属性动画，绘制一个圆，进行垂直平移

效果 

创建一个类

ClaView

package com.example.zklx2;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.view.View;
//继承View 得到前三个方法
public class ClaView extends View {

    Paint paint;
    Context context;
    //定义宽高
    public int width = 0,height = 0;

    public ClaView(Context context) {
        super(context);
    }

    public ClaView(Context context,AttributeSet attrs) {
        super(context, attrs);
        //画笔
        paint = new Paint();
        //设置画笔颜色
        paint.setColor(Color.RED);
    }

    public ClaView(Context context,AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }
    //绘制图形
    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        //画布，画一个圆
        canvas.drawCircle(width/2,100,100,paint);
    }
    //测量
    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        // 获取测量视图度
        width=getMeasuredWidth();
        // 获取测量视图高度
        height=getMeasuredHeight();
    }
}

XML布局

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <com.example.zklx2.ClaView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/view"/>

</android.support.constraint.ConstraintLayout>

ManiActivity主页面

package com.example.zklx2;

import android.animation.Animator;
import android.animation.ObjectAnimator;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

public class MainActivity extends AppCompatActivity {

    private ClaView view;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //得到id控件
        view = findViewById(R.id.view);
        //属性动画
        ObjectAnimator objectAnimator = ObjectAnimator.ofFloat(view,"translationY",0,500);
        //设置动画维持时间3秒
        objectAnimator.setDuration(3000).start();
        //添加监听器
        objectAnimator.addListener(new Animator.AnimatorListener() {
            @Override
            public void onAnimationStart(Animator animation) {

            }

            @Override
            public void onAnimationEnd(Animator animation) {
                //动画执行完 跳转Main2Activity
                startActivity(new Intent(MainActivity.this,Main2Activity.class));
            }

            @Override
            public void onAnimationCancel(Animator animation) {

            }

            @Override
            public void onAnimationRepeat(Animator animation) {

            }
        });
    }
}