自定义外部按键（硬件），实现android对按键事件的响应实现流程：
1、内核层：
将按键驱动做好，并参考include/linux/input.h
#define KEY_F20 190
#define KEY_F21 191
#define KEY_F22 192
#define KEY_F23 193
#define KEY_F24 194
修改 arch/arm/mach-s3c64xx/mach-mini6410.c
static struct gpio_keys_button gpio_buttons[] = {
……………
{
.gpio = S3C64XX_GPL(12),
.code = 190,
.desc = " FUNCTION_F1",
.active_low = 1,
.wakeup = 0,
}, {
.gpio = S3C64XX_GPN(3),
.code = 191,
.desc = " FUNCTION_F2",
.active_low = 1,
.wakeup = 0,
}, {
.gpio = S3C64XX_GPN(4),
.code = 192,
.desc = " FUNCTION_F3",
.active_low = 1,
.wakeup = 0,
}, {
.gpio = S3C64XX_GPN(5),
.code = 193,
.desc = " FUNCTION_F4",
.active_low = 1,
.wakeup = 0,
}, {
.gpio = S3C64XX_GPN(2),
.code = 194,
.desc = " FUNCTION_F5",
.active_low = 1,
.wakeup = 0,
}
};
2、android文件系统层
1）、/frameworks/base/include/ui/keycodeLabels.h
在数组static const KeycodeLabel KEYCODES[]
中添加新定义的信息
{ "FUNCTION_F1", 111 },
{ "FUNCTION_F2", 112 },
{ "FUNCTION_F3", 113 },
{ "FUNCTION_F4", 114 },
{ "FUNCTION_F5", 115 },
2）、 ./ frameworks/base/native/include/android/Keycodes.h
枚举类型中添加
AKEYCODE_FUNCTION_F1 = 111,
AKEYCODE_FUNCTION_F2 = 112,
AKEYCODE_FUNCTION_F3 = 113,
AKEYCODE_FUNCTION_F4 = 114,
AKEYCODE_FUNCTION_F5 = 115,
3）、 ./frameworks/base/core/res/res/values/attrs.xml
<enum name="KEYCODE_FUNCTION_F1" value="111" />
<enum name="KEYCODE_FUNCTION_F2" value="112" />
<enum name="KEYCODE_FUNCTION_F3" value="113" />
<enum name="KEYCODE_FUNCTION_F4" value="114" />
<enum name="KEYCODE_FUNCTION_F5" value="115" />
4）、 ./frameworks/base/core/java/android/view/KeyEvent.java
public static final int KEYCODE_FUNCTION_F1 = 111;
public static final int KEYCODE_FUNCTION_F2 = 112;
public static final int KEYCODE_FUNCTION_F3 = 113;
public static final int KEYCODE_FUNCTION_F4 = 114;
public static final int KEYCODE_FUNCTION_F5 = 115;
并修改
private static final int LAST_KEYCODE = KEYCODE_FUNCTION_F5;
5）、 ./frameworks/base/libs/ui/Input.java
在bool KeyEvent::isSystemKey(int32_t keyCode)（）中，同样需要添加：
case AKEYCODE_FUNCTION_F1:
case AKEYCODE_FUNCTION_F2:
case AKEYCODE_FUNCTION_F3:
case AKEYCODE_FUNCTION_F4:
case AKEYCODE_FUNCTION_F5:
6）、通过以上的更改，新的键值就添加上去了，注意上面标红色的数字表示必须相同的，另外由于更改了 KeyEvent，影响到了API，所以需要make
update-api
7）、修改system/usr/keylayout/的qwerty.kl文件
key 194 FUNCTION_F5 WAKE_DROPPED
key 193 FUNCTION_F4 WAKE_DROPPED
key 192 FUNCTION_F3 WAKE_DROPPED
key 190 FUNCTION_F1 WAKE_DROPPED
key 191 FUNCTION_F2 WAKE_DROPPED
7）、应用程序以两种方式响应：
a: 应用程序的View或者Activity通过调用onKeyDown()或onKeyUp()直接监听按键消息。
public boolean onKeyDown(int kCode,KeyEvent kEvent)
{
switch(kCode)
{
case KeyEvent. FUNCTION_F1:
Log.v("MyKeyDown","onkeydown= FUNCTION_F1");
break;
…………..
}
}
b：在系统中对新键值做特殊处理
如果对新键值进行处理，可以通过获取相应的keycode，对它进行处理；对于按键事件的处理一般如下文件中：./frameworks/base/policy/src/com/android/internal/policy/impl/PhoneWindowManager.java
的函数
public boolean interceptKeyBeforeDispatching(WindowState win, int action, int flags,
int keyCode, int metaState, int repeatCount, int policyFlags) {
……………………………….
// added by joqian 20121026 start
if ((keyCode == KeyEvent.KEYCODE_FUNCTION_F1) && !down)
{
String actionString = "com.axent.succi.controller.keycode_function1";
Intent intent = new Intent(actionString);
mContext.sendBroadcast(intent);
Log.i(TAG, "interceptKeyBeforeDispatching function KEYCODE_FUNCTION_F1 by joqian\n");
}
if ((keyCode == KeyEvent.KEYCODE_FUNCTION_F2) && !down)
{
String actionString = "com.axent.succi.controller.keycode_function2";
Intent intent = new Intent(actionString);
mContext.sendBroadcast(intent);
Log.i(TAG, "interceptKeyBeforeDispatching function KEYCODE_FUNCTION_F2 by joqian\n");
}
if ((keyCode == KeyEvent.KEYCODE_FUNCTION_F3) && !down)
{
String actionString = "com.axent.succi.controller.keycode_function3";
Intent intent = new Intent(actionString);
mContext.sendBroadcast(intent);
Log.i(TAG, "interceptKeyBeforeDispatching function KEYCODE_FUNCTION_F3 by joqian\n");
}
if ((keyCode == KeyEvent.KEYCODE_FUNCTION_F4) && !down)
{
String actionString = "com.axent.succi.controller.keycode_function4";
Intent intent = new Intent(actionString);
mContext.sendBroadcast(intent);
Log.i(TAG, "interceptKeyBeforeDispatching function KEYCODE_FUNCTION_F4 by joqian\n");
}
// added by joqian 20121026 end
…………………………………
}
3、应用程序层：
1）、首先建立一个应用程序，并且建立一个类
package com.axent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.util.Log;
public class myBroadCast extends BroadcastReceiver
{
public myBroadCast()
{
Log.v("myBroadCast","myBroadCast");
}
@Override
public void onReceive(Context context, Intent intent)
{
Log.v("myBroadCast", "onReceive");
}
}
2）、并且修改AndroidManifest.xml，添加红色代码部分：
<application android:label="@string/app_name"
android:icon="@drawable/ic_launcher"
android:theme="@style/AppTheme">
<receiver android:name=".myBroadCast">
<intent-filter>
<action android:name="com.axent.succi.controller.keycode_function1"/>
<action android:name="com.axent.succi.controller.keycode_function2"/>
<action android:name="com.axent.succi.controller.keycode_function3"/>
<action android:name="com.axent.succi.controller.keycode_function4"/>
</intent-filter>
</receiver>
</application>
参考：
Linux驱动和android文件系统的修改方法参考：http://blog.csdn.net/acm2008/article/details/7065546
http://blog.csdn.net/acm2008/article/details/7065546
应用程序的编写方法参考：http://www.cnblogs.com/TerryBlog/archive/2010/08/16/1801016.html