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> What is a memory leak?
  Some objects have a limited lifetime. When their job is done, they are expected to be garbage collected. If a chain of references holds an object in memory after the end of its expected lifetime, this creates a memory leak. When these leaks accumulate, the app runs out of memory.

  For instance, after Activity.onDestroy() is called, the activity, its view hierarchy and their associated bitmaps should all be garbage collectable. If a thread running in the background holds a reference to the activity, then the corresponding memory cannot be reclaimed. This eventually leads to an OutOfMemoryError crash.

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    * December 2009: Android 2.0.1
    */
     public static final int ECLAIR_0_1 = 6;


    /**
    * January 2010: Android 2.1
    */
    public static final int ECLAIR_MR1 = 7;

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        mCallback = cb;
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    public final void setCallback(Callback cb) {
        mCallback = new WeakReference<Callback>(cb);
    }

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    // Don't change/rename without updating FaceDetector_jni.cpp
    private final int mNativeBitmap;

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