Merge "Reduce footprint of Signature from ~7000 to ~1448" into gingerbread

core/java/android/content/pm/Signature.java

@@ -20,6 +20,7 @@ import android.content.ComponentName;
 import android.os.Parcel;
 import android.os.Parcelable;
 
+import java.lang.ref.SoftReference;
 import java.util.Arrays;
 
 /**
@@ -30,7 +31,7 @@ public class Signature implements Parcelable {
     private final byte[] mSignature;
     private int mHashCode;
     private boolean mHaveHashCode;
-    private String mString;
+    private SoftReference<String> mStringRef;
 
     /**
      * Create Signature from an existing raw byte array.
@@ -96,10 +97,13 @@ public class Signature implements Parcelable {
      * cached so future calls will return the same String.
      */
     public String toCharsString() {
-        if (mString != null) return mString;
-        String str = new String(toChars());
-        mString = str;
-        return mString;
+        String str = mStringRef == null ? null : mStringRef.get();
+        if (str != null) {
+            return str;
+        }
+        str = new String(toChars());
+        mStringRef = new SoftReference<String>(str);
+        return str;
     }
 
     /**