Misc fixes for items under system setting

- Show summary under virtual keyboard: list all avaiable keyboards
- Set about phone subtext to device model string.
- Update DND Suggestion text

Change-Id: I20acffcf691d1354c7636f5851b376099844700f
Fix: 35959817
Fix: 36395109
Test: robotests

src/com/android/settings/inputmethod/VirtualKeyboardPreferenceController.java

@@ -0,0 +1,89 @@
+/*
+ * 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.inputmethod;
+
+import android.app.admin.DevicePolicyManager;
+import android.content.Context;
+import android.content.pm.PackageManager;
+import android.support.v7.preference.Preference;
+import android.view.inputmethod.InputMethodInfo;
+import android.view.inputmethod.InputMethodManager;
+
+import com.android.settings.R;
+import com.android.settings.core.PreferenceController;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class VirtualKeyboardPreferenceController extends PreferenceController {
+
+    private final InputMethodManager mImm;
+    private final DevicePolicyManager mDpm;
+    private final PackageManager mPm;
+
+    public VirtualKeyboardPreferenceController(Context context) {
+        super(context);
+        mPm = mContext.getPackageManager();
+        mDpm = (DevicePolicyManager) context.getSystemService(Context.DEVICE_POLICY_SERVICE);
+        mImm = (InputMethodManager) mContext.getSystemService(Context.INPUT_METHOD_SERVICE);
+    }
+
+    @Override
+    public boolean isAvailable() {
+        return true;
+    }
+
+    @Override
+    public String getPreferenceKey() {
+        return "virtual_keyboard_pref";
+    }
+
+    @Override
+    public void updateState(Preference preference) {
+        final List<InputMethodInfo> imis = mImm.getEnabledInputMethodList();
+        if (imis == null) {
+            preference.setSummary(R.string.summary_empty);
+            return;
+        }
+
+        final List<String> permittedList = mDpm.getPermittedInputMethodsForCurrentUser();
+        final List<String> labels = new ArrayList<>();
+
+        for (InputMethodInfo imi : imis) {
+            final boolean isAllowedByOrganization = permittedList == null
+                    || permittedList.contains(imi.getPackageName());
+            if (!isAllowedByOrganization) {
+                continue;
+            }
+            labels.add(imi.loadLabel(mPm).toString());
+        }
+        if (labels.isEmpty()) {
+            preference.setSummary(R.string.summary_empty);
+            return;
+        }
+
+        String summary = null;
+        for (String label : labels) {
+            if (summary == null) {
+                summary = label;
+            } else {
+                summary = mContext.getString(R.string.join_many_items_middle, summary, label);
+            }
+        }
+        preference.setSummary(summary);
+    }
+}