Move default app preferences to one screen

- Move emergency and SMS app preferences to default apps
 - Fix search on default apps
 - Make all default app prefs use AppListPreference
 - Some approximate UI work on AppListPreference

Bug: 20210110
Change-Id: Id04086163c7e87c92a03af421a27018fb380b45d

src/com/android/settings/applications/DefaultSmsPreference.java

@@ -0,0 +1,75 @@
+/*
+ * Copyright (C) 2015 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.applications;
+
+import android.content.ComponentName;
+import android.content.Context;
+import android.telephony.TelephonyManager;
+import android.text.TextUtils;
+import android.util.AttributeSet;
+
+import com.android.internal.telephony.SmsApplication;
+import com.android.internal.telephony.SmsApplication.SmsApplicationData;
+import com.android.settings.AppListPreference;
+
+import java.util.Collection;
+import java.util.Objects;
+
+public class DefaultSmsPreference extends AppListPreference {
+
+    public DefaultSmsPreference(Context context, AttributeSet attrs) {
+        super(context, attrs);
+
+        loadSmsApps();
+    }
+
+    private void loadSmsApps() {
+        Collection<SmsApplicationData> smsApplications =
+                SmsApplication.getApplicationCollection(getContext());
+
+        int count = smsApplications.size();
+        String[] packageNames = new String[count];
+        int i = 0;
+        for (SmsApplicationData smsApplicationData : smsApplications) {
+            packageNames[i++] = smsApplicationData.mPackageName;
+        }
+        setPackageNames(packageNames, getDefaultPackage());
+    }
+
+    private String getDefaultPackage() {
+        ComponentName appName = SmsApplication.getDefaultSmsApplication(getContext(), true);
+        if (appName != null) {
+            return appName.getPackageName();
+        }
+        return null;
+    }
+
+    @Override
+    protected boolean persistString(String value) {
+        if (!TextUtils.isEmpty(value) && !Objects.equals(value, getDefaultPackage())) {
+            SmsApplication.setDefaultApplication(value, getContext());
+        }
+        setSummary(getEntry());
+        return true;
+    }
+
+    public static boolean isAvailable(Context context) {
+        TelephonyManager tm =
+                (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);
+        return tm.isSmsCapable();
+    }
+
+}