[置顶] android按键功能的拓展

按键事件，大概由3部分，

1.底层调用input.h中的键值(如果新定义按键可以自行加入键值，反正在.kl文件做个映射就行)

2.一个映射到framework的映射文件在system/usr/keylayout/*.kl文件

3.具体按键功能的事件和功能拓展在frameworks/base/policy/src/com/android/internal/policy/impl/PhoneWindowManager.java

项目中的情况，正常情况下在线控耳机上MUSIC的情况下是MEDIA_NEXT(下一首)和MEDIA_PREVIOUS(上一首)，这个本身android是支持的，现在需要支持在电话状态下是音量加减的功能.

1.如果遇到硬件采集电压不稳，软件上的解决办法。底层按键驱动采集ADC电压不稳的解决办法，采集是使用定时器轮询的方式

解决办法：

a.加大定时器的采集密度，并做状态统计，在同一状态下采集5次，就上报按键//加大采集密度，必然导致消耗cpu，所以在没有按键事件的时候保持原来的采集密度，只有当满足按键条件的时候再加大采集频率

static void lradc1_data_function(unsigned long data)

{

volatile unsigned int reg_val;

static int key_pressed = -1, count = 0;

 int delay = HZ/40; //默认在为HZ/40采集，程序后面reg_val>0x34时，按键时为HZ/4,降低了采集频率，节省cpu资源，当有按键按下时采集HZ/40

+    if (reg_val >=0 && reg_val < 0x5 )+    {+            // hook key+            if (key_pressed == 0)      //按物理键是按了0，如果相等的话，就计数加一+                count++;+            else {+                key_pressed = 0;  //如果按物理键0，但不相等(为了防止误触的可能)强制赋值0 ，并且计数清0+                count = 0;+            }++            if (count > 5)+            {+                            sw_pressed[0] = 1;+                 input_report_key(sun4ikbd_dev, HOOK_KEY, 1);+                 input_sync(sun4ikbd_dev);+                 printk("[lkj] input key sw1 down \n");+                 count = 0;+            }++++    }+    else if( reg_val >= 0x6 && reg_val <= 0xb  )+    {+        // sw2+            if (key_pressed == 1)+                count++;+            else {+                key_pressed = 1;+                count = 0;+            }++            if (count > 5)+            {+                            sw_pressed[1] = 1;+                 input_report_key(sun4ikbd_dev, SW2_KEY, 1);+                 input_sync(sun4ikbd_dev);+                 printk("[lkj] input key sw2 down \n");+                 count = 0;+            }++    } else if ( reg_val >= 0xf && reg_val < 0x1f )+    {+        // sw3+             if (key_pressed == 2)+                count++;+            else {+                key_pressed = 2;+                count = 0;+            }++            if (count > 5)+            {+                            sw_pressed[2] = 1;+                 input_report_key(sun4ikbd_dev, SW3_KEY, 1);+                 input_sync(sun4ikbd_dev);+                 printk("[lkj] input key sw3 down \n");+                 count = 0;+            }++   }+    else if ( reg_val >= 0x34) {+        key_pressed = -1;+        count = 0;+               if (sw_pressed[0])+               {+                       sw_pressed[0] = 0;+                        input_report_key(sun4ikbd_dev, HOOK_KEY, 0);+                        input_sync(sun4ikbd_dev);+                        printk("[lkj] input key sw1 up \n");+               }+               if (sw_pressed[1])+               {+                       sw_pressed[1] = 0;+                        input_report_key(sun4ikbd_dev, SW2_KEY, 0);+                        input_sync(sun4ikbd_dev);+                        printk("[lkj] input key sw2 up \n");+               }+               if (sw_pressed[2])+               {+                       sw_pressed[2] = 0;+                        input_report_key(sun4ikbd_dev, SW3_KEY, 0);+                        input_sync(sun4ikbd_dev);+                        printk("[lkj] input key sw3 up \n");+               }+        delay = HZ/4;}

mod_timer(&mic_data->timer, jiffies + delay);

2.写个映射就可以

3.找到MEDIA_NEXT和MEDIA_PREVIOUS，区分2个状态，music和in_call，

diff --git a/policy/src/com/android/internal/policy/impl/PhoneWindowManager.java b/policy/src/com/android/internal/policy/impl/PhoneWindowManager.javaindex 8badbdd..1f4b785 100755--- a/policy/src/com/android/internal/policy/impl/PhoneWindowManager.java+++ b/policy/src/com/android/internal/policy/impl/PhoneWindowManager.java@@ -2982,11 +2982,32 @@ public class PhoneWindowManager implements WindowManagerPolicy {                         }                     }                 }+            case KeyEvent.KEYCODE_MEDIA_NEXT:+            case KeyEvent.KEYCODE_MEDIA_PREVIOUS:+               if (down) {+            AudioManager audioManager = (AudioManager) mContext.getSystemService(Context.AUDIO_SERVICE);//实例化这个audioManager，并用文件中的mContext++                       ITelephony telephonyService = getTelephonyService();+                       try {+                               if (telephonyService.isOffhook()) {+                                       Log.d(TAG, "++++++++---+++++telephonyService.isOffhook="+telephonyService.isOffhook());//isOffhook ==true 为通话状态下+                    audioManager.adjustSuggestedStreamVolume(+                            keyCode == KeyEvent.KEYCODE_MEDIA_NEXT ? AudioManager.ADJUST_RAISE : AudioManager.ADJUST_LOWER,+                            AudioManager.STREAM_RING,+                            AudioManager.FLAG_SHOW_UI);//调用AudioManager在in_call情况下调整音量并出现音量状态栏++                               break;+                               }//如果不在in_call状态下，就走下面源代码的线路+                       } catch (RemoteException ex) {+                            Log.w(TAG, "ITelephony threw RemoteException", ex);+                        }+               }             case KeyEvent.KEYCODE_HEADSETHOOK:             case KeyEvent.KEYCODE_MUTE:             case KeyEvent.KEYCODE_MEDIA_STOP:-            case KeyEvent.KEYCODE_MEDIA_NEXT:-            case KeyEvent.KEYCODE_MEDIA_PREVIOUS:             case KeyEvent.KEYCODE_MEDIA_REWIND:             case KeyEvent.KEYCODE_MEDIA_RECORD:             case KeyEvent.KEYCODE_MEDIA_FAST_FORWARD: {(END)

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