android - 如何剪切图像的某些部分并在imageview中显示

问题描述

我只想在 imageview 中显示图像的一部分.见下图.

I want to show only some part of image in imageview. See following image .

在 google+ 应用中可以找到相同的示例，您可以在其中看到所有带有图片的帖子.

Same example can be found in google+ app where you see all posts with images.

任何链接，代码都会有所帮助.谢谢

Any links ,code will be helpful. Thanks

推荐答案

使用这段代码

int width = bitmapOrg.width();
int height = bitmapOrg.height();
int newWidth = 200;
int newHeight = 200;

// calculate the scale - in this case = 0.4f
float scaleWidth = ((float) newWidth) / width;
float scaleHeight = ((float) newHeight) / height;

// createa matrix for the manipulation
Matrix matrix = new Matrix();
// resize the bit map
matrix.postScale(scaleWidth, scaleHeight);

// recreate the new Bitmap
Bitmap resizedBitmap = Bitmap.createBitmap(bitmapOrg, 0, 0, 
                  width, height, matrix, true); 

// make a Drawable from Bitmap to allow to set the BitMap 
// to the ImageView, ImageButton or what ever
BitmapDrawable bmd = new BitmapDrawable(resizedBitmap);

ImageView imageView = new ImageView(this);

// set the Drawable on the ImageView
imageView.setImageDrawable(bmd);

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