Android 自定义AlertDialog--备忘

博观而约取，厚积而薄发。这篇文章主要讲述Android 自定义AlertDialog--备忘相关的知识，希望能为你提供帮助。
我们可以通过继承原生的Dialog来实现自定义的Dialog。
本文的自定义Dialog和原生的AlertDialog的创建方式类似，通过一个静态Builder类来设置Dialog的图标、标题、内容和按钮。
【Android 自定义AlertDialog--备忘】布局文件代码：
（注意这里的根布局的宽高如果用match_parent或者设置为具体的数值都和wrap_conten效果一样，可以通过设置子控件的大小来撑开）

< ?xml version="1.0" encoding="utf-8"?> < android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="#ffffff"> < LinearLayout android:id="@+id/dialog_header" android:orientation="vertical" android:layout_width="220dp" android:layout_height="wrap_content" android:padding="16dp" android:gravity="center" android:background="@color/colorGreen" app:layout_constraintTop_toTopOf="parent" app:layout_constraintStart_toStartOf="parent" app:layout_constraintEnd_toEndOf="parent"> < !-- Icon --> < ImageView android:contentDescription="@id/dialog_title" android:id="@+id/dialog_icon" android:layout_width="100dp" android:layout_height="100dp" android:src="https://www.songbingjia.com/android/@drawable/ic_check_circle" /> < !-- Title（default is gone) --> < TextView android:id="@+id/dialog_title" android:layout_width="wrap_content" android:layout_height="wrap_content" android:padding="8dp" android:textSize="18sp" android:textStyle="bold" android:textColor="#ffffff" android:visibility="gone" /> < /LinearLayout> < LinearLayout android:orientation="vertical" android:layout_width="wrap_content" android:layout_height="wrap_content" android:padding="16dp" android:gravity="center" app:layout_constraintTop_toBottomOf="@+id/dialog_header" app:layout_constraintStart_toStartOf="parent" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintBottom_toBottomOf="parent"> < !-- Dialog Message --> < TextView android:id="@+id/dialog_message" android:layout_width="wrap_content" android:layout_height="wrap_content" android:padding="8dp" tools:text="Dialog Message" /> < Button android:id="@+id/dialog_button" android:layout_width="100dp" android:layout_height="42dp" android:layout_marginTop="16dp" android:layout_marginBottom="8dp" android:background="@drawable/bg_dialog_button" android:textColor="#ffffff" android:text="@string/dialog_button"> < /Button> < /LinearLayout> < /android.support.constraint.ConstraintLayout>

package com.cloud.design.dialog; import android.app.Dialog; import android.content.Context; import android.graphics.Bitmap; import android.support.annotation.NonNull; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.Button; import android.widget.ImageView; import android.widget.TextView; import com.cloud.design.R; public class InfoDialog extends Dialog {private InfoDialog(Context context, int themeResId) { super(context, themeResId); }public static class Builder {private View mLayout; private ImageView mIcon; private TextView mTitle; private TextView mMessage; private Button mButton; private View.OnClickListener mButtonClickListener; private InfoDialog mDialog; public Builder(Context context) { mDialog = new InfoDialog(context, R.style.Theme_AppCompat_Dialog); LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); //加载布局文件 mLayout = inflater.inflate(R.layout.dialog, null, false); //添加布局文件到 Dialog mDialog.addContentView(mLayout, new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT)); mIcon = mLayout.findViewById(R.id.dialog_icon); mTitle = mLayout.findViewById(R.id.dialog_title); mMessage = mLayout.findViewById(R.id.dialog_message); mButton = mLayout.findViewById(R.id.dialog_button); }/** * 通过 ID 设置 Dialog 图标 */ public Builder setIcon(int resId) { mIcon.setImageResource(resId); return this; }/** * 用 Bitmap 作为 Dialog 图标 */ public Builder setIcon(Bitmap bitmap) { mIcon.setImageBitmap(bitmap); return this; }/** * 设置 Dialog 标题 */ public Builder setTitle(@NonNull String title) { mTitle.setText(title); mTitle.setVisibility(View.VISIBLE); return this; }/** * 设置 Message */ public Builder setMessage(@NonNull String message) { mMessage.setText(message); return this; }/** * 设置按钮文字和监听 */ public Builder setButton(@NonNull String text, View.OnClickListener listener) { mButton.setText(text); mButtonClickListener = listener; return this; }public InfoDialog create() { mButton.setOnClickListener(view -> { mDialog.dismiss(); mButtonClickListener.onClick(view); }); mDialog.setContentView(mLayout); mDialog.setCancelable(true); //用户可以点击后退键关闭 Dialog mDialog.setCanceledOnTouchOutside(false); //用户不可以点击外部来关闭 Dialog return mDialog; } } }

public class MainActivity extends AppCompatActivity {@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); findViewById(R.id.button_show_dialog).setOnClickListener(v -> { InfoDialog infoDialog = new InfoDialog.Builder(this) .setTitle("Done") .setMessage("Something done") .setButton("OK", view -> Toast.makeText(this, "OK Clicked.", Toast.LENGTH_SHORT).show() ).create(); infoDialog.show(); }); } }

参考：https://www.cnblogs.com/cloudfloating/p/9811380.html