Full example of how to programmatically do RotateAnimations?

I want to have an animation with various steps that do moves (translations) and rotations like "straight on, turn left, straight on, ...." of a car.

I am able to do this in an AnimationSet, but fail at rotating around the center of my car image with the "RELATIVE_TO_SELF" setting. I know about

Animation a = new RotateAnimation(0,90,Animation.RELATIVE_TO_SELF,0.5f,... )

for this purpose. Still the rotation occurs around the upper left corner of the screen (or canvas?).

Currently I am solving this by manually keeping track of the position after each animation step, but this is suboptimal.

I suspect that my initial layout setup is bogus:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:layout_width="fill_parent"
              android:layout_height="fill_parent"
              android:orientation="vertical"
>
    <FrameLayout
            android:layout_height="wrap_content"
            android:layout_width="fill_parent">

        <!-- view that draws some background -->
        <de.bsd.turtlecar.SampleView android:id="@+id/graph_view"
              android:layout_height="350px"
              android:layout_width="fill_parent"
              android:visibility="invisible"
              />

        <!-- the car -->
        <ImageView android:id="@+id/car_view"
                   android:src="@drawable/turtle_car"
                   android:layout_height="wrap_content"
                   android:layout_width="wrap_content"
                   android:visibility="invisible"/>


    </FrameLayout>

   <Button ... onCl开发者_如何学Pythonick="run" ... />
</LinearLayout>

This shows the car in the upper left corner (should show up in a different place -- basically where the animation later starts. And it should be move later).

In my code that is triggered through the run button I do:

    ImageView carView = (ImageView) findViewById(R.id.car_view);
    print(carView);
    AnimationSet animationSet = new AnimationSet(true);

    TranslateAnimation a = new TranslateAnimation(
            Animation.ABSOLUTE,200, Animation.ABSOLUTE,200,
            Animation.ABSOLUTE,200, Animation.ABSOLUTE,200);
    a.setDuration(1000);
    animationSet.addAnimation(a);

    RotateAnimation r = new RotateAnimation(0f, -90f,200,200); // HERE 
    r.setStartOffset(1000);
    r.setDuration(1000);
    animationSet.addAnimation(r);
    ...

So at the point with here, the rotation works, but I have to keep track. if I rotate RELATIVE_TO_SELF, the rotation happens around (0,0) of the screen.

Additional question: what can I do in order to keep the car on screen after the animation has finished?

Or am I completely on the wrong track?

Try adding setFillAfter(true) to your Animations. That will certainly keep the car in its final place and it may solve your rotation point problems too

 TranslateAnimation a = new TranslateAnimation(
        Animation.ABSOLUTE,200, Animation.ABSOLUTE,200,
        Animation.ABSOLUTE,200, Animation.ABSOLUTE,200);
a.setDuration(1000);
a.setFillAfter(true); //HERE
animationSet.addAnimation(a);

RotateAnimation r = new RotateAnimation(0f, -90f,200,200); // HERE 
r.setStartOffset(1000);
r.setDuration(1000);
r.setFillAfter(true); //HERE
animationSet.addAnimation(r);
...