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Use device id 0 for touch/mouse events

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Virtual device is only for keyboard sources, not mouse or touchscreen
sources. Here is the value of InputDevice.getDevice(-1).toString():

    Input Device -1: Virtual
      Descriptor: ...
      Generation: 2
      Location: built-in
      Keyboard Type: alphabetic
      Has Vibrator: false
      Has mic: false
      Sources: 0x301 ( keyboard dpad )

InputDevice.getDeviceId() documentation says:

> An id of zero indicates that the event didn't come from a physical
> device and maps to the default keymap.

<https://developer.android.com/reference/android/view/InputEvent#getDeviceId()>

However, injecting events with a device id of 0 causes event.getDevice()
to be null on the client-side.

Commit 26529d377f used -1 as a workaround
to avoid a NPE on a specific Android TV device. But this is a bug in the
device system, which wrongly assumes that input device may not be null.

A similar issue was present in Flutter, but it is now fixed:
 - <https://github.com/flutter/flutter/issues/30665>
 - <https://github.com/flutter/engine/pull/7986>

On the other hand, using an id of -1 for touchscreen events (which is
invalid) causes issues for some apps:
<https://github.com/Genymobile/scrcpy/issues/2125#issuecomment-790535792>

Therefore, use a device id of 0.

An alternative could be to find an existing device matching the source,
like "adb shell input" does. See getInputDeviceId():
<https://android.googlesource.com/platform/frameworks/base.git/+/master/cmds/input/src/com/android/commands/input/Input.java>

But it seems better to indicate that the event didn't come from a
physical device, and it would not solve #962 anyway, because an Android
TV has no touchscreen.

Refs #962 <https://github.com/Genymobile/scrcpy/issues/962>
Fixes #2125 <https://github.com/Genymobile/scrcpy/issues/2125>
This commit is contained in:
Romain Vimont 2021-03-14 18:03:42 +01:00
parent 429fdef04f
commit 40febf4a91
1 changed files with 3 additions and 3 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

6
server/src/main/java/com/genymobile/scrcpy/Controller.java
View file

@ -14,7 +14,7 @@ import java.util.concurrent.TimeUnit;
public class Controller {
private static final int DEVICE_ID_VIRTUAL = -1;
private static final int DEFAULT_DEVICE_ID = 0;
private static final ScheduledExecutorService EXECUTOR = Executors.newSingleThreadScheduledExecutor();
@ -210,7 +210,7 @@ public class Controller {
int source = nonPrimaryButtonPressed ? InputDevice.SOURCE_MOUSE : InputDevice.SOURCE_TOUCHSCREEN;
MotionEvent event = MotionEvent
.obtain(lastTouchDown, now, action, pointerCount, pointerProperties, pointerCoords, 0, buttons, 1f, 1f, DEVICE_ID_VIRTUAL, 0, source,
.obtain(lastTouchDown, now, action, pointerCount, pointerProperties, pointerCoords, 0, buttons, 1f, 1f, DEFAULT_DEVICE_ID, 0, source,
0);
return device.injectEvent(event);
}
@ -233,7 +233,7 @@ public class Controller {
coords.setAxisValue(MotionEvent.AXIS_VSCROLL, vScroll);
MotionEvent event = MotionEvent
.obtain(lastTouchDown, now, MotionEvent.ACTION_SCROLL, 1, pointerProperties, pointerCoords, 0, 0, 1f, 1f, DEVICE_ID_VIRTUAL, 0,
.obtain(lastTouchDown, now, MotionEvent.ACTION_SCROLL, 1, pointerProperties, pointerCoords, 0, 0, 1f, 1f, DEFAULT_DEVICE_ID, 0,
InputDevice.SOURCE_TOUCHSCREEN, 0);
return device.injectEvent(event);
}