是的,我知道有AlertDialog。但我很惊讶地知道在Android中显示对话框有多么困难(好吧,至少不是程序员友好的)。

我曾经是一名。net开发人员,我想知道在android上是否有类似的功能?

if (MessageBox.Show("Sure?", "", MessageBoxButtons.YesNo) == DialogResult.Yes){
    // Do something...
}

当前回答

史蒂夫的回答是正确的,尽管有些片段过时了。下面是一个FragmentDialog的例子。

类:

public class SomeDialog extends DialogFragment {

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        return new AlertDialog.Builder(getActivity())
            .setTitle("Title")
            .setMessage("Sure you wanna do this!")
            .setNegativeButton(android.R.string.no, new OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    // do nothing (will close dialog)
                }
            })
            .setPositiveButton(android.R.string.yes,  new OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    // do something
                }
            })
            .create();
    }
}

开始对话:

            FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
            // Create and show the dialog.
            SomeDialog newFragment = new SomeDialog ();
            newFragment.show(ft, "dialog");

您还可以让类实现onClickListener,并使用它来代替嵌入式侦听器。

其他回答

这里所有的答案都归结为冗长且不利于读者的代码:这正是提问者试图避免的。对我来说,最简单的方法是在这里使用lambdas:

new AlertDialog.Builder(this)
        .setTitle("Are you sure?")
        .setMessage("If you go back you will loose any changes.")
        .setPositiveButton("Yes", (dialog, which) -> {
            doSomething();
            dialog.dismiss();
        })
        .setNegativeButton("No", (dialog, which) -> dialog.dismiss())
        .show();

Android中的Lambdas需要retrolambda插件(https://github.com/evant/gradle-retrolambda),但无论如何,它对编写更清晰的代码非常有帮助。

Kotlin在Android::

    override fun onBackPressed() {
        confirmToCancel()
    }

    private fun confirmToCancel() {
        AlertDialog.Builder(this)
            .setTitle("Title")
            .setMessage("Do you want to cancel?")
            .setCancelable(false)
            .setPositiveButton("Yes") {
                dialog: DialogInterface, _: Int ->
                dialog.dismiss()
                // for sending data to previous activity use
                // setResult(response code, data)
                finish()
            }
            .setNegativeButton("No") {
                dialog: DialogInterface, _: Int ->
                dialog.dismiss()
            }
            .show()
    } 

显示对话框匿名作为命令链&没有定义另一个对象:

 new AlertDialog.Builder(this).setTitle("Confirm Delete?")
                        .setMessage("Are you sure?")
                        .setPositiveButton("YES",
                                new DialogInterface.OnClickListener() {
                                    public void onClick(DialogInterface dialog, int which) {

                                       // Perform Action & Dismiss dialog                                 
                                        dialog.dismiss();
                                    }
                                })
                        .setNegativeButton("NO", new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which) {
                                // Do nothing
                                dialog.dismiss();
                            }
                        })
                        .create()
                        .show();

谢谢。我使用API级别2 (Android 1.1),而不是BUTTON_POSITIVE和BUTTON_NEGATIVE,我必须使用BUTTON1和BUTTON2。

在芬兰湾的科特林:

AlertDialog.Builder(this)
    .setTitle(R.string.question_title)
    .setMessage(R.string.question_message)
    .setPositiveButton(android.R.string.yes) { _, _ -> yesClicked() }
    .setNegativeButton(android.R.string.no) { _, _ -> noClicked() }
    .show()