<?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();
            }
        });
    }







}