Android以编程方式加载drawable并调整其大小

问题描述

如何从InputStream(资产，文件系统)加载drawable并根据屏幕分辨率hdpi，mdpi或ldpi动态调整其大小?

How can I load drawable from InputStream (assets, file system) and resize it dynamically based on the screen resolution hdpi, mdpi or ldpi?

原始图像为hdpi，我只需要调整mdpi和ldpi的大小即可.

The original image is in hdpi, I only need resizing for mdpi and ldpi.

Android如何在/res中动态调整可绘制对象的大小?

How does Android do dynamic resizing of the drawables in /res?

推荐答案

找到了它:

  /**
   * Loads image from file system.
   *
   * @param context the application context
   * @param filename the filename of the image
   * @param originalDensity the density of the image, it will be automatically
   * resized to the device density
   * @return image drawable or null if the image is not found or IO error occurs
   */
  public static Drawable loadImageFromFilesystem(Context context, String filename, int originalDensity) {
    Drawable drawable = null;
    InputStream is = null;

    // set options to resize the image
    Options opts = new BitmapFactory.Options();
    opts.inDensity = originalDensity;

    try {
      is = context.openFileInput(filename);
      drawable = Drawable.createFromResourceStream(context.getResources(), null, is, filename, opts);
    } catch (Exception e) {
      // handle
    } finally {
      if (is != null) {
        try {
          is.close();
        } catch (Exception e1) {
          // log
        }
      }
    }
    return drawable;
  }

像这样使用:

loadImageFromFilesystem(context, filename, DisplayMetrics.DENSITY_MEDIUM);

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