(DO NOT MERGE) Refactor InputMethodAndSubtypeEnabler to separate loops

Change-Id: I1b7d26c37293e03dc20f87d60eb146017a574c47
(cherry picked from commit 61d97ddda8)

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

@@ -51,7 +51,6 @@ public class InputMethodAndSubtypeEnabler extends SettingsPreferenceFragment {
     private InputMethodManager mImm;
     // TODO: Change mInputMethodInfoList to Map
     private List<InputMethodInfo> mInputMethodInfoList;
-    private String mInputMethodId;
     private Collator mCollator;
     private AlertDialog mDialog = null;
 
@@ -66,12 +65,22 @@ public class InputMethodAndSubtypeEnabler extends SettingsPreferenceFragment {
         // single Activity (see InputMethodAndSubtypeEnablerActivity). It should be available
         // from a preference argument when the preference is launched as a part of the other
         // Activity (like a right pane of 2-pane Settings app)
-        mInputMethodId = getStringExtraFromIntentOrArguments(
+        final String targetImi = getStringExtraFromIntentOrArguments(
                 android.provider.Settings.EXTRA_INPUT_METHOD_ID);
 
         mInputMethodInfoList = mImm.getInputMethodList();
         mCollator = Collator.getInstance();
-        setPreferenceScreen(createPreferenceHierarchy());
+
+        final PreferenceScreen root = getPreferenceManager().createPreferenceScreen(getActivity());
+        final int imiCount = mInputMethodInfoList.size();
+        for (int index = 0; index < imiCount; ++index) {
+            final InputMethodInfo imi = mInputMethodInfoList.get(index);
+            // Add subtype preferences of this IME when it is specified or no IME is specified.
+            if (imi.getId().equals(targetImi) || TextUtils.isEmpty(targetImi)) {
+                addInputMethodSubtypePreferences(imi, root);
+            }
+        }
+        setPreferenceScreen(root);
     }
 
     private String getStringExtraFromIntentOrArguments(final String name) {
@@ -114,74 +123,78 @@ public class InputMethodAndSubtypeEnabler extends SettingsPreferenceFragment {
                 mInputMethodInfoList, mHaveHardKeyboard);
     }
 
+    // TODO: Stop overriding this method. Instead start using {@link OnPreferenceChangedListener}.
     @Override
     public boolean onPreferenceTreeClick(final PreferenceScreen preferenceScreen,
             final Preference preference) {
-
+        if (!(preference instanceof CheckBoxPreference)) {
-        if (preference instanceof CheckBoxPreference) {
+            return super.onPreferenceTreeClick(preferenceScreen, preference);
+        }
         final CheckBoxPreference chkPref = (CheckBoxPreference) preference;
 
         for (final String imiId : mAutoSelectionPrefsMap.keySet()) {
             if (mAutoSelectionPrefsMap.get(imiId) == chkPref) {
-                    // We look for the first preference item in subtype enabler.
+                // We look for the first preference item in subtype enabler. The first item is used
-                    // The first item is used for turning on/off subtype auto selection.
+                // for turning on/off subtype auto selection. We are in the subtype enabler and
-                    // We are in the subtype enabler and trying selecting subtypes automatically.
+                // trying selecting subtypes automatically.
                 setAutoSelectionSubtypesEnabled(imiId, chkPref.isChecked());
                 return super.onPreferenceTreeClick(preferenceScreen, preference);
             }
         }
 
