1. HFP命令AT+IPHONEACCEV
描述：报告耳机的状态变更
发起者：耳机
格式：AT+IPHONEACCEV=[Number of key/value pairs ],[key1 ],[val1 ],[key2
],[val2 ],…
参数：
Number of key/value pairs :接下来参数的数量
key:被报告状态变化的类型
1 =电量等级
2 =暂停状态
val:更改的值
Battery events:0-9之间数字的字符串 A
string value between ‘0’ and ‘9’.
Dock state: 0 = undocked, 1 = docked.
Example:AT+IPHONEACCEV=1,1,3
2.android framework修改点
packages/apps/Bluetooth/src/com/android/bluetooth/hfp/HeadsetStateMachine.java
BluetoothAssignedNumbers.APPLE可以随便用哪个公司的，但注册广播时要一致就行。
static {
classInitNative();
VENDOR_SPECIFIC_AT_COMMAND_COMPANY_ID = new HashMap();
VENDOR_SPECIFIC_AT_COMMAND_COMPANY_ID.put("+XEVENT",BluetoothAssignedNumbers.PLANTRONICS);
VENDOR_SPECIFIC_AT_COMMAND_COMPANY_ID.put("+ANDROID",BluetoothAssignedNumbers.GOOGLE); +VENDOR_SPECIFIC_AT_COMMAND_COMPANY_ID.put("+XAPL",BluetoothAssignedNumbers.APPLE);
+VENDOR_SPECIFIC_AT_COMMAND_COMPANY_ID.put("+IPHONEACCEV",BluetoothAssignedNumbers.APPLE);
}
获取蓝牙电量需要向蓝牙发送回复的at命令：
private booleanprocessVendorSpecificAt(String atString) {
log("processVendorSpecificAt - atString = " + atString);
// Currently we accept only SET type commands.
int indexOfEqual = atString.indexOf("=");
if (indexOfEqual == -1) {
Log.e(TAG, "processVendorSpecificAt: command type error in " +atString);
return false;
}
String command = atString.substring(0, indexOfEqual);
Integer companyId = VENDOR_SPECIFIC_AT_COMMAND_COMPANY_ID.get(command);
if (companyId == null) {
Log.e(TAG, "processVendorSpecificAt: unsupported command: " +atString);
return false;
}
String arg = atString.substring(indexOfEqual + 1);
if (arg.startsWith("?")) {
Log.e(TAG, "processVendorSpecificAt: command type error in " +atString);
return false;
}
Object[] args = generateArgs(arg);
+ if ("+XAPL".equals(command)) {
+ processAtXapl(args);
+ }
broadcastVendorSpecificEventIntent(command,
companyId,
BluetoothHeadset.AT_CMD_TYPE_SET,
args,
mCurrentDevice);
atResponseCodeNative(HeadsetHalConstants.AT_RESPONSE_OK, 0);
return true;
}
/**
* Process AT+XAPL AT command
* @param args command arguments after theequal sign
* @param device Remote device that hassent this command
*/
private void processAtXapl(Object[] args){
if (args.length != 2) {
Log.w(TAG, "processAtXapl()args length must be 2: " + String.valueOf(args.length));
return;
}
if (!(args[0] instanceof String) ||!(args[1] instanceof Integer)) {
Log.w(TAG, "processAtXapl()argument types not match");
return;
}
// feature = 2 indicates that wesupport battery level reporting only
Log.d("tsq77","+XAPL=iPhone,");
atResponseStringNative("+XAPL=iPhone," + String.valueOf(2));
}
2.上层app监听广播获取电量
packages/apps/Settings/src/com/android/settings/bluetooth/BluetoothSettings.java
在settings中的蓝牙界面中注册广播，然后把电量显示出来。
//aaron
IntentFilter filter=new IntentFilter();
filter.addAction(BluetoothHeadset.ACTION_VENDOR_SPECIFIC_HEADSET_EVENT);
//filter.addCategory(BluetoothHeadset.VENDOR_SPECIFIC_HEADSET_EVENT_COMPANY_ID_CATEGORY+"."+BluetoothAssignedNumbers.
APPLE);
filter.addCategory(BluetoothHeadset.VENDOR_SPECIFIC_HEADSET_EVENT_COMPANY_ID_CATEGORY+"."+BluetoothAssignedNumbers.
APPLE);
getActivity().registerReceiver(mIntentReceiver,filter);
Log.i("a", "registerReceiver ");
//end
private BroadcastReceiver mIntentReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
final String action = intent.getAction();
if(action.equals(BluetoothHeadset.ACTION_VENDOR_SPECIFIC_HEADSET_EVENT)) {
Log.i("a","intent "+intent);
String command=intent.getStringExtra(BluetoothHeadset.EXTRA_VENDOR_SPECIFIC_HEADSET_EVENT_CMD);
if("+IPHONEACCEV".equals(command)) {
Object[] args = (Object[])intent.getSerializableExtra(BluetoothHeadset.EXTRA_VENDOR_SPECIFIC_HEADSET_EVENT_ARGS);
if (args.length >= 3&& args[0] instanceof Integer &&((Integer)args[0])*2+1<=args.length) {
for (inti=0;i<((Integer)args[0]);i++) {
if(!(args[i*2+1] instanceof Integer) || !(args[i*2+2] instanceof Integer)) {
continue;
}
if(args[i*2+1].equals(1)) {
floatlevel=(((Integer)args[i*2+2])+1)/10.0f;//获取的电量百分比
break;
}
}
}
}
}
}
};
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