Android的几种弹出框

【Android的几种弹出框】观书散遗帙，探古穷至妙。这篇文章主要讲述Android的几种弹出框相关的知识，希望能为你提供帮助。
项目效果图:

文章图片

新建一个项目,结构图如下所示:

文章图片

activity_main.xml:

< ?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=".MainActivity"> < TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Hello World!" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintLeft_toLeftOf="parent" app:layout_constraintRight_toRightOf="parent" app:layout_constraintTop_toTopOf="parent" /> < Button android:onClick="click1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="普通对话框" /> < Button android:onClick="click2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="单选对话框" /> < Button android:onClick="click3" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="多选对话框" /> < Button android:onClick="click4" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="进度条对话框" /> < /LinearLayout>

MainActivity:

package com.demo.duihuakuang; import android.app.ProgressDialog; import android.content.Context; import android.content.DialogInterface; import android.os.Build; 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.Toast; import org.w3c.dom.Text; public class MainActivity extends AppCompatActivity {@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); }public void click1(View view) {AlertDialog.Builder builder = new AlertDialog.Builder(this); builder.setTitle("警告"); builder.setMessage("世界上最遥远的距离是没有网"); builder.setPositiveButton("确定", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { System.out.println("点了确定"); } }); builder.setNegativeButton("取消", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { System.out.println("点了取消"); } }); //一样要show builder.show(); }//点击按钮弹出一个单选对话框 public void click2(View view) { AlertDialog.Builder builder = new AlertDialog.Builder(this); builder.setTitle("请选择您喜欢的课程"); final String items[] = {"android", "ios", "c", "C++", "html", "C#"}; //-1代表没有条目被选中 builder.setSingleChoiceItems(items, -1, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { //1.把选中的条目取出来 String item = items[which]; Toast.makeText(getApplicationContext(),item.toString(),Toast.LENGTH_LONG).show(); //2.然后把对话框关闭 dialog.dismiss(); } }); //一样要show builder.show(); }//多选对话框 public void click3(View view) { System.out.println("点击了"); AlertDialog.Builder builder = new AlertDialog.Builder(this); builder.setTitle("请选择你喜欢吃的水果"); final String items[] = {"香蕉", "黄瓜", "冬瓜", "哈密瓜", "梨", "柚子"}; final boolean [] checkedItems ={true,false,false,false,false,true}; builder.setMultiChoiceItems(items, checkedItems, new DialogInterface.OnMultiChoiceClickListener() { @Override public void onClick(DialogInterface dialog, int which, boolean isChecked) {} }); //把选中的挑选出来 builder.setPositiveButton("确定", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { StringBuffer sb = new StringBuffer(); //把选中的条目的数据取出来 for (int i = 0; i < checkedItems.length ; i++) { //判断下选中的 if(checkedItems[i]){ String fruit = items[i]; sb.append(fruit+""); } Toast.makeText(getApplicationContext(),sb.toString(),Toast.LENGTH_LONG).show(); //2.然后把对话框关闭 dialog.dismiss(); } } }); //一样要show builder.show(); }//进度加载框 public void click4(View view) {final ProgressDialog dialog = new ProgressDialog(this); dialog.setTitle("正在玩命加载中..."); //设置一下进度条的样式 dialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL); //创建一个子线程 new Thread(){ @Override public void run() { //设置进度条的最大值 dialog.setMax(100); //设置当前进度 for (int i = 0; i < =100 ; i++) { dialog.setProgress(i); //睡眠一会儿 SystemClock.sleep(50); } //关闭对话框 dialog.dismiss(); } }.start(); //一样要show dialog.show(); } }