四种对话框（dialog）的简单使用方法

有普通对话框，单选对话框，复选对话框，进度条的两种实现方法话不多说，直接上代码

activity_main.xml:

 <?xml version="1.0" encoding="utf-8"?>
 <android.support.constraint.ConstraintLayout 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=".MainActivity">
     <LinearLayout
         android:id="@+id/mainLinearLayout"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
         android:orientation="vertical">
         <Button
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:text="普通对话框"
             android:onClick="normalDialog"/>

         <Button
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:text="单选对话框"
             android:onClick="singleDialog"/>
         <Button
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:text="复选对话框"
             android:onClick="MultiDialog"/>
         <Button
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:text="进度条对话框"
             android:onClick="progressDialog"/>
         <Button
             android:id="@+id/downlodebutton"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:text="进度条对话框"
             android:onClick="progressDialog"/>
     </LinearLayout>

 </android.support.constraint.ConstraintLayout>

MainActivity.java:

 package com.lgqrlchinese.dialogtext;

 import android.app.ProgressDialog;
 import android.content.DialogInterface;
 import android.os.SystemClock;
 import android.support.v7.app.AlertDialog;
 import android.support.v7.app.AppCompatActivity;
 import android.os.Bundle;
 import android.view.View;
 import android.widget.Button;
 import android.widget.LinearLayout;
 import android.widget.ProgressBar;
 import android.widget.Toast;

 public class MainActivity extends AppCompatActivity {
     protected String result;

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

     //普通对话框
     public void normalDialog(View view) {
         //构建器
         AlertDialog.Builder b = new AlertDialog.Builder(this);
         //设置标题
         b.setTitle("普通对话框");
         //设置提示信息
         b.setMessage("是否确定退出");
         //设置图标
         b.setIcon(R.drawable.ic_launcher_background);
         //添加确定按钮
         b.setPositiveButton("确定", new DialogInterface.OnClickListener() {
             @Override
             public void onClick(DialogInterface dialogInterface, int i) {
                 finish();
             }
         });
         //添加取消按钮
         b.setNegativeButton("取消", null);
         //创建对话框
         b.create();
         //显示
         b.show();
     }

     //单选对话框
     public void singleDialog(View view) {
         AlertDialog.Builder b = new AlertDialog.Builder(this);
         b.setTitle("单选对话框");
         //选项内容
         final String item[] = {"A", "B", "C", "D"};
         //setSingleChoiceItems(显示的选项内容，默认值，监听事件)
         b.setSingleChoiceItems(item, -1, new DialogInterface.OnClickListener() {
             @Override
             public void onClick(DialogInterface dialogInterface, int i) {
                 //取出数组中的数据
                 result = item[i];
                 //吐司显示出来
                 Toast.makeText(getApplicationContext(), result, Toast.LENGTH_SHORT).show();
             }
         });
         //设置确定按钮
         b.setPositiveButton("确定", new DialogInterface.OnClickListener() {
             @Override
             public void onClick(DialogInterface dialogInterface, int i) {
                 Toast.makeText(getApplicationContext(), "选择的结果是" + result, Toast.LENGTH_SHORT).show();
             }
         });

         b.create();
         b.show();
     }

     //复选对话框
     public void MultiDialog(View view) {
         AlertDialog.Builder b = new AlertDialog.Builder(this);
         b.setTitle("复选框对话框");
         b.setIcon(R.drawable.ic_launcher_background);
         //设置选项
         final String item[] = {"A", "B", "C", "D"};
         //设置默认值
         final boolean chechedItem[] = {true, false, true, true};
         //设置多选setMultiChoiceItems(选项数组，默认值，监听事件)
         b.setMultiChoiceItems(item, chechedItem, new DialogInterface.OnMultiChoiceClickListener() {
             @Override
             public void onClick(DialogInterface dialogInterface, int i, boolean b) {

             }
         });
         b.setPositiveButton("确定", new DialogInterface.OnClickListener() {
             @Override
             public void onClick(DialogInterface dialogInterface, int i) {
                 StringBuffer stringBuffer = new StringBuffer();
                 for (int i1 = 0; i1 < chechedItem.length; i1++) {
                     if (chechedItem[i1]) {
                         stringBuffer.append(item[i1] + "  ");
                     }
                 }
                 Toast.makeText(getApplicationContext(), stringBuffer.toString(), Toast.LENGTH_SHORT).show();
             }
         });
         b.create();
         b.show();
     }

     //进度条对话框
     /*
      * 在API level 26 中，ProgressDialog被声明不赞成使用，应使用的替代方法是ProgressBar
      * */
     public void progressDialog(View view) {
         final ProgressDialog progressDialog = new ProgressDialog(this);
         //设置标题
         progressDialog.setTitle("正在加载中》》》");
         //设置样式
         progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
         //（模拟下载）线程睡眠
         new Thread() {
             @Override
             public void run() {
                 //设置最大值
                 progressDialog.setMax(100);
                 //设置当前值
                 for (int i = 0; i < 100; i++) {
                     progressDialog.setProgress(i);
                     SystemClock.sleep(500);
                 }
                 progressDialog.dismiss();
             }
         }.start();
         progressDialog.show();
     }

     //进度条对话框（推荐使用）
     public void progerssNow() {
         LinearLayout mainLayout;
         Button downlodebutton;
         mainLayout = findViewById(R.id.mainLinearLayout);
         downlodebutton = findViewById(R.id.downlodebutton);
         final ProgressBar progressBar = new ProgressBar(this, null, android.R.attr.progressBarStyleHorizontal);
         downlodebutton.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View view) {
                 new Thread() {
                     @Override
                     public void run() {

                         progressBar.setMax(100);
                         for (int i = 0; i < 100; i++) {
                             progressBar.setProgress(i);
                             SystemClock.sleep(12);
                         }

                     }
                 }.start();
             }
         });
         mainLayout.addView(progressBar);
     }
 }