYes = inflate.findViewById(R.id.dialog_custom_yes)mTextViewYes?.setOnClickListener{mCallBack?.onYesClick(this)}mTextViewNo = inflate.findViewById(R.id.dialog_custom_no)mTextViewNo?.setOnClickListener{dismiss()}mLine = inflate.findViewById(R.id.dialog_custom_line)}interface ClickCallBack {fun onYesClick(dialog: CustomDialog)}
}

layout:

<?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="@drawable/bg_set"android:orientation="vertical"><TextViewandroid:id="@+id/dialog_custom_title"android:layout_width="match_parent"android:layout_height="wrap_content"android:gravity="center"android:padding="20dp"android:textColor="@color/black"android:textSize="18sp"android:textStyle="bold" /><TextViewandroid:id="@+id/dialog_custom_content"android:layout_width="match_parent"android:layout_height="wrap_content"android:gravity="center"android:padding="30dp"android:textColor="@color/black"android:textSize="14sp" /><LinearLayoutandroid:id="@+id/dialog_custom_edit_layout"android:layout_width="match_parent"android:layout_height="wrap_content"android:orientation="horizontal"android:paddingBottom="20dp"android:visibility="gone"><EditTextandroid:id="@+id/dialog_custom_edit"android:layout_width="0dp"android:layout_height="wrap_content"android:layout_marginStart="10dp"android:layout_weight="1"android:maxLength="10"android:maxLines="1"android:padding="10dp"android:textColor="@color/black"android:textSize="14sp" /><TextViewandroid:id="@+id/dialog_custom_edit_max"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginEnd="10dp"android:padding="10dp"android:textColor="@color/grey"android:textSize="12sp" /></LinearLayout><TextViewandroid:layout_width="match_parent"android:layout_height="1dp"android:background="@color/grey2" /><LinearLayoutandroid:layout_width="match_parent"android:layout_height="wrap_content"android:orientation="horizontal"><TextViewandroid:id="@+id/dialog_custom_no"android:layout_width="0dp"android:layout_height="wrap_content"android:layout_weight="1"android:gravity="center"android:padding="10dp"android:text="取消"android:textColor="@color/black"android:textSize="16sp" /><TextViewandroid:id="@+id/dialog_custom_line"android:layout_width="1dp"android:layout_height="match_parent"android:background="@color/grey2" /><TextViewandroid:id="@+id/dialog_custom_yes"android:layout_width="0dp"android:layout_height="wrap_content"android:layout_weight="1"android:gravity="center"android:padding="10dp"android:text="确定"android:textColor="@color/blue"android:textSize="16sp" /></LinearLayout>
</LinearLayout>

bg_set.xml:

<shape xmlns:android="http://schemas.android.com/apk/res/android"android:shape="rectangle"><corners android:radius="14dp" /> <!-- 圆角半径为10dp --><solid android:color="@color/white" /> <!-- 设置黑色背景并且70%不透明度 -->
</shape>