NineOldAndroids animation not working on API>10

I am using NineOldAndroid library to perform animations. The animations work fine for API<=10. But for API>10 the app force closes. This is my code:

import static com.nineoldandroids.view.ViewPropertyAnimator.animate;
import android.content.Intent;
import android.graphics.Canvas;
import android.graphics.PixelFormat;
import android.os.Build;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.view.ViewTreeObserver.OnGlobalLayoutListener;
import android.view.WindowManager;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import android.widget.TextView;

import com.actionbarsherlock.app.ActionBar;
import com.actionbarsherlock.view.MenuItem;
import com.nineoldandroids.animation.Animator;
import com.nineoldandroids.animation.Animator.AnimatorListener;
import com.nineoldandroids.animation.ObjectAnimator;

public class ActivityActualMain extends SherlockActivity  {
    LinearLayout container1, container2;
    RelativeLayout viewTree;
    ImageView image, image1, image2;
    TextView tv, tv1, tv2, tv3, tv4;
    ObjectAnimator anim;



@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    final int duration = 2000;
    setContentView(R.layout.activity_actual_main);

    ActionBar bar = getSupportActionBar();
    bar.setDisplayHomeAsUpEnabled(true);
    bar.setBackgroundDrawable(getResources().getDrawable(
            R.drawable.red_actionbar));
    viewTree = (RelativeLayout) findViewById(R.id.viewTree);
    container1 = (LinearLayout) findViewById(R.id.linearLayout1);
    container2 = (LinearLayout) findViewById(R.id.linearLayout2);
    image = (ImageView) findViewById(R.id.imageView1);
    image1 = (ImageView) findViewById(R.id.imageView2);
    image2 = (ImageView) findViewById(R.id.imageView3);
    tv = (TextView) findViewById(R.id.text_tech_des);

    viewTree.getViewTreeObserver().addOnGlobalLayoutListener(//to check if the layout has been placed in activity
            new OnGlobalLayoutListener() {
                public void onGlobalLayout() {
                    if (Build.VERSION.SDK_INT < 16) {
                        viewTree.getViewTreeObserver().removeGlobalOnLayoutListener(this);}
                    else{
                        viewTree.getViewTreeObserver()
                        .removeOnGlobalLayoutListener(this);
                    }

                    anim = ObjectAnimator.ofFloat(image, "y", 0f,
                            image.getTop());

                    anim.addListener(new AnimatorListener() {

                        @Override
                        public void onAnimationStart(Animator arg0) {
                            // TODO Auto-generated method stub
                            ObjectAnimator.ofFloat(tv, "alpha", 1, 0, 1)
                                    .setDuration(duration).start();//line no 82
                            ObjectAnimator.ofFloat(container1, "x", 0f,
                                    container1.getLeft()).setDuration(1000).start();
                            ObjectAnimator.ofFloat(container2, "x", 0f,
                                    container2.getLeft()).setDuration(1000).start();
                        }

                        @Override
                        public void onAnimationRepeat(Animator arg0) {
                            // TODO Auto-generated method stub

                        }

                        @Override
                        public void onAnimationEnd(Animator arg0) {
                            // TODO Auto-generated method stub
                        }

                        @Override
                        public void onAnimationCancel(Animator arg0) {
                            // TODO Auto-generated method stub

                        }
                    });
                    anim.setDuration(duration).start();//line no 106
                }
            });

}
}

This is my stack trace:

