安卓自定义View画球加上动画抛物线和垂直

1.首先新建一个类继承View重写方法

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.view.View;


public class Animotor extends View {
    public Animotor(Context context) {
        super(context);
    }

    public Animotor(Context context,  AttributeSet attrs) {
        super(context, attrs);


    }

    public Animotor(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }



    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);

        // 对于画笔
        Paint paint = new Paint();
        // 设置抗锯齿
        paint.setAntiAlias(true);
        // 设置画笔颜色
        paint.setColor(Color.RED);
        // 三种样式
        paint.setStyle(Paint.Style.FILL_AND_STROKE);
        paint.setStrokeWidth(5);
        // 阴影
        paint.setShadowLayer(10, 0, 0, Color.CYAN);
        //画圆
        canvas.drawCircle(100, 100, 100, paint);
    }

}

2.在布局引用

<com.example.zzrk2019221.Animotor
    android:layout_width="match_parent"
    android:layout_height="0dp"
    android:id="@+id/animotion"
    android:layout_weight="9"
    />
<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="0dp"
    android:orientation="horizontal"
    android:layout_weight="1"
    >
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/but1"
        android:text="垂直"
        />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/but2"
        android:text="抛物线"
        />
3.在Activity里获取控件

package com.example.zzrk2019221;

import android.animation.TypeEvaluator;
import android.animation.ValueAnimator;
import android.graphics.PointF;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.animation.LinearInterpolator;
import android.widget.Button;

public class Main2Activity extends AppCompatActivity {

    private Animotor animotors;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);

        animotors = findViewById(R.id.animotion);

        Button but1 = findViewById(R.id.but1);

        Button but2 = findViewById(R.id.but2);
        but1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                verticalRun(animotors);
            }
        });

        but2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                paowuxian(animotors);
            }
        });


    }

    /**
     * 自由落体
     *
     * @param view
     */
    public void verticalRun(View view) {
        ValueAnimator animator = ValueAnimator.ofFloat(0,animotors.getHeight());
        animator.setTarget(animotors);
        animator.setDuration(1000).start();
//		animator.setInterpolator(value)
        animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator animation) {
                animotors.setTranslationY((Float) animation.getAnimatedValue());
            }
        });

    }


    /**
     * 抛物线
     * @param view
     */
    public void paowuxian(View view)
    {

        ValueAnimator valueAnimator = new ValueAnimator();
        valueAnimator.setDuration(3000);
        valueAnimator.setObjectValues(new PointF(0, 0));
        valueAnimator.setInterpolator(new LinearInterpolator());
        valueAnimator.setEvaluator(new TypeEvaluator<PointF>()
        {
            // fraction = t / duration
            @Override
            public PointF evaluate(float fraction, PointF startValue,
                                   PointF endValue)
            {
                Log.e("zzz", fraction * 3 + "");
                // x方向200px/s ，则y方向0.5 * 10 * t
                PointF point = new PointF();
                point.x = 200 * fraction * 3;
                point.y = 0.5f * 200 * (fraction * 3) * (fraction * 3);
                return point;
            }
        });

        valueAnimator.start();
        valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener()
        {
            @Override
            public void onAnimationUpdate(ValueAnimator animation)
            {
                PointF point = (PointF) animation.getAnimatedValue();
                animotors.setX(point.x);
                animotors.setY(point.y);

            }
        });
    }


}