Runtime resource overlay, iteration 1.

Runtime resource overlay allows unmodified applications to appear
as if they had been compiled with additional resources defined. See
libs/utils/README for more information.

This commit is the first iteration of runtime resource overlay. It
provides the actual overlay modifications and loading of trusted overlay
packages (ie residing in /vendor) targeting framework-res.apk.

This commit loads exactly one overlay package. The overlay,
if present, must target framework-res.apk and be located at
/vendor/overlay/framework/framework-res.apk.

Change-Id: If26ee7754813004a96c043dba37fbe99fa3919db

5 files changed, 152 insertions, 0 deletions

diff --git a/core/tests/overlaytests/OverlayTest/Android.mk b/core/tests/overlaytests/OverlayTest/Android.mk
new file mode 100644
index 0000000..f7f67f6
--- /dev/null
+++ b/core/tests/overlaytests/OverlayTest/Android.mk
@@ -0,0 +1,10 @@
+LOCAL_PATH := $(call my-dir)
+include $(CLEAR_VARS)
+
+LOCAL_MODULE_TAGS := tests
+
+LOCAL_PACKAGE_NAME := OverlayTest
+
+LOCAL_SRC_FILES := $(call all-java-files-under, src)
+
+include $(BUILD_PACKAGE)
diff --git a/core/tests/overlaytests/OverlayTest/AndroidManifest.xml b/core/tests/overlaytests/OverlayTest/AndroidManifest.xml
new file mode 100644
index 0000000..9edba12
--- /dev/null
+++ b/core/tests/overlaytests/OverlayTest/AndroidManifest.xml
@@ -0,0 +1,10 @@
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.android.overlaytest">
+    <uses-permission android:name="android.permission.RUN_INSTRUMENTATION"/>
+    <application>
+        <uses-library android:name="android.test.runner"/>
+    </application>
+    <instrumentation android:name="android.test.InstrumentationTestRunner"
+        android:targetPackage="com.android.overlaytest"
+        android:label="Runtime resource overlay tests"/>
+</manifest>
diff --git a/core/tests/overlaytests/OverlayTest/src/com/android/overlaytest/OverlayBaseTest.java b/core/tests/overlaytests/OverlayTest/src/com/android/overlaytest/OverlayBaseTest.java
new file mode 100644
index 0000000..85b49ce
--- /dev/null
+++ b/core/tests/overlaytests/OverlayTest/src/com/android/overlaytest/OverlayBaseTest.java
@@ -0,0 +1,118 @@
+package com.android.overlaytest;
+
+import android.content.res.Configuration;
+import android.content.res.Resources;
+import android.test.AndroidTestCase;
+import java.io.InputStream;
+import java.util.Locale;
+
+public abstract class OverlayBaseTest extends AndroidTestCase {
+    private Resources mResources;
+    protected boolean mWithOverlay; // will be set by subclasses
+
+    protected void setUp() {
+        mResources = getContext().getResources();
+    }
+
+    private int calculateRawResourceChecksum(int resId) throws Throwable {
+        InputStream input = null;
+        try {
+            input = mResources.openRawResource(resId);
+            int ch, checksum = 0;
+            while ((ch = input.read()) != -1) {
+                checksum = (checksum + ch) % 0xffddbb00;
+            }
+            return checksum;
+        } finally {
+            input.close();
+        }
+    }
+
+    private void setLocale(String code) {
+        Locale locale = new Locale(code);
+        Locale.setDefault(locale);
+        Configuration config = new Configuration();
+        config.locale = locale;
+        mResources.updateConfiguration(config, mResources.getDisplayMetrics());
+    }
+
+    private void assertResource(int resId, boolean ewo, boolean ew) throws Throwable {
+        boolean expected = mWithOverlay ? ew : ewo;
+        boolean actual = mResources.getBoolean(resId);
+        assertEquals(expected, actual);
+    }
+
+    private void assertResource(int resId, String ewo, String ew) throws Throwable {
+        String expected = mWithOverlay ? ew : ewo;
+        String actual = mResources.getString(resId);
+        assertEquals(expected, actual);
+    }
+
+    private void assertResource(int resId, int[] ewo, int[] ew) throws Throwable {
