android按键静音键功能实现

实现P931项目蓝牙键盘静音键功能以及打印F1，F2键信息打印

准备工作：

1.下载android4.0.3系统

git clone gitolite@scm:vc0882/sdk_4.0

（使用git pull可以更新本地文件）

2.修改代码

修改思路：Android已经定义了比较丰富、完整的标准按键。在一般情况下，不需要为Android系统增加按键，只需要根据kl配置按键即可。在系统中有比较奇特按键的时候，需要更改Android系统的框架层来更改按键。

底层驱动已经实现相应按键驱动。

1>.kernel/include/linux/input.h

察看F1，F2，MUTE按键映射到Linux的值

#define KEY_MUTE113

#define KEY_F1 59
#define KEY_F2 60

#define KEY_BRIGHTNESSDOWN 224
#define KEY_BRIGHTNESSUP 225

 

2>.frameworks/base/data/keyboards/qwerty.kl

将1中查到的的值添加到配置文件qwerty.kl中，以便映射到上层应用

add by huanggenda
key 60 F2
key 61 F3
key 113 MUTE
key 0x1d0 FN
key 224 BRIGHTNESSDOWN 
key 225 BRIGHTNESSUP 
#the end by huanggenda

3>.framework/core/res/res/values/attrs.xml 

此文件为linux映射到应用的值，以供应用程序调用

<enum name="KEYCODE_F1" value="131" />
<enum name="KEYCODE_F2" value="132" />

<enum name="KEYCODE_VOLUME_MUTE" value="164" />

<!--add by huanggenda-->
<enum name="KEY_BRIGHTNESSDOWN" value="211" />
<enum name="KEY_BRIGHTNESSUP" value="212" />
<!--the end add by huanggenda-->

4>.在framework/base/policy/src/com/android/impl/PhoneWindowManager.java

按键code察看调试：

//modify false to true for debug
if (true) {
Log.d(TAG, "interceptKeyTi keyCode=" + keyCode + " down=" + down + " repeatCount="
+ repeatCount + " keyguardOn=" + keyguardOn + " mHomePressed=" + mHomePressed);
}

//The function of F2 and F1 add by huanggenda
if(keyCode == KeyEvent.KEYCODE_F2)
Log.d(TAG, "interceptKeyTi keyCode=" + keyCode + " F2");
if(keyCode == KeyEvent.KEYCODE_F3)
Log.d(TAG, "interceptKeyTi keyCode=" + keyCode +" F3");
if(keyCode == KeyEvent.KEYCODE_BRIGHTNESSDOWN)
Log.d(TAG, "interceptKeyTi keyCode=" + keyCode + " BRIGHTNESSDOWN");
if(keyCode == KeyEvent.KEYCODE_BRIGHTNESSUP)
Log.d(TAG, "interceptKeyTi keyCode=" + keyCode +" BRIGHTNESSUP");
//The end by huanggenda

5>.framework/base/media/java/android/media/AudioManager.java

处理音量键方法：

/**
* @hide
*/
public void handleKeyDown(int keyCode, int stream) {
boolean mute = isStreamMute(AudioManager.STREAM_MUSIC);
switch (keyCode) {
case KeyEvent.KEYCODE_VOLUME_UP:
case KeyEvent.KEYCODE_VOLUME_DOWN:

/* *
* if audio is mute, turn off mute.
* Add by huanggenda 
* */
if (mute) {
setStreamMute(AudioManager.STREAM_MUSIC, false);
int volume = getStreamVolume(AudioManager.STREAM_MUSIC);
if (volume == 0) {
if (keyCode == KeyEvent.KEYCODE_VOLUME_DOWN) {
setStreamMute(AudioManager.STREAM_MUSIC, true);
break;
} else if (keyCode == KeyEvent.KEYCODE_VOLUME_UP) {
setStreamMute(AudioManager.STREAM_SYSTEM, false);
setStreamMute(AudioManager.STREAM_NOTIFICATION, false);
}
} else {
setStreamMute(AudioManager.STREAM_SYSTEM, false);
setStreamMute(AudioManager.STREAM_NOTIFICATION, false);
adjustStreamVolume(AudioManager.STREAM_MUSIC, 
AudioManager.ADJUST_SAME, 
AudioManager.FLAG_SHOW_UI);
break;
}
}
/* The end to add by huanggenda */
/*
* Adjust the volume in on key down since it is more
* responsive to the user.
*/
int flags = FLAG_SHOW_UI | FLAG_VIBRATE;
if (mVolumeControlStream != -1) {
stream = mVolumeControlStream;
flags |= FLAG_FORCE_STREAM;
}
adjustSuggestedStreamVolume(
keyCode == KeyEvent.KEYCODE_VOLUME_UP
? ADJUST_RAISE
: ADJUST_LOWER,
stream,
flags);

/* *
* If the volume is 0, turn on mute.
* Add by huanggenda 
* */
if (stream == AudioManager.STREAM_MUSIC) {
int v = getStreamVolume(AudioManager.STREAM_MUSIC);
mute = isStreamMute(AudioManager.STREAM_MUSIC);
if (!mute && (v == 0)) {
setStreamMute(AudioManager.STREAM_SYSTEM, true);
setStreamMute(AudioManager.STREAM_MUSIC, true);
setStreamMute(AudioManager.STREAM_NOTIFICATION, true);
adjustStreamVolume(stream,
AudioManager.ADJUST_SAME, 
AudioManager.FLAG_SHOW_UI);
}
}
/* The end to add by huanggenda */
break;
case KeyEvent.KEYCODE_VOLUME_MUTE:
// TODO: Actually handle MUTE.
mute = !mute;
setStreamMute(AudioManager.STREAM_SYSTEM, mute);
setStreamMute(AudioManager.STREAM_MUSIC, mute);
setStreamMute(AudioManager.STREAM_NOTIFICATION, mute);
adjustStreamVolume(AudioManager.STREAM_MUSIC, 
AudioManager.ADJUST_SAME, 
AudioManager.FLAG_SHOW_UI);
break;
}
}

3.编译系统

. build/envsetup.sh
lunch 3 (android4.0.1是10,android4.0.3是4)
make clean
make

4.系统烧录工具,    nand_tool_new,packet_tool_4.0,这两个工具是由中星微原厂提供，使用方法：

步骤一：运行packet_tool_4.0中Vortexpacket.exe，加载ubi.cache8k_256_2048.img，ubi.data8k_256_2048.img，ubi.system8k_256_2048.img，ubi.userdata8k_256_2048.img四个文件，这四个文件在out/target/product/vortex/8k_256_2048/ 目录下，然后点击转换按钮进行转换生成vortex.pak文件

步骤二：运行 nand_tool_new中MPTool.exe，设置vortex.pak路径，再扫描设备，在下载系统就可以了。