Add test and fix null keys in search providers.

- Add keys to some screens.
- Remove dynamic saved network/turst agent from search provider.
- Remove dynamic print services from printsettings.

Bug: 69384409
Test: atest
Change-Id: I62dce27d52585badb2a8953a05084e35dbae2f7d

src/com/android/settings/display/ScreenZoomSettings.java

@@ -22,6 +22,7 @@ import android.content.res.Configuration;
 import android.content.res.Resources;
 import android.os.Bundle;
 import android.view.Display;
+
 import com.android.internal.logging.nano.MetricsProto.MetricsEvent;
 import com.android.settings.PreviewSeekBarPreferenceFragment;
 import com.android.settings.R;
@@ -48,7 +49,7 @@ public class ScreenZoomSettings extends PreviewSeekBarPreferenceFragment impleme
         mActivityLayoutResId = R.layout.screen_zoom_activity;
 
         // This should be replaced once the final preview sample screen is in place.
-        mPreviewSampleResIds = new int[]{R.layout.screen_zoom_preview_1,
+        mPreviewSampleResIds = new int[] {R.layout.screen_zoom_preview_1,
                 R.layout.screen_zoom_preview_2,
                 R.layout.screen_zoom_preview_settings};
 
@@ -60,8 +61,8 @@ public class ScreenZoomSettings extends PreviewSeekBarPreferenceFragment impleme
             // connect to the window manager service. Just use the current
             // density and don't let the user change anything.
             final int densityDpi = getResources().getDisplayMetrics().densityDpi;
-            mValues = new int[] { densityDpi };
-            mEntries = new String[] { getString(DisplayDensityUtils.SUMMARY_DEFAULT) };
+            mValues = new int[] {densityDpi};
+            mEntries = new String[] {getString(DisplayDensityUtils.SUMMARY_DEFAULT)};
             mInitialIndex = 0;
             mDefaultDensity = densityDpi;
         } else {
@@ -109,10 +110,12 @@ public class ScreenZoomSettings extends PreviewSeekBarPreferenceFragment impleme
     public static final SearchIndexProvider SEARCH_INDEX_DATA_PROVIDER =
             new BaseSearchIndexProvider() {
                 @Override
-                public List<SearchIndexableRaw> getRawDataToIndex(Context context, boolean enabled) {
+                public List<SearchIndexableRaw> getRawDataToIndex(Context context,
+                        boolean enabled) {
                     final Resources res = context.getResources();
                     final SearchIndexableRaw data = new SearchIndexableRaw(context);
                     data.title = res.getString(R.string.screen_zoom_title);
+                    data.key = "screen_zoom_settings";
                     data.screenTitle = res.getString(R.string.screen_zoom_title);
                     data.keywords = res.getString(R.string.screen_zoom_keywords);