Android11编译第二弹：USB连接MTP模式+USB调试+USB信任

2023-12-16 10:03| 来源: 网络整理| 查看: 265

一、为什么需要开启USB信任和ADB调试

问题1：原始的AOSP，如果通过USB连接设备以后，会弹窗提示用户选择连接模式：MTP，大容量磁盘，照片等模式；

问题2：USB连接设备以后，需要开启USB调试模式，才方便操作adb调试；

问题3：USB设备连接以后，电脑会弹窗是否信任设备，需要点击信任当前设备，否则设备连接不成功。

使用场景：我们是自己的系统，需要支持设备USB连接，以及adb远程调试(USB调试和TCP调回)，因此，系统需要默认支持USB连接，支持USB调试，默认信任连接的设备。

二、集成步骤 2.1 关闭USB调试弹窗

frameworks/base/packages/SystemUI/src/com/android/systemui/usb/UsbDebuggingActivity.java

@Override public void onCreate(Bundle icicle) { ...(省略) /** final AlertController.AlertParams ap = mAlertParams; ap.mTitle = getString(R.string.usb_debugging_title); ap.mMessage = getString(R.string.usb_debugging_message, fingerprints); ap.mPositiveButtonText = getString(R.string.usb_debugging_allow); ap.mNegativeButtonText = getString(android.R.string.cancel); ap.mPositiveButtonListener = this; ap.mNegativeButtonListener = this; // add "always allow" checkbox LayoutInflater inflater = LayoutInflater.from(ap.mContext); View checkbox = inflater.inflate(com.android.internal.R.layout.always_use_checkbox, null); mAlwaysAllow = (CheckBox)checkbox.findViewById(com.android.internal.R.id.alwaysUse); mAlwaysAllow.setText(getString(R.string.usb_debugging_always)); ap.mView = checkbox; window.setCloseOnTouchOutside(false); setupAlert(); **/ notifyService(true,true); finish(); }

默认只要USB连接设备，默认就开启USB调试。关键方法是notifyService

/** * Notifies the ADB service as to whether the current ADB request should be allowed, and if * subsequent requests from this key should be allowed without user consent. * * @param allow whether the connection should be allowed * @param alwaysAllow whether subsequent requests from this key should be allowed without user * consent */ private void notifyService(boolean allow, boolean alwaysAllow) { try { IBinder b = ServiceManager.getService(ADB_SERVICE); IAdbManager service = IAdbManager.Stub.asInterface(b); if (allow) { service.allowDebugging(alwaysAllow, mKey); } else { service.denyDebugging(); } mServiceNotified = true; } catch (Exception e) { Log.e(TAG, "Unable to notify Usb service", e); } }

这个方法很简单，通过ADB服务，设置允许调试。

mKey是什么呢？就是设备指纹，即我们常说的设备SN。

2.2 授权ADB调试5555端口

device/qcom/lahaina/init.target.rc

#Allow access to memory hotplug device attributes chown system system /sys/kernel/mem-offline/anon_migrate # ==== modify start===== zhouronghua open adb debug port 5555 setprop service.adb.tcp.port 5555 # ==== modify end===== 2.3 接收到USB连接默认开启USB调试

frameworks/base/packages/SystemUI/src/com/android/systemui/usb/UsbDebuggingActivity.java

在其中有监听USB连接和断开的广播接收器UsbDisconnectedReceiver，

private class UsbDisconnectedReceiver extends BroadcastReceiver { ...(省略) @Override public void onReceive(Context content, Intent intent) { String action = intent.getAction(); if (!UsbManager.ACTION_USB_STATE.equals(action)) { return; } // ====== modify begin ========== // fix: zhouronghua usb debug default auth // boolean connected = intent.getBooleanExtra(UsbManager.USB_CONNECTED, false); boolean connected = false; if (!connected) { Log.d(TAG, "USB disconnected, notifying service"); // notifyService(false); mActivity.finish(); } // open adb debugging notifyService(true, true); // =========== modify end ========== } }

开启USB调试，直接开启ADB调试即可，不需要单独开启USB调试，TCP调试。

2.4 USB授权默认信息

frameworks/base/packages/SystemUI/src/com/android/systemui/usb/UsbPermissionActivity.java

@Override public void onCreate(Bundle icicle) { ...(省略) setupAlert(); // ======= modify begin ========= // fix: zhouronghua usb default trust devices Log.d(TAG, "grant usb permission automatically"); mPermissionGranted = true; finish(); // ======= modify end ======= }

默认同意授权USB连接。

2.5 USB连接默认为MTP模式

USB管理器接收到USB连接监听

frameworks/base/services/usb/java/com/android/server/usb/UsbDeviceManager.java

USB连接默认采用MTP模式，且开启ADB调试。

@Override public void handleMessage(Message msg) { ...(省略) if (mBootCompleted) { if (!mConnected && !hasMessages(MSG_ACCESSORY_MODE_ENTER_TIMEOUT) && !hasMessages(MSG_FUNCTION_SWITCH_TIMEOUT)) { // restore defaults when USB is disconnected // fix: zhouronghua usb debug mode //if (!mScreenLocked // && mScreenUnlockedFunctions != UsbManager.FUNCTION_NONE) { // setScreenUnlockedFunctions(); //} else { //setEnabledFunctions(UsbManager.FUNCTION_NONE, false); // USB connect enable setEnabledFunctions(UsbManager.USB_FUNCTION_MTP, false); // adb enable setAdbEnabled(true) //} } updateUsbFunctions(); } protected void finishBoot() { if (mBootCompleted && mCurrentUsbFunctionsReceived && mSystemReady) { if (mPendingBootBroadcast) { updateUsbStateBroadcastIfNeeded(getAppliedFunctions(mCurrentFunctions)); mPendingBootBroadcast = false; } // ========== modify start =========== //if (!mScreenLocked // && mScreenUnlockedFunctions != UsbManager.FUNCTION_NONE) { // setScreenUnlockedFunctions(); //} else { // setEnabledFunctions(UsbManager.FUNCTION_NONE, false); //} // fix: zhouronghua USB enable setEnabledFunctions(UsbManager.USB_FUNCTION_MTP, false); // adb enable setAdbEnabled(true); // ======== modify end ================= 2.6 Release默认开启ADB调试

build/make/core/main.mk

build/make/core/main.mk ifeq (true,$(strip $(enable_target_debugging))) # Target is more debuggable and adbd is on by default ADDITIONAL_DEFAULT_PROPERTIES += ro.debuggable=1 # Enable Dalvik lock contention logging. ADDITIONAL_BUILD_PROPERTIES += dalvik.vm.lockprof.threshold=500 else # !enable_target_debugging # Target is less debuggable and adbd is off by default # ==== mofify begin ===== zhouronghua fix: adb debug mode ADDITIONAL_DEFAULT_PROPERTIES += ro.debuggable=1 # ==== modify end ==== endif # !enable_target_debugging

在Release版本也允许进行ADB调试

2.7 post_process_props.py开启adb调试

build/make/tools/post_process_props.py

# 1. 注释掉if prop.get("ro.debuggable") == "1"判断，Release也允许调试 # ==== modify begin fix: zhoronghua open adb debug mode # if prop.get("ro.debuggable") == "1": # ==== modify end ==== # 因为注释掉判断，判断体重的内容整体往前缩进 val = prop.get("persist.sys.usb.config") if "adb" not in val: if val == "": val = "adb" else: val = val + ",adb" prop.put("persist.sys.usb.config", val)

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