Android为TV端助力:自定义view之太阳

先看效果图

package com.hhzt.iptv.lvb_w8.view;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.PixelFormat;
import android.graphics.PorterDuff;
import android.os.Handler;
import android.os.Message;
import android.util.AttributeSet;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;

/**
 * 自定义灯光选择View
 *
 * @author Chuwe1
 */
public class LightView extends SurfaceView implements SurfaceHolder.Callback, Runnable {

    // 默认半径
    private static final int DEFAULT_RADIUS = 170;

    private SurfaceHolder mHolder;
    private Canvas mCanvas;
    private boolean flag;
    /**
     * 当前进度
     */
    private int mCurrentCount = 0;

    // 圆和刻度的画笔
    private Paint mPaint;
    // 指针画笔
    private Paint mPointerPaint;

    // 画布的宽高
    private int mCanvasWidth, mCanvasHeight;
    // 时钟半径
    private int mRadius = DEFAULT_RADIUS;

    public LightView(Context context) {
        this(context, null);
    }

    public LightView(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

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

        mHolder = getHolder();
        mHolder.addCallback(this);

        mPaint = new Paint();
        mPointerPaint = new Paint();

        mPaint.setColor(Color.WHITE);
        mPaint.setAntiAlias(true); // 消除锯齿
        mPaint.setStrokeWidth(10); // 设置圆环的宽度
        mPaint.setStrokeCap(Paint.Cap.ROUND); // 定义线段断电形状为圆头
        mPaint.setAntiAlias(true); // 消除锯齿

        mPointerPaint.setColor(Color.BLACK);
        mPointerPaint.setAntiAlias(true);
        mPointerPaint.setStyle(Paint.Style.FILL_AND_STROKE);
        mPointerPaint.setTextSize(22);
        mPointerPaint.setTextAlign(Paint.Align.CENTER);

        setZOrderOnTop(true);
        getHolder().setFormat(PixelFormat.TRANSLUCENT);

        setFocusable(true);
        setFocusableInTouchMode(true);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);

        int widthSize = MeasureSpec.getSize(widthMeasureSpec);
        int widthMode = MeasureSpec.getMode(widthMeasureSpec);
        int heightSize = MeasureSpec.getSize(heightMeasureSpec);
        int heightMode = MeasureSpec.getMode(heightMeasureSpec);

        int desiredWidth, desiredHeight;
        if (widthMode == MeasureSpec.EXACTLY) {
            desiredWidth = widthSize;
        } else {
            desiredWidth = mRadius * 2 + getPaddingLeft() + getPaddingRight();
            if (widthMode == MeasureSpec.AT_MOST) {
                desiredWidth = Math.min(widthSize, desiredWidth);
            }
        }

        if (heightMode == MeasureSpec.EXACTLY) {
            desiredHeight = heightSize;
        } else {
            desiredHeight = mRadius * 2 + getPaddingTop() + getPaddingBottom();
            if (heightMode == MeasureSpec.AT_MOST) {
                desiredHeight = Math.min(heightSize, desiredHeight);
            }
        }

        // +4是为了设置默认的2px的内边距，因为绘制时钟的圆的画笔设置的宽度是2px
        setMeasuredDimension(mCanvasWidth = desiredWidth + 20, mCanvasHeight = desiredHeight + 20);

        mRadius = (int) (Math.min(desiredWidth - getPaddingLeft() - getPaddingRight(),
                desiredHeight - getPaddingTop() - getPaddingBottom()) * 1.0f / 2);
    }

    @Override
    public void surfaceCreated(SurfaceHolder holder) {
        flag = true;
        new Thread(this).start();
    }

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {
        flag = false;
    }

    @Override
    public void run() {
        draw();
    }

    private Handler handler = new Handler(new Handler.Callback() {
        @Override
        public boolean handleMessage(Message msg) {
            return false;
        }
    });

    /**
     * 绘制
     */
    private void draw() {
        try {
            mCanvas = mHolder.lockCanvas();
            if (mCanvas != null) {
                //去掉背景颜色，使其透明
                mCanvas.drawColor(Color.TRANSPARENT, PorterDuff.Mode.CLEAR);

                mPaint.setColor(Color.WHITE);
                //将坐标系原点移至去除内边距后的画布中心
                mCanvas.translate(mCanvasWidth * 1.0f / 2 + getPaddingLeft() - getPaddingRight(),
                        mCanvasHeight * 1.0f / 2 + getPaddingTop() - getPaddingBottom());
                //绘制圆盘
                mCanvas.drawCircle(0, 0, mRadius-30, mPaint);
                mPaint.setColor(Color.WHITE);
                //绘制时刻度
                for (int i = 0; i < 10; i++) {
                    mCanvas.drawLine(0, mRadius, 0, mRadius - 10, mPaint);
                    mCanvas.rotate(36);
                }
                mPaint.setColor(Color.parseColor("#FEF37A"));
                //绘制时刻度
                for (int i = 0; i < mCurrentCount; i++) {
                    mCanvas.drawLine(0, -mRadius, 0, -(mRadius - 10), mPaint);
                    mCanvas.rotate(36);
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (mCanvas != null) {
                mHolder.unlockCanvasAndPost(mCanvas);
            }
        }
    }

    public void setCurrentCount(int count){
        this.mCurrentCount = count;
        invalidate();
    }

    @Override
    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
        super.onLayout(changed, left, top, right, bottom);
        this.setBackgroundColor(Color.TRANSPARENT);
    }

}