Make inefficient weight detector identify more candidates

The inefficient weight detector looks for horizontal layouts with
weights where all the children are layouts. It didn't have a very good
heuristic for finding out whether all children are layouts; it just
looked for whether the tag name contains "Layout".

This changeset generalizes this a bit, adding other layouts, as well
as <fragment> tags to the lint check.

It also updates the Master/Detail template to set the baseline
alignment attribute to false (to avoid triggering the updated lint
check), as well as android:textIsSelectable to clear another recent
new lint rule.

Change-Id: I887962b5e29a9ad0c5b5c01970b0c66f884125d8

5 files changed, 110 insertions, 5 deletions

diff --git a/lint/libs/lint_api/src/com/android/tools/lint/client/api/DefaultSdkInfo.java b/lint/libs/lint_api/src/com/android/tools/lint/client/api/DefaultSdkInfo.java
index b5a1628..2f54659 100644
--- a/lint/libs/lint_api/src/com/android/tools/lint/client/api/DefaultSdkInfo.java
+++ b/lint/libs/lint_api/src/com/android/tools/lint/client/api/DefaultSdkInfo.java
@@ -65,9 +65,12 @@ import static com.android.SdkConstants.WIDGET_PKG_PREFIX;
 import com.android.annotations.NonNull;
 import com.android.annotations.Nullable;
 import com.google.common.annotations.Beta;
+import com.google.common.collect.Maps;
+import com.google.common.collect.Sets;
 
 import java.util.HashMap;
 import java.util.Map;
+import java.util.Set;
 
 /**
  * Default simple implementation of an {@link SdkInfo}
@@ -155,10 +158,23 @@ class DefaultSdkInfo extends SdkInfo {
         return type;
     }
 
+    @Override
+    public boolean isLayout(@NonNull String tag) {
+        // TODO: Read in widgets.txt from the platform install area to look up this information
+        // dynamically instead!
+
+        if (super.isLayout(tag)) {
+            return true;
+        }
+
+        return LAYOUTS.contains(tag);
+    }
+
     private static final int CLASS_COUNT = 59;
+    private static final int LAYOUT_COUNT = 20;
 
-    @NonNull
-    private static final Map<String, String> PARENTS = new HashMap<String, String>(CLASS_COUNT);
+    private static final Map<String,String> PARENTS = Maps.newHashMapWithExpectedSize(CLASS_COUNT);
+    private static final Set<String> LAYOUTS =  Sets.newHashSetWithExpectedSize(CLASS_COUNT);
 
     static {
         PARENTS.put(COMPOUND_BUTTON, BUTTON);
@@ -203,8 +219,8 @@ class DefaultSdkInfo extends SdkInfo {
         PARENTS.put(WEB_VIEW, ABSOLUTE_LAYOUT);
         PARENTS.put(AUTO_COMPLETE_TEXT_VIEW, EDIT_TEXT);
         PARENTS.put(MULTI_AUTO_COMPLETE_TEXT_VIEW, AUTO_COMPLETE_TEXT_VIEW);
+        PARENTS.put(CHECKED_TEXT_VIEW, TEXT_VIEW);
 
