How to map another keycode for back navigation in AOSP 13?

Question

I am using AOSP 13 source code.

• To do back via adb shell

---

adb shell input keyevent 4

4 is key code for back

I want to map back navigation via key code 141, so that i can use above command for back as

adb shell input keyevent 141

Is that possible ?

Answer 1

I have found a solution.

• As the keycode 141 is mapped to KEYCODE_F11 in frameworks/base/core/java/android/view/KeyEvent.java

• Need to handle input event for KEYCODE_F11 in frameworks/base/services/core/java/com/android/server/policy/PhoneWindowManager.java

• Import files

import android.content.Context;
import android.os.SystemClock;
import android.view.InputEvent;
import android.view.KeyEvent;
import com.android.server.LocalServices;
import com.android.server.input.InputManagerService;
import android.hardware.input.InputManager;

• In function interceptKeyBeforeQueueing() there is a swhitch case added the case for KEYCODE_F11 in it.

// Handle special keys.
         switch (keyCode) {
+           case KeyEvent.KEYCODE_F11:
+               long now = SystemClock.uptimeMillis();
+               if (down)
+               {
+                       // Inject a key down event
+                       KeyEvent downEvent = new KeyEvent(now, now, KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_BACK, 0);
+                       InputManager.getInstance().injectInputEvent(downEvent, InputManager.INJECT_INPUT_EVENT_MODE_WAIT_FOR_FINISH);
+               }
+               else
+               {
+                       // inject a key up event
+                       KeyEvent upEvent = new KeyEvent(now, now, KeyEvent.ACTION_UP, KeyEvent.KEYCODE_BACK, 0);
+                       InputManager.getInstance().injectInputEvent(upEvent, InputManager.INJECT_INPUT_EVENT_MODE_WAIT_FOR_FINISH);
+               }
+               break;
             case KeyEvent.KEYCODE_BACK: {
                 if (down) {
                     mBackKeyHandled = false;