javascript - 无法捕获 Android Tv webview 应用程序上的键码(HTML+Javascript)

Question

我正在尝试为我的网站开发一个 Android 电视应用程序。经过研究后，我开始使用 web-view 来加载包含 html-5 和 JavaScript 的 Web 应用程序。

该应用程序在 WebView 上加载良好，我什至可以在电视模拟器上正确导航，但一旦我在 Nexus Player 上部署该应用程序，该应用程序就不会接受 Enter 事件。当我点击游戏 Controller 上的按钮 A 时，点击 Nexus Player 附带的游戏 Controller 上的 A 按钮时会出现错误 ------"您没有可以执行此操作的应用”

之后，我创建了一个虚拟应用程序来在屏幕上显示键事件以进行调试，并且在捕获所有键事件的情况下工作得很好。

我发现，因为它是一个基于 htnl5 和 javascript 的应用程序，所以 NP 不兼容。我对此进行了很多研究，但似乎找不到任何可靠的东西。确实需要一个指针才能使其正常工作。

以下是加载 web 应用程序的 webview 代码:

public class ExampleActivity extends Activity implements DialogInterface.OnKeyListener
{
    webView = (VideoEnabledWebView)findViewById(R.id.webView);
            mButton1=(Button)findViewById(R.id.btn);

            webView.addJavascriptInterface(new MyJavaScriptInterface(this),"AndroidFunction");
            // Initialize the VideoEnabledWebChromeClient and set event handlers
            View nonVideoLayout = findViewById(R.id.nonVideoLayout); // Your own view, read class comments
            ViewGroup videoLayout = (ViewGroup)findViewById(R.id.videoLayout); // Your own view, read class comments
            //noinspection all
            View loadingView = getLayoutInflater().inflate(R.layout.view_loading_video, null); // Your own view, read class comments
            webChromeClient = new VideoEnabledWebChromeClient(nonVideoLayout, videoLayout, loadingView, webView) // See all available constructors...
            {
                // Subscribe to standard events, such as onProgressChanged()...
                @Override
                public void onProgressChanged(WebView view, int progress) {
                    // Your code...
                }
            };
            webChromeClient.setOnToggledFullscreen(new VideoEnabledWebChromeClient.ToggledFullscreenCallback() {
                @Override
                public void toggledFullscreen(boolean fullscreen) {
                    // Your code to handle the full-screen change, for example showing and hiding the title bar. Example:
                    if (fullscreen) {
                        WindowManager.LayoutParams attrs = getWindow().getAttributes();
                        attrs.flags |= WindowManager.LayoutParams.FLAG_FULLSCREEN;
                        attrs.flags |= WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON;
                        getWindow().setAttributes(attrs);
                        if (android.os.Build.VERSION.SDK_INT >= 14) {
                            //noinspection all
                            getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LOW_PROFILE);
                        }
                    } else {
                        WindowManager.LayoutParams attrs = getWindow().getAttributes();
                        attrs.flags &= ~WindowManager.LayoutParams.FLAG_FULLSCREEN;
                        attrs.flags &= ~WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON;
                        getWindow().setAttributes(attrs);
                        if (android.os.Build.VERSION.SDK_INT >= 14) {
                            //noinspection all
                            getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_VISIBLE);
                        }
                    }

                }
            });
            webView.setWebChromeClient(webChromeClient);

            // Navigate anywhere you want, but consider that this classes have only been tested on YouTube's mobile site
            webView.loadUrl("http://html5dev.anorakstech.com/iads/");
            mButton1.setOnClickListener(new Button.OnClickListener() {
                public void onClick(View v) {
                    webView.loadUrl("javascript:fillContent()");
                }
            });
}

这是我用来从 Nexus 播放器附带的 Real Controller 获取关键事件的代码

@Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        super.onKeyDown(keyCode, event);

        Toast.makeText(ExampleActivity.this, "Key Pressed:"+keyCode, Toast.LENGTH_LONG).show();
        webView.loadUrl("javascript:fillContent()");

        switch(keyCode)
        {
            case KeyEvent.ACTION_DOWN:

