Restarting launcher when on font scale change

Chaning the font scale affects the static device profile and may
affect various background threads and static constants. Killing
the process ensures that these states get invalidated properly.

Bug: 26131935
Change-Id: Idc262ee5d158019e7a2505f8fb9a6413c06bfdeb

3 files changed, 58 insertions, 1 deletions

diff --git a/src/com/android/launcher3/DeviceProfile.java b/src/com/android/launcher3/DeviceProfile.java
index dd9c6e116..c6da5844a 100644
--- a/src/com/android/launcher3/DeviceProfile.java
+++ b/src/com/android/launcher3/DeviceProfile.java
@@ -203,7 +203,7 @@ public class DeviceProfile {
     private void updateIconSize(float scale, int drawablePadding, Resources res,
                                 DisplayMetrics dm) {
         iconSizePx = (int) (Utilities.pxFromDp(inv.iconSize, dm) * scale);
-        iconTextSizePx = (int) (Utilities.pxFromDp(inv.iconTextSize, dm) * scale);
+        iconTextSizePx = (int) (Utilities.pxFromSp(inv.iconTextSize, dm) * scale);
         iconDrawablePaddingPx = drawablePadding;
         hotseatIconSizePx = (int) (Utilities.pxFromDp(inv.hotseatIconSize, dm) * scale);
 
diff --git a/src/com/android/launcher3/LauncherAppState.java b/src/com/android/launcher3/LauncherAppState.java
index 34b838252..430d19342 100644
--- a/src/com/android/launcher3/LauncherAppState.java
+++ b/src/com/android/launcher3/LauncherAppState.java
@@ -27,6 +27,7 @@ import com.android.launcher3.accessibility.LauncherAccessibilityDelegate;
 import com.android.launcher3.compat.LauncherAppsCompat;
 import com.android.launcher3.compat.PackageInstallerCompat;
 import com.android.launcher3.compat.UserManagerCompat;
+import com.android.launcher3.util.ConfigMonitor;
 import com.android.launcher3.util.TestingUtils;
 import com.android.launcher3.util.Thunk;
 
@@ -104,6 +105,7 @@ public class LauncherAppState {
 
         sContext.registerReceiver(mModel, filter);
         UserManagerCompat.getInstance(sContext).enableAndResetCache();
+        new ConfigMonitor(sContext).register();
     }
 
     /**
diff --git a/src/com/android/launcher3/util/ConfigMonitor.java b/src/com/android/launcher3/util/ConfigMonitor.java
new file mode 100644
index 000000000..c61fa8859
--- /dev/null
+++ b/src/com/android/launcher3/util/ConfigMonitor.java
@@ -0,0 +1,55 @@
+package com.android.launcher3.util;
+
+/**
+ * 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.
+ */
+
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+import android.content.IntentFilter;
+import android.content.res.Configuration;
+import android.util.Log;
+
+/**
+ * {@link BroadcastReceiver} which watches configuration changes and
+ * restarts the process in case changes which affect the device profile.
+ */
+public class ConfigMonitor extends BroadcastReceiver {
+
+    private final Context mContext;
+    private final float mFontScale;
+
+    public ConfigMonitor(Context context) {
+        mContext = context;
+
+        Configuration config = context.getResources().getConfiguration();
+        mFontScale = config.fontScale;
+    }
+
+    @Override
+    public void onReceive(Context context, Intent intent) {
+        Configuration config = context.getResources().getConfiguration();
+        if (mFontScale != config.fontScale) {
+            Log.d("ConfigMonitor", "Configuration changed, restarting launcher");
+            mContext.unregisterReceiver(this);
+            android.os.Process.killProcess(android.os.Process.myPid());
+        }
+    }
+
+    public void register() {
+        mContext.registerReceiver(this, new IntentFilter(Intent.ACTION_CONFIGURATION_CHANGED));
+    }
+}