[layout precompilation] Add testing hook for precompiled layouts

We want to be able to control at a fine grained level whether precompiled
layouts are enabled so we can compare inflation results with and without. This
changes adds a @TestApi method that supports this.

Bug: 111895153
Merged-In: Ib6b62d79a9ca7aefefff8639752aa5838e491038
Change-Id: I2f28f6912499825e52c17cc163be9c0fe93855cb

2 files changed, 22 insertions, 2 deletions

diff --git a/api/test-current.txt b/api/test-current.txt
index af455fb4abb6..30c6fdf55cbe 100644
--- a/api/test-current.txt
+++ b/api/test-current.txt
@@ -1790,6 +1790,10 @@ package android.view {
     method public boolean isSystemGroup();
   }
 
+  public abstract class LayoutInflater {
+    method public void setPrecompiledLayoutsEnabledForTesting(boolean);
+  }
+
   public final class MotionEvent extends android.view.InputEvent implements android.os.Parcelable {
     method public void setActionButton(int);
     method public void setButtonState(int);
diff --git a/core/java/android/view/LayoutInflater.java b/core/java/android/view/LayoutInflater.java
index f2259b045c0a..2ee72bffc9ec 100644
--- a/core/java/android/view/LayoutInflater.java
+++ b/core/java/android/view/LayoutInflater.java
@@ -20,6 +20,7 @@ import android.annotation.LayoutRes;
 import android.annotation.NonNull;
 import android.annotation.Nullable;
 import android.annotation.SystemService;
+import android.annotation.TestApi;
 import android.annotation.UnsupportedAppUsage;
 import android.content.Context;
 import android.content.res.Resources;
@@ -389,9 +390,13 @@ public abstract class LayoutInflater {
     }
 
     private void initPrecompiledViews() {
+        initPrecompiledViews(
+                SystemProperties.getBoolean(USE_PRECOMPILED_LAYOUT_SYSTEM_PROPERTY, false));
+    }
+
+    private void initPrecompiledViews(boolean enablePrecompiledViews) {
+        mUseCompiledView = enablePrecompiledViews;
         try {
-            mUseCompiledView =
-                SystemProperties.getBoolean(USE_PRECOMPILED_LAYOUT_SYSTEM_PROPERTY, false);
             if (mUseCompiledView) {
                 mPrecompiledClassLoader = mContext.getClassLoader();
                 String dexFile = mContext.getCodeCacheDir() + COMPILED_VIEW_DEX_FILE_NAME;
@@ -409,6 +414,17 @@ public abstract class LayoutInflater {
             }
             mUseCompiledView = false;
         }
+        if (!mUseCompiledView) {
+            mPrecompiledClassLoader = null;
+        }
+    }
+
+    /**
+     * @hide for use by CTS tests
+     */
+    @TestApi
+    public void setPrecompiledLayoutsEnabledForTesting(boolean enablePrecompiledLayouts) {
+        initPrecompiledViews(enablePrecompiledLayouts);
     }
 
     /**