Fixes #1963229. Introduces Context#isRestricted().

A restricted Context is a special type of Context that prevents specific features
from being used. For instance, android:onClick, used by View, can be dangerous when
used from within apps widgets. By using a restricted Context to inflate apps widgets,
widgets providers are prevented from using android:onClick.

2 files changed, 23 insertions, 0 deletions

diff --git a/core/java/android/content/Context.java b/core/java/android/content/Context.java
index b0396f6..9e37ae4 100644
--- a/core/java/android/content/Context.java
+++ b/core/java/android/content/Context.java
@@ -1654,6 +1654,13 @@ public abstract class Context {
      * with extreme care!
      */
     public static final int CONTEXT_IGNORE_SECURITY = 0x00000002;
+    
+    /**
+     * Flag for use with {@link #createPackageContext}: a restricted context may
+     * disable specific features. For instance, a View associated with a restricted
+     * context would ignore particular XML attributes.
+     */
+    public static final int CONTEXT_RESTRICTED = 0x00000004;
 
     /**
      * Return a new Context object for the given application name.  This
@@ -1682,4 +1689,15 @@ public abstract class Context {
      */
     public abstract Context createPackageContext(String packageName,
             int flags) throws PackageManager.NameNotFoundException;
+
+    /**
+     * Indicates whether this Context is restricted.
+     * 
+     * @return True if this Context is restricted, false otherwise.
+     * 
+     * @see #CONTEXT_RESTRICTED
+     */
+    public boolean isRestricted() {
+        return false;
+    }
 }
diff --git a/core/java/android/content/ContextWrapper.java b/core/java/android/content/ContextWrapper.java
index 7513b3b..45a082a 100644
--- a/core/java/android/content/ContextWrapper.java
+++ b/core/java/android/content/ContextWrapper.java
@@ -430,4 +430,9 @@ public class ContextWrapper extends Context {
         throws PackageManager.NameNotFoundException {
         return mBase.createPackageContext(packageName, flags);
     }
+
+    @Override
+    public boolean isRestricted() {
+        return mBase.isRestricted();
+    }
 }