1.一般對話框

看代碼

public void normalDialog(View v)
    {
        //先得到構造器
        AlertDialog.Builder builder=new AlertDialog.Builder(this);
        builder.setTitle("提示");
        builder.setMessage("是否退出");
        builder.setIcon(R.mipmap.ic_launcher);
        builder.setCancelable(false);//設置是否能點擊其他對話框的其他區域消失
        //設置其確定按鈕監聽事件
        builder.setPositiveButton("確認", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                dialog.dismiss();
            }
        });
        //設置忽視的按鈕
        builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                dialog.dismiss();
            }
        });
        //設置中立的按鈕
        builder.setNeutralButton("忽略", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                dialog.dismiss();
            }
        });
        Dialog dialog=builder.create();
        dialog.show();
    }

bulider的創立必須傳遞一個上下文，而且必須是view類型的，getApplicationContext也會崩潰。

效果如下：

2.列表對話框

public void listDialog(View v)
    {
        final String items[]={"AAA","BBB","CCC"};
        AlertDialog.Builder builder=new AlertDialog.Builder(this);
        builder.setTitle("list對話框");
        builder.setIcon(R.mipmap.ic_launcher);
        builder.setItems(items, new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                Toast.makeText(getApplicationContext(),items[which],Toast.LENGTH_SHORT).show();
                dialog.dismiss();
            }
        });
        builder.setPositiveButton("確定", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                dialog.dismiss();
                Toast.makeText(getApplicationContext(),"確定",Toast.LENGTH_SHORT).show();
            }
        });
        Dialog dialog=builder.create();
        dialog.show();}

列表對話框就不使用setMessage的而是用setItems()方法，第二給個參數傳遞需要顯示的內容。

toast的時候需要注意，傳遞數組單個的內容，我們可以看到onClick接口存在which參數，你點擊哪一個

列表內容，就會獲得那個內容的數組索引值，其實which參數就是監聽器。

3.單選框對話框

public void singleDialog(View v)
   {
       final String items[]={"男","女","未知"};
       AlertDialog.Builder builder=new AlertDialog.Builder(this);
       builder.setTitle("提示");
       builder.setSingleChoiceItems(items, 0, new DialogInterface.OnClickListener() {
           @Override
           public void onClick(DialogInterface dialog, int which) {
               Toast.makeText(getApplicationContext(),items[which],Toast.LENGTH_SHORT).show();

           }
       });
       builder.setPositiveButton("確定", new DialogInterface.OnClickListener() {
           @Override
           public void onClick(DialogInterface dialog, int which) {
               dialog.dismiss();
               Toast.makeText(getApplicationContext(),"確定",Toast.LENGTH_SHORT).show();
           }
       });
       builder.create().show();
   }

builder.setSingleChoiceItems(items, 0, new DialogInterface.OnClickListener()

//第二個參數是默認選擇的內容，0是默認第一個，-1是默認不存在

4.多選對話框

public  void muliDialog(View v)
{
    final String items[]={"籃球","唱","rap"};
    final boolean select[]={false,false,true};
    AlertDialog.Builder builder=new AlertDialog.Builder(this);
    builder.setTitle("愛好");
    builder.setIcon(R.mipmap.ic_launcher);
    builder.setMultiChoiceItems(items, select, new DialogInterface.OnMultiChoiceClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which, boolean isChecked) {
            dialog.dismiss();
        }
    });
    builder.create().show();
}

  builder.setMultiChoiceItems(items, select, new ...）

//第二個參數是默認的選項，傳入boolean的數組類型

5.自定義對話框

自定義對話框可以自己設計自己的對話框，甚至布局也是可以自己設計的。

看下面的代碼

<?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=".MyAlertDialog">
    <EditText
        android:id="@+id/editText_name"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="請輸入用戶名"
        android:ems="10"
        android:inputType="textPersonName"
        ></EditText>
    <EditText
        android:id="@+id/editText_password"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:ems="10"
        android:inputType="textPassword"
        android:hint="請輸入你的密碼"
></EditText>
</LinearLayout>

public void customDialog(View v)
{
    AlertDialog.Builder builder=new AlertDialog.Builder(this);
    builder.setTitle("提示");
    builder.setIcon(R.mipmap.ic_launcher);
    LayoutInflater inflater=getLayoutInflater();
    View layout=inflater.inflate(R.layout.activity_my_alert_dialog,null);
    builder.setView(layout);
    EditText username=(EditText)layout.findViewById(R.id.editText_name);
    EditText password=(EditText)layout.findViewById(R.id.editText_password);
    builder.setPositiveButton("確定", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {
            dialog.dismiss();
        }
    });
    builder.create().show();

}

LayoutInfloat 通過inflate方法把view轉換為可以操作的Java代碼