                Toast.makeText(ExampleActivity.this, "Key Down"+keyCode, Toast.LENGTH_LONG).show();
                return true;

            case KeyEvent.ACTION_UP:
            Log.v("EA", "Keycode" + event.getKeyCode());
            Toast.makeText(ExampleActivity.this, "Key Released"+event.getKeyCode(), Toast.LENGTH_LONG).show();
            return true;

            case KeyEvent.KEYCODE_ENTER:
                Log.v("EA","Keycode"+event.getKeyCode());
                Toast.makeText(ExampleActivity.this, "Pressed Enter"+event.getKeyCode(), Toast.LENGTH_LONG).show();
                return true;
            case KeyEvent.KEYCODE_DPAD_UP:
                Log.v("EA","Keycode"+event.getKeyCode());
                Toast.makeText(ExampleActivity.this, "Pressed 19", Toast.LENGTH_LONG).show();
                return true;
            case KeyEvent.KEYCODE_DPAD_DOWN:
                Toast.makeText(ExampleActivity.this, "Pressed 20", Toast.LENGTH_LONG).show();
                return true;
            case KeyEvent.KEYCODE_DPAD_LEFT:
                Log.v("EA","Pressed 21");
                Toast.makeText(ExampleActivity.this, "Pressed 21", Toast.LENGTH_LONG).show();
                return true;

            case KeyEvent.KEYCODE_DPAD_RIGHT:
                Toast.makeText(ExampleActivity.this, "Pressed 22", Toast.LENGTH_LONG).show();

                return true;
            case KeyEvent.KEYCODE_CAMERA:
                Toast.makeText(ExampleActivity.this, "Pressed Camera Button", Toast.LENGTH_LONG).show();

                return true;
            case KeyEvent.KEYCODE_1:
                Toast.makeText(ExampleActivity.this, "Pressed 1", Toast.LENGTH_LONG).show();
                return true;
            case KeyEvent.KEYCODE_HOME:
                Toast.makeText(ExampleActivity.this, "Pressed Home Button", Toast.LENGTH_LONG).show();
                return true;

            case KeyEvent.KEYCODE_BACK:
                Toast.makeText(ExampleActivity.this, "Pressed Back Button"+event.getKeyCode(), Toast.LENGTH_LONG).show();
                Intent result = new Intent("Complete");
                setResult(Activity.RESULT_OK, result);
                finish();
                return true;

            case KeyEvent.KEYCODE_BUTTON_A:
                Toast.makeText(ExampleActivity.this, "Pressed 96", Toast.LENGTH_LONG).show();
                return true;
            case KeyEvent.KEYCODE_BUTTON_B:
                Toast.makeText(ExampleActivity.this, "Pressed 97", Toast.LENGTH_LONG).show();
                return true;
            case KeyEvent.KEYCODE_BUTTON_X:
                Toast.makeText(ExampleActivity.this, "Pressed 99", Toast.LENGTH_LONG).show();
                return true;

            case KeyEvent.KEYCODE_BUTTON_Y:
                Toast.makeText(ExampleActivity.this, "Pressed 100", Toast.LENGTH_LONG).show();

                return true;
        }

        return false;
    }

我在这里无法理解的是，它不会从 keydown 方法中显示任何 toast，但当我从应用程序退出 Keycode_Back 事件(为 4)以及除 BACK 事件之外的任何其他 keyevent 时，它会显示 toast在 Nexus 播放器或模拟器上都没有按照上面的代码捕获它或显示任何 toast --真的让我发疯。

任何可以为我指明正确方向的建议将不胜感激。

编辑1:我现在可以在 logcat 中获取 keyevnts，但它仍然不显示 Toast，并且我仍然不断收到“您没有可以在单击按钮 A 上执行此操作的应用程序”

Answer 1

Are there any other components that may be consuming the key events?

如果没有，则删除super.onKeyDown(keyCode, event);

虽然这可能不是您的问题，from documentation :

JavaScript is disabled in a WebView by default. You can enable it through the WebSettings attached to your WebView. You can retrieve WebSettings with getSettings(), then enable JavaScript with setJavaScriptEnabled().