Question

如何开启YII系统默认的DEBUG

Answer 1

[Description] 如何默认打开user debug 选项 [Keyword] user debug root [Solution] 1. 在android 4.0 之前，这个设置是在frameworks/base/service/..../SystemServer.java 里面设置会根据system property 的persist.service.adb.enable 来设置。您可以看到类似如代码： // make sure the ADB_ENABLED setting value matches the secure property value Settings.Secure.putInt(mContentResolver, Settings.Secure.ADB_ENABLED, "1".equals(SystemProperties.get("persist.service.adb.enable")) ? 1 : 0); // register observer to listen for settings changes mContentResolver.registerContentObserver(Settings.Secure.getUriFor(Settings.Secure.ADB_ENABLED), false, new AdbSettingsObserver()); 而这个persist.service.adb.enable 默认是放在在default.prop 中，在编译的时候在build/core/main.mk 中确认, ifeq (true,$(strip $(enable_target_debugging))) # Target is more debuggable and adbd is on by default ADDITIONAL_DEFAULT_PROPERTIES += ro.debuggable=1 persist.service.adb.enable=1 # Include the debugging/testing OTA keys in this build. INCLUDE_TEST_OTA_KEYS := true else # !enable_target_debugging # Target is less debuggable and adbd is off by default ADDITIONAL_DEFAULT_PROPERTIES += ro.debuggable=0 persist.service.adb.enable=0 endif # !enable_target_debugging 您需要将: ADDITIONAL_DEFAULT_PROPERTIES += ro.debuggable=0 persist.service.adb.enable=0 改成 ADDITIONAL_DEFAULT_PROPERTIES += ro.debuggable=1 persist.service.adb.enable=1 2. 在android 4.0 之后，因为adb 的控制，统一使用了persist.sys.usb.config 来控制，于是对应的设置点也改到了frameworks/base/service/...../usb/UsbDeviceManager.java 中，您也可以看到类似的代码如： public UsbHandler(Looper looper) { // persist.sys.usb.config should never be unset. But if it is, set it to "adb" // so we have a chance of debugging what happened. mDefaultFunctions = SystemProperties.get("persist.sys.usb.config", "adb"); // sanity check the sys.usb.config system property // this may be necessary if we crashed while switching USB configurations String config = SystemProperties.get("sys.usb.config", "none"); if (!config.equals(mDefaultFunctions)) { Slog.w(TAG, "resetting config to persistent property: " + mDefaultFunctions); SystemProperties.set("sys.usb.config", mDefaultFunctions); } mCurrentFunctions = mDefaultFunctions; String state = FileUtils.readTextFile(new File(STATE_PATH), 0, null).trim(); updateState(state); mAdbEnabled = containsFunction(mCurrentFunctions, UsbManager.USB_FUNCTION_ADB); public void systemReady() { // make sure the ADB_ENABLED setting value matches the current state Settings.Secure.putInt(mContentResolver, Settings.Secure.ADB_ENABLED, mAdbEnabled ? 1 : 0); 而这个persist.sys.usb.config 中adb 的配置是在alps/build/tools/post_process_props.py 中根据ro.debuggable = 1 or 0 来设置，1 就是开启adb, 0 即关闭adb debug. 而这个ro.debuggable 也是在alps/build/core/main.mk 中设置，和2.3 修改类似 不过您这样打开之后，对于user 版本adb shell 开启的还是shell 权限，而不是root 权限，如果您需要root 权限，需要再改一下system/core/adb/adb.c 里面的should_drop_privileges() 这个函数，在#ifndef ALLOW_ADBD_ROOT 时return 0; 而不是return 1; 即可。