自定义的动画

public class MainActivity extends AppCompatActivity {
    private Circle c;

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

         c = (Circle) findViewById(R.id.circle);
     
        ObjectAnimator transkationY = ObjectAnimator.ofFloat(c,"translationY", -300, 300f);
        ObjectAnimator transkationX = ObjectAnimator.ofFloat(c,"translationX", 0, 0f);
     
        ObjectAnimator ra = ObjectAnimator.ofFloat(c,"rotationY", 0f, 360f);

        AnimatorSet animatorSet = new AnimatorSet();
     
        animatorSet.play(transkationY).with(transkationX).with(ra);
        animatorSet.setDuration(3000);
        ra.setDuration(3000);
        ra.start();
        animatorSet.start();
        //动画的监听
        animatorSet.addListener(new Animator.AnimatorListener() {
            @Override
            public void onAnimationStart(Animator animator) {

            }

            @Override
            public void onAnimationEnd(Animator animator) {
               
                Intent intent = new Intent(MainActivity.this, Main2Activity.class);
                startActivity(intent);
            }

            @Override
            public void onAnimationCancel(Animator animator) {

            }

            @Override
            public void onAnimationRepeat(Animator animator) {

            }
        });
    }
}
//自定义
public class Circle extends View {
    public Circle(Context context) {
        super(context);
    }

    public Circle(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
    }

    public Circle(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }
    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        Paint p = new Paint();
        p.setColor(getResources().getColor(R.color.colorPrimary));
        p.setStrokeWidth(20);
        canvas.drawCircle(canvas.getWidth() / 2, canvas.getHeight() / 2, 50, p);
    }
}