Android studio android studio的打印活动

我想用一个按钮直接打印我的布局活动，我不知道是否需要将活动直接转换为PDF格式进行打印

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谢谢

要以图像形式获取活动的根视图，请执行以下操作：

    View view = getWindow().getDecorView().findViewById(android.R.id.content);
    view.setDrawingCacheEnabled(true);
    view.measure(View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED),View. MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));
    view.layout(0, 0, view.getMeasuredWidth(), view.getMeasuredHeight());
    view.buildDrawingCache(true);
    Bitmap bitmap = Bitmap.createBitmap(view.getDrawingCache());
    view.setDrawingCacheEnabled(false);

及列印：

PrintHelper photoPrinter = new PrintHelper(this); // Asume that 'this' is your activity
photoPrinter.setScaleMode(PrintHelper.SCALE_MODE_FIT);
photoPrinter.printBitmap("print", bitmap);

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我有下一个问题，A/Bitmap:Error，无法在此处访问无效/空闲的位图！