实体物理音量键替换为home键

127|YT_r:/ # getevent -l
add device 1: /dev/input/event1
  name:     "goodix-ts"
add device 2: /dev/input/event2
  name:     "adc-keys"
add device 3: /dev/input/event0
  name:     "rk805 pwrkey"
/dev/input/event2: EV_KEY       KEY_VOLUMEUP         DOWN
/dev/input/event2: EV_SYN       SYN_REPORT           00000000
/dev/input/event2: EV_KEY       KEY_VOLUMEUP         UP
/dev/input/event2: EV_SYN       SYN_REPORT           00000000

实践：
--- a/frameworks/base/services/core/java/com/android/server/policy/PhoneWindowManager.java
+++ b/frameworks/base/services/core/java/com/android/server/policy/PhoneWindowManager.java
@@ -2732,7 +2732,15 @@ public class PhoneWindowManager implements WindowManagerPolicy {

	@Override
    public long interceptKeyBeforeDispatching(IBinder focusedToken, KeyEvent event,
            int policyFlags) {
            ...
             Log.d(TAG, "interceptKeyTi keyCode=" + keyCode + " down=" + down + " repeatCount="
                     + repeatCount + " keyguardOn=" + keyguardOn + " canceled=" + canceled);
         }
-
+        Log.d("tag","policyFlags:"+policyFlags);//长按也会产生不同的policyFlags 
+        if(keyCode == KeyEvent.KEYCODE_VOLUME_UP && policyFlags == 1644167168){
+		//mContext.startActivity(new Intent(android.provider.Settings.ACTION_SETTINGS))//进入Settings app
+            DisplayHomeButtonHandler handler = mDisplayHomeButtonHandlers.get(displayId);
+            if (handler == null) {
+                handler = new DisplayHomeButtonHandler(displayId);
+                mDisplayHomeButtonHandlers.put(displayId, handler);
+            }
+            return handler.handleHomeButton(focusedToken, event);
+        }
         //infrare simulate mouse
         boolean isBox = "box".equals(SystemProperties.get("ro.target.product"));
         if(isBox){
		...
		
demo:
1.先获取按键对应的key

2.找到系统对应的  .kl 文件，修改按键的映射

3.在/frameworks/base/services/core/java/com/android/server/policy/PhoneWindowManager.java 的

interceptKeyBeforeQueueing(KeyEvent event, int policyFlags)方法中做按键对应的逻辑。
原文链接：https://blog.csdn.net/qq_35611559/article/details/79915034