Android Bitmap相关

一、获取View快照

方法1、已绘制到Window的View

    public static Bitmap getBitmapFromView(View view) {
        Bitmap bitmap = null;
        //开启view缓存bitmap
        view.setDrawingCacheEnabled(true);
        //设置view缓存Bitmap质量
        view.setDrawingCacheQuality(View.DRAWING_CACHE_QUALITY_HIGH);
        //获取缓存的bitmap
        Bitmap cache = view.getDrawingCache();
        if (cache != null && !cache.isRecycled()) {
            bitmap = Bitmap.createBitmap(cache);
        }
        //销毁view缓存bitmap
        view.destroyDrawingCache();
        //关闭view缓存bitmap
        view.setDrawingCacheEnabled(false);
        return bitmap;
    }

方法2、任意View，如 getBitmapFromView(LayoutInflater.from(context).inflate(R.layout.test, null), 0xFFFFFFFF)

    /**
     * 获取未依附到window的View的快照
     *
     * @param view    View
     * @param bgColor 画布背景色
     * @return Bitmap
     */
    public static Bitmap getBitmapFromView(View view, int bgColor) {
        if (view == null) {
            return null;
        }
        int viewWidth = view.getWidth();
        int viewHeight = view.getHeight();
        if (viewWidth == 0 && viewHeight == 0) {
            int widthSpec = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);
            int heightSpec = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);
            view.measure(widthSpec, heightSpec);
            viewWidth = view.getMeasuredWidth();
            viewHeight = view.getMeasuredHeight();
            view.layout(0, 0, viewWidth, viewHeight);
        }
        Bitmap screenshot = Bitmap.createBitmap(viewWidth, viewHeight, Bitmap.Config.ARGB_8888);
        Canvas c = new Canvas(screenshot);
        c.drawColor(bgColor);
        view.draw(c);
        return screenshot;
    }

持续更新中...