是否有可能采取视图的截图，没有显示的看法？ [英] Is it possible to take a screenshot of a view, without showing the view?

问题描述

短的问题：

假设我有某种布局文件和我它充气（或使用code正常的构建函数）。

Suppose I have some kind of a layout file and I inflate it (or use the normal CTORs in code).

而不是显示膨胀的观点，我想采取截屏它会是什么样子下（给定的宽度和放大器;高度，甚至比屏幕大）一些限制（位图）。

Instead of showing the inflated view, I wish to take a "screenshot" (a bitmap) of how it would look like under some limitations (of given width&height, even larger than the screen).

我不希望将视图添加到在屏幕任意位置，但只持有它用于此目的，也许以后添加它。

I do not wish to add the view to anywhere on the screen, but only hold it for this purpose and maybe add it later.

这样的事情可能是，如何把东西容易操作非常有用。例如，我可以使用该图像将里面放一个布局，以便它周围有一个框架。

Such a thing could be useful for easy manipulations of how to place things. For example, I could use a layout that an image would be put inside it so that it would have a frame around it.

这种事可能吗？如果是这样，怎么样？

Is such a thing possible? If so, How?

推荐答案

好吧，我已经找到了一种可能的方式做到这一点的基础上的 此链接 ：

OK, I've found a possible way to do it, based on this link :

  public static Bitmap drawToBitmap(Context context,final int layoutResId,final int width,final int height)
    {
    final Bitmap bmp=Bitmap.createBitmap(width,height,Bitmap.Config.ARGB_8888);
    final Canvas canvas=new Canvas(bmp);
    final LayoutInflater inflater=(LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    final View layout=inflater.inflate(layoutResId,null);
    layout.setDrawingCacheEnabled(true);        layout.measure(MeasureSpec.makeMeasureSpec(canvas.getWidth(),MeasureSpec.EXACTLY),MeasureSpec.makeMeasureSpec(canvas.getHeight(),MeasureSpec.EXACTLY));
    layout.layout(0,0,layout.getMeasuredWidth(),layout.getMeasuredHeight());
    canvas.drawBitmap(layout.getDrawingCache(),0,0,new Paint());
    return bmp;
    }

使用示例：

public class MainActivity extends ActionBarActivity
  {
  @Override
  protected void onCreate(final Bundle savedInstanceState)
    {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    final ImageView iv=(ImageView)findViewById(R.id.image);
    final DisplayMetrics metrics=getResources().getDisplayMetrics();
    final Bitmap b=drawToBitmap(this,R.layout.test,metrics.widthPixels,metrics.heightPixels);
    iv.setImageBitmap(b);
    }

  }

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