我正在尝试使用电视遥控器上的以下按钮制作Android电视应用:up
,down
,left
,right
,{ {1}},center/enter
,home
。
我需要做哪些课程/活动?
我一直在尝试使用此处的back
代码:Link dev android.
但是当我尝试在带有方向键盘输入的电视上使用Android模拟器进行测试时,它不起作用。有了很多Log语句,我发现我的问题是以下几行代码:
Dpad
我得到的输出如下(并打印2次,即使我只按一次按钮):
if (event instanceof MotionEvent) {
// Use the hat axis value to find the D-pad direction
MotionEvent motionEvent = (MotionEvent) event;
float xaxis = motionEvent.getAxisValue(MotionEvent.AXIS_HAT_X);
float yaxis = motionEvent.getAxisValue(MotionEvent.AXIS_HAT_Y);
Log.d("test", "xaxis = " + String.valueOf(xaxis) +
" yaxis = " + String.valueOf(yaxis));
}
Log.d("test", "returning directionPressed as - " +
String.valueOf(directionPressed));
return directionPressed;
我看到09-13 14:45:05.643 1489-1489/omgandroid D/test: is motion event = true
09-13 14:45:05.643 1489-1489/omgandroid D/test: is key event = false
09-13 14:45:05.643 1489-1489/omgandroid D/test: xaxis = 0.0 yaxis = 0.0
09-13 14:45:05.643 1489-1489/omgandroid D/test: returning directionPressed as -1
总是返回0.0,但我不知道为什么。
以下是我在getAxisValue(MotionEvent.AXIS_HAT_X/Y)
(MainActivity.java
内)中调用此函数的代码:
OnCreate
答案 0 :(得分:2)
如果您没有使用leanback并希望功能位于Activity
,那么您只需覆盖Activity
方法onKeyDown()
:
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
Log.d("debug", "we are here");
switch (keyCode) {
case KeyEvent.KEYCODE_DPAD_UP:
case KeyEvent.KEYCODE_DPAD_DOWN:
case KeyEvent.KEYCODE_DPAD_RIGHT:
case KeyEvent.KEYCODE_DPAD_LEFT:
case KeyEvent.KEYCODE_BACK:
case KeyEvent.KEYCODE_ESCAPE:
Log.d("OnKey", "key pressed!");
Toast.makeText(MainActivity.this, "key pressed!", Toast.LENGTH_SHORT).show();
return true;
}
return false;
}
然后使用如下所示的switch语句(在keyCode上)来触发您想要捕获的条件(case KeyEvent.KEYCODE_DPAD_UP
,case KeyEvent.KEYCODE_DPAD_DOWN
等)。
当您加入代码共享时,您还可以在视图上设置OnKeyListener
,但在这种情况下,您只需要覆盖Activity
方法。
如果您使用leanback(擅长列表管理和媒体播放):
Leanback,Google为了更轻松地编写Android TV应用程序而创建的库,它本身处理这个内容,因为它与内容列表和媒体播放相关。我建议查看我上面链接的示例项目。
如果您想自己实施点击处理,可以查看其源代码,并了解他们如何在PlaybackControlGlue
和PlaybackOverlayFragment
类中解决此问题。
Here他们处理onKey(...)
方法中的事件:
@Override
public boolean onKey(View v, int keyCode, KeyEvent event) {
switch (keyCode) {
case KeyEvent.KEYCODE_DPAD_UP:
case KeyEvent.KEYCODE_DPAD_DOWN:
case KeyEvent.KEYCODE_DPAD_RIGHT:
case KeyEvent.KEYCODE_DPAD_LEFT:
case KeyEvent.KEYCODE_BACK:
case KeyEvent.KEYCODE_ESCAPE:
以下dispatchAction(...)
方法中的其他一些事件:
boolean canPlay = keyEvent == null ||
keyEvent.getKeyCode() == KeyEvent.KEYCODE_MEDIA_PLAY_PAUSE ||
keyEvent.getKeyCode() == KeyEvent.KEYCODE_MEDIA_PLAY;
他们通过输入处理程序设置密钥处理程序:
private final PlaybackOverlayFragment.InputEventHandler mOnInputEventHandler =
new PlaybackOverlayFragment.InputEventHandler() {
@Override
public boolean handleInputEvent(InputEvent event) {
if (event instanceof KeyEvent) {
KeyEvent keyEvent = (KeyEvent) event;
return onKey(null, keyEvent.getKeyCode(), keyEvent);
}
return false;
}
};
通过以下方式设置:mFragment.setInputEventHandler(mOnInputEventHandler);
另一个很好的例子是PlaybackOverlayFragment
onInterceptInputEvent(...)
找到here的方法:
private boolean onInterceptInputEvent(InputEvent event) {
final boolean controlsHidden = areControlsHidden();
if (DEBUG) Log.v(TAG, "onInterceptInputEvent hidden " + controlsHidden + " " + event);
boolean consumeEvent = false;
int keyCode = KeyEvent.KEYCODE_UNKNOWN;
if (mInputEventHandler != null) {
consumeEvent = mInputEventHandler.handleInputEvent(event);
}
if (event instanceof KeyEvent) {
keyCode = ((KeyEvent) event).getKeyCode();
}
switch (keyCode) {
case KeyEvent.KEYCODE_DPAD_CENTER:
case KeyEvent.KEYCODE_DPAD_DOWN:
case KeyEvent.KEYCODE_DPAD_UP:
case KeyEvent.KEYCODE_DPAD_LEFT:
case KeyEvent.KEYCODE_DPAD_RIGHT:
他们通过以下方式附加拦截器:getVerticalGridView().setOnKeyInterceptListener(mOnKeyInterceptListener);
如果这可以解决您的问题,请告诉我。