-        PARENTS.put("CheckedTextView", TEXT_VIEW);        //$NON-NLS-1$
         PARENTS.put("MediaController", FRAME_LAYOUT);     //$NON-NLS-1$
         PARENTS.put("SlidingDrawer", VIEW_GROUP);         //$NON-NLS-1$
         PARENTS.put("DialerFilter", RELATIVE_LAYOUT);     //$NON-NLS-1$
@@ -237,6 +253,28 @@ class DefaultSdkInfo extends SdkInfo {
             }
         }
         */
+
+        LAYOUTS.add(TAB_HOST);
+        LAYOUTS.add(HORIZONTAL_SCROLL_VIEW);
+        LAYOUTS.add(VIEW_SWITCHER);
+        LAYOUTS.add(TAB_WIDGET);
+        LAYOUTS.add(VIEW_ANIMATOR);
+        LAYOUTS.add(SCROLL_VIEW);
+        LAYOUTS.add(GRID_VIEW);
+        LAYOUTS.add(TABLE_ROW);
+        LAYOUTS.add(RADIO_GROUP);
+        LAYOUTS.add(LIST_VIEW);
+        LAYOUTS.add(EXPANDABLE_LIST_VIEW);
+        LAYOUTS.add("MediaController");        //$NON-NLS-1$
+        LAYOUTS.add("DialerFilter");           //$NON-NLS-1$
+        LAYOUTS.add("ViewFlipper");            //$NON-NLS-1$
+        LAYOUTS.add("SlidingDrawer");          //$NON-NLS-1$
+        LAYOUTS.add("StackView");              //$NON-NLS-1$
+        LAYOUTS.add("SearchView");             //$NON-NLS-1$
+        LAYOUTS.add("TextSwitcher");           //$NON-NLS-1$
+        LAYOUTS.add("AdapterViewFlipper");     //$NON-NLS-1$
+        LAYOUTS.add("ImageSwitcher");          //$NON-NLS-1$
+        assert LAYOUTS.size() <= LAYOUT_COUNT : LAYOUTS.size();
     }
 
     // Currently using a map; this should really be a list, but using a map until we actually
diff --git a/lint/libs/lint_api/src/com/android/tools/lint/client/api/SdkInfo.java b/lint/libs/lint_api/src/com/android/tools/lint/client/api/SdkInfo.java
index 5ff7f90..8b3d1e9 100644
--- a/lint/libs/lint_api/src/com/android/tools/lint/client/api/SdkInfo.java
+++ b/lint/libs/lint_api/src/com/android/tools/lint/client/api/SdkInfo.java
@@ -76,5 +76,15 @@ public abstract class SdkInfo {
     @Nullable
     public abstract String getParentViewName(@NonNull String name);
 
+    /**
+     * Returns true if the given widget name is a layout
+     *
+     * @param tag the XML tag for the view
+     * @return true if the given tag corresponds to a layout
+     */
+    public boolean isLayout(@NonNull String tag) {
+        return tag.endsWith("Layout"); //$NON-NLS-1$
+    }
+
     // TODO: Add access to resource resolution here.
 }
diff --git a/lint/libs/lint_checks/src/com/android/tools/lint/checks/InefficientWeightDetector.java b/lint/libs/lint_checks/src/com/android/tools/lint/checks/InefficientWeightDetector.java
index 9c92c4b..39009c6 100644
--- a/lint/libs/lint_checks/src/com/android/tools/lint/checks/InefficientWeightDetector.java
+++ b/lint/libs/lint_checks/src/com/android/tools/lint/checks/InefficientWeightDetector.java
@@ -23,11 +23,15 @@ import static com.android.SdkConstants.ATTR_LAYOUT_WEIGHT;
 import static com.android.SdkConstants.ATTR_LAYOUT_WIDTH;
 import static com.android.SdkConstants.ATTR_ORIENTATION;
 import static com.android.SdkConstants.LINEAR_LAYOUT;
+import static com.android.SdkConstants.RADIO_GROUP;
 import static com.android.SdkConstants.VALUE_VERTICAL;
 import static com.android.SdkConstants.VIEW;
+import static com.android.SdkConstants.VIEW_FRAGMENT;
+import static com.android.SdkConstants.VIEW_INCLUDE;
 import static com.android.SdkConstants.VIEW_TAG;
 