         final String id = chkPref.getKey();
-            if (chkPref.isChecked()) {
+        // Turns off a subtype.
+        if (!chkPref.isChecked()) {
+            // TODO: Because no preference on this screen has {@link InputMethodInfo} id as a key,
+            // the following setSubtypesPreferenceEnabled call is effectively no-operation and
+            // can be removed.
+            InputMethodAndSubtypeUtil.setSubtypesPreferenceEnabled(
+                    this, mInputMethodInfoList, id, false);
+            updateAutoSelectionPreferences();
+            return super.onPreferenceTreeClick(preferenceScreen, preference);
+        }
+
+        // Turns on a subtype.
         final InputMethodInfo imi = getInputMethodInfoById(id);
+        // TODO: Because no preference on this screen has {@link InputMethodInfo} id as a key,
+        // <code>imi</code> is always null and the following code can be removed.
         if (imi == null) {
             return super.onPreferenceTreeClick(preferenceScreen, preference);
         }
+        // Turns on a system IME's subtype.
         if (InputMethodUtils.isSystemIme(imi)) {
             InputMethodAndSubtypeUtil.setSubtypesPreferenceEnabled(
                     this, mInputMethodInfoList, id, true);
             // This is a built-in IME, so no need to warn.
             return super.onPreferenceTreeClick(preferenceScreen, preference);
         }
+        // Turns on a 3rd party IME's subtype.
+        // Turns off a subtype before showing a security warning dialog.
         chkPref.setChecked(false);
-                if (mDialog == null) {
+        if (mDialog != null && mDialog.isShowing()) {
-                    mDialog = (new AlertDialog.Builder(getActivity()))
-                            .setTitle(android.R.string.dialog_alert_title)
-                            .setCancelable(true)
-                            .setPositiveButton(android.R.string.ok,
-                                    new DialogInterface.OnClickListener() {
-                                        @Override
-                                        public void onClick(DialogInterface dialog, int which) {
-                                            chkPref.setChecked(true);
-                                            InputMethodAndSubtypeUtil.setSubtypesPreferenceEnabled(
-                                                    InputMethodAndSubtypeEnabler.this,
-                                                    mInputMethodInfoList, id, true);
-                                        }
-
-                            })
-                            .setNegativeButton(android.R.string.cancel,
-                                    new DialogInterface.OnClickListener() {
-                                        @Override
-                                        public void onClick(DialogInterface dialog, int which) {
-                                        }
-
-                            })
-                            .create();
-                } else {
-                    if (mDialog.isShowing()) {
             mDialog.dismiss();
         }
-                }
+        final AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
-                mDialog.setMessage(getResources().getString(
+        builder.setCancelable(true);
-                        R.string.ime_security_warning,
+        builder.setTitle(android.R.string.dialog_alert_title);
-                        imi.getServiceInfo().applicationInfo.loadLabel(getPackageManager())));
+        final CharSequence label = imi.getServiceInfo().applicationInfo
-                mDialog.show();
+                .loadLabel(getPackageManager());
-            } else {
+        builder.setMessage(getString(R.string.ime_security_warning, label));
+        builder.setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
+            @Override
+            public void onClick(final DialogInterface dialog, final int which) {
+                // The user explicitly enable the subtype.
+                chkPref.setChecked(true);
                 InputMethodAndSubtypeUtil.setSubtypesPreferenceEnabled(
-                        this, mInputMethodInfoList, id, false);
+                        InputMethodAndSubtypeEnabler.this, mInputMethodInfoList, id, true);
-                updateAutoSelectionPreferences();
-            }
             }
+        });
+        builder.setNegativeButton(android.R.string.cancel, new DialogInterface.OnClickListener() {
+            @Override
+            public void onClick(final DialogInterface dialog, final int which) {}
+        });
+        mDialog = builder.create();
+        mDialog.show();
         return super.onPreferenceTreeClick(preferenceScreen, preference);
     }
 
@@ -205,24 +218,14 @@ public class InputMethodAndSubtypeEnabler extends SettingsPreferenceFragment {
         }
     }
 
