Android4.0 add a new Android key value

The new key value is added here, not a key value created without credentials, but based on the key values detected in the kernel and then converted to the desired value for Android:

To add a Linux key value of 217, map it to Android's key value browser (which does not exist before this key value) as an example:

1, Android does not have this key value, need to define

/frameworks/base/core/java/android/view/keyevent.java

Define this new key value

public static final int keycode_browser = 210;

We will then see the following comments:

Note:if you add a new keycode This must also add it to:

IsSystem ()

Native/include/android/keycodes.h

Frameworks/base/include/ui/keycodelabels.h

External/webkit/webkit/android/plugins/anpkeycodes.h

Frameworks/base/core/res/res/values/attrs.xml

Emulator?

Last_keycode

Keycode_symbolic_names

//

Also Android currently does not reserve code ranges for vendor-

Specific key codes. If you have a new key codes to the, you

must contribute a patch to the open source project to define

Those new codes. This was intended to maintain a consistent

Set of key code definitions across all Android devices.

The above comment has shown us the steps required to add a key value:

2,/frameworks/base/core/java/android/view/keyevent.java

Public Final Boolean IsSystem () {

Return Native_issystemkey (Mkeycode);

}

/frameworks/base/jni/android_view_keyevent.java

Static Jboolean Native_issystemkey (jnienv* env, Jobject clazz, Jint keycode) {

Return Keyevent::issystemkey (KeyCode);

}

/frameworks/base/libs/ui/input.cpp

BOOL Keyevent::issystemkey (int32_t keycode) {

Switch (keycode) {

......

Case Akeycode_browser:

return true;

}

}

3, Native/include/android/keycodes.h

/*

* Key codes.

*/

enum {

......

Akeycode_calculator = 210,

Akeycode_browser = 211,

}

4, Frameworks/base/include/ui/keycodelabels.h

What is defined here is actually the name of the Linux key and the Android key value in the KL file, which is a mapping table of Linux key to Android key;

such as ATC260X-IRKEYPAD.KL:

......

Key 217 BROWSER//Here BROWSER is the character form of our defined Android key value, 217 is the Linux key value

Well, browser can not be used for no reason, there must be a defined position, this position is KeycodeLabels.h

static const Keycodelabel keycodes[] = {

......

{"CALCULATOR", 210},

{"BROWSER", 211},//The BROWSER here is what we use above, and 211 is the Android key value

{NULL, 0}

}

Load and parse this MAP:ATC260X-IRKEYPAD.KL in EventHub.cpp, then get the Linux key value 217 is a string of key, this string is browser, with the above keycodes array, you can get its corresponding Android The OID key value.

5, External/webkit/webkit/android/plugins/anpkeycodes.h

Enum Anpkeycodes {

......

Kappswitch_anpkeycode = 186,

Kbrowser_anpkeycode = 211,

};

6, Frameworks/base/core/res/res/values/attrs.xml

<attr name= "KeyCode" >

<enum name= "Keycode_calculator" value= "/>"

<enum name= "Keycode_browser" value= "211"/>

</attr>

7,/frameworks/base/core/java/android/view/keyevent.java

Last_keycode is the last keycode, because a new one is added, so you need to change the value of this

Last_keycode = Keycode_browser

private static final

sparsearray<string> keycode_symbolic_names = new sparsearray<string> ();

private static void Populatekeycodesymbolicnames () {

......

Names.append (Keycode_music, "keycode_music");

Names.append (Keycode_calculator, "keycode_calculator");

Names.append (Keycode_browser, "Keycode_browser");

}

After these operations are completed, the key-value mappings for Linux keys to Android are completed. That is, there is one more keycode_browser in Android. Its value is 211.

Android4.0 add a new Android key value