将图像裁剪为正方形-Android [英] Crop image to square - Android

问题描述

如何从左右切割矩形图像(600 x 300)以适合正方形ImageView?我不想调整图像大小，只想将其裁剪为300 x 300.

How can I cut rectangular image (600 x 300) from left and right to fit in square ImageView ? I don't want to resize image, I just want to crop it, to be 300 x 300.

[解决方案]

如@blackbelt所说

As @blackbelt said

Bitmap cropImg = Bitmap.createBitmap(src, startX, startY, dstWidth, dstHeight);

非常适合裁剪图像.因此，如何自动裁剪具有不同尺寸的图像.我为此创建了以下简单代码:

is great for cropping images. So how can you automatically crop images with different sizes. I create this simple code for that:

// From drawable
Bitmap src= BitmapFactory.decodeResource(context.getResources(), R.drawable.image);

// From URL
Bitmap src = null;
try {
    String URL = "http://www.example.com/image.jpg";
    InputStream in = new java.net.URL(URL).openStream();
    src = BitmapFactory.decodeStream(in);
} catch (Exception e) {
    e.printStackTrace();
}

int width = src.getWidth();
int height = src.getHeight();
int crop = (width - height) / 2;
Bitmap cropImg = Bitmap.createBitmap(src, crop, 0, height, height);

ImageView.setImageBitmap(cropImg);

推荐答案

您可以使用

Bitmap dst = Bitmap.createBitmap(src, startX, startY, dstWidth, dstHeight);

来自文档:

从源的指定子集中返回一个不变的位图 位图.新的位图可能与源是同一对象，或者可能是副本 已制成.初始化的密度与 原始位图.

Returns an immutable bitmap from the specified subset of the source bitmap. The new bitmap may be the same object as source, or a copy may have been made. It is initialized with the same density as the original bitmap.

此处，您可以找到文档

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