Android 自定义View实现大风车

先看一眼效果(它是可以转动的风车):

主类:

package com.example.windmill_fengche;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;

public class MainActivity extends AppCompatActivity {

    private myview view_id;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
        view_id.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                //实现风车的旋转效果
                Animation animation = AnimationUtils.loadAnimation(MainActivity.this, R.anim.anim_rotate);
                view_id.startAnimation(animation);

            }
        });
    }

    private void initView() {
        view_id = (myview) findViewById(R.id.view_id);
    }
}

自定义myview:

package com.example.windmill_fengche;

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

public class myview extends View {
    public myview(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
    }

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

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

        //画笔
        Paint paint=new Paint();
        paint.setStyle(Paint.Style.FILL);
        paint.setStrokeWidth(5);

        //画风车
        paint.setColor(Color.RED);
        canvas.drawLine(200,100,200,200,paint);
        canvas.drawLine(300,100,200,200,paint);
        canvas.drawLine(200,100,300,100,paint);

        paint.setColor(Color.GREEN);
        canvas.drawLine(200,200,300,200,paint);
        canvas.drawLine(200,200,300,300,paint);
        canvas.drawLine(300,200,300,300,paint);

        paint.setColor(Color.BLUE);
        canvas.drawLine(200,200,100,300,paint);
        canvas.drawLine(200,200,200,300,paint);
        canvas.drawLine(100,300,200,300,paint);

        paint.setColor(Color.YELLOW);
        canvas.drawLine(100,100,100,200,paint);
        canvas.drawLine(100,100,200,200,paint);
        canvas.drawLine(100,200,200,200,paint);

        paint.setColor(Color.BLACK);
        canvas.drawCircle(200,200,5,paint);
    }
}

anim_rotate:

lalalala~