Introduce ClearAdbKeysPreferenceController

- Create new ClearAdbKeysPreferenceController
 - Added ClearAdbKeysWarningDialog
 - Create controller inside the DashboardFragment
 - Port logic from DevelopmentSettings into the controller

Bug: 34203528
Test: make RunSettingsRoboTests -j40
Change-Id: Ia12bfee753f2c9222e6d833b1fb7e099f3602fdf

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

@@ -0,0 +1,105 @@
+/*
+ * Copyright (C) 2017 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.hardware.usb.IUsbManager;
+import android.os.RemoteException;
+import android.os.ServiceManager;
+import android.os.SystemProperties;
+import android.os.UserManager;
+import android.support.annotation.VisibleForTesting;
+import android.support.v7.preference.Preference;
+import android.support.v7.preference.PreferenceScreen;
+import android.text.TextUtils;
+import android.util.Log;
+
+public class ClearAdbKeysPreferenceController extends DeveloperOptionsPreferenceController {
+
+    private static final String TAG = "ClearAdbPrefCtrl";
+    private static final String CLEAR_ADB_KEYS = "clear_adb_keys";
+
+    @VisibleForTesting
+    static final String RO_ADB_SECURE_PROPERTY_KEY = "ro.adb.secure";
+
+    private final IUsbManager mUsbManager;
+    private final DevelopmentSettingsDashboardFragment mFragment;
+
+    private Preference mPreference;
+
+    public ClearAdbKeysPreferenceController(Context context,
+            DevelopmentSettingsDashboardFragment fragment) {
+        super(context);
+
+        mFragment = fragment;
+        mUsbManager = IUsbManager.Stub.asInterface(ServiceManager.getService(Context.USB_SERVICE));
+    }
+
+    @Override
+    public boolean isAvailable() {
+        return SystemProperties.getBoolean(RO_ADB_SECURE_PROPERTY_KEY, false /* default */);
+    }
+
+    @Override
+    public String getPreferenceKey() {
+        return CLEAR_ADB_KEYS;
+    }
+
+    @Override
+    public void displayPreference(PreferenceScreen screen) {
+        super.displayPreference(screen);
+
+        mPreference = screen.findPreference(getPreferenceKey());
+        if (mPreference != null && !isAdminUser()) {
+            mPreference.setEnabled(false);
+        }
+    }
+
+    @Override
+    public boolean handlePreferenceTreeClick(Preference preference) {
+        if (TextUtils.equals(preference.getKey(), getPreferenceKey())) {
+            ClearAdbKeysWarningDialog.show(mFragment);
+            return true;
+        }
+        return false;
+    }
+
+    @Override
+    protected void onDeveloperOptionsSwitchEnabled() {
+        if (isAdminUser()) {
+            mPreference.setEnabled(true);
+        }
+    }
+
+    @Override
+    protected void onDeveloperOptionsSwitchDisabled() {
+        mPreference.setEnabled(false);
+    }
+
+    public void onClearAdbKeysConfirmed() {
+        try {
+            mUsbManager.clearUsbDebuggingKeys();
+        } catch (RemoteException e) {
+            Log.e(TAG, "Unable to clear adb keys", e);
+        }
+    }
+
+    @VisibleForTesting
+    boolean isAdminUser() {
+        return ((UserManager) mContext.getSystemService(Context.USER_SERVICE)).isAdminUser();
+    }
+}