Android绕过usb主机permision确认对话框framework修改方案

来源：互联网发布：滨州大数据产业园编辑：程序博客网时间：2024/06/15 08:29

在Android平板上连接USB读卡器，每次启动应用程序时总是会出现USB权限确认对话框提示（如下图所示）。
USB权限提示对话框
即使点选“默认情况下用于该USB设备后”在设备重启后也会出现该权限提示，最后笔者通过修改Android Framework层的代码解决，解决方案的原理可以自行分析Android Framwork源码。
解决方案如下：
1. 修改
($ANDROID_PROJ)\frameworks\base\packages\SystemUI\src\com\android\systemui\usb\UsbPermissionActivity.Java，将onCreate(Bundle icicle)函数修改为以下代码。

public void onCreate(Bundle icicle) {   super.onCreate(icicle);   Intent intent = getIntent();   mDevice = (UsbDevice)intent.getParcelableExtra(UsbManager.EXTRA_DEVICE);   mAccessory = (UsbAccessory)intent.getParcelableExtra(UsbManager.EXTRA_ACCESSORY);   mPendingIntent = (PendingIntent)intent.getParcelableExtra(Intent.EXTRA_INTENT);   mUid = intent.getIntExtra(Intent.EXTRA_UID, -1);   mPackageName = intent.getStringExtra("package");   PackageManager packageManager = getPackageManager();   ApplicationInfo aInfo;   try {       aInfo = packageManager.getApplicationInfo(mPackageName, 0);   } catch (PackageManager.NameNotFoundException e) {       Log.e(TAG, "unable to look up package name", e);       finish();       return;   }   String appName = aInfo.loadLabel(packageManager).toString();   final AlertController.AlertParams ap = mAlertParams;   ap.mIcon = aInfo.loadIcon(packageManager);   ap.mTitle = appName;   if (mDevice == null) {       ap.mMessage = getString(R.string.usb_accessory_permission_prompt, appName);       mDisconnectedReceiver = new UsbDisconnectedReceiver(this, mAccessory);   } else {       ap.mMessage = getString(R.string.usb_device_permission_prompt, appName);       mDisconnectedReceiver = new UsbDisconnectedReceiver(this, mDevice);   }   ap.mPositiveButtonText = getString(android.R.string.ok);   ap.mNegativeButtonText = getString(android.R.string.cancel);   ap.mPositiveButtonListener = this;   ap.mNegativeButtonListener = this;   // add "always use" checkbox   LayoutInflater inflater = (LayoutInflater)getSystemService(           Context.LAYOUT_INFLATER_SERVICE);   ap.mView = inflater.inflate(com.android.internal.R.layout.always_use_checkbox, null);   mAlwaysUse = (CheckBox)ap.mView.findViewById(com.android.internal.R.id.alwaysUse);   if (mDevice == null) {       mAlwaysUse.setText(R.string.always_use_accessory);   } else {       mAlwaysUse.setText(R.string.always_use_device);   }   mAlwaysUse.setOnCheckedChangeListener(this);   mClearDefaultHint = (TextView)ap.mView.findViewById(                                               com.android.internal.R.id.clearDefaultHint);   mClearDefaultHint.setVisibility(View.GONE);   //setupAlert();   mPermissionGranted = true;   finish();}1
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粗体中为修改点，这也是stackoverflow中提到的点，但是实测发现仅仅修改这不能达到目标。
2. 修改
($ANDROID_PROJ)\frameworks\base\services\java\com\android\server\usb\UsbSettingsManager.java，依次修改hasPermission(UsbDevice device)、hasPermission(UsbAccessory accessory)、checkPermission(UsbDevice device)、checkPermission(UsbAccessory accessory)、requestPermission(UsbDevice device, String packageName, PendingIntent pi)、requestPermission(UsbAccessory accessory, String packageName, PendingIntent pi)等6个函数，修改代码如下。

public boolean hasPermission(UsbDevice device) {        synchronized (mLock) {            //int uid = Binder.getCallingUid();            //if (uid == Process.SYSTEM_UID) {            //    return true;            //}            //SparseBooleanArray uidList = mDevicePermissionMap.get(device.getDeviceName());            //if (uidList == null) {            //    return false;            //}            //return uidList.get(uid);            return true;        }    }1
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public boolean hasPermission(UsbAccessory accessory) {        synchronized (mLock) {            //int uid = Binder.getCallingUid();            //if (uid == Process.SYSTEM_UID) {            //    return true;            //}            //SparseBooleanArray uidList = mAccessoryPermissionMap.get(accessory);            //if (uidList == null) {            //    return false;            //}            //return uidList.get(uid);            return true;        }    }1
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public void checkPermission(UsbDevice device) {        //if (!hasPermission(device)) {        //    throw new SecurityException("User has not given permission to device " + device);        //}    }1
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public void checkPermission(UsbAccessory accessory) {        //if (!hasPermission(accessory)) {        //    throw new SecurityException("User has not given permission to accessory " + accessory);        //}    }1
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public void requestPermission(UsbDevice device, String packageName, PendingIntent pi) {      Intent intent = new Intent();        // respond immediately if permission has already been granted      //if (hasPermission(device)) {      if (true) {                     intent.putExtra(UsbManager.EXTRA_DEVICE, device);            intent.putExtra(UsbManager.EXTRA_PERMISSION_GRANTED, true);            try {                pi.send(mUserContext, 0, intent);            } catch (PendingIntent.CanceledException e) {                if (DEBUG) Slog.d(TAG, "requestPermission PendingIntent was cancelled");            }            return;        }        // start UsbPermissionActivity so user can choose an activity        intent.putExtra(UsbManager.EXTRA_DEVICE, device);        requestPermissionDialog(intent, packageName, pi);    }1
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public void requestPermission(UsbAccessory accessory, String packageName, PendingIntent pi) {        Intent intent = new Intent();        // respond immediately if permission has already been granted        //if (hasPermission(accessory)) {        if (true) {            intent.putExtra(UsbManager.EXTRA_ACCESSORY, accessory);            intent.putExtra(UsbManager.EXTRA_PERMISSION_GRANTED, true);            try {                pi.send(mUserContext, 0, intent);            } catch (PendingIntent.CanceledException e) {                if (DEBUG) Slog.d(TAG, "requestPermission PendingIntent was cancelled");            }            return;        }        intent.putExtra(UsbManager.EXTRA_ACCESSORY, accessory);        requestPermissionDialog(intent, packageName, pi);    }1
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修改完成后重新编译framework得到system，update固件就OK了。
都是做减法，所以是不是so easy，目前通过测试暂时未发现副作用，如果有问题欢迎交流。

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