import master.flame.danmaku.danmaku.model.android.AndroidDisplayer; //导入依赖的package包/类
private IDrawTask createTask(boolean useDrwaingCache, DanmakuTimer timer, Context context,
        int width, int height, IDrawTask.TaskListener taskListener) {
    mDisp = new AndroidDisplayer();
    mDisp.setSize(width, height);
    DisplayMetrics displayMetrics = context.getResources().getDisplayMetrics();
    mDisp.setDensities(displayMetrics.density, displayMetrics.densityDpi,
            displayMetrics.scaledDensity);
    mDisp.resetSlopPixel(DanmakuGlobalConfig.DEFAULT.scaleTextSize);
    obtainMessage(NOTIFY_DISP_SIZE_CHANGED, false).sendToTarget();
    
    IDrawTask task = useDrwaingCache ? new CacheManagingDrawTask(timer, context, mDisp,
            taskListener, 1024 * 1024 * AndroidUtils.getMemoryClass(context) / 3)
            : new DrawTask(timer, context, mDisp, taskListener);
    task.setParser(mParser);
    task.prepare();
    return task;
}