+        int[] expected = mWithOverlay ? ew : ewo;
+        int[] actual = mResources.getIntArray(resId);
+        assertEquals("length:", expected.length, actual.length);
+        for (int i = 0; i < actual.length; ++i) {
+            assertEquals("index " + i + ":", actual[i], expected[i]);
+        }
+    }
+
+    public void testBooleanOverlay() throws Throwable {
+        // config_automatic_brightness_available has overlay (default config)
+        final int resId = com.android.internal.R.bool.config_automatic_brightness_available;
+        assertResource(resId, false, true);
+    }
+
+    public void testBoolean() throws Throwable {
+        // config_bypass_keyguard_if_slider_open has no overlay
+        final int resId = com.android.internal.R.bool.config_bypass_keyguard_if_slider_open;
+        assertResource(resId, true, true);
+    }
+
+    public void testStringOverlay() throws Throwable {
+        // phoneTypeCar has an overlay (default config), which shouldn't shadow
+        // the Swedish translation
+        final int resId = com.android.internal.R.string.phoneTypeCar;
+        setLocale("sv_SE");
+        assertResource(resId, "Bil", "Bil");
+    }
+
+    public void testStringSwedishOverlay() throws Throwable {
+        // phoneTypeWork has overlay (no default config, only for lang=sv)
+        final int resId = com.android.internal.R.string.phoneTypeWork;
+        setLocale("en_US");
+        assertResource(resId, "Work", "Work");
+        setLocale("sv_SE");
+        assertResource(resId, "Arbete", "Jobb");
+    }
+
+    public void testString() throws Throwable {
+        // phoneTypeHome has no overlay
+        final int resId = com.android.internal.R.string.phoneTypeHome;
+        setLocale("en_US");
+        assertResource(resId, "Home", "Home");
+        setLocale("sv_SE");
+        assertResource(resId, "Hem", "Hem");
+    }
+
+    public void testIntegerArrayOverlay() throws Throwable {
+        // config_scrollBarrierVibePattern has overlay (default config)
+        final int resId = com.android.internal.R.array.config_scrollBarrierVibePattern;
+        assertResource(resId, new int[]{0, 15, 10, 10}, new int[]{100, 200, 300});
+    }
+
+    public void testIntegerArray() throws Throwable {
+        // config_virtualKeyVibePattern has no overlay
+        final int resId = com.android.internal.R.array.config_virtualKeyVibePattern;
+        final int[] expected = {0, 10, 20, 30};
+        assertResource(resId, expected, expected);
+    }
+
+    public void testAsset() throws Throwable {
+        // drawable/default_background.jpg has overlay (default config)
+        final int resId = com.android.internal.R.drawable.default_wallpaper;
+        int actual = calculateRawResourceChecksum(resId);
+        int expected = mWithOverlay ? 0x000051da : 0x0014ebce;
+        assertEquals(expected, actual);
+    }
+}
diff --git a/core/tests/overlaytests/OverlayTest/src/com/android/overlaytest/WithOverlayTest.java b/core/tests/overlaytests/OverlayTest/src/com/android/overlaytest/WithOverlayTest.java
new file mode 100644
index 0000000..1292d03
--- /dev/null
+++ b/core/tests/overlaytests/OverlayTest/src/com/android/overlaytest/WithOverlayTest.java
@@ -0,0 +1,7 @@
+package com.android.overlaytest;
+
+public class WithOverlayTest extends OverlayBaseTest {
+    public WithOverlayTest() {
+        mWithOverlay = true;
+    }
+}
diff --git a/core/tests/overlaytests/OverlayTest/src/com/android/overlaytest/WithoutOverlayTest.java b/core/tests/overlaytests/OverlayTest/src/com/android/overlaytest/WithoutOverlayTest.java
new file mode 100644
index 0000000..630ff8f
--- /dev/null
+++ b/core/tests/overlaytests/OverlayTest/src/com/android/overlaytest/WithoutOverlayTest.java
@@ -0,0 +1,7 @@
+package com.android.overlaytest;
+
+public class WithoutOverlayTest extends OverlayBaseTest {
+    public WithoutOverlayTest() {
+        mWithOverlay = false;
+    }
+}