Add EventLog to report lock screen type

Bug: 9075747
Change-Id: I7d3667211e76b13ccd659713c35ca86246e31e0b

Android.mk

@@ -6,7 +6,9 @@ LOCAL_STATIC_JAVA_LIBRARIES := android-support-v4 android-support-v13 jsr305
 
 LOCAL_MODULE_TAGS := optional
 
-LOCAL_SRC_FILES := $(call all-java-files-under, src)
+LOCAL_SRC_FILES := \
+        $(call all-java-files-under, src) \
+        src/com/android/settings/EventLogTags.logtags
 
 LOCAL_PACKAGE_NAME := Settings
 LOCAL_CERTIFICATE := platform

src/com/android/settings/ChooseLockGeneric.java

@@ -28,6 +28,7 @@ import android.preference.Preference;
 import android.preference.PreferenceActivity;
 import android.preference.PreferenceScreen;
 import android.security.KeyStore;
+import android.util.EventLog;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -122,6 +123,9 @@ public class ChooseLockGeneric extends PreferenceActivity {
                 Preference preference) {
             final String key = preference.getKey();
             boolean handled = true;
+
+            EventLog.writeEvent(EventLogTags.LOCK_SCREEN_TYPE, key);
+
             if (KEY_UNLOCK_SET_OFF.equals(key)) {
                 updateUnlockMethodAndFinish(
                         DevicePolicyManager.PASSWORD_QUALITY_UNSPECIFIED, true);

src/com/android/settings/EventLogTags.logtags

@@ -0,0 +1,6 @@
+# See system/core/logcat/event.logtags for a description of the format of this file.
+
+option java_package com.android.settings
+
+# log the type of screen lock when user sets lock screen
+90200 lock_screen_type (type|3)