 import com.android.annotations.NonNull;
+import com.android.tools.lint.client.api.SdkInfo;
 import com.android.tools.lint.detector.api.Category;
 import com.android.tools.lint.detector.api.Issue;
 import com.android.tools.lint.detector.api.LayoutDetector;
@@ -170,9 +174,16 @@ public class InefficientWeightDetector extends LayoutDetector {
                 && !element.hasAttributeNS(ANDROID_URI, ATTR_BASELINE_ALIGNED)) {
             // See if all the children are layouts
             boolean allChildrenAreLayouts = children.size() > 0;
+            SdkInfo sdkInfo = context.getClient().getSdkInfo(context.getProject());
             for (Element child : children) {
-                // TODO: Make better check
-                if (!child.getTagName().endsWith("Layout")) { //$NON-NLS-1$
+                String tagName = child.getTagName();
+                if (!(sdkInfo.isLayout(tagName)
+                        // RadioGroup is a layout, but one which possibly should be base aligned
+                        && !tagName.equals(RADIO_GROUP)
+                        // Consider <fragment> tags as layouts for the purposes of this check
+                        || VIEW_FRAGMENT.equals(tagName)
+                        // Ditto for <include> tags
+                        || VIEW_INCLUDE.equals(tagName))) {
                     allChildrenAreLayouts = false;
                 }
             }
diff --git a/lint/libs/lint_checks/tests/src/com/android/tools/lint/checks/InefficientWeightDetectorTest.java b/lint/libs/lint_checks/tests/src/com/android/tools/lint/checks/InefficientWeightDetectorTest.java
index ad0da87..644bb10 100644
--- a/lint/libs/lint_checks/tests/src/com/android/tools/lint/checks/InefficientWeightDetectorTest.java
+++ b/lint/libs/lint_checks/tests/src/com/android/tools/lint/checks/InefficientWeightDetectorTest.java
@@ -58,6 +58,15 @@ public class InefficientWeightDetectorTest extends AbstractCheckTest {
             lintFiles("res/layout/baseline_weights.xml"));
     }
 
+    public void testWeights4() throws Exception {
+        assertEquals(
+            "res/layout/activity_item_two_pane.xml:1: Warning: Set android:baselineAligned=\"false\" on this element for better performance [DisableBaselineAlignment]\n" +
+            "<LinearLayout xmlns:android=\"http://schemas.android.com/apk/res/android\"\n" +
+            "^\n" +
+            "0 errors, 1 warnings\n",
+            lintFiles("res/layout/activity_item_two_pane.xml"));
+    }
+
     public void testNoVerticalWeights3() throws Exception {
         // Orientation=vertical
         assertEquals(
diff --git a/lint/libs/lint_checks/tests/src/com/android/tools/lint/checks/data/res/layout/activity_item_two_pane.xml b/lint/libs/lint_checks/tests/src/com/android/tools/lint/checks/data/res/layout/activity_item_two_pane.xml
new file mode 100644
index 0000000..b19047a
--- /dev/null
+++ b/lint/libs/lint_checks/tests/src/com/android/tools/lint/checks/data/res/layout/activity_item_two_pane.xml
@@ -0,0 +1,37 @@
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:layout_marginLeft="16dp"
+    android:layout_marginRight="16dp"
+    android:divider="?android:attr/dividerHorizontal"
+    android:orientation="horizontal"
+    android:showDividers="middle"
+    tools:context=".ItemListActivity" >
+
+    <!--
+    This layout is a two-pane layout for the Items
+    master/detail flow. See res/values-large/refs.xml and
+    res/values-sw600dp/refs.xml for an example of layout aliases
+    that replace the single-pane version of the layout with
+    this two-pane version.
+
+    For more on layout aliases, see:
+    http://developer.android.com/training/multiscreen/screensizes.html#TaskUseAliasFilters
+    -->
+
+    <fragment
+        android:id="@+id/item_list"
+        android:name="com.example.master.ItemListFragment"
+        android:layout_width="0dp"
+        android:layout_height="match_parent"
+        android:layout_weight="1"
+        tools:layout="@android:layout/list_content" />
+
+    <FrameLayout
+        android:id="@+id/item_detail_container"
+        android:layout_width="0dp"
+        android:layout_height="match_parent"
+        android:layout_weight="3" />
+
+</LinearLayout>