属性动画(蓝球下移)

public class MyView extends View{    private int color;    private float radius;    private Paint paint;    public MyView(Context context) {        this(context,null);    }    public MyView(Context context, @Nullable AttributeSet attrs) {        super(context, attrs);        init(context,attrs);    }    private void init(Context  context,AttributeSet attrs){        TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.MyView);        color = typedArray.getColor(R.styleable.MyView_MyViewColor, Color.BLUE);        radius = typedArray.getDimension(R.styleable.MyView_MyViewRadius,30);        typedArray.recycle();        paint = new Paint();        paint.setAntiAlias(true);        paint.setStrokeWidth(2);        paint.setColor(color);        paint.setStyle(Paint.Style.FILL);    }    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        canvas.drawCircle(30f,30f,radius,paint);    }}
public class WelcomeActivity extends AppCompatActivity {    private MyView mv;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_welcome);        initView();        startAnim();    }    private void initView(){        mv = (MyView)findViewById(R.id.mv);    }    private void startAnim(){        ObjectAnimator translationX = new ObjectAnimator().ofFloat(mv,"translationX",0,650f);        ObjectAnimator translationY = new ObjectAnimator().ofFloat(mv,"translationY",0,1000f);        AnimatorSet animatorSet = new AnimatorSet();        animatorSet.playTogether(translationX,translationY);        animatorSet.setDuration(3000);        animatorSet.start();        Timer timer = new Timer();        timer.schedule(new TimerTask() {            @Override            public void run() {                Intent intent = new Intent(WelcomeActivity.this,MainActivity.class);                startActivity(intent);            }        },3000);    }}
<?xml version="1.0" encoding="utf-8"?><resources>    <declare-styleable name="MyView">        <attr name="MyViewColor" format="color"></attr>        <attr name="MyViewRadius" format="dimension"></attr>    </declare-styleable></resources>