自定义view圆加属性动画

从左上到右下
第一步自定义view

package views;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.RectF;
import android.support.annotation.Nullable;
import android.util.AttributeSet;
import android.view.View;

/**
 * Created by wangyajie on 2017/10/25.
 */

public class ViewYuan extends View {
    private Context context;
    private int rimWitdth=10;//宽

    public ViewYuan(Context context) {
        super(context);
    }
    public ViewYuan(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
        this.context=context;
    }
    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        Paint rimPrint=new Paint();//画笔
        RectF rectF=new RectF(5,5,50,50);//
        rimPrint.setAntiAlias(true);
        //        rimPrint.setStyle(Paint.Style.STROKE);//空心圆
        rimPrint.setStyle(Paint.Style.FILL);//实心圆
        rimPrint.setStrokeWidth(rimWitdth);
        rimPrint.setColor(Color.RED);//圆的颜色
        canvas.drawArc(rectF,360,360,false,rimPrint);
    }
}

第二步引用到布局中
我的是由点击事件开始的

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              android:orientation="vertical">

    <Button
        android:id="@+id/btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="开始动画"/>

    <views.ViewYuan
        android:id="@+id/view"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>
</LinearLayout>

第三步使用属性动画

package fragments;

import android.animation.TypeEvaluator;
import android.animation.ValueAnimator;
import android.graphics.PointF;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.LinearInterpolator;
import android.widget.Button;
import views.ViewYuan;

/**
 * Created by wangyajie on 2017/10/25.
 */

public class F2 extends Fragment {

    private View view;
    Button btn;
    ViewYuan viewYuan;
    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        view = inflater.inflate(R.layout.f2, null, false);
        //初始化控件
        initView();
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //初始化数据
                initData();
            }
        });

        return view;
    }

    /**
     * 获取数据
     */
    private void initData() {
        final ValueAnimator animator=new ValueAnimator();
        animator.setDuration(3000);
        animator.setObjectValues(new PointF(1,1));
        animator.setInterpolator(new LinearInterpolator());
        animator.setEvaluator(new TypeEvaluator() {
            @Override
            public Object evaluate(float v, Object o, Object t1) {
                PointF point=new PointF();
                point.x=200*v*3;
                point.y=0.56f*200*(v*3)*(v*3);
                return point;
            }
        });
        animator.start();
        animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator valueAnimator) {
                PointF point= (PointF) animator.getAnimatedValue();
                viewYuan.setX(point.x);
                viewYuan.setY(point.y);
            }
        });
    }
    /**
     * 获取控件
     */
    private void initView(){
        viewYuan= (ViewYuan) view.findViewById(R.id.view);
        btn= view.findViewById(R.id.btn);
    }
}