Android框架层添加新KeyEvent事件

Android原生的KeyEvent事件有200多个,但是如果随便使用这些事件,上层的处理逻辑就会出问题,比如丢事件或者逻辑混乱,那么如何添加一套自己的KeyEvent事件呢?

待我娓娓道来:

这次添加的是一个需要底层input设备上报的双击事件。

先从framework说起:

--- a/frameworks/base/api/current.txt
+++ b/frameworks/base/api/current.txt
@@ -26771,6 +26771,7 @@ package android.view {
field public static final int KEYCODE_CTRL_LEFT = 113; // 0x71
field public static final int KEYCODE_CTRL_RIGHT = 114; // 0x72
field public static final int KEYCODE_D = 32; // 0x20
+ field public static final int KEYCODE_DCLICK = 752; // 0x2f0
field public static final int KEYCODE_DEL = 67; // 0x43
field public static final int KEYCODE_DPAD_CENTER = 23; // 0x17
field public static final int KEYCODE_DPAD_DOWN = 20; // 0x14

这一步是修改系统API文件,跟执行make update-api 一个结果,但是我习惯自己编辑修改此文件。


第二步:

--- a/frameworks/base/core/java/android/view/KeyEvent.java
+++ b/frameworks/base/core/java/android/view/KeyEvent.java
@@ -664,9 +664,11 @@ public class KeyEvent extends InputEvent implements Parcelable {
* @hide
*/
public static final int KEYCODE_GALLERY = 228;
+
+ public static final int KEYCODE_DCLICK = 752;

- private static final int LAST_KEYCODE = KEYCODE_GALLERY;
+ private static final int LAST_KEYCODE = KEYCODE_DCLICK;

// NOTE: If you add a new keycode here you must also add it to:
// isSystem()
@@ -917,6 +919,7 @@ public class KeyEvent extends InputEvent implements Parcelable {
names.append(KEYCODE_IME_TOGGLE, "KEYCODE_IME_TOGGLE");
names.append(KEYCODE_MESSAGING, "KEYCODE_MESSAGING");
names.append(KEYCODE_GALLERY, "KEYCODE_GALLERY");
+ names.append(KEYCODE_DCLICK, "KEYCODE_DCLICK");
};
KeyEvent类中添加事件。


第三步:

--- a/frameworks/base/core/res/res/values/attrs.xml
+++ b/frameworks/base/core/res/res/values/attrs.xml
@@ -1567,6 +1567,7 @@



+

系统属性源xml文件添加键值value。


第四步:

--- a/frameworks/base/policy/src/com/android/internal/policy/impl/PhoneWindowManager.java
+++ b/frameworks/base/policy/src/com/android/internal/policy/impl/PhoneWindowManager.java
@@ -4547,6 +4547,7 @@ public class PhoneWindowManager implements WindowManagerPolicy {
}
}
case KeyEvent.KEYCODE_HEADSETHOOK:
+ case KeyEvent.KEYCODE_DCLICK:
case KeyEvent.KEYCODE_MUTE:
case KeyEvent.KEYCODE_MEDIA_STOP:
case KeyEvent.KEYCODE_MEDIA_NEXT:

修改WindowManager类,此处的目的是将该事件以MEDIA_BUTTON事件的形式广播给app端。


第五步:

--- a/frameworks/native/include/android/keycodes.h
+++ b/frameworks/native/include/android/keycodes.h
@@ -273,6 +273,7 @@ enum {
AKEYCODE_IME_TOGGLE = 226,
AKEYCODE_MESSAGING = 227,
AKEYCODE_GALLERY = 228,
+ AKEYCODE_DCLICK = 752,
/// @}
添加至native层的头文件。


第六步:

--- a/frameworks/native/libs/input/Input.cpp
+++ b/frameworks/native/libs/input/Input.cpp
@@ -71,6 +71,7 @@ bool KeyEvent::hasDefaultAction(int32_t keyCode) {
case AKEYCODE_BRIGHTNESS_DOWN:
case AKEYCODE_BRIGHTNESS_UP:
case AKEYCODE_MEDIA_AUDIO_TRACK:
+ case AKEYCODE_DCLICK:
return true;
}

@@ -117,6 +118,7 @@ bool KeyEvent::isSystemKey(int32_t keyCode) {
case AKEYCODE_IME_TOGGLE:
case AKEYCODE_MESSAGING:
case AKEYCODE_GALLERY:
+ case AKEYCODE_DCLICK:
/// @}
return true;
}
将该事件添加至系统按键中。


第七步:就是修改内核层面的input头文件等,或者说直接report相应的键值即可。



需要此功能添加的,可以效法添加,看下效果。。。























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