<?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" tools:context="com.example.lyp1020k.lv.MainActivity" android:orientation="vertical">  <Button android:id="@+id/button1" android:text="列表框" android:onClick="showList" android:layout_width="match_parent" android:layout_height="wrap_content" />  <Button android:id="@+id/button2" android:text="單選列表" android:onClick="showSingleAlertDialog" android:layout_width="match_parent" android:layout_height="wrap_content" />  <Button android:id="@+id/button3" android:text="多選按鈕" android:onClick="showMutilAlertDialog" android:layout_width="match_parent" android:layout_height="wrap_content" /> </LinearLayout>

import android.content.DialogInterface;import android.support.v7.app.AlertDialog;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.Menu;import android.view.View;import android.widget.Button;import android.widget.Toast; public class MainActivity extends AppCompatActivity {  private AlertDialog alertDialog1; //信息框 private AlertDialog alertDialog2; //單選框 private AlertDialog alertDialog3; //多選框  private Button button1; private Button button2; private Button button3;  @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); init(); }  public void init(){ button1 = (Button) findViewById(R.id.button1); button2 = (Button) findViewById(R.id.button2); button3 = (Button) findViewById(R.id.button3); }  @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.mian, menu); return true; }  public void showList(View view){ final String[] items = {"列表1", "列表2", "列表3", "列表4"}; AlertDialog.Builder alertBuilder = new AlertDialog.Builder(this); alertBuilder.setTitle("這是列表框"); alertBuilder.setItems(items, new DialogInterface.OnClickListener() {  @Override  public void onClick(DialogInterface dialogInterface, int i) {  Toast.makeText(MainActivity.this, items[i], Toast.LENGTH_SHORT).show();  alertDialog1.dismiss();  } }); alertDialog1 = alertBuilder.create(); alertDialog1.show(); }  public void showSingleAlertDialog(View view){ final String[] items = {"單選1", "單選2", "單選3", "單選4"}; AlertDialog.Builder alertBuilder = new AlertDialog.Builder(this); alertBuilder.setTitle("這是單選框"); alertBuilder.setSingleChoiceItems(items, 0, new DialogInterface.OnClickListener() {  @Override  public void onClick(DialogInterface dialogInterface, int i) {  Toast.makeText(MainActivity.this, items[i], Toast.LENGTH_SHORT).show();  } });  alertBuilder.setPositiveButton("確定", new DialogInterface.OnClickListener() {  @Override  public void onClick(DialogInterface dialogInterface, int i) {  alertDialog2.dismiss();  } });  alertBuilder.setNegativeButton("取消", new DialogInterface.OnClickListener() {  @Override  public void onClick(DialogInterface dialogInterface, int i) {  alertDialog2.dismiss();  } });  alertDialog2 = alertBuilder.create(); alertDialog2.show(); }  public void showMutilAlertDialog(View view){ final String[] items = {"多選1", "多選2", "多選3", "多選4"}; AlertDialog.Builder alertBuilder = new AlertDialog.Builder(this); alertBuilder.setTitle("這是多選框"); /**  *第一個參數:彈出框的消息集合，一般為字符串集合  * 第二個參數：默認被選中的，布爾類數組  * 第三個參數：勾選事件監聽  */ alertBuilder.setMultiChoiceItems(items, null, new DialogInterface.OnMultiChoiceClickListener() {  @Override  public void onClick(DialogInterface dialogInterface, int i, boolean isChecked) {  if (isChecked){   Toast.makeText(MainActivity.this, "選擇" + items[i], Toast.LENGTH_SHORT).show();  }else {   Toast.makeText(MainActivity.this, "取消選擇" + items[i], Toast.LENGTH_SHORT).show();  }  } }); alertBuilder.setPositiveButton("確定", new DialogInterface.OnClickListener() {  @Override  public void onClick(DialogInterface dialogInterface, int i) {  alertDialog3.dismiss();  } });  alertBuilder.setNegativeButton("取消", new DialogInterface.OnClickListener() {  @Override  public void onClick(DialogInterface dialogInterface, int i) {  alertDialog3.dismiss();  } });   alertDialog3 = alertBuilder.create(); alertDialog3.show(); }}