-    private PreferenceScreen createPreferenceHierarchy() {
+    private void addInputMethodSubtypePreferences(final InputMethodInfo imi,
-        // Root
+            final PreferenceScreen root) {
-        final PreferenceScreen root = getPreferenceManager().createPreferenceScreen(getActivity());
         final Context context = getActivity();
-
-        final int imiCount = (mInputMethodInfoList == null ? 0 : mInputMethodInfoList.size());
-        for (int imiIndex = 0; imiIndex < imiCount; ++imiIndex) {
-            final InputMethodInfo imi = mInputMethodInfoList.get(imiIndex);
         final int subtypeCount = imi.getSubtypeCount();
         if (subtypeCount <= 1) {
-                continue;
+            return;
         }
         final String imiId = imi.getId();
-            // Add this subtype to the list when no IME is specified or when the IME of this
-            // subtype is the specified IME.
-            if (!TextUtils.isEmpty(mInputMethodId) && !mInputMethodId.equals(imiId)) {
-                continue;
-            }
         final PreferenceCategory keyboardSettingsCategory = new PreferenceCategory(context);
         root.addPreference(keyboardSettingsCategory);
         final PackageManager pm = getPackageManager();
@@ -245,8 +248,8 @@ public class InputMethodAndSubtypeEnabler extends SettingsPreferenceFragment {
             final InputMethodSubtype subtype = imi.getSubtypeAt(index);
             if (subtype.overridesImplicitlyEnabledSubtype()) {
                 if (autoSubtypeLabel == null) {
-                        autoSubtypeLabel = subtype.getDisplayName(context,
+                    autoSubtypeLabel = subtype.getDisplayName(
-                                imi.getPackageName(), imi.getServiceInfo().applicationInfo);
+                            context, imi.getPackageName(), imi.getServiceInfo().applicationInfo);
                 }
             } else {
                 final Preference subtypePref = new InputMethodSubtypePreference(
@@ -276,8 +279,6 @@ public class InputMethodAndSubtypeEnabler extends SettingsPreferenceFragment {
             autoSelectionPref.setTitle(autoSubtypeLabel);
         }
     }
-        return root;
-    }
 
     private boolean isNoSubtypesExplicitlySelected(final String imiId) {
         final List<Preference> subtypePrefs = mInputMethodAndSubtypePrefsMap.get(imiId);
@@ -319,20 +320,25 @@ public class InputMethodAndSubtypeEnabler extends SettingsPreferenceFragment {
         // When targetImiId is null, apply to all subtypes of all IMEs
         for (final InputMethodInfo imi : mInputMethodInfoList) {
             final String imiId = imi.getId();
-            if (targetImiId != null && !targetImiId.equals(imiId)) {
-                continue;
-            }
             final CheckBoxPreference autoSelectionPref = mAutoSelectionPrefsMap.get(imiId);
             // No need to update implicitly enabled subtypes when the user has unchecked the
             // "subtype auto selection".
             if (autoSelectionPref == null || !autoSelectionPref.isChecked()) {
                 continue;
             }
+            if (imiId.equals(targetImiId) || targetImiId == null) {
+                updateImplicitlyEnabledSubtypesOf(imi, check);
+            }
+        }
+    }
+
+    private void updateImplicitlyEnabledSubtypesOf(final InputMethodInfo imi, final boolean check) {
+        final String imiId = imi.getId();
         final List<Preference> subtypePrefs = mInputMethodAndSubtypePrefsMap.get(imiId);
         final List<InputMethodSubtype> implicitlyEnabledSubtypes =
                 mImm.getEnabledInputMethodSubtypeList(imi, true);
         if (subtypePrefs == null || implicitlyEnabledSubtypes == null) {
-                continue;
+            return;
         }
         for (final Preference pref : subtypePrefs) {
             if (!(pref instanceof CheckBoxPreference)) {
@@ -342,7 +348,7 @@ public class InputMethodAndSubtypeEnabler extends SettingsPreferenceFragment {
             subtypePref.setChecked(false);
             if (check) {
                 for (final InputMethodSubtype subtype : implicitlyEnabledSubtypes) {
-                        String implicitlyEnabledSubtypePrefKey = imiId + subtype.hashCode();
+                    final String implicitlyEnabledSubtypePrefKey = imiId + subtype.hashCode();
                     if (subtypePref.getKey().equals(implicitlyEnabledSubtypePrefKey)) {
                         subtypePref.setChecked(true);
                         break;
@@ -351,7 +357,6 @@ public class InputMethodAndSubtypeEnabler extends SettingsPreferenceFragment {
             }
         }
     }
-    }
 
     private void updateAutoSelectionPreferences() {
         for (final String imiId : mInputMethodAndSubtypePrefsMap.keySet()) {