如何从现有位图创建更大的位图

发布于 2025-01-04 05:24:37 字数 264 浏览 3 评论 0原文

我有一张位图图像。如何以编程方式创建更大的位图？我尝试创建scaleBitMap，但它没有显示更大。

int newHeight=900;
Bitmap bg1=Bitmap.createScaledBitmap(bg, width, newHeight, false);
canvas.drawBitmap(bg1, null, new Rect(0, 0, getWidth(), newHeight), null);

我该如何解决这个问题？

原文

I have one Bitmap image. How do I create a bigger bitmap programmatically? I tried creating scaleBitMap, but it is not displaying bigger.

int newHeight=900;
Bitmap bg1=Bitmap.createScaledBitmap(bg, width, newHeight, false);
canvas.drawBitmap(bg1, null, new Rect(0, 0, getWidth(), newHeight), null);

How do I fix this problem?

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疯到世界奔溃 2025-01-11 05:24:37

也许你应该尝试这个：

int newHeight=900;
int newWidth= bg.getWidth;
Bitmap bg1=Bitmap.createScaledBitmap(bg, newWidth, newHeight, true);

总是值得一试

Maybe you should try this instead:

int newHeight=900;
int newWidth= bg.getWidth;
Bitmap bg1=Bitmap.createScaledBitmap(bg, newWidth, newHeight, true);

always worth a try

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春夜浅 2025-01-11 05:24:37

private Bitmap resizeBitmap(Bitmap bitmap, float scaleHeight, float scaleWidth)
{
    int width = bitmap.getWidth();
    int height = bitmap.getHeight();

    int newWidth = (int)(width * scaleWidth);
    int newHeight = (int)(height * scaleHeight);

    return Bitmap.createScaledBitmap(bitmap, newWidth, newHeight, true);
}

private Bitmap resizeBitmap(Bitmap bitmap, float scaleHeight, float scaleWidth)
{
    int width = bitmap.getWidth();
    int height = bitmap.getHeight();

    int newWidth = (int)(width * scaleWidth);
    int newHeight = (int)(height * scaleHeight);

    return Bitmap.createScaledBitmap(bitmap, newWidth, newHeight, true);
}

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雄赳赳气昂昂 2025-01-11 05:24:37

Bitmap.createScaledBitmap() 正在执行您想要的操作，问题是当您尝试将其绘制到画布上时。 getWidth() 返回什么？将其余代码发布给我们一些背景信息，我们可以找到您的问题。

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唠甜嗑 2025-01-11 05:24:37

尝试这个代码...

public Bitmap getResizeBitmap(Bitmap bitmap, int newHeight, int newWidth)
        {

            int width = bitmap.getWidth();
            int height = bitmap.getHeight();

            float scaleWidth = ((float)newWidth)/width;
            float scaleHeight = ((float)newHeight)/height;

            Matrix matrix = new Matrix();
            matrix.postScale(scaleWidth, scaleHeight);
            Bitmap resizeBitmap = Bitmap.createBitmap(bm, 0, 0, width, height, matrix, true);

            return resizeBitmap;

        }

然后在 onCreate 方法中使用这个...

myImage = Bitmap.createBitmap(BitmapFactory
                    .decodeResource(this.getResources(), R.drawable.mypic));

            myImage.setDensity(1);

            imageview = (ImageView)findViewById(R.id.imageViewId);
            imageview.setImageBitmap(getResizeBitmap(myImage,195, 480));//as per as your requirement

Try this code...

public Bitmap getResizeBitmap(Bitmap bitmap, int newHeight, int newWidth)
        {

            int width = bitmap.getWidth();
            int height = bitmap.getHeight();

            float scaleWidth = ((float)newWidth)/width;
            float scaleHeight = ((float)newHeight)/height;

            Matrix matrix = new Matrix();
            matrix.postScale(scaleWidth, scaleHeight);
            Bitmap resizeBitmap = Bitmap.createBitmap(bm, 0, 0, width, height, matrix, true);

            return resizeBitmap;

        }

then in onCreate method use this...

myImage = Bitmap.createBitmap(BitmapFactory
                    .decodeResource(this.getResources(), R.drawable.mypic));

            myImage.setDensity(1);

            imageview = (ImageView)findViewById(R.id.imageViewId);
            imageview.setImageBitmap(getResizeBitmap(myImage,195, 480));//as per as your requirement

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