Change display size preview for app icons.

The new UI intentionally does not look like the app drawer from
launcher so user is clear this is a preview screen.

Change-Id: Iba87fab72e77921c1f1014fca24476bd4af2d19c
Fixes: 70043399
Test: visual

res/layout/screen_zoom_preview_2.xml

@@ -17,4 +17,7 @@
     xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
+    android:padding="32dp"
+    android:numColumns="3"
+    android:gravity="center"
     android:importantForAccessibility="noHideDescendants" />

res/layout/screen_zoom_preview_app_icon.xml

@@ -14,18 +14,14 @@
      limitations under the License.
 -->
 
-<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
-             android:layout_width="match_parent"
-             android:layout_height="wrap_content"
-             android:importantForAccessibility="noHideDescendants">
-
 <LinearLayout
-        android:layout_width="@dimen/screen_zoom_preview_app_icon_width"
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="wrap_content"
     android:layout_height="wrap_content"
     android:layout_gravity="center_horizontal|top"
     android:gravity="center_horizontal"
     android:orientation="vertical"
-        android:padding="8dp">
+    android:paddingTop="8dp">
 
     <ImageView
         android:id="@android:id/icon1"
@@ -43,4 +39,3 @@
         android:singleLine="true"
         android:textAppearance="@android:style/TextAppearance.Material.Caption" />
 </LinearLayout>
-</FrameLayout>

res/values/dimens.xml

@@ -251,7 +251,6 @@
     <dimen name="unmount_button_padding">8dp</dimen>
 
     <!-- Display, Screen zoom -->
-    <dimen name="screen_zoom_preview_app_icon_width">88dp</dimen>
     <dimen name="conversation_message_list_padding">10dp</dimen>
     <dimen name="conversation_message_contact_icon_text_size">32sp</dimen>
     <dimen name="conversation_message_text_size">16sp</dimen>

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

@@ -22,7 +22,6 @@ import android.content.pm.PackageManager;
 import android.content.pm.ResolveInfo;
 import android.graphics.drawable.Drawable;
 import android.os.UserHandle;
-import androidx.annotation.VisibleForTesting;
 import android.util.AttributeSet;
 import android.util.IconDrawableFactory;
 import android.view.View;
@@ -37,28 +36,32 @@ import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
 
+import androidx.annotation.VisibleForTesting;
+
 public class AppGridView extends GridView {
     public AppGridView(Context context) {
-        this(context, null);
+        super(context);
+        init(context);
     }
 
     public AppGridView(Context context, AttributeSet attrs) {
-        this(context, attrs, 0);
+        super(context, attrs);
+        init(context);
     }
 
     public AppGridView(Context context, AttributeSet attrs, int defStyleAttr) {
-        this(context, attrs, defStyleAttr, 0);
+        super(context, attrs, defStyleAttr);
+        init(context);
     }
 
     public AppGridView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleResId) {
         super(context, attrs, defStyleAttr, defStyleResId);
 
-        setNumColumns(AUTO_FIT);
+        init(context);
 
-        final int columnWidth = getResources().getDimensionPixelSize(
-                R.dimen.screen_zoom_preview_app_icon_width);
-        setColumnWidth(columnWidth);
+    }
 
+    private void init(Context context) {
         setAdapter(new AppsAdapter(context, R.layout.screen_zoom_preview_app_icon,
                 android.R.id.text1, android.R.id.icon1));
     }
@@ -105,6 +108,7 @@ public class AppGridView extends GridView {
         }
 
         private void loadAllApps() {
+            final int needAppCount = 6;
             final Intent mainIntent = new Intent(Intent.ACTION_MAIN, null);
             mainIntent.addCategory(Intent.CATEGORY_LAUNCHER);
 
@@ -117,6 +121,9 @@ public class AppGridView extends GridView {
                 if (label != null) {
                     results.add(new ActivityEntry(info, label.toString(), iconFactory));
                 }
+                if (results.size() >= needAppCount) {
+                    break;
+                }
             }
 
             Collections.sort(results);