Allow Magnification Settings launch from outside of AccessibilitySettings

Before this CL, Magnification Settings can only be
launched from MagnificationPreferenceController.

This CL initializes FooterPreferenceController if the
parent class does not initialize it from Intent extras.

Bug: 268411305
Test: manual
      make RunSettingsRoboTests ROBOTEST_FILTER=MagnificationGesturesPreferenceControllerTest
      make RunSettingsRoboTests ROBOTEST_FILTER=ToggleScreenMagnificationPreferenceFragmentTest
Change-Id: I954739c39c823ce7fe0daa711743f729d182571b

src/com/android/settings/accessibility/MagnificationGesturesPreferenceController.java

@@ -14,7 +14,6 @@
 package com.android.settings.accessibility;
 
 import android.content.Context;
-import android.icu.text.MessageFormat;
 import android.os.Bundle;
 import android.provider.Settings;
 import android.text.TextUtils;
@@ -94,19 +93,11 @@ public class MagnificationGesturesPreferenceController extends TogglePreferenceC
     }
 
     static void populateMagnificationGesturesPreferenceExtras(Bundle extras, Context context) {
-        extras.putString(AccessibilitySettings.EXTRA_PREFERENCE_KEY,
+        // TODO(b/270481978): It seems not necessary to put EXTRA_TITLE_RES.
-                Settings.Secure.ACCESSIBILITY_DISPLAY_MAGNIFICATION_ENABLED);
         extras.putInt(AccessibilitySettings.EXTRA_TITLE_RES,
                 R.string.accessibility_screen_magnification_gestures_title);
 
-        String intro = context.getString(R.string.accessibility_screen_magnification_intro_text);
+        // TODO(b/270481978): It seems not necessary to put EXTRA_VIDEO_RAW_RESOURCE_ID.
-        extras.putCharSequence(AccessibilitySettings.EXTRA_INTRO, intro);
-
-        String summary = context.getString(R.string.accessibility_screen_magnification_summary);
-        final Object[] numberArguments = {1, 2, 3, 4, 5};
-        summary = MessageFormat.format(summary, numberArguments);
-        extras.putCharSequence(AccessibilitySettings.EXTRA_HTML_DESCRIPTION, summary);
-
         extras.putInt(AccessibilitySettings.EXTRA_VIDEO_RAW_RESOURCE_ID,
                 R.raw.accessibility_screen_magnification);
     }

src/com/android/settings/accessibility/ToggleFeaturePreferenceFragment.java

@@ -122,7 +122,7 @@ public abstract class ToggleFeaturePreferenceFragment extends DashboardFragment
     private int mNeedsQSTooltipType = QuickSettingsTooltipType.GUIDE_TO_EDIT;
     private boolean mSavedAccessibilityFloatingMenuEnabled;
     private ImageView mImageGetterCacheView;
-    private final Html.ImageGetter mImageGetter = (String str) -> {
+    protected final Html.ImageGetter mImageGetter = (String str) -> {
         if (str != null && str.startsWith(IMG_PREFIX)) {
             final String fileName = str.substring(IMG_PREFIX.length());
             return getDrawableFromUri(Uri.parse(

src/com/android/settings/accessibility/ToggleScreenMagnificationPreferenceFragment.java

@@ -29,6 +29,7 @@ import android.content.Context;
 import android.content.DialogInterface;
 import android.content.pm.PackageManager;
 import android.icu.text.CaseMap;
+import android.icu.text.MessageFormat;
 import android.net.Uri;
 import android.os.Bundle;
 import android.provider.DeviceConfig;
@@ -220,6 +221,34 @@ public class ToggleScreenMagnificationPreferenceFragment extends
         addJoystickSetting(generalCategory);
     }
 
+    @Override
+    protected void onProcessArguments(Bundle arguments) {
+        Context context = getContext();
+
+        // This Fragment may get arguments from MagnificationGesturesPreferenceController or
+        // MagnificationNavbarPreferenceController and it's necessary to check if a key exists
+        // before putting a new value into arguments.
+
+        if (!arguments.containsKey(AccessibilitySettings.EXTRA_PREFERENCE_KEY)) {
+            arguments.putString(AccessibilitySettings.EXTRA_PREFERENCE_KEY,
+                    Settings.Secure.ACCESSIBILITY_DISPLAY_MAGNIFICATION_ENABLED);
+        }
+
+        if (!arguments.containsKey(AccessibilitySettings.EXTRA_INTRO)) {
+            arguments.putCharSequence(AccessibilitySettings.EXTRA_INTRO,
+                    context.getString(R.string.accessibility_screen_magnification_intro_text));
+        }
+
+        if (!arguments.containsKey(AccessibilitySettings.EXTRA_HTML_DESCRIPTION)) {
+            String summary = MessageFormat.format(
+                    context.getString(R.string.accessibility_screen_magnification_summary),
+                            new Object[]{1, 2, 3, 4, 5});
+            arguments.putCharSequence(AccessibilitySettings.EXTRA_HTML_DESCRIPTION, summary);
+        }
+
+        super.onProcessArguments(arguments);
+    }
+
     private void addAlwaysOnSetting(PreferenceCategory generalCategory) {
         if (!DeviceConfig.getBoolean(
                 DeviceConfig.NAMESPACE_WINDOW_MANAGER,

tests/robotests/src/com/android/settings/accessibility/ToggleScreenMagnificationPreferenceFragmentTest.java

@@ -23,6 +23,7 @@ import static com.android.settings.accessibility.ToggleFeaturePreferenceFragment
 
 import static com.google.common.truth.Truth.assertThat;
 
+import static org.junit.Assert.assertTrue;
 import static org.mockito.ArgumentMatchers.any;
 import static org.mockito.ArgumentMatchers.anyInt;
 import static org.mockito.ArgumentMatchers.eq;
@@ -405,6 +406,17 @@ public class ToggleScreenMagnificationPreferenceFragmentTest {
         assertThat(mFragment.getHelpResource()).isEqualTo(R.string.help_url_magnification);
     }
 
+    @Test
+    public void onProcessArguments_defaultArgumentUnavailable_shouldSetDefaultArguments() {
+        Bundle arguments = new Bundle();
+
+        mFragment.onProcessArguments(arguments);
+
+        assertTrue(arguments.containsKey(AccessibilitySettings.EXTRA_PREFERENCE_KEY));
+        assertTrue(arguments.containsKey(AccessibilitySettings.EXTRA_INTRO));
+        assertTrue(arguments.containsKey(AccessibilitySettings.EXTRA_HTML_DESCRIPTION));
+    }
+
     private void putStringIntoSettings(String key, String componentName) {
         Settings.Secure.putString(mContext.getContentResolver(), key, componentName);
     }