AlertDialog的几种用法

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout
 3     xmlns:android="http://schemas.android.com/apk/res/android"
 4     xmlns:app="http://schemas.android.com/apk/res-auto"
 5     xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
 6     android:layout_height="match_parent"
 7     android:orientation="vertical"
 8     tools:context="com.example.lesson7_3_id19_alertdialog.MainActivity">
 9 
10     <Button
11         android:layout_width="match_parent"
12         android:layout_height="wrap_content"
13         android:text="简单的dialog"
14         android:onClick="dialog_1"/>
15     <Button
16         android:layout_width="match_parent"
17         android:layout_height="wrap_content"
18         android:text="列表的dialog"
19         android:onClick="dialog_2"/>
20     <Button
21         android:layout_width="match_parent"
22         android:layout_height="wrap_content"
23         android:text="单选的dialog"
24         android:onClick="dialog_3"/>
25     <Button
26         android:layout_width="match_parent"
27         android:layout_height="wrap_content"
28         android:text="多选的dialog"
29         android:onClick="dialog_4"/>
30     <Button
31         android:layout_width="match_parent"
32         android:layout_height="wrap_content"
33         android:text="自定义View的dialog"
34         android:onClick="dialog_5"/>
35     <Button
36         android:layout_width="match_parent"
37         android:layout_height="wrap_content"
38         android:text="使用adapter的dialog"
39         android:onClick="dialog_6"/>
40 </LinearLayout>

 1 package com.example.lesson7_3_id19_alertdialog;  2  3 import android.app.AlertDialog;  4 import android.content.DialogInterface;  5 import android.os.Bundle;  6 import android.support.v7.app.AppCompatActivity;  7 import android.view.View;  8 import android.widget.ArrayAdapter;  9 import android.widget.EditText;  10 import android.widget.Toast;  11  12 public class MainActivity extends AppCompatActivity {  13  14  @Override  15 protected void onCreate(Bundle savedInstanceState) {  16 super.onCreate(savedInstanceState);  17  setContentView(R.layout.activity_main);  18  }  19 public void dialog_1(View v){  20 AlertDialog.Builder builder = new AlertDialog.Builder(this);  21  builder.setIcon(R.mipmap.ic_launcher_round);  22  23 builder.setTitle("标题栏");  24 builder.setMessage("正文部分，简单的文本");  25 builder.setPositiveButton("确定",new DialogInterface.OnClickListener() {  26  @Override  27 public void onClick(DialogInterface dialog, int which) {  28 Toast.makeText(MainActivity.this, "点击了确定", Toast.LENGTH_SHORT).show();  29  }  30  });  31 builder.setNegativeButton("取消",null);  32 builder.setNeutralButton("中立",null);  33 AlertDialog alertDialog = builder.create();  34  alertDialog.show();  35  36  }  37 private String [] item = {"游戏","运动","电影","旅游","看书"};  38 public void dialog_2(View v){  39 AlertDialog.Builder builder = new AlertDialog.Builder(this);  40 builder.setTitle("请选择");  41 builder.setItems(item, new DialogInterface.OnClickListener() {  42  @Override  43 public void onClick(DialogInterface dialog, int which) {  44 Toast.makeText(MainActivity.this, "选择了"+item[which], Toast.LENGTH_SHORT).show();  45  }  46  });  47 // 取消可以不添加  48 //builder.setNegativeButton("取消",null);  49 AlertDialog alertDialog = builder.create();  50  alertDialog.show();  51  52  }  53 int index;  54 public void dialog_3(View v){  55 AlertDialog.Builder builder = new AlertDialog.Builder(this);  56 builder.setTitle("请选择");  57 builder.setSingleChoiceItems(item, index, new DialogInterface.OnClickListener() {  58  @Override  59 public void onClick(DialogInterface dialog, int which) {  60 index = which;  61  }  62  });  63 builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {  64  @Override  65 public void onClick(DialogInterface dialog, int which) {  66 Toast.makeText(MainActivity.this, "选择了"+item[index], Toast.LENGTH_SHORT).show();  67  }  68  });  69 builder.setNegativeButton("取消",null);  70 AlertDialog alertDialog = builder.create();  71  alertDialog.show();  72  }  73 // 设置boolean数组所有的选项设置默认没选  74 boolean[] bools = {false,false,false,false,false};  75 public void dialog_4(View v){  76 AlertDialog.Builder builder = new AlertDialog.Builder(this);  77 builder.setTitle("请选择");  78 builder.setMultiChoiceItems(item, bools, new DialogInterface.OnMultiChoiceClickListener() {  79  @Override  80 public void onClick(DialogInterface dialog, int which, boolean isChecked) {  81 bools[which] = isChecked;  82  }  83  });  84 builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {  85  @Override  86 public void onClick(DialogInterface dialog, int which) {  87 StringBuffer sb = new StringBuffer();  88 for (int i = 0; i < item.length; i++) {  89 if (bools[i]) {  90 sb.append(item[i] + " ");  91  }  92  }  93 Toast.makeText(MainActivity.this, "选择了" + sb.toString(), Toast.LENGTH_SHORT).show();  94  }  95  });  96 builder.setNegativeButton("取消",null);  97 AlertDialog alertDialog = builder.create();  98  alertDialog.show();  99  } 100 public void dialog_5(View v){ 101 AlertDialog.Builder builder = new AlertDialog.Builder(this); 102 builder.setTitle("连接wifi"); 103 final EditText et = new EditText(this); 104 et.setHint("请输入密码"); 105 et.setSingleLine(true); 106  builder.setView(et); 107 builder.setNegativeButton("取消",null); 108 builder.setPositiveButton("确定", new DialogInterface.OnClickListener() { 109  @Override 110 public void onClick(DialogInterface dialog, int which) { 111 String password = et.getText().toString(); 112 if (password.equals("123456")) { 113 Toast.makeText(MainActivity.this, "连接成功", Toast.LENGTH_SHORT).show(); 114 }else{ 115 Toast.makeText(MainActivity.this, "密码错误", Toast.LENGTH_SHORT).show(); 116  } 117  } 118  }); 119 AlertDialog alertDialog = builder.create(); 120  alertDialog.show(); 121 122  } 123 public void dialog_6(View v){ 124 ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,item); 125 AlertDialog.Builder builder = new AlertDialog.Builder(this); 126 builder.setTitle("使用适配器"); 127 builder.setAdapter(adapter, new DialogInterface.OnClickListener() { 128  @Override 129 public void onClick(DialogInterface dialog, int which) { 130 Toast.makeText(MainActivity.this, "选择了"+item[which], Toast.LENGTH_SHORT).show(); 131  } 132  }); 133 AlertDialog alertDialog = builder.create(); 134  alertDialog.show(); 135  } 136 }