Question

我正在尝试向我的GDK应用添加菜单。我正在使用沉浸感，并按照此处的说明进行操作：https://developers.google.com/glass/develop/gdk/ui/immersion-menus

所有内容编译好，但实际的选项菜单不起作用。当我点击触摸板时没有任何反应。事实上，这里似乎是一个额外的副作用，现在没有按键工作。我甚至无法向下滑动以关闭应用程序。我的玻璃基本上冻结，直到我强行用adb删除应用程序。

这是我的onKeyDown方法：

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
    if (keyCode == KeyEvent.KEYCODE_DPAD_CENTER) {
        openOptionsMenu();
        return true;
    }
    return false;
}

我做错了什么？我完全从文档中复制了它。我是否需要将事件传递给超类或其他什么？

Answer 1

我刚刚将相机预览和缩放项目上传到https://github.com/xjefftang/smartcamera的github，其中包含一个带菜单的活动。你可能想看一下。或者查看源代码以了解如何实现它：

public class ImageViewActivity extends Activity {
    public static String TAG = "ImageViewActivity";
    ImageView mImageview;
    private GestureDetector mGestureDetector;
    File mPictureFilePath;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.imageview);
        Bundle extras = getIntent().getExtras();
        mPictureFilePath = (File)extras.get("picturefilepath");

        Log.v(TAG, "pictureFilePath=" + mPictureFilePath.getAbsolutePath());
        mImageview =  (ImageView) findViewById(R.id.picture);

        Bitmap myBitmap = BitmapFactory.decodeFile(mPictureFilePath.getAbsolutePath());
        int h = (int) ( myBitmap.getHeight() * (640.0 / myBitmap.getWidth()) );

        Bitmap scaled = Bitmap.createScaledBitmap(myBitmap, 640, h, true);
        mImageview.setImageBitmap(scaled);        

        mGestureDetector = new GestureDetector(this);

        mGestureDetector.setBaseListener(new GestureDetector.BaseListener() {
            @Override
            public boolean onGesture(Gesture gesture) {
                if (gesture == Gesture.TAP) {
                    Log.v(TAG, "TAP");
                    openOptionsMenu();

                    return true;
                } else if (gesture == Gesture.TWO_TAP) {
                    Log.v(TAG, "TWO_TAP");
                    return true;
                } else if (gesture == Gesture.SWIPE_RIGHT) {
                    Log.v(TAG, "SWIPE_RIGHT");
                    return true;
                } else if (gesture == Gesture.SWIPE_LEFT) {
                    return true;
                } else if (gesture == Gesture.LONG_PRESS) {
                    Log.v(TAG, "LONG_PRESS");                   
                    return true;
                } else if (gesture == Gesture.SWIPE_DOWN) {
                    Log.v(TAG, "SWIPE_DOWN");
                    return false;
                } else if (gesture == Gesture.SWIPE_UP) {
                    Log.v(TAG, "SWIPE_UP");
                    return true;
                } else if (gesture == Gesture.THREE_LONG_PRESS) {
                    Log.v(TAG, "THREE_LONG_PRESS");
                    return true;
                } else if (gesture == Gesture.THREE_TAP) {
                    Log.v(TAG, "THREE_TAP");
                    return true;
                } else if (gesture == Gesture.TWO_LONG_PRESS) {
                    Log.v(TAG, "TWO_LONG_PRESS");
                    return true;
                } else if (gesture == Gesture.TWO_SWIPE_DOWN) {
                    Log.v(TAG, "TWO_SWIPE_DOWN");
                    return false;
                } else if (gesture == Gesture.TWO_SWIPE_LEFT) {
                    Log.v(TAG, "TWO_SWIPE_LEFT");
                    return true;
                } else if (gesture == Gesture.TWO_SWIPE_RIGHT) {
                    Log.v(TAG, "TWO_SWIPE_RIGHT");
                    return true;
                } else if (gesture == Gesture.TWO_SWIPE_UP) {
                    Log.v(TAG, "TWO_SWIPE_UP");
                    return true;
                }

                return false;
            }
        });
    }



    public boolean onGenericMotionEvent(MotionEvent event) {
        if (mGestureDetector != null) {
            return mGestureDetector.onMotionEvent(event);
        }
        return false;
    }        




    @Override
    public boolean onCreateOptionsMenu(Menu menu) {

        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.imageview, menu);

        return true;
    } 

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
        case R.id.upload:
            Uri imgUri = Uri.parse("file://" + mPictureFilePath.getAbsolutePath());
            Intent shareIntent = ShareCompat.IntentBuilder.from(this)
                    .setText("Share image taken by Glass")
                    .setType("image/jpeg")
                    .setStream(imgUri )
                    .getIntent()
                    .setPackage("com.google.android.apps.docs");

            startActivity(shareIntent);         

            return true;

        case R.id.delete:
            mPictureFilePath.delete();
            Toast.makeText(ImageViewActivity.this, "Deleted", Toast.LENGTH_SHORT).show();
            finish();
            return true;


        default:
            return super.onOptionsItemSelected(item);
        }
    }             

}

Answer 2

这是一个最小的实现，它既可以打开菜单，也可以向下滑动以关闭当前的Activity。如果您有一个Activity Immersion，它将关闭您的应用程序。

// Display menu when user taps on touchpad or dismisses this activity if user swipes down
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
      if (keyCode == KeyEvent.KEYCODE_DPAD_CENTER) {
          openOptionsMenu();
          return true;
      } else if (keyCode == KeyEvent.KEYCODE_BACK) {
          finish();
      }
      return false;
}

实现Menu时出现奇怪的KeyDown行为

2 个答案: