Add API to create new contexts with custom configurations.

This allows you to, say, make a Context whose configuration
is set to a different density than the actual density of the device.

The main API is Context.createConfigurationContext().  There is
also a new API on ContextThemeWrapper that allows you to apply
an override context before its resources are retrieved, which
addresses some feature requests from developers to be able to
customize the context their app is running in.

Change-Id: I88364986660088521e24b567e2fda22fb7042819

1 files changed, 14 insertions, 8 deletions

diff --git a/core/java/android/app/ContextImpl.java b/core/java/android/app/ContextImpl.java
index 4496ce8..1ef14eb 100644
--- a/core/java/android/app/ContextImpl.java
+++ b/core/java/android/app/ContextImpl.java
@@ -37,6 +37,7 @@ import android.content.pm.IPackageManager;
 import android.content.pm.PackageManager;
 import android.content.res.AssetManager;
 import android.content.res.CompatibilityInfo;
+import android.content.res.Configuration;
 import android.content.res.Resources;
 import android.database.DatabaseErrorHandler;
 import android.database.sqlite.SQLiteDatabase;
@@ -525,7 +526,7 @@ class ContextImpl extends Context {
 
     @Override
     public AssetManager getAssets() {
-        return mResources.getAssets();
+        return getResources().getAssets();
     }
 
     @Override
@@ -1591,6 +1592,16 @@ class ContextImpl extends Context {
     }
 
     @Override
+    public Context createConfigurationContext(Configuration overrideConfiguration) {
+        ContextImpl c = new ContextImpl();
+        c.init(mPackageInfo, null, mMainThread);
+        c.mResources = mMainThread.getTopLevelResources(
+                mPackageInfo.getResDir(), overrideConfiguration,
+                mResources.getCompatibilityInfo());
+        return c;
+    }
+
+    @Override
     public boolean isRestricted() {
         return mRestricted;
     }
@@ -1659,12 +1670,11 @@ class ContextImpl extends Context {
                         " compatiblity info:" + container.getDisplayMetrics());
             }
             mResources = mainThread.getTopLevelResources(
-                    mPackageInfo.getResDir(), container.getCompatibilityInfo());
+                    mPackageInfo.getResDir(), null, container.getCompatibilityInfo());
         }
         mMainThread = mainThread;
         mContentResolver = new ApplicationContentResolver(this, mainThread);
-
-        setActivityToken(activityToken);
+        mActivityToken = activityToken;
     }
 
     final void init(Resources resources, ActivityThread mainThread) {
@@ -1691,10 +1701,6 @@ class ContextImpl extends Context {
         return mReceiverRestrictedContext = new ReceiverRestrictedContext(getOuterContext());
     }
 
-    final void setActivityToken(IBinder token) {
-        mActivityToken = token;
-    }
-
     final void setOuterContext(Context context) {
         mOuterContext = context;
     }