它的接口是用来检测从对话框类（Android SDK中）关键事件？ [英] Which interface is used to detect key events from the Dialog class (Android SDK)?

问题描述

我已经创建了一个要求用户preSS的关键一个简单的自定义对话框。这样做的目的是为了让我能够映射无论他们的关键preSS在应用程序的功能。不幸的是，我无法弄清楚什么是用来检测的关键事件正确的接口。我的阶级是这样的：

I've created a simple custom dialog that asks users to "Press a key". The purpose of this is so that I can map whatever key they press to a function in the app. Unfortunately, I can not figure out what is the correct interface to use to detect the key events. My class looks like this:

public class ScancodeDialog extends Dialog implements OnKeyListener
{

    public ScancodeDialog( Context context )
    {
        super(context);
        setContentView( R.layout.scancode_dialog );
        setTitle( "Key Listener" );
        TextView text = (TextView) findViewById( R.id.scancode_text );
        text.setText( "Please press a button.." );
        ImageView image = (ImageView) findViewById( R.id.scancode_image );
        image.setImageResource( R.drawable.icon );
        getWindow().setFlags( WindowManager.LayoutParams.FLAG_ALT_FOCUSABLE_IM,
                              WindowManager.LayoutParams.FLAG_ALT_FOCUSABLE_IM );
    }

    @Override
    public boolean onKey( DialogInterface dialog, int keyCode, KeyEvent event )
    {
        if( keyCode != KeyEvent.KEYCODE_MENU )
            dismiss();
        return true;
    }
}

我一直有和没有getWindow（）尝试过。setFlags（）行（这是另一个问题，它并没有帮助我在我的情况建议）。很显然，我会添加更多的功能到后来类，但现在每当用户presses一个关键的对话框应该关闭。然而，安其不会被调用。

I've tried it with and without the getWindow().setFlags() line (that was a suggestion from another question, which didn't help me in my case). Obviously I will add more functionality to the class later, but for now the dialog box should close whenever the user presses a key. However, onKey is never called.

我使用的关键监听器接口从View最初尝试：

I originally tried using the key listener interface from View:

import android.view.View.OnKeyListener;

但由于一个对话框是不是认为，这并不工作。我也尝试从DialogInterface之一：

But since a Dialog is not a view, this didn't work. I also tried the one from DialogInterface:

import android.content.DialogInterface.OnKeyListener;

这似乎是一个更好的选择，因为API表明对话实现DialogInterface，但我仍然没有收到关键事件。任何建议我可以尝试？

This seemed like a better choice, since the API indicates that Dialog implements DialogInterface, but I am still not receiving the key events. Any suggestions I can try?

推荐答案

您从未声明过对话听键。

You never declared the dialog to listen to the keys.

例如：

this.setOnKeyListener(...)

this关键字是指类，它是在..这是一个对话框。

the this keyword is referring to the class that it is in.. which is a Dialog.

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