圆+扇形+三角形+动画=(抽奖轮盘)

Mainactivity 里面是 小圆的动画

package mlb.bawei.com.d04_test01;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.view.animation.RotateAnimation;

import java.io.File;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        float[] angles = new float[]{30,30,30,30,30,30,30,30,30,30,30,30};
        final CustomBingView customBingView = findViewById(R.id.bing);
        customBingView.setmAngles(angles);
        customBingView.invalidate();

        CustomInseideCircle inseideCircle = findViewById(R.id.inside);
        int width = inseideCircle.getWidth();
        int height = inseideCircle.getHeight();

        inseideCircle.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                double random = Math.random()*1000;
                float degrees = (float) random+720+7200;

                RotateAnimation rotateAnimation = new RotateAnimation(
                        0,degrees,250,350
                );
                rotateAnimation.setDuration(5000);
                rotateAnimation.setFillAfter(true);
                customBingView.startAnimation(rotateAnimation);
            }
        });


    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {


        return super.onTouchEvent(event);
    }
}

画扇形图 的view

package mlb.bawei.com.d04_test01;

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

/**
 * @author
 * @date 2018/11/29
 */
public class CustomBingView extends View {

    private Paint mPaint;
    private RectF mRectF;
    float[] mAngles ;/*= new float[]{
            60,60,60,60,60,60
    };*/

    public void setmAngles(float[] mAngles) {
        this.mAngles = mAngles;
    }

    public CustomBingView(Context context) {
        super(context);
        init();
    }

    public CustomBingView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }
    private void init() {
        mPaint = new Paint();
        //
        mPaint.setColor(Color.RED);
        //
        mPaint.setStyle(Paint.Style.FILL);
        //m
        mPaint.setStrokeWidth(5);
        //设置上下左右位置
        mRectF = new RectF();

        mRectF.top = 200;
        mRectF.bottom = 500;
        mRectF.right = 400;
        mRectF.left = 100;
    }
    float mStartAngle =0;
    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);

        for(int i = 0; i  <  mAngles.length; i++){

            if(i % 2 == 0 ){
                //角标为双数时，设置画笔颜色为蓝色
                mPaint.setColor(Color.YELLOW);
            }else{
                //角标为单数时，设置画笔颜色为绿色
                mPaint.setColor(Color.GREEN);
            }
            //画扇形
            //第一个参数，位置信息
            //第二个参数，起始角度
            //第三个参数，从起始角度开始，顺时针旋转角度
            //第四个参数，是否延申到圆心
            //第五个参数，画笔
            canvas.drawArc(mRectF, mStartAngle, mAngles[i], true, mPaint);
            //下一个扇形的起始角度 = 本次扇形起始角度 + 本次扇形旋转角度
            mStartAngle += mAngles[i];
        }
    }
}

画圆的view 以及 画三角形 的五行代码

package mlb.bawei.com.d04_test01;

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

/**
 * @author
 * @date 2018/11/29
 */
public class CustomCircle extends View {

    private Paint mPaint;
    private RectF rectF;

    public CustomCircle(Context context) {
        super(context);
        init();
    }

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

    private void init() {
        mPaint = new Paint();
        //
        mPaint.setColor(Color.RED);
        //
        mPaint.setStyle(Paint.Style.FILL);
        //m
        mPaint.setStrokeWidth(5);
    }

    @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        //这是画圆
        //canvas.drawCircle(250,350,150,mPaint);
        //这是画一个三角形
    }
}