将View.OnKeyListener附加到SurfaceView [英] Attaching a View.OnKeyListener to a SurfaceView

问题描述

我需要将自定义触摸和硬件键处理附加到SurfaceView.我需要使用单独的侦听器(而不是将dispatchKeyEvent()和dispatchTouchEvent()方法添加到SurfaceView)，因为我将向第三方提供自定义事件处理功能以在其SurfaceView上使用，并且希望将其分开.

I need to attach custom touch and hardware key handling to a SurfaceView. I need to use separate listeners (rather than adding the dispatchKeyEvent() and dispatchTouchEvent() methods to the SurfaceView), as I will be providing the custom event handling functionality to a third party to use on their SurfaceView, and I want to keep it separate.

我的自定义 touch 事件处理程序工作正常，但是 key 事件处理程序无法捕获任何事件.这是我的设置方法:

My custom touch event handler works fine, but the key event handler doesn't catch any events. Here's how I'm setting them:

public MyGLSurfaceView(Context c, AttributeSet a) {
    // Other setup...
    setOnTouchListener(new MyTouchListener()); // Works
    setOnKeyListener(new MyKeyListener()); // No events captured

}

这是我的主要倾听者:

public class MyKeyListener implements View.OnKeyListener {
    @Override
    public boolean onKey(View v, int key, KeyEvent e) {
        System.out.println("A hardware key was pressed!");
        return true;
    }
}

我应该将键侦听器附加到与SurfaceView不同的对象吗?该视图位于Dialog内部，因此我可以将我的关键侦听器附加到该视图上吗?

Should I be attaching the key listener to a different object than the SurfaceView? The view sits inside a Dialog, so could I attach my key listener to that instead?

推荐答案

默认情况下，SurfaceView无法聚焦，因此不会广播关键事件. 您需要激活焦点:

By default, the SurfaceView is not focusable and then doesn't broadcast keyevent. You need to activate focus :

setFocusable(true);
setFocusableInTouchMode(true);
requestFocus();
//And now you set your OnKeyEventListener

请注意，通过失去另一视图的焦点，该视图将不会收到任何事件，除非它再次获得焦点.

Be aware that by loosing the focus for another view, this one will not receive any events until it receives the focus again.

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