android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);
    }
}