android - 如何在Android上显示警报对话框？(How do I display an alert dialog on Android?)

Question

I want to display a dialog/popup window with a message to the user that shows "Are you sure you want to delete this entry?"

(我想显示一个对话框/弹出窗口，并向用户显示“您确定要删除此条目吗？”的消息。)

with one button that says 'Delete'.

(一个带有“删除”按钮。)

When Delete is touched, it should delete that entry, otherwise nothing.

(触摸Delete ，它应删除该条目，否则不删除任何条目。)

I have written a click listener for those buttons, but how do I invoke a dialog or popup and its functionality?

(我已经为这些按钮编写了一个单击侦听器，但是如何调用对话框或弹出窗口及其功能？)

  ask by community wiki translate from so

Answer 1

You could use an AlertDialog for this and construct one using its Builder class.

(您可以为此使用AlertDialog并使用其Builder类构造一个AlertDialog 。)

The example below uses the default constructor that only takes in a Context since the dialog will inherit the proper theme from the Context you pass in, but there's also a constructor that allows you to specify a specific theme resource as the second parameter if you desire to do so.

(下面的示例使用默认构造函数，该构造函数仅接受Context因为对话框将从您传入的Context中继承适当的主题，但是如果需要，还有一个构造函数可让您将特定的主题资源指定为第二个参数。这样做。)

new AlertDialog.Builder(context)
    .setTitle("Delete entry")
    .setMessage("Are you sure you want to delete this entry?")

    // Specifying a listener allows you to take an action before dismissing the dialog.
    // The dialog is automatically dismissed when a dialog button is clicked.
    .setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int which) { 
            // Continue with delete operation
        }
     })

    // A null listener allows the button to dismiss the dialog and take no further action.
    .setNegativeButton(android.R.string.no, null)
    .setIcon(android.R.drawable.ic_dialog_alert)
    .show();