Android Studio创建选择地址显示地址项目

package com.example.a2021101;

import androidx.appcompat.app.alertDialog;
import androidx.appcompat.app.AppCompatActivity;

import android.content.DialogInterface;
import android.os.Bundle;
import android.os.Handler;
import android.view.Gravity;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.ProgressBar;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.SeekBar;
import android.widget.TextView;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.List;

import javax.microedition.khronos.egl.EGLDisplay;

public class MainActivity extends AppCompatActivity {
    private String jiguan;
    private Button  bt1;
    private TextView tv1;
    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.linearlayout01);
        initWidget();
    }

    private void initWidget()
    {
        final alertDialog.Builder builder =
                new alertDialog.Builder(this);

        bt1=(Button)findViewById(R.id.bt1);
        tv1=(TextView)findViewById(R.id.tv1);

                    bt1.setonClickListener(new View.onClickListener() {
                        @Override
                        public void onClick(View view) {

                            builder.setNegativeButton("取消", new DialogInterface.onClickListener() {
                                @Override
                                public void onClick(DialogInterface dialogInterface, int i) {
                                    Toast toast;
                                    toast=Toast.makeText(MainActivity.this,"點了取消",Toast.LENGTH_LONG);
                                    toast.show();
                                }
                            });
                            builder.setPositiveButton("確定", new DialogInterface.onClickListener() {
                                @Override
                                public void onClick(DialogInterface dialogInterface, int i) {
                                    Toast toast;
                                    toast=Toast.makeText(MainActivity.this,"點了確認",Toast.LENGTH_LONG);
                                    tv1.setText("已选择:"+jiguan);
                                    toast.show();

                                }
                            }) ;
                            builder.show();
                        }
                    });

                    final String[] info={"璧山","沙坪坝","九龙坡","江北"};
                    builder.setSingleChoiceItems(info,-1 , new DialogInterface.onClickListener() {
                        @Override
                        public void onClick(DialogInterface dialogInterface, int i) {
                            jiguan=info[i];
                                   if (i==0){
                                 Toast toast;
                                 toast=Toast.makeText(MainActivity.this,info[i],Toast.LENGTH_LONG);
                                 toast.show();
                                   }
                                   if (i==1){
                                       Toast toast;
                                       toast=Toast.makeText(MainActivity.this,info[i],Toast.LENGTH_LONG);
                                       toast.show();
                                   }
                            if (i==2){
                                Toast toast;
                                toast=Toast.makeText(MainActivity.this,info[i],Toast.LENGTH_LONG);
                                toast.show();
                            }
                            if (i==3){
                                Toast toast;
                                toast=Toast.makeText(MainActivity.this,info[i],Toast.LENGTH_LONG);
                                toast.show();
                            }
                        }
                    });

                }
            }

执行效果: