建造者模式Dialog

package com.example.builderdemo;

import androidx.appcompat.app.AppCompatActivity;

import android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    public void showDialog(View view) {
        new MyDialog.Builder(this)
                .setTitle("我是dialog的标题 ")
                .setMessage("我是消息内容")
                .setConfirmButton("ok", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        Toast.makeText(MainActivity.this, "我点击了确定按钮", Toast.LENGTH_SHORT).show();
                    }
                })
                .setCancelButton("cancel", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        Toast.makeText(MainActivity.this, "我点击了取消按钮", Toast.LENGTH_SHORT).show();
                    }
                })
                .create().show();
    }
}

package com.example.builderdemo;

import android.app.Dialog;
import android.content.Context;
import android.content.DialogInterface;
import android.view.View;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import android.view.ViewGroup.LayoutParams;
import android.widget.Button;
import android.widget.TextView;

public class MyDialog extends Dialog {
    public MyDialog(@NonNull Context context) {
        super(context);
    }

    public MyDialog(@NonNull Context context, int themeResId) {
        super(context, themeResId);
    }

    protected MyDialog(@NonNull Context context, boolean cancelable, @Nullable OnCancelListener cancelListener) {
        super(context, cancelable, cancelListener);
    }
    public static class Builder{
        private Context context;

        private String title="提示";
        private String message="是否确定";
        private String confirmText="确定";
        private String cancelText="取消";
        private DialogInterface.OnClickListener confirmListener;//确认点击事件
        private DialogInterface.OnClickListener cancelListener;//取消点击事件
        private View dialogView;//对话框视图

        public Builder(Context context){
            this.context = context;
        }

        public String getTitle() {
            return title;
        }

        public Builder setTitle(String title) {
            this.title = title;
            return this;
        }

        public String getMessage() {
            return message;
        }

        public Builder setMessage(String message) {
            this.message = message;
            return this;
        }
        //设置确定按钮
        public Builder setConfirmButton(String confirmText, DialogInterface.OnClickListener listener){
            this.confirmText = confirmText;
            this.confirmListener = listener;
            return this;
        }

        //设置取消按钮
        public Builder setCancelButton(String cancelText, DialogInterface.OnClickListener listener){
            this.cancelText = cancelText;
            this.cancelListener = listener;
            return this;
        }

        //构建Dialog
        public MyDialog create(){
            dialogView = View.inflate(context, R.layout.dialog_view, null);
            final MyDialog myDialog = new MyDialog(context,R.style.myDialog);
            myDialog.setContentView(dialogView, new LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.MATCH_PARENT));
            TextView tv_title = (TextView) dialogView.findViewById(R.id.tv_title);
            tv_title.setText(getTitle());
            TextView tv_message = (TextView) dialogView.findViewById(R.id.tv_message);
            tv_message.setText(getMessage());

            Button btn_confirm = (Button) dialogView.findViewById(R.id.btn_confirm);
            btn_confirm.setText(confirmText);
            if(confirmListener != null){
                btn_confirm.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        confirmListener.onClick(myDialog, DialogInterface.BUTTON_POSITIVE);
                        myDialog.dismiss();
                    }
                });
            }else{
                btn_confirm.setVisibility(View.GONE);
            }

            Button btn_cancel = (Button) dialogView.findViewById(R.id.btn_cancel);
            btn_cancel.setText(cancelText);
            if(cancelListener != null){
                btn_cancel.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        cancelListener.onClick(myDialog, DialogInterface.BUTTON_NEGATIVE);
                        myDialog.dismiss();
                    }
                });
            }else{
                btn_cancel.setVisibility(View.GONE);
            }
            return myDialog;
        }
    }
}