如何在 Android 上显示警报对话框? [英] How do I display an alert dialog on Android?

问题描述

我想显示一个对话框/弹出窗口，向用户显示一条消息，显示您确定要删除此条目吗?"一个按钮，上面写着删除".当Delete被触摸时，它应该删除该条目，否则什么都没有.

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?" with one button that says 'Delete'. When Delete is touched, it should delete that entry, otherwise nothing.

我已经为这些按钮编写了一个点击侦听器，但如何调用对话框或弹出窗口及其功能?

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

推荐答案

您可以为此使用 AlertDialog 并使用其 Builder 类构建一个.下面的示例使用默认构造函数，该构造函数只接受 Context，因为对话框将从您传入的 Context 继承正确的主题，但还有一个构造函数允许您将特定主题资源指定为如果您愿意，可以使用第二个参数.

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

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();

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