I have this event handler in my activity:
#Override
public boolean onKeyUp(int keyCode, KeyEvent event) {
switch (keyCode) {
case KeyEvent.KEYCODE_MEDIA_FAST_FORWARD:
//do something
return true;
case KeyEvent.KEYCODE_MEDIA_REWIND:
//do something
return true;
default:
return super.onKeyUp(keyCode, event);
}
}
While debugging in Android TV device emulator, I can see KEYCODE_DPAD_LEFT and KEYCODE_MEDIA_PLAY_PAUSE when I press a button in directional pad extended control.
But when I press "fast forward" or "rewind" media keys, the key up event is triggered, but the key code is "unrecognized".
KeyEvent { action=ACTION_UP, keyCode=KEYCODE_UNKNOWN, scanCode=208...
Is this a Google bug or am I doing something wrong here?
It seems that the TV Emulator actually does not provide the correct keycode here, which seems to be a bug.
You can simulate this via the command line:
adb shell input dpad keyevent 90
This will trigger the KEYCODE_MEDIA_FAST_FORWARD button.
Related
I'm a french developer , i'm creating an android tv application about cloud Gaming in a webview with java.
My application start a gaming stream direcly in the webview, on fullscreen, the physical buttons of controlers are working with the game, eccept the "view button" the "back button'.
This "view button" or if your prefer "select button" is for android tv a back button to the homescreen. So i have to overiding this back button, and i want replace it by a "select button" that it can interact with the games for displaying maps and inventory like in rpg games.
I know that the name will be "button_select" for interact with the pc game. So in android tv for now i will always redirected to the home page.
this is a sample of my code.
public class MainActivity extends AppCompatActivity {
#Override
public void onBackPressed() {
return;
}
With this overide, the back button is completly disabled for now, i want replace it or call the "button_select". I readed something about "handler" perhaps this is the solution.
Edit 16/06/2021
I tested much coded, but nothing work.
this one
#Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if(keyCode == KeyEvent.KEYCODE_BACK){
keyCode = KeyEvent.KEYCODE_BUTTON_SELECT;
}
return super.onKeyDown(keyCode, event);
}
And its variants
#Override
public boolean dispatchKeyEvent(KeyEvent event) {
int action = event.getAction();
int keyCode = event.getKeyCode();
switch (keyCode) {
case KeyEvent.KEYCODE_BACK:
if (action == KeyEvent.ACTION_DOWN ){
//Do something in the back button
keyCode = KeyEvent.KEYCODE_BUTTON_SELECT;
}
return true;
default:
return super.dispatchKeyEvent(event);
}
}
In game, the back button is disabled but, the" keycode_button_select "not interact with the game. There is nothing. I test with the "keycode button_start" the same things.
I tested the app button mapper for android tv, there is an option for custom keycodes with adb, and nothing is working in game.
https://play.google.com/store/apps/details?id=flar2.homebutton&hl=fr&gl=US
So by the code or by an app, nothing is working for now, i don't want to forcing the "root mode" for this things. Perhaps i'll just have to implementing a gamepad Plugin in java. I don't know...
Edit 18/06/21
I can capture the "back button" and display a dialog alert that appear on middle of the screen. But the actions after has no effect for now. I tested "dispatchEvent" with no success for now. I will testing the functions "robots". Perhaps "robot" and "dispatchEvent" will working together.
Thank you for your help.
I am assuming that you want to call button_select key when user presses back button.
In this case, create a method to call upon pressing back button. And call that method from the onBackPressed method.
For example:
public void callButtonSelectKey() {
//This could be done in either ways.
//1.
val i = Instrumentation()
i.sendKeyDownUpSync(KeyEvent.KEYCODE_BUTTON_SELECT)
//2.
val keyEventDown = KeyEvent(KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_BUTTON_SELECT)
val keyEventUp = KeyEvent(KeyEvent.ACTION_UP, KeyEvent.KEYCODE_BUTTON_SELECT)
dispatchKeyEvent(keyEventDown)
dispatchKeyEvent(keyEventUp)
}
#Override
public void onBackPressed() {
methodToCallUponBackPress();
return;
}
Now when the user presses the back button, it will call callButtonSelectKey method invoke "button_select" key. (i.e. remapped backbutton to button_select)
Let me know if you have any more questions.
