自定义view+属性动画实现

实现思路:继承view,实现有参构造方法,重写onDraw方法绘制用的,在onDraw方法里创建画笔,可在在构造方法里实现初始画笔.
这里有实现思路
1.自定义view

public class Circle extends View {

    //重写3个构造方法
    public Circle(Context context) {
        super(context);
    }

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

    public Circle(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }
    //开始绘制小圆
    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        //创建画笔
        Paint p=new Paint();
        //设置颜色
        p.setColor(getResources().getColor(R.color.colorPrimary));
        //设置空心线宽
        p.setStrokeWidth(20);
        //绘制
        canvas.drawCircle(canvas.getWidth()/2,canvas.getHeight()/2,50,p);
    }
}

2.布局文件添加自定控件

    <com.bwei.mytext.view.Circle
        android:id="@+id/cicle"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

3.实现属性动画和自定义动画的结合效果

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //自定义的view
        Circle c= (Circle) findViewById(R.id.cicle);
        //设置属性动画效果
        ObjectAnimator transkationY = ObjectAnimator.ofFloat(c,"translationY", 0, 600f);
        ObjectAnimator transkationX = ObjectAnimator.ofFloat(c,"translationX", 0, 600f);
        //控制动画效果
        AnimatorSet animatorSet = new AnimatorSet();
        animatorSet.play(transkationY).with(transkationX);
        //持续时间
        animatorSet.setDuration(3000);
        //开始
        animatorSet.start();
        //动画的监听
        animatorSet.addListener(new Animator.AnimatorListener() {
            //开始
            @Override
            public void onAnimationStart(Animator animator) {

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

            }
            //重复
            @Override
            public void onAnimationRepeat(Animator animator) {

            }
        });
    }
}

最后的效果图