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);    }

}

原文地址：https://www.cnblogs.com/xiaoxiaing/p/9052918.html