这种做法没有删除任何adb相关的东西,只是设置persist.sys.usb.config中的adb相关属性时添加宏控制。
userdebug版本一样可以禁用
添加宏开关
- device/mediatek/mt6761/BoardConfig.mk
java
# for adb
ADB_ENABLE:=false
添加ro.adb.enabled属性
- build/make/core/main.mk
java
# for adb
ifeq (true,$(strip $(ADB_ENABLE)))
ADDITIONAL_SYSTEM_PROPERTIES += ro.adb.enabled=1
else
ADDITIONAL_SYSTEM_PROPERTIES += ro.adb.enabled=0
endif
根据ro.adb.enabled设置persist.sys.usb.config
- system/core/init/property_service.cpp
java
static uint32_t PropertySet(const std::string& name, const std::string& value, std::string* error) {
// for adb
if (name == "persist.sys.usb.config" /*|| name == "sys.usb.config"*/){
LOG(INFO) << " name= " << name << " value= " << value;
std::string adb_value = GetProperty("ro.adb.enabled", "0");
if (adb_value == "0"){
if (value.find("adb") != std::string::npos){
LOG(ERROR) << " ro.adb.enabled is 0, adb is not allowed ";
return PROP_SUCCESS;
}
}
}
// end
size_t valuelen = value.size();
if (!IsLegalPropertyName(name)) {
*error = "Illegal property name";
return PROP_ERROR_INVALID_NAME;
}
if (auto result = IsLegalPropertyValue(name, value); !result.ok()) {
*error = result.error().message();
return PROP_ERROR_INVALID_VALUE;
}
#ifdef MTK_LOG
SnapshotPropertyFlowTraceLog("_spf");
#endif
prop_info* pi = (prop_info*) __system_property_find(name.c_str());
if (pi != nullptr) {
// ro.* properties are actually "write-once".
if (StartsWith(name, "ro.")) {
*error = "Read-only property was already set";
return PROP_ERROR_READ_ONLY_PROPERTY;
}
#ifdef MTK_LOG
SnapshotPropertyFlowTraceLog("_spu");
#endif
__system_property_update(pi, value.c_str(), valuelen);
} else {
#ifdef MTK_LOG
SnapshotPropertyFlowTraceLog("_spa");
#endif
int rc = __system_property_add(name.c_str(), name.size(), value.c_str(), valuelen);
if (rc < 0) {
*error = "__system_property_add failed";
return PROP_ERROR_SET_FAILED;
}
}
// Don't write properties to disk until after we have read all default
// properties to prevent them from being overwritten by default values.
if (persistent_properties_loaded && StartsWith(name, "persist.")) {
WritePersistentProperty(name, value);
}
// If init hasn't started its main loop, then it won't be handling property changed messages
// anyway, so there's no need to try to send them.
auto lock = std::lock_guard{accept_messages_lock};
if (accept_messages) {
#ifdef MTK_LOG
SnapshotPropertyFlowTraceLog("SPC");
#endif
PropertyChanged(name, value);
}
#ifdef MTK_LOG
if (GetMTKLOGDISABLERATELIMIT()) // MTK add log
PropSetLog(name, value, error);
#endif
return PROP_SUCCESS;
}
相关UI及开发者模式控制
- frameworks/base/core/java/android/os/Build.java
java
/*
* True if Adb is enabled
*/
public static final boolean IS_ADB_ENABLED =
SystemProperties.getInt("ro.adb.enabled", 0) == 1;
- vendor/mediatek/proprietary/packages/apps/MtkSettings/src/com/android/settings/SettingsActivity.java
java
// True if Adb is enabled
final boolean showDev = Build.IS_ADB_ENABLED/*DevelopmentSettingsEnabler.isDevelopmentSettingsEnabled(this)
&& !Utils.isMonkeyRunning()*/;
somethingChanged = setTileEnabled(changedList, new ComponentName(packageName,
Settings.DevelopmentSettingsDashboardActivity.class.getName()),
showDev, isAdmin)
|| somethingChanged;
- vendor/mediatek/proprietary/packages/apps/MtkSettings/src/com/android/settings/connecteddevice/usb/UsbDetailsFunctionsController.java
java
@Override
public boolean isAvailable() {
// for adb
// True if Adb is enabled
return Build.IS_ADB_ENABLED/*!Utils.isMonkeyRunning()*/;
}
- vendor/mediatek/proprietary/packages/apps/MtkSettings/src/com/android/settings/deviceinfo/BuildNumberPreferenceController.java
java
@Override
public boolean handlePreferenceTreeClick(Preference preference) {
// for adb
if (preference.getKey().equals("build_number")){
if (!Build.IS_ADB_ENABLED){
preference.setSelectable(false);
}
}
// end
if (!TextUtils.equals(preference.getKey(), getPreferenceKey())) {
return false;
}
...
}
修改完后,连接USB不会显示功能选择列表,无法连点调出开发者模式。
测试
编译完成后,build.prop中显示
java
ro.adb.enabled=0
...
# Auto-added by post_process_props.py
persist.sys.usb.config=adb
# end of file
命令窗口显示
java
C:\Users\dell>adb devices
List of devices attached
C:\Users\dell>