I am working with a Motorola Droid. I can see there is a side button which launches the camera.
In my app, I use a button which when pressed, allows the user to talk - like in a walkie-talkie i.e it is a push-to-talk button.
How do I use the side button to work like this button? i.e use it as a push-to-talk button.
Any help would be appreciated.
Thanks
Your activity can override onKeyDown() and watch for KEYCODE_CAMERA KeyEvents:
#Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode==KeyEvent.KEYCODE_CAMERA) {
// do something
return(true);
}
return(super.onKeyDown(keyCode, event));
}
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 5 EditTexts and I type in them using 5 buttons, so I don't need the keyboard.
How can I disable it completely, even when I click on the EditText? On EditText click I want only to focus it so that it has the cursor on. (I implemented everything so that when I click one of the 5 buttons, the focus goes on the next EditText).
The problem is that when I click on an EditText the keyboard pops up. I think I have to do it in java. Thank you!!!
MyEditor.setOnTouchListener(new OnTouchListener(){
#Override
public boolean onTouch(View v, MotionEvent event) {
int inType = MyEditor.getInputType(); // backup the input type
MyEditor.setInputType(InputType.TYPE_NULL); // disable soft input
MyEditor.onTouchEvent(event); // call native handler
MyEditor.setInputType(inType); // restore input type
return true; // consume touch event
}
});
Try :
editText.setShowSoftInputOnFocus(false);
editText.setInputType(InputType.TYPE_NULL);
editText.setFocusable(false);
Hi i have a push to talk application. My application does not continue to run when i press the power button and lock the screen. I am using wake lock with the flag PARTIAL_WAKE_LOCK. How can i provide my application to get voice messages when the user presses the power button.
You can get the event of keypress of Power button
#Override
public boolean dispatchKeyEvent(KeyEvent event)
{
if (event.getKeyCode() == KeyEvent.KEYCODE_POWER)
{
// Write your logic
return true;
}
return super.dispatchKeyEvent(event);
}
Hope this will help you..
I want to catch the press of any key of the softkeyboard. I don't want a EditView or TextView in my Activity, the event must be handled from a extended View inside my Activity.
I just tried this:
1) Override the onKeyUp(int keyCode, KeyEvent event) Activity method. This don't work with softkeyboard, it just catch few hardkeyboard.
2) Create my OnKeyListener and register that in my View that contains a registered and working OnTouchListener. This doesn't work at all with softkeyboard.
3) Override the onKeyUp(int keyCode, KeyEvent event) View method. This not work at all neither if I set my OnKeyListener nor if I don't set it.
4) With the InputMethodManager object Call the method showSoftInput and passing it my View. This don't work neither for raise up the keyboard, indeed i have to call toggleSoftInput; nor to catch the key events.
I tested all only in the emulator but i think it's enough. Why it's so complicate take a simple key event from a keyboard ?
For handling hardware keys and Back key you could use dispatchKeyEvent(KeyEvent event) in your Activity
#Override
public boolean dispatchKeyEvent(KeyEvent event) {
Log.i("key pressed", String.valueOf(event.getKeyCode()));
return super.dispatchKeyEvent(event);
}
UPD: unfortunately you can't handle soft keyboard events (see Handle single key events), unless you develop your own custom keyboard (follow the link to learn how Creating input method).
With the hint of vasart i can get the KeyPress event. To make the keycode printable i have used the function getUnicodeChar passing it the meta button state then just a char cast solve the problem.
This is the working code:
#Override
public boolean dispatchKeyEvent(KeyEvent KEvent)
{
int keyaction = KEvent.getAction();
if(keyaction == KeyEvent.ACTION_DOWN)
{
int keycode = KEvent.getKeyCode();
int keyunicode = KEvent.getUnicodeChar(KEvent.getMetaState() );
char character = (char) keyunicode;
System.out.println("DEBUG MESSAGE KEY=" + character + " KEYCODE=" + keycode);
}
return super.dispatchKeyEvent(KEvent);
}
Of course this work only with ASCII character.
There are no option to handling key press events on soft keyboard (an on-screen keyboard) only from a hardware keyboard.
for more details: Handling Keyboard Actions
Note: When handling keyboard events with the KeyEvent class and
related APIs, you should expect that such keyboard events come only
from a hardware keyboard. You should never rely on receiving key
events for any key on a soft input method (an on-screen keyboard).
When Keyboard is opened in activity your activity actually becomes foreground...
All TextArea or TextFields have their own mechanism to get keypressed from onScreen keyboard...
if you want to use onKeyDown() listner for virtual keyboard make sure that you set in AndroidManifest File under your activity android:windowSoftInputMode="stateAlwaysVisible" then onkeyDown() will work it did worked for me ...
My app has three activities, A, B and C. I am moving from A to B through an OK button, and I want to move back from B to A by using the default back button of Android devices. When I press the button, though, the entire app gets closed. How can I get around this problem?
I suspect you call finish() in your OK button onclick listener. Don't do that. finish() removes your activity from activity stack.
Read more here.
why start your activity for result ? when you press the backbutton, the result is set to RESULT_CANCELED form the B activity, so it crashes if you don't handle the resultcode...
you can handle the backpress like this
private static final int NONE = -1;
#Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK) {
setResult(NONE, intent);
finish();
return super.onKeyDown(keyCode, event);
}
When you are Ok button r u starting an intent...like
Intent int=new intent(context,B.class);
startActivity(int);
then if you are not handling backbutton.
If use default back button...it will goes back to A.
Hope it helps...
In my onClick method (in Main Activity) I use the code:
Intent intent = new Intent(context, SecondActivity.class);
context.startActivityForResult(intent, SecondActivity.SECONDACTIVITY_REQUEST);
In the manifest I've got:
<activity android:name=".SecondActivity" android:screenOrientation="landscape" android:launchMode="standard"></activity>
This works for me without any other settings that I can see. What events are you responding to?
Note that you can also go back an activity, in code like this:
super.setResult(Activity.RESULT_OK);
super.finish();
Edit...
Make sure you're not swallowing the event in the Main Activitys onKeyDown event.
#Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
//your code here
//if (keyCode ==
//...
//else
return super.onKeyDown(keyCode, event);
}