android - MyLinearLayout.getDrawingCache()提供了NullPointerException

编辑：
别客气，这样就行了

TopRatedPage.setDrawingCacheEnabled(true);
TopRatedPage.measure(MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED), MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
TopRatedPage.layout(0, 0, TopRatedPage.getMeasuredWidth(), TopRatedPage.getMeasuredHeight());
TopRatedPage.buildDrawingCache(true);
Bitmap screenshot = Bitmap.createBitmap(TopRatedPage.getDrawingCache());
TopRatedPage.setDrawingCacheEnabled(false);

旧的：
我正试着从布局中截取一张截图，就像这样。

LinearLayout TopRatedPage = (LinearLayout)inflater.inflate(R.layout.toprated, null);
...
Bitmap screenshot;
TopRatedPage.setDrawingCacheEnabled(true);
screenshot = Bitmap.createBitmap(TopRatedPage.getDrawingCache()); // Caused by: java.lang.NullPointerException
TopRatedPage.setDrawingCacheEnabled(false);

你知道我做错了什么吗？
谢谢！
编辑：
也尝试过这样做，它不会抛出错误，而是给出一个空位图。

Bitmap screenshot = TopRatedPage.getDrawingCache();

最佳答案

试试这个让我知道发生了什么…

LinearLayout TopRatedPage = (LinearLayout)inflater.inflate(R.layout.toprated, null);
Bitmap screenshot = Bitmap.createBitmap(LinearLayout .getWidth(), LinearLayout .getHeight(), Bitmap.Config.ARGB_8888);
Canvas c = new Canvas(screenshot);
LinearLayout.draw(c);
imageView.setImageBitmap(screenshot);

如果可能的话，使用，

View captureView = null;
captureView = inflater.inflate(R.layout.toprated, null);
Bitmap screenshot = Bitmap.createBitmap(captureView.getWidth(), captureView.getHeight(), Bitmap.Config.ARGB_8888);
Canvas c = new Canvas(screenshot);
captureView .draw(c);
imageView.setImageBitmap(screenshot);

关于android - MyLinearLayout.getDrawingCache()提供了NullPointerException，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/10278717/