Add developer option to disable automatic adb grant revocation

Android 10 introduced a security feature to automatically revoke
adb authorizations for systems that have not reconnected to the device
within 7 days. While this is helpful for consumers that enable adb for
a one time task and mistakenly select the 'always allow' option,
feedback has indicated having a developer option to disable this feature
would be beneficial.

Bug: 119510647
Test: make RunSettingsRoboTests ROBOTEST_FILTER=AdbAuthorizationTimeoutPreferenceControllerTest
Change-Id: I7eb123e8c69956aa02bb679784ac79650baf5dcb

src/com/android/settings/development/AdbAuthorizationTimeoutPreferenceController.java

@@ -0,0 +1,79 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.development;
+
+import android.content.Context;
+import android.provider.Settings;
+
+import androidx.preference.Preference;
+import androidx.preference.SwitchPreference;
+
+import com.android.settingslib.development.DeveloperOptionsPreferenceController;
+
+/**
+ * Preference controller for the developer option to disable the automatic revocation of adb
+ * authorizations.
+ */
+public class AdbAuthorizationTimeoutPreferenceController extends
+        DeveloperOptionsPreferenceController implements Preference.OnPreferenceChangeListener {
+    private static final String ADB_AUTHORIZATION_TIMEOUT_KEY = "adb_authorization_timeout";
+
+    private final Context mContext;
+
+    public AdbAuthorizationTimeoutPreferenceController(Context context) {
+        super(context);
+        mContext = context;
+    }
+
+    @Override
+    public String getPreferenceKey() {
+        return ADB_AUTHORIZATION_TIMEOUT_KEY;
+    }
+
+    @Override
+    public void updateState(Preference preference) {
+        final long authTimeout = Settings.Global.getLong(mContext.getContentResolver(),
+                Settings.Global.ADB_ALLOWED_CONNECTION_TIME,
+                Settings.Global.DEFAULT_ADB_ALLOWED_CONNECTION_TIME);
+        // An authTimeout of 0 indicates this preference is enabled and adb authorizations will not
+        // be automatically revoked.
+        ((SwitchPreference) mPreference).setChecked(authTimeout == 0);
+    }
+
+    @Override
+    public boolean onPreferenceChange(Preference preference, Object newValue) {
+        writeSetting((boolean) newValue);
+        return true;
+    }
+
+    @Override
+    public void onDeveloperOptionsSwitchDisabled() {
+        super.onDeveloperOptionsSwitchDisabled();
+        writeSetting(false);
+        ((SwitchPreference) mPreference).setChecked(false);
+    }
+
+    private void writeSetting(boolean isEnabled) {
+        long authTimeout = 0;
+        if (!isEnabled) {
+            authTimeout = Settings.Global.DEFAULT_ADB_ALLOWED_CONNECTION_TIME;
+        }
+        Settings.Global.putLong(mContext.getContentResolver(),
+                Settings.Global.ADB_ALLOWED_CONNECTION_TIME,
+                authTimeout);
+    }
+}

src/com/android/settings/development/DevelopmentSettingsDashboardFragment.java

@@ -444,6 +444,7 @@ public class DevelopmentSettingsDashboardFragment extends RestrictedDashboardFra
         controllers.add(new AdbPreferenceController(context, fragment));
         controllers.add(new ClearAdbKeysPreferenceController(context, fragment));
         controllers.add(new WirelessDebuggingPreferenceController(context, lifecycle));
+        controllers.add(new AdbAuthorizationTimeoutPreferenceController(context));
         controllers.add(new LocalTerminalPreferenceController(context));
         controllers.add(new BugReportInPowerPreferenceController(context));
         controllers.add(new AutomaticSystemServerHeapDumpPreferenceController(context));