Add visibility control to ADB QR code preference.

The preference should be hidden if isAdbWifiQrSupported() is false.

Bug: 150163684
Bug: 149843499

Test: make RunSettingsRoboTests ROBOTEST_FILTER=AdbQrCodePreferenceControllerTest
Change-Id: I3e833440fb1a6f369ac97cec8db04f2b99dd4640
(cherry picked from commit 6178918653)
Exempt-From-Owner-Approval: cherry-pick

src/com/android/settings/development/AdbQrCodePreferenceController.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.app.settings.SettingsEnums;
+import android.content.Context;
+import android.debug.IAdbManager;
+import android.os.RemoteException;
+import android.os.ServiceManager;
+import android.text.TextUtils;
+import android.util.Log;
+
+import androidx.fragment.app.Fragment;
+import androidx.preference.Preference;
+
+import com.android.settings.core.BasePreferenceController;
+import com.android.settings.core.SubSettingLauncher;
+
+/**
+ * Controller for the "Pair device with QR code" preference in the Wireless debugging
+ * fragment.
+ */
+public class AdbQrCodePreferenceController extends BasePreferenceController {
+    private static final String TAG = "AdbQrCodePrefCtrl";
+
+    private IAdbManager mAdbManager;
+    private Fragment mParentFragment;
+
+    public AdbQrCodePreferenceController(Context context, String key) {
+        super(context, key);
+
+        mAdbManager = IAdbManager.Stub.asInterface(ServiceManager.getService(
+                Context.ADB_SERVICE));
+    }
+
+    public void setParentFragment(Fragment parent) {
+        mParentFragment = parent;
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        try {
+            return mAdbManager.isAdbWifiQrSupported() ? AVAILABLE : UNSUPPORTED_ON_DEVICE;
+        } catch (RemoteException e) {
+            Log.e(TAG, "Unable to check if adb wifi QR code scanning is supported.", e);
+        }
+
+        return UNSUPPORTED_ON_DEVICE;
+    }
+
+    @Override
+    public boolean handlePreferenceTreeClick(Preference preference) {
+        if (!TextUtils.equals(preference.getKey(), getPreferenceKey())) {
+            return false;
+        }
+
+        new SubSettingLauncher(preference.getContext())
+                .setDestination(AdbQrcodeScannerFragment.class.getName())
+                .setSourceMetricsCategory(SettingsEnums.SETTINGS_ADB_WIRELESS)
+                .setResultListener(mParentFragment,
+                    WirelessDebuggingFragment.PAIRING_DEVICE_REQUEST)
+                .launch();
+        return true;
+    }
+}