    10-26 19:23:15.203: E/AndroidRuntime(21541): FATAL EXCEPTION: main
10-26 19:23:15.203: E/AndroidRuntime(21541): java.lang.NullPointerException
10-26 19:23:15.203: E/AndroidRuntime(21541):    at com.nineoldandroids.animation.PropertyValuesHolder.setupSetterAndGetter(PropertyValuesHolder.java:523)
10-26 19:23:15.203: E/AndroidRuntime(21541):    at com.nineoldandroids.animation.ObjectAnimator.initAnimation(ObjectAnimator.java:410)
10-26 19:23:15.203: E/AndroidRuntime(21541):    at com.nineoldandroids.animation.ValueAnimator.setCurrentPlayTime(ValueAnimator.java:538)
10-26 19:23:15.203: E/AndroidRuntime(21541):    at com.nineoldandroids.animation.ValueAnimator.start(ValueAnimator.java:928)
10-26 19:23:15.203: E/AndroidRuntime(21541):    at com.nineoldandroids.animation.ValueAnimator.start(ValueAnimator.java:951)
10-26 19:23:15.203: E/AndroidRuntime(21541):    at com.nineoldandroids.animation.ObjectAnimator.start(ObjectAnimator.java:385)
10-26 19:23:15.203: E/AndroidRuntime(21541):    at com.vishalaksh.technex.ActivityActualMain$2$1.onAnimationStart(ActivityActualMain.java:82)
10-26 19:23:15.203: E/AndroidRuntime(21541):    at com.nineoldandroids.animation.ValueAnimator.start(ValueAnimator.java:937)
10-26 19:23:15.203: E/AndroidRuntime(21541):    at com.nineoldandroids.animation.ValueAnimator.start(ValueAnimator.java:951)
10-26 19:23:15.203: E/AndroidRuntime(21541):    at com.nineoldandroids.animation.ObjectAnimator.start(ObjectAnimator.java:385)
10-26 19:23:15.203: E/AndroidRuntime(21541):    at com.vishalaksh.technex.ActivityActualMain$2.onGlobalLayout(ActivityActualMain.java:106)
10-26 19:23:15.203: E/AndroidRuntime(21541):    at android.view.ViewTreeObserver.dispatchOnGlobalLayout(ViewTreeObserver.java:808)
10-26 19:23:15.203: E/AndroidRuntime(21541):    at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1768)
10-26 19:23:15.203: E/AndroidRuntime(21541):    at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1004)
10-26 19:23:15.203: E/AndroidRuntime(21541):    at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5481)
10-26 19:23:15.203: E/AndroidRuntime(21541):    at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749)
10-26 19:23:15.203: E/AndroidRuntime(21541):    at android.view.Choreographer.doCallbacks(Choreographer.java:562)
10-26 19:23:15.203: E/AndroidRuntime(21541):    at android.view.Choreographer.doFrame(Choreographer.java:532)
10-26 19:23:15.203: E/AndroidRuntime(21541):    at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735)
10-26 19:23:15.203: E/AndroidRuntime(21541):    at android.os.Handler.handleCallback(Handler.java:730)
10-26 19:23:15.203: E/AndroidRuntime(21541):    at android.os.Handler.dispatchMessage(Handler.java:92)
10-26 19:23:15.203: E/AndroidRuntime(21541):    at android.os.Looper.loop(Looper.java:137)
10-26 19:23:15.203: E/AndroidRuntime(21541):    at android.app.ActivityThread.main(ActivityThread.java:5103)
10-26 19:23:15.203: E/AndroidRuntime(21541):    at java.lang.reflect.Method.invokeNative(Native Method)
10-26 19:23:15.203: E/AndroidRuntime(21541):    at java.lang.reflect.Method.invoke(Method.java:525)
10-26 19:23:15.203: E/AndroidRuntime(21541):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
10-26 19:23:15.203: E/AndroidRuntime(21541):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
10-26 19:23:15.203: E/AndroidRuntime(21541):    at dalvik.system.NativeStart.main(Native Method)

I had an issue with this library on devices API < 10, which gave the same stacktrace. Given i was using the source code of NineOldAndroids i decided to investigate the problem inside the library.

After some tests i noticed that this error occurs because the lib tries to invoke some methods that doesn't exists on the view (since its an old API level). Searching a bit more i found the AnimatorProxy class which has a static method called "wrap". This method is used to encapsulate View objects in older Android versions emulating the presence of some animation methods as such setScaleX/Y, setTransalationX/Y.

To fix the problem i had to open the ObjectAnimator class and search for all occurrences of this line (In my library code i found 4 occurrences):

mTarget = target;

Inside that class i created the following method:

private void setTarget(Object obj) {
    if (Build.VERSION.SDK_INT < Build.VERSION_CODES.HONEYCOMB && obj instanceof View) {
        mTarget = AnimatorProxy.wrap((View) obj);
    } else {
        mTarget = obj;
    }
}

And replaced the line above with: