Android為TV端助力:自訂view之太陽

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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;

/**
 * 自訂燈光選擇View
 *
 * @author Chuwe1
 */
public class LightView extends SurfaceView implements SurfaceHolder.Callback, Runnable {

    // 預設半徑
    private static final int DEFAULT_RADIUS = 170;

    private SurfaceHolder mHolder;
    private Canvas mCanvas;
    private boolean flag;
    /**
     * 當前進度
     */
    private int mCurrentCount = 0;

    // 圓和刻度的畫筆
    private Paint mPaint;
    // 指標畫筆
    private Paint mPointerPaint;

    // 畫布的寬高
    private int mCanvasWidth, mCanvasHeight;
    // 時鐘半徑
    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); // 消除鋸齒
        mPaint.setStrokeWidth(10); // 設定圓環的寬度
        mPaint.setStrokeCap(Paint.Cap.ROUND); // 定義線段斷電形狀為圓頭
        mPaint.setAntiAlias(true); // 消除鋸齒



        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是為了設定預設的2px的內邊距，因為繪製時鐘的圓的畫筆設定的寬度是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;
        }
    });


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

                mPaint.setColor(Color.WHITE);
                //將座標系原點移至去除內邊距後的畫布中心
                mCanvas.translate(mCanvasWidth * 1.0f / 2 + getPaddingLeft() - getPaddingRight(),
                        mCanvasHeight * 1.0f / 2 + getPaddingTop() - getPaddingBottom());
                //繪製圓盤
                mCanvas.drawCircle(0, 0, mRadius-30, mPaint);
                mPaint.setColor(Color.WHITE);
                //繪製時刻度
                for (int i = 0; i < 10; i++) {
                    mCanvas.drawLine(0, mRadius, 0, mRadius - 10, mPaint);
                    mCanvas.rotate(36);
                }
                mPaint.setColor(Color.parseColor("#FEF37A"));
                //繪製時刻度
                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);
    }

  
}

Android為TV端助力:自訂view之太陽