How to animate a slide in notification view that pushes the content view down

This worked for me

First you must import this library: http://nineoldandroids.com/

The import is done by importing existing android project into your workspace, afterwards right click your Poject -> Properties -> Android. Here you will see a library section, click the Add button and add the nineoldandroids library.

First off, here is the layout xml used for this to work:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/parentLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity" >

<FrameLayout
    android:id="@+id/frameLayout"
    android:layout_width="match_parent"
    android:layout_height="0dp"
    android:layout_weight="1" >

    <ListView
        android:id="@+id/listView1"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@android:color/transparent"
        android:divider="@android:color/transparent"
        android:fastScrollEnabled="false"
        android:listSelector="@android:color/transparent"
        android:scrollbars="vertical"
        android:smoothScrollbar="true" />

    <View
        android:id="@+id/greenView"
        android:layout_width="match_parent"
        android:layout_height="150dp"
        android:background="#ff00ff00"
        android:alpha="0"/>
</FrameLayout>

<LinearLayout
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="horizontal" >

    <Button
        android:id="@+id/animate"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="clickHandler"
        android:text="animate" />

    <Button
        android:id="@+id/close"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="clickHandler"
        android:text="close" />
</LinearLayout>

Notice: Both the ListView and the green View could be layouts of any types with any kind of content.

And next a proof of concept Activity.

public class TestActivity extends Activity {

private View greenView;
private ListView listView;
private int greenHeight;

private boolean isShowingBox;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_test);

    // The animated view 
    greenView = (View)findViewById(R.id.greenView);
    listView = (ListView)findViewById(R.id.listView1);


    // Instanciating an array list (you don't need to do this, you already have yours)
    ArrayList<String> your_array_list = new ArrayList<String>();
    your_array_list.add("1");
    your_array_list.add("2");
    your_array_list.add("3");
    your_array_list.add("4");
    your_array_list.add("5");
    your_array_list.add("6");
    your_array_list.add("7");
    your_array_list.add("8");
    your_array_list.add("9");
    your_array_list.add("10");
    your_array_list.add("11");
    your_array_list.add("12");
    your_array_list.add("13");
    your_array_list.add("14");
    your_array_list.add("15");
    // This is the array adapter, it takes the context of the activity as a first // parameter, the type of list view as a second parameter and your array as a third parameter
    ArrayAdapter<String> arrayAdapter =      
    new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1, your_array_list);
    listView.setAdapter(arrayAdapter);

    final LinearLayout layout = (LinearLayout)findViewById(R.id.parentLayout);

       final ViewTreeObserver vto = layout.getViewTreeObserver();
        vto.addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
            @Override
            public void onGlobalLayout() {

                if (Build.VERSION.SDK_INT < 16) {
                    layout.getViewTreeObserver().removeGlobalOnLayoutListener(this);
                } else {
                    layout.getViewTreeObserver().removeOnGlobalLayoutListener(this);
                }

                greenHeight = greenView.getHeight();

            }
        });
}

public void clickHandler(View v) {
    if (isShowingBox) {
        isShowingBox = false;
        slideOut(1500, 0);
    } else {
        isShowingBox = true;
        slideIn(1500, 0);
    }
}

private void slideIn(int duration, int delay) { 
    AnimatorSet set = new AnimatorSet();
    set.playTogether(
        // animate from off-screen in to screen 
        ObjectAnimator.ofFloat(greenView, "translationY",  -greenHeight, 0),
        ObjectAnimator.ofFloat(listView, "translationY",  0, greenHeight),
        ObjectAnimator.ofFloat(greenView, "alpha", 0, 0.25f, 1)
        // add other animations if you wish
    );
    set.setStartDelay(delay);
    set.setDuration(duration).start();
}

private void slideOut(int duration, int delay) {
    AnimatorSet set = new AnimatorSet();
    set.playTogether(
        // animate from on-screen and out
        ObjectAnimator.ofFloat(greenView, "translationY", 0, -greenHeight),
        ObjectAnimator.ofFloat(listView, "translationY", greenHeight, 0),
        ObjectAnimator.ofFloat(greenView, "alpha", 1, 1, 1)
        // add other animations if you wish
    );
    set.setStartDelay(delay);
    set.setDuration(duration).start();
}

}

Important note: Remember to import the AnimatorSet and ObjectAnimator from nineoldandroids in your class and not the Android SDK ones!!!