安卓AlertDialog四种对话框的最科学编写用法

<?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="match_parent"
android:background="@drawable/background"
xmlns:widget="http://schemas.android.com/apk/res-auto"
android:orientation="vertical">
    <button
        android:id="@+id/button_1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="简单的dialog"
        />
    <button
        android:id="@+id/button_2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="列表的dialog"
        />
    <button
        android:id="@+id/button_3"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="单选的dialog"
        />
    <button
        android:id="@+id/button_4"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="多选的dialog"
        />

</linearlayout>

import androidx.appcompat.app.actionbar;
import androidx.appcompat.app.alertdialog;
import androidx.appcompat.app.appcompatactivity;
import android.content.dialoginterface;
import android.os.bundle;
import android.view.view;
import android.widget.button;
import android.widget.toast;



public class mainactivity extends appcompatactivity{
    int index;
    string [] item = {"android","ios","spark","hadoop","web"};
    boolean[] bools = {false,false,false,false,false};
    // 设置boolean数组所有的选项设置默认没选
    @override
    protected void oncreate(bundle savedinstancestate) {
        super.oncreate(savedinstancestate);
        setcontentview(r.layout.activity_main);


        actionbar actionbar = getsupportactionbar();
        if (actionbar != null) {
            actionbar.hide();
        }
        button button=(button)findviewbyid(r.id.button_1);
        button.setonclicklistener(new view.onclicklistener() {
            @override
            public void onclick(view view) {
                alertdialog.builder builder = new alertdialog.builder(mainactivity.this);
                builder.seticon(r.drawable.girl);

                builder.settitle("标题栏");
                builder.setmessage("对话框内容，可自行设置");
                builder.setpositivebutton("确定",new dialoginterface.onclicklistener() {
                    @override
                    public void onclick(dialoginterface dialog, int which) {
                        toast.maketext(mainactivity.this, "点击了确定", toast.length_short).show();
                    }
                });
                builder.setnegativebutton("取消", new dialoginterface.onclicklistener() {
                    @override
                    public void onclick(dialoginterface dialoginterface, int i) {
                        toast.maketext(mainactivity.this, "点击了取消", toast.length_short).show();
                    }
                });
                builder.setneutralbutton("好的", new dialoginterface.onclicklistener() {
                    @override
                    public void onclick(dialoginterface dialoginterface, int i) {
                        toast.maketext(mainactivity.this, "点击了“好的”", toast.length_short).show();
                    }
                });
                alertdialog alertdialog = builder.create();
                alertdialog.show();
            }
        });

        button button2=(button)findviewbyid(r.id.button_2);
        button2.setonclicklistener(new view.onclicklistener() {
            @override
            public void onclick(view view) {

                alertdialog.builder builder = new alertdialog.builder(mainactivity.this);
                builder.settitle("请选择一个技术分支");
                builder.setitems(item, new dialoginterface.onclicklistener() {
                    @override
                    public void onclick(dialoginterface dialog, int which) {
                        toast.maketext(mainactivity.this, "选择了"+item[which], toast.length_short).show();
                    }
                });
                // 取消可以不添加
                //builder.setnegativebutton("取消",null);
                alertdialog alertdialog = builder.create();
                alertdialog.show();
            }
        });
        button button3=(button)findviewbyid(r.id.button_3);

        button3.setonclicklistener(new view.onclicklistener() {
            @override
            public void onclick(view view) {

                alertdialog.builder builder = new alertdialog.builder(mainactivity.this);
                builder.settitle("请选择技术分支：");
                builder.setsinglechoiceitems(item, index, new dialoginterface.onclicklistener() {
                    @override
                    public void onclick(dialoginterface dialog, int which) {
                        index = which;
                    }
                });
                builder.setpositivebutton("确定", new dialoginterface.onclicklistener() {
                    @override
                    public void onclick(dialoginterface dialog, int which) {
                        toast.maketext(mainactivity.this, "选择了"+item[index], toast.length_short).show();
                    }
                });
                builder.setnegativebutton("取消",null);
                alertdialog alertdialog = builder.create();
                alertdialog.show();
            }
        });
        button button4=(button)findviewbyid(r.id.button_4);
        button4.setonclicklistener(new view.onclicklistener() {
            @override
            public void onclick(view view) {
                alertdialog.builder builder = new alertdialog.builder(mainactivity.this);
                builder.settitle("请选择技术分支：");
                builder.setmultichoiceitems(item, bools, new dialoginterface.onmultichoiceclicklistener() {
                    @override
                    public void onclick(dialoginterface dialog, int which, boolean ischecked) {
                        bools[which] = ischecked;
                    }
                });
                builder.setpositivebutton("确定", new dialoginterface.onclicklistener() {
                    @override
                    public void onclick(dialoginterface dialog, int which) {
                        stringbuffer sb = new stringbuffer();
                        for (int i = 0; i < item.length; i++) {
                            if (bools[i]) {
                                sb.append(item[i] + " ");
                            }
                        }
                        toast.maketext(mainactivity.this, "选择了" + sb.tostring(), toast.length_short).show();
                    }
                });
                builder.setnegativebutton("取消",null);
                alertdialog alertdialog = builder.create();
                alertdialog.show();
            }
        });
    }







}