Subtext of "Add device" should only show when BT is off

Bug: 73960246
Test: Manual test & make RunSettingsRoboTests
Change-Id: I6eb5fbed20a4ffc923faf992bbf0b30a817444a0

res/xml/connected_devices.xml

@@ -36,7 +36,8 @@
         android:summary="@string/connected_device_add_device_summary"
         settings:allowDividerAbove="true"
         settings:userRestriction="no_config_bluetooth"
-        settings:useAdminDisabledSummary="true"/>
+        settings:useAdminDisabledSummary="true"
+        settings:controller="com.android.settings.connecteddevice.AddDevicePreferenceController"/>
 
     <Preference
         android:fragment="com.android.settings.connecteddevice.AdvancedConnectedDeviceDashboardFragment"

src/com/android/settings/connecteddevice/AddDevicePreferenceController.java

@@ -0,0 +1,98 @@
+/*
+ * Copyright (C) 2018 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.connecteddevice;
+
+import android.bluetooth.BluetoothAdapter;
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+import android.content.IntentFilter;
+import android.content.pm.PackageManager;
+import android.support.v7.preference.Preference;
+import android.support.v7.preference.PreferenceScreen;
+
+import com.android.settings.core.BasePreferenceController;
+import com.android.settings.R;
+import com.android.settingslib.core.lifecycle.LifecycleObserver;
+import com.android.settingslib.core.lifecycle.events.OnStart;
+import com.android.settingslib.core.lifecycle.events.OnStop;
+
+/**
+ * Controller to maintain the {@link android.support.v7.preference.Preference} for add
+ * device. It monitor Bluetooth's status(on/off) and decide if need to show summary or not.
+ */
+public class AddDevicePreferenceController extends BasePreferenceController
+        implements LifecycleObserver, OnStart, OnStop {
+
+    private static final String KEY = "add_bt_devices";
+
+    private Preference mPreference;
+    private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
+        @Override
+        public void onReceive(Context context, Intent intent) {
+            updateState();
+        }
+    };
+    private IntentFilter mIntentFilter;
+    private BluetoothAdapter mBluetoothAdapter;
+
+    public AddDevicePreferenceController(Context context) {
+        super(context, KEY);
+        mIntentFilter = new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED);
+        mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
+    }
+
+    @Override
+    public void onStart() {
+        mContext.registerReceiver(mReceiver, mIntentFilter);
+    }
+
+    @Override
+    public void onStop() {
+        mContext.unregisterReceiver(mReceiver);
+    }
+
+    @Override
+    public void displayPreference(PreferenceScreen screen) {
+        super.displayPreference(screen);
+        if (isAvailable()) {
+            mPreference = (Preference) screen.findPreference(getPreferenceKey());
+        }
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        return mContext.getPackageManager().hasSystemFeature(PackageManager.FEATURE_BLUETOOTH)
+                ? AVAILABLE
+                : DISABLED_UNSUPPORTED;
+    }
+
+    @Override
+    public String getPreferenceKey() {
+        return KEY;
+    }
+
+    @Override
+    public CharSequence getSummary() {
+        return mBluetoothAdapter != null && mBluetoothAdapter.isEnabled()
+                ? ""
+                : mContext.getString(R.string.connected_device_add_device_summary);
+    }
+
+    void updateState() {
+        updateState(mPreference);
+    }
+}

tests/robotests/src/com/android/settings/connecteddevice/AddDevicePreferenceControllerTest.java

