Android foundation - Dialog

He wrote four dialog

Layout file

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="确定取消对话框" />
    <Button
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="列表对话框"/>
    <Button
        android:id="@+id/button3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="单选列表框"/>
    <Button
        android:id="@+id/button4"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="多选列表框"/>

</LinearLayout>

java code

package com.example.mydialogi;

import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;

import android.app.Dialog;
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 {

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

        / * 
        * with "OK", "Cancel" button dialog 
        * * / 
        the Button Button1 = (the Button) the findViewById (R.id.button1); 
        button1.setOnClickListener ( new new View.OnClickListener ( ) { 
            @Override 
            public  void the onClick (View V) {
                 // create a AlterDialog objects 
                AlertDialog AlertDialog = new new AlertDialog.Builder ( 
                        the MainActivity. the this 
                ) .create (); 
                alertDialog.setIcon (R.drawable.b); 
                alertDialog.setTitle ( "title" );
                alertDialog.setMessage ( "content" );
                 // set the button and in response 
                alertDialog.setButton ( 
                        DialogInterface.BUTTON_NEGATIVE, "cancel", new new DialogInterface.OnClickListener () { 
                            @Override 
                            public  void the onClick (DialogInterface Dialog, int Which) { 
                                Toast. makeText ( 
                                        . the MainActivity the this , "choose cancel" , Toast.LENGTH_SHORT 
                                ) the .Show ();  
                            }
                        } 
                );
                alertDialog.setButton(
                        DialogInterface.BUTTON_POSITIVE, "确定", new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which) {
                                Toast.makeText(
                                        MainActivity.this,"选择了确定",Toast.LENGTH_SHORT
                                ).show();
                            }
                        }
                );
                alertDialog.show();
            }
        }); 

        / * );
        List dialog * 
        * * / 
        the Button Button2 = (the Button) the findViewById (R.id.button2); 
        button2.setOnClickListener ( new new View.OnClickListener () { 
            @Override 
            public  void the onClick (View V) {
                 // with four list items the list dialog 
                Final String [] = the Items new new String [] {
                         "a", "B", "C", "D" 
                }; 
                // Create a Builder objects 
                AlertDialog.Builder Builder = new new AlertDialog.Builder (the MainActivity. the this 
                builder.setIcon (R.drawable.b);
                builder.setTitle ( "title" );
                 // add a list item 
                builder.setItems (the Items, new new DialogInterface.OnClickListener () { 
                    @Override 
                    public  void onClick (DialogInterface Dialog, int Which) { 
                        Toast.makeText ( 
                                MainActivity. the this , "select the [ "+ Items [which] +"] " , Toast.LENGTH_SHORT 
                        ) .Show (); 
                    } 
                }); 
                Once builder.create () show ();. //             }Create and display the dialog box 

        }); 

        the Button Button3 = (the Button) the findViewById (R.id.button3); 
        button3.setOnClickListener ( new new View.OnClickListener () { 
            @Override 
            public  void the onClick (View V) {
                 // band selection list item dialog 
                Final String [] items = new new String [] {
                         "a", "B", "C", "D" 
                }; 
                AlertDialog.Builder Builder = new new AlertDialog.Builder (the MainActivity. the this ); 
                builder.setTitle ( "title" );
                builder.setIcon (R.drawable.b); 
                // add a list item 
                builder.setSingleChoiceItems (items, 0, new new DialogInterface.OnClickListener () { 
                    @Override 
                    public  void the onClick (DialogInterface Dialog, int Which) { 
                        Toast.makeText ( 
                                the MainActivity. the this , "choice is [" + items [which] + "]" , Toast.LENGTH_SHORT 
                        ) the .Show (); 
                    } 
                }); 
                // add OK button 
                builder.setPositiveButton ( "OK", null ); 
                Once builder.create () Show ();. 
            }
        }); 

        / * 
        * With multiple selection list box item 
        * * / 
        the Button Button4 = (the Button) the findViewById (R.id.button4); 
        button4.setOnClickListener ( new new View.OnClickListener () { 
            @Override 
            public  void the onClick (View V) {
                 Final  Boolean [] = the CheckedItems new new  Boolean [] {
                     to false , to true , to false , to true , to false 
                }; 
                Final String [] items = new new String[]{
                        "A","B","C","D","E"
                };
                AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
                builder.setIcon(R.drawable.b);
                builder.setTitle("标题");
                builder.setMultiChoiceItems(
                        items, checkedItems, new DialogInterface.OnMultiChoiceClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which, boolean isChecked) {
                               checkedItems[which]=isChecked;//改变被操作选项的状态

                            }
                        }
                );
                builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        String result = "";
                        for(int i=0;i<items.length;i++){
                            if(checkedItems[i]==to true ){
                                Result + = items [I] + "" ; 
                            } 
                        } 
                        IF ( "!" .equals (Result)) { 
                            Toast.makeText ( 
                                    . the MainActivity the this , "has been selected [" + result + "]" , Toast.LENGTH_SHORT 
                            ) the .Show (); 
                        } 
                    } 
                }); // add OK button 
                Once builder.create () Show ();. 
            } 
        }); 
    } 
}