在不使用ImageIO的情況下在Java中調整圖像大小

Question

我們已經通過獲取JPEG縮略圖數據成功調整了圖像的大小，但是某些圖像沒有圖像。

解決方案只是調整圖像大小以能夠創建縮略圖，但只能使用Java 1.4及以下版本（因此，由於設備不支持ImageIO，因此我無法使用ImageIO）

我如何使用ImageIO調整圖像大小是否有解決方案？

Answer 1

java.awt.Image.getScaledInstance(width, height, hints)返回Image的新的縮放實例。

最后一個參數hints更改了使用的縮放方法，這將修改結果的外觀。 請參見下面的摘錄，直接從JDK來源獲取。

 /**
 * Use the default image-scaling algorithm.
 * @since JDK1.1
 */
public static final int SCALE_DEFAULT = 1;

/**
 * Choose an image-scaling algorithm that gives higher priority
 * to scaling speed than smoothness of the scaled image.
 * @since JDK1.1
 */
public static final int SCALE_FAST = 2;

/**
 * Choose an image-scaling algorithm that gives higher priority
 * to image smoothness than scaling speed.
 * @since JDK1.1
 */
public static final int SCALE_SMOOTH = 4;

/**
 * Use the image scaling algorithm embodied in the
 * <code>ReplicateScaleFilter</code> class.
 * The <code>Image</code> object is free to substitute a different filter
 * that performs the same algorithm yet integrates more efficiently
 * into the imaging infrastructure supplied by the toolkit.
 * @see        java.awt.image.ReplicateScaleFilter
 * @since      JDK1.1
 */
public static final int SCALE_REPLICATE = 8;

/**
 * Use the Area Averaging image scaling algorithm.  The
 * image object is free to substitute a different filter that
 * performs the same algorithm yet integrates more efficiently
 * into the image infrastructure supplied by the toolkit.
 * @see java.awt.image.AreaAveragingScaleFilter
 * @since JDK1.1
 */
public static final int SCALE_AREA_AVERAGING = 16;

Answer 2

嘗試使用此代碼，只需在寬度和高度上輸入所需的大小，即可獲得所需的圖像。 到目前為止，我發現的最短代碼。 對我來說很好。

    Bitmap yourBitmap;
    Bitmap resized = Bitmap.createScaledBitmap(yourBitmap, newWidth, newHeight, true);