AlertDialog的几种用法

xml代码：

 <?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="com.example.lesson7_3_id19_alertdialog.MainActivity">

     <Button
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:text="简单的dialog"
         android:onClick="dialog_1"/>
     <Button
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:text="列表的dialog"
         android:onClick="dialog_2"/>
     <Button
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:text="单选的dialog"
         android:onClick="dialog_3"/>
     <Button
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:text="多选的dialog"
         android:onClick="dialog_4"/>
     <Button
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:text="自定义View的dialog"
         android:onClick="dialog_5"/>
     <Button
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:text="使用adapter的dialog"
         android:onClick="dialog_6"/>
 </LinearLayout>

java代码：

 package com.example.lesson7_3_id19_alertdialog;

 import android.app.AlertDialog;
 import android.content.DialogInterface;
 import android.os.Bundle;
 import android.support.v7.app.AppCompatActivity;
 import android.view.View;
 import android.widget.ArrayAdapter;
 import android.widget.EditText;
 import android.widget.Toast;

 public class MainActivity extends AppCompatActivity {

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
     }
     public void dialog_1(View v){
         AlertDialog.Builder builder = new AlertDialog.Builder(this);
         builder.setIcon(R.mipmap.ic_launcher_round);

         builder.setTitle("标题栏");
         builder.setMessage("正文部分，简单的文本");
         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",null);
         builder.setNeutralButton("中立",null);
         AlertDialog alertDialog = builder.create();
         alertDialog.show();

     }
     private String [] item = {"游戏","运动","电影","旅游","看书"};
     public void dialog_2(View v){
         AlertDialog.Builder builder = new AlertDialog.Builder(this);
         builder.setTitle("请选择");
         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();

     }
     int index;
     public void dialog_3(View v){
         AlertDialog.Builder builder = new AlertDialog.Builder(this);
         builder.setTitle("请选择");
         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();
     }
     // 设置boolean数组所有的选项设置默认没选
     boolean[] bools = {false,false,false,false,false};
     public void dialog_4(View v){
         AlertDialog.Builder builder = new AlertDialog.Builder(this);
         builder.setTitle("请选择");
         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();
     }
     public void dialog_5(View v){
         AlertDialog.Builder builder = new AlertDialog.Builder(this);
         builder.setTitle("连接wifi");
         final EditText et = new EditText(this);
         et.setHint("请输入密码");
         et.setSingleLine(true);
         builder.setView(et);
         builder.setNegativeButton("取消",null);
         builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
             @Override
             public void onClick(DialogInterface dialog, int which) {
                 String password = et.getText().toString();
                 if (password.equals("123456")) {
                     Toast.makeText(MainActivity.this, "连接成功", Toast.LENGTH_SHORT).show();
                 }else{
                     Toast.makeText(MainActivity.this, "密码错误", Toast.LENGTH_SHORT).show();
                 }
             }
         });
         AlertDialog alertDialog = builder.create();
         alertDialog.show();

     }
     public void dialog_6(View v){
         ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,item);
         AlertDialog.Builder builder = new AlertDialog.Builder(this);
         builder.setTitle("使用适配器");
         builder.setAdapter(adapter, new DialogInterface.OnClickListener() {
             @Override
             public void onClick(DialogInterface dialog, int which) {
                 Toast.makeText(MainActivity.this, "选择了"+item[which], Toast.LENGTH_SHORT).show();
             }
         });
         AlertDialog alertDialog = builder.create();
         alertDialog.show();
     }
 }