如何以显示图像的一部分？ [英] How to display a part of an image?

问题描述

我有一个大的图像。但我必须要显示它只是一些部分。如何采用Android ImageView的是这可能吗？

I have a large image. But i have to display just some portion of it. How is this possible using Android ImageView?

推荐答案

您总是可以裁剪如果您通过 Bitmap.createBitmap（）静态方法所需要的片，和然后将其分配给视图：

You could always crop the piece that you need via the Bitmap.createBitmap() static method, and then assign it to the view:

喜欢的东西...

// Set some constants
private static final Bitmap SOURCE_BITMAP = BitmapFactory.decodeFile(....); // Get the source Bitmap using your favorite method :-)
private static final int START_X = 10;
private static final int START_Y = 15;
private static final int WIDTH_PX = 100;
private static final int HEIGHT_PX = 100;

// Crop bitmap
Bitmap newBitmap = Bitmap.createBitmap(SOURCE_BITMAP, START_X, START_Y, WIDTH_PX, HEIGHT_PX, null, false);

// Assign new bitmap to ImageView
ImageView image = (ImageView)findViewById(R.id.image_view);
image.setImageBitmap(newBitmap);

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