Merge "AbsListView: add option to disable scrolling cache (1/2)" into…

… gingerbread
zsol · Feb 1, 2012 · 46c5c8e · 46c5c8e
2 parents 5b46273 + ad7b631
commit 46c5c8e
Showing 1 changed file with 28 additions and 2 deletions.
diff --git a/core/java/android/widget/AbsListView.java b/core/java/android/widget/AbsListView.java
@@ -29,6 +29,7 @@
 import android.os.Handler;
 import android.os.Parcel;
 import android.os.Parcelable;
+import android.os.SystemProperties;
 import android.text.Editable;
 import android.text.TextUtils;
 import android.text.TextWatcher;
@@ -329,6 +330,15 @@ public abstract class AbsListView extends AdapterView<ListAdapter> implements Te
      */
     boolean mStackFromBottom;
 
+    /**
+     * Indicates whether to system-wide-override to enable/disable or not.
+     * 0 = force to enable scrollingCacheEnabled regardless of app setting
+     * 1 = default is to enable scrollingCacheEnabled unless app specifies
+     * 2 = default is to disable scrollingCacheEnabled unless app specifies
+     * 3 = force to disable scrollingCacheEnabled regardless of app setting
+     */
+    int mScrollingCacheProperty = SystemProperties.getInt("persist.sys.scrollingcache",1);
+
     /**
      * When set to true, the list automatically discards the children's
      * bitmap cache after scrolling.
@@ -618,7 +628,21 @@ public AbsListView(Context context, AttributeSet attrs, int defStyle) {
         boolean stackFromBottom = a.getBoolean(R.styleable.AbsListView_stackFromBottom, false);
         setStackFromBottom(stackFromBottom);
 
-        boolean scrollingCacheEnabled = a.getBoolean(R.styleable.AbsListView_scrollingCache, true);
+        boolean scrollingCacheEnabled = true;
+        switch(mScrollingCacheProperty) {
+        case 0:
+            scrollingCacheEnabled = true;
+            break;
+        default:
+            scrollingCacheEnabled = a.getBoolean(R.styleable.AbsListView_scrollingCache, true);
+            break;
+        case 2:
+            scrollingCacheEnabled = a.getBoolean(R.styleable.AbsListView_scrollingCache, false);
+            break;
+        case 3:
+            scrollingCacheEnabled = false;
+            break;
+        }
         setScrollingCacheEnabled(scrollingCacheEnabled);
 
         boolean useTextFilter = a.getBoolean(R.styleable.AbsListView_textFilterEnabled, false);
@@ -646,7 +670,8 @@ private void initAbsListView() {
         setFocusableInTouchMode(true);
         setWillNotDraw(false);
         setAlwaysDrawnWithCacheEnabled(false);
-        setScrollingCacheEnabled(true);
+        boolean scrollingCacheEnabled = (mScrollingCacheProperty < 2);
+        setScrollingCacheEnabled(scrollingCacheEnabled);
 
         final ViewConfiguration configuration = ViewConfiguration.get(mContext);
         mTouchSlop = configuration.getScaledTouchSlop();
@@ -817,6 +842,7 @@ public void setScrollingCacheEnabled(boolean enabled) {
             clearScrollingCache();
         }
         mScrollingCacheEnabled = enabled;
+        Log.d(ViewDebug.CONSISTENCY_LOG_TAG, "AbsListView " + this + " enabled= " + enabled);
     }
 
     /**