Android的负载绘制编程并调整其大小 [英] Android load drawable programatically and resize it

问题描述

我如何可以加载从绘制的InputStream（资产，文件系统），并动态地调整其大小根据屏幕分辨率华电国际，MDPI和LDPI？

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

原始图像是华电国际，我只需要调整大小为MDPI和LDPI。

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

有谁知道机器人是如何做的可绘制的动态调整中/ RES？

Does anyone know how Android does dynamic resizing of the drawables in /res?

推荐答案

发现：

  /**
   * 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 (Throwable e) {
      // handle
    } finally {
      if (is != null) {
        try {
          is.close();
        } catch (Throwable e1) {
          // ingore
        }
      }
    }
    return drawable;
  }

使用这样的：

loadImageFromFilesystem(context, filename, DisplayMetrics.DENSITY_MEDIUM);

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