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我试图imageview从drawable中获取并调整它的大小我当前的代码正在所有设备上运行,除了在oppo设备上它在crop()方法内崩溃

我遇到的崩溃位于crop()方法的第一行,您可以在下面找到

Caused by: java.lang.NullPointerException: 

我当前的代码是:

public Bitmap getTileBitmap(int id, int size) {
    String string = tileUrls.get(id);
    if (string.contains(Themes.URI_DRAWABLE)) {
        String drawableResourceName = string.substring(Themes.URI_DRAWABLE.length());
        int drawableResourceId = Shared.context.getResources().getIdentifier(drawableResourceName, "drawable", Shared.context.getPackageName());
        Bitmap bitmap = Utils.scaleDown(drawableResourceId, size, size);
        return Utils.crop(bitmap, size, size);

    }
    return null;
}


public static Bitmap crop(Bitmap source, int newHeight, int newWidth) {
    int sourceWidth = source.getWidth();
    int sourceHeight = source.getHeight();
    float xScale = (float) newWidth / sourceWidth;
    float yScale = (float) newHeight / sourceHeight;
    float scale = Math.max(xScale, yScale);
    float scaledWidth = scale * sourceWidth;
    float scaledHeight = scale * sourceHeight;
    float left = (newWidth - scaledWidth) / 2;
    float top = (newHeight - scaledHeight) / 2;
    RectF targetRect = new RectF(left, top, left + scaledWidth, top + scaledHeight);
    Bitmap dest = Bitmap.createBitmap(newWidth, newHeight, source.getConfig());
    Canvas canvas = new Canvas(dest);
    canvas.drawBitmap(source, null, targetRect, null);

    return dest;
}

编辑:添加了可能导致问题的缩放方法

public static Bitmap scaleDown(int resource, int reqWidth, int reqHeight) {
    BitmapFactory.Options options = new BitmapFactory.Options();
    options.inJustDecodeBounds = true;
    BitmapFactory.decodeResource(Shared.context.getResources(), resource);

    // Calculate inSampleSize
    options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);

    // Decode bitmap with inSampleSize set
    options.inJustDecodeBounds = false;
    return BitmapFactory.decodeResource(Shared.context.getResources(), resource, options);
}

到目前为止,我不确定仅在 oppo 设备上导致崩溃的原因

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1 回答 1

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尝试这个:

options.inJustDecodeBounds = true;
options.inScaled = false;
options.inDensity = 0;
options.inMutable = true; //API 11. Pass to canvas? Might crash without this.
//Load the image here... BitmapFactory.decodeResource()...

... //Some calculations.

options.inJustDecodeBounds = false;
options.inPreferredConfig = Bitmap.Config.ARGB_8888;
于 2021-02-09T06:23:15.923 回答