@@ -0,0 +1,132 @@
+/*
+ * Copyright (C) 2018 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.connecteddevice;
+
+import static com.android.settings.core.BasePreferenceController.AVAILABLE;
+import static com.android.settings.core.BasePreferenceController.DISABLED_UNSUPPORTED;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import static junit.framework.Assert.assertTrue;
+
+import static org.mockito.Mockito.when;
+
+import android.bluetooth.BluetoothAdapter;
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+import android.content.pm.PackageManager;
+import android.support.v7.preference.Preference;
+import android.support.v7.preference.PreferenceManager;
+import android.support.v7.preference.PreferenceScreen;
+import android.text.TextUtils;
+
+import com.android.settings.R;
+import com.android.settings.testutils.SettingsRobolectricTestRunner;
+import com.android.settingslib.RestrictedPreference;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+import org.robolectric.RuntimeEnvironment;
+import org.robolectric.Shadows;
+import org.robolectric.annotation.Config;
+import org.robolectric.shadows.ShadowApplicationPackageManager;
+import org.robolectric.util.ReflectionHelpers;
+
+@RunWith(SettingsRobolectricTestRunner.class)
+@Config(shadows = ShadowApplicationPackageManager.class)
+public class AddDevicePreferenceControllerTest {
+
+    @Mock
+    private PreferenceScreen mScreen;
+    @Mock
+    private BluetoothAdapter mBluetoothAdapter;
+
+    private Context mContext;
+    private AddDevicePreferenceController mAddDevicePreferenceController;
+    private RestrictedPreference mAddDevicePreference;
+    private ShadowApplicationPackageManager mPackageManager;
+
+
+    @Before
+    public void setUp() {
+        MockitoAnnotations.initMocks(this);
+
+        mContext = RuntimeEnvironment.application;
+        mPackageManager = (ShadowApplicationPackageManager) Shadows.shadowOf(
+                mContext.getPackageManager());
+        mPackageManager.setSystemFeature(PackageManager.FEATURE_BLUETOOTH, true);
+
+        mAddDevicePreferenceController = new AddDevicePreferenceController(mContext);
+        ReflectionHelpers.setField(mAddDevicePreferenceController,
+                "mBluetoothAdapter", mBluetoothAdapter);
+
+        String key = mAddDevicePreferenceController.getPreferenceKey();
+        mAddDevicePreference = new RestrictedPreference(mContext);
+        mAddDevicePreference.setKey(key);
+        when(mScreen.findPreference(key)).thenReturn(mAddDevicePreference);
+        mAddDevicePreferenceController.displayPreference(mScreen);
+    }
+
+    @Test
+    public void addDevice_bt_resume_on_then_off() {
+        when(mBluetoothAdapter.isEnabled()).thenReturn(true);
+        mAddDevicePreferenceController.updateState();
+        assertTrue(TextUtils.isEmpty(mAddDevicePreference.getSummary()));
+
+        Intent intent = new Intent(BluetoothAdapter.ACTION_STATE_CHANGED);
+        intent.putExtra(BluetoothAdapter.EXTRA_STATE, BluetoothAdapter.STATE_OFF);
+        BroadcastReceiver receiver = ReflectionHelpers.getField(
+                mAddDevicePreferenceController, "mReceiver");
+        when(mBluetoothAdapter.isEnabled()).thenReturn(false);
+        receiver.onReceive(mContext, intent);
+        assertThat(mAddDevicePreference.getSummary()).isEqualTo(
+                mContext.getString(R.string.connected_device_add_device_summary));
+    }
+
+    @Test
+    public void addDevice_bt_resume_off_then_on() {
+        when(mBluetoothAdapter.isEnabled()).thenReturn(false);
+        mAddDevicePreferenceController.updateState();
+        assertThat(mAddDevicePreference.getSummary()).isEqualTo(
+                mContext.getString(R.string.connected_device_add_device_summary));
+
+        Intent intent = new Intent(BluetoothAdapter.ACTION_STATE_CHANGED);
+        intent.putExtra(BluetoothAdapter.EXTRA_STATE, BluetoothAdapter.STATE_ON);
+        BroadcastReceiver receiver = ReflectionHelpers.getField(
+                mAddDevicePreferenceController, "mReceiver");
+        when(mBluetoothAdapter.isEnabled()).thenReturn(true);
+        receiver.onReceive(mContext, intent);
+        assertTrue(TextUtils.isEmpty(mAddDevicePreference.getSummary()));
+    }
+
+    @Test
+    public void addDevice_Availability_UnSupported() {
+        mPackageManager.setSystemFeature(PackageManager.FEATURE_BLUETOOTH, false);
+        assertThat(mAddDevicePreferenceController.getAvailabilityStatus())
+                .isEqualTo(DISABLED_UNSUPPORTED);
+    }
+
+    @Test
+    public void addDevice_Availability_Supported() {
+        mPackageManager.setSystemFeature(PackageManager.FEATURE_BLUETOOTH, true);
+        assertThat(mAddDevicePreferenceController.getAvailabilityStatus())
+                .isEqualTo(AVAILABLE);
+    }
+}