EDIT
In an Object Oriented Language, overriding the class's (in this case KeyEvent) field (in this case, keycode) will do nothing. Like the code below:
//Do something in the back button
keyCode = KeyEvent.KEYCODE_BUTTON_SELECT;
To call button_select when you receive the event of KEYCODE_BACK, you should manually invoke the method to call Key Event, in this case the method I gave you earlier dispatchKeyEvent .
So you should make your change into something like this:
#Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if(keyCode == KeyEvent.KEYCODE_BACK){
//This could be done in either ways.
//1.
val i = Instrumentation()
i.sendKeyDownUpSync(KeyEvent.KEYCODE_BUTTON_SELECT)
//2.
val keyEventDown = KeyEvent(KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_BUTTON_SELECT)
val keyEventUp = KeyEvent(KeyEvent.ACTION_UP, KeyEvent.KEYCODE_BUTTON_SELECT)
dispatchKeyEvent(keyEventDown)
dispatchKeyEvent(keyEventUp)
}
return super.onKeyDown(keyCode, event); //Edit this return statement if you want to ignore a keypress.
}
I have attached a physical keyboard to an Android tablet using USB. How can I call a function or perform some action in an Android app on pressing a paticular key, for example when pressing the zero key?
How could I implement the below code (for the zero key)?
#Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
switch (keyCode) {
case KeyEvent.KEYCODE_A:
{
// your Action code
return true;
}
}
return super.onKeyDown(keyCode, event);
}
It was such a silly mistake i didnt import Keyevent ..
I have a custom device with a custom button and I need to handle an hardware Button Events/Intents:
every time I press the button it generates a PTT Press Action and I need to open my custom application, is there a way to do this?
If by custom device, you mean custom AOSP. Then make sure, it's button bound to events, this should be done with low level device driver configuration. And it's complicated work. Next, make sure you receive your click in next events.
Try to either use dispatch key event on Activity work:
#Override
public boolean dispatchKeyEvent(KeyEvent event) {
if (event.getKeyCode() == KeyEvent.KEYCODE_ENTER) {
if (event.getAction() == KeyEvent.ACTION_UP){
enter();
return true;
}}
return super.dispatchKeyEvent(event);
};
On on key event with Android View which is in focus.
public boolean onKey(View v, int keyCode, KeyEvent event) {
switch (keyCode) {
case KeyEvent.KEYCODE_ENTER:
/* This is a sample for handling the Enter button */
return true;
}
return false;
}
This is my code when I press the volume up button to next / prev songs :
#Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if ((keyCode == KeyEvent.KEYCODE_VOLUME_DOWN) {
prevSongs();
return true;
} else if ((keyCode == KeyEvent.KEYCODE_VOLUME_UP)) {
nextSongs();
return true;
} else return super.onKeyDown(keyCode, event);
}
But when the application exits (with the home button to return to the home screen) and I press the volume up button again, it does not work.
How does it work whether it's in or out of the app?
Thank !
You need to create a service to handle your playing media. When you exit the app, you can't listen to volume events, but in service you can do it. Also, listening to volume keys to change songs is a bad idea. You should use a notification with actions (buttons).
I want to stop media sound when the user press hold key or power key
I do this
public boolean onKeyDown(int keyCode, KeyEvent event) {
if(keyCode == KeyEvent.KEYCODE_ENDCALL || keyCode == KeyEvent.KEYCODE_POWER){
pauseSound();
}
return super.onKeyDown(keyCode, event);
}
But this override function didn't invoke when Power or end call is pressed
Any idea?
Thanks it solved, Ovveride EndCall & Power is forbidden for security reasons, I overrided "OnPause" (of activity) and it